id stringlengths 36 36 | document stringlengths 3 3k | metadata stringlengths 23 69 | embeddings listlengths 384 384 |
|---|---|---|---|
1afaf798-7351-4f38-9f65-bc488f0368a6 | enqueue_time
(
Nullable(DateTime64(6))
) β Time when job became ready and was enqueued into a ready queue of it's pool. Null if the job is not ready yet.
start_time
(
Nullable(DateTime64(6))
) β Time when worker dequeues the job from ready queue and start its execution. Null if the job is not started yet.
finish_... | {"source_file": "asynchronous_loader.md"} | [
-0.09162558615207672,
0.008824552409350872,
-0.0678156241774559,
0.0040550935082137585,
0.020398687571287155,
-0.06767697632312775,
0.00411585159599781,
-0.0462116114795208,
-0.01655346341431141,
0.03950510546565056,
0.04055515304207802,
-0.04880814254283905,
-0.023524224758148193,
-0.0174... |
76d27589-59f9-420e-8278-e9e1973e7aa3 | Time instants during job lifetime:
-
schedule_time
(
DateTime64
) - Time when job was created and scheduled to be executed (usually with all its dependencies).
-
enqueue_time
(
Nullable(DateTime64)
) - Time when job became ready and was enqueued into a ready queue of its pool. Null if the job is not ready yet.
-
s... | {"source_file": "asynchronous_loader.md"} | [
-0.08704002946615219,
0.02808348834514618,
-0.09206841140985489,
0.02027767151594162,
0.04437294602394104,
-0.05534139275550842,
-0.011470003984868526,
-0.027634814381599426,
-0.021864917129278183,
0.025106176733970642,
0.04073704034090042,
-0.022424748167395592,
-0.04868317022919655,
-0.0... |
14fd4477-c342-43fe-a786-d277de20d9c3 | description: 'System table containing a list of database engines supported by the
server.'
keywords: ['system table', 'database_engines']
slug: /operations/system-tables/database_engines
title: 'system.database_engines'
doc_type: 'reference'
Contains the list of database engines supported by the server.
This ta... | {"source_file": "database_engines.md"} | [
0.00010564980038907379,
-0.02555144764482975,
-0.07695493847131729,
0.04281222075223923,
-0.0251948069781065,
-0.04526526853442192,
0.057218775153160095,
0.03899485990405083,
-0.09499279409646988,
-0.01883123628795147,
-0.007184572052210569,
-0.0041830874979496,
0.04527275636792183,
-0.097... |
c46832d3-099f-4f29-868d-a42fc1c0674c | description: 'System table containing information about quotas.'
keywords: ['system table', 'quotas', 'quota']
slug: /operations/system-tables/quotas
title: 'system.quotas'
doc_type: 'reference'
system.quotas
Contains information about
quotas
.
Columns:
-
name
(
String
) β Quota name.
-
id
(
UUID
) β Quota... | {"source_file": "quotas.md"} | [
-0.022692658007144928,
-0.017096608877182007,
-0.12410169094800949,
-0.01780274137854576,
-0.08922266960144043,
-0.05669461935758591,
0.1108204796910286,
0.032379359006881714,
0.023476403206586838,
0.007118111476302147,
0.04100106284022331,
-0.03826097026467323,
0.11210372298955917,
-0.046... |
48c3a4fc-26e5-41f5-80a8-19aa383995f5 | description: 'System table containing information about detached parts of MergeTree
tables'
keywords: ['system table', 'detached_parts']
slug: /operations/system-tables/detached_parts
title: 'system.detached_parts'
doc_type: 'reference'
Contains information about detached parts of
MergeTree
tables. The
reason
... | {"source_file": "detached_parts.md"} | [
0.008692466653883457,
-0.018379146233201027,
0.027301624417304993,
0.0014808897394686937,
0.09268108755350113,
-0.108686663210392,
0.054314129054546356,
0.0609407015144825,
0.005872557405382395,
-0.02072146348655224,
0.05040498822927475,
-0.02041269652545452,
0.008626606315374374,
-0.03939... |
1d723b99-c1da-469d-9219-e6119ac88e49 | description: 'System table containing information about the parameters of the request
to the ZooKeeper server and the response from it.'
keywords: ['system table', 'zookeeper_log']
slug: /operations/system-tables/zookeeper_log
title: 'system.zookeeper_log'
doc_type: 'reference'
system.zookeeper_log
This table c... | {"source_file": "zookeeper_log.md"} | [
0.015793632715940475,
0.045944537967443466,
-0.05159168690443039,
0.03584924712777138,
0.027850616723299026,
-0.12393596023321152,
0.025432011112570763,
0.024709884077310562,
0.01416013203561306,
0.06345882266759872,
-0.010149448178708553,
-0.07788864523172379,
0.0398387610912323,
0.005936... |
8d5c4e1e-ef83-4ebc-9c83-84e8f79cdf0c | request_idx
(
UInt32
) β The number of the request included in multi request (for multi request β
0
, then in order from
1
).
Columns with request response parameters:
zxid
(
Int64
) β ZooKeeper transaction ID. The serial number issued by the ZooKeeper server in response to a successfully executed request (... | {"source_file": "zookeeper_log.md"} | [
-0.03908335790038109,
0.06236523389816284,
-0.06516771018505096,
0.04228386655449867,
0.029577312991023064,
-0.09488677978515625,
0.012972581200301647,
0.026961874216794968,
0.016915110871195793,
0.03314408287405968,
-0.0441342368721962,
-0.035448748618364334,
0.03698018938302994,
0.020145... |
6616b28a-2231-44b5-9d10-34a533b9b54f | Row 2:
ββββββ
type: Response
event_date: 2021-08-09
event_time: 2021-08-09 21:38:30.292086
address: ::
port: 2181
session_id: 106662742089334927
xid: 10858
has_watch: 1
op_num: List
path: /clickhouse/task_queue/ddl
data:
is_eph... | {"source_file": "zookeeper_log.md"} | [
-0.0922476202249527,
0.041610825806856155,
-0.08542279899120331,
0.031046632677316666,
0.0037425816990435123,
-0.11521470546722412,
0.0249163880944252,
-0.02920067124068737,
0.03228551894426346,
0.04039068892598152,
0.000952563772443682,
-0.08552427589893341,
-0.014716299250721931,
-0.0141... |
579e6ddf-87f7-4698-bc27-ead3b3797b5e | description: 'System table containing information about memory allocations done via
jemalloc allocator in different size classes (bins) aggregated from all arenas.'
keywords: ['system table', 'jemalloc_bins']
slug: /operations/system-tables/jemalloc_bins
title: 'system.jemalloc_bins'
doc_type: 'reference'
import ... | {"source_file": "jemalloc_bins.md"} | [
0.1011945977807045,
-0.037539560347795486,
-0.07890132069587708,
0.00004030220225104131,
0.0238653477281332,
-0.05803113430738449,
0.024341993033885956,
0.03299205005168915,
-0.005600361619144678,
0.12786100804805756,
-0.04989004507660866,
0.006754277739673853,
0.05178504437208176,
-0.0695... |
d7c2f21d-6e60-44e3-ae5e-489986704bd9 | description: 'System table containing information about cached DNS records.'
keywords: ['system table', 'dns_cache']
slug: /operations/system-tables/dns_cache
title: 'system.dns_cache'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
Contains information about ca... | {"source_file": "dns_cache.md"} | [
0.011496983468532562,
0.02048197202384472,
-0.04134527966380119,
-0.05318758264183998,
-0.02028515562415123,
-0.11372897773981094,
0.024887774139642715,
-0.03084058314561844,
0.03497185930609703,
0.07953125238418579,
-0.024636412039399147,
-0.005053060594946146,
0.0315670482814312,
-0.1315... |
b1b01a17-acf6-4558-9d04-2a724d2a27d4 | description: 'System table containing information about threads that execute queries,
for example, thread name, thread start time, duration of query processing.'
keywords: ['system table', 'query_thread_log']
slug: /operations/system-tables/query_thread_log
title: 'system.query_thread_log'
doc_type: 'reference'
i... | {"source_file": "query_thread_log.md"} | [
0.023624101653695107,
-0.05471379682421684,
-0.05381530523300171,
0.00403248704969883,
-0.041921231895685196,
-0.10431670397520065,
0.05927727743983269,
-0.09201326221227646,
0.035395439714193344,
0.10828611999750137,
0.005503478460013866,
-0.015222699381411076,
0.07066506147384644,
-0.089... |
78a32082-db92-408c-908a-f3d9d33c08d9 | query_id
(
String
) β ID of the query.
address
(
IPv6
) β IP address that was used to make the query.
port
(
UInt16
) β The client port that was used to make the query.
initial_user
(
String
) β Name of the user who ran the initial query (for distributed query execution).
initial_query_id
(
String
) β ID o... | {"source_file": "query_thread_log.md"} | [
-0.0601053424179554,
0.04693177714943886,
-0.03594056889414787,
0.01262458972632885,
-0.079056516289711,
-0.09972906857728958,
-0.003921130672097206,
-0.017537029460072517,
-0.04325246438384056,
-0.026366515085101128,
-0.01880168728530407,
0.0157233327627182,
0.05900716781616211,
-0.095065... |
46103ad1-58c1-4fd0-9ec6-2e03171253e1 | Example
sql
SELECT * FROM system.query_thread_log LIMIT 1 \G
text
Row 1:
ββββββ
hostname: clickhouse.eu-central1.internal
event_date: 2020-09-11
event_time: 2020-09-11 10:08:17
event_time_microseconds: 2020-09-11 10:08:17.134042
query_start_time: ... | {"source_file": "query_thread_log.md"} | [
0.017156442627310753,
-0.0178409181535244,
-0.06672992557287216,
0.07573823630809784,
-0.05750739574432373,
-0.11177805811166763,
0.04817601665854454,
0.012529972940683365,
0.010871278122067451,
0.054698921740055084,
-0.014540561474859715,
-0.03884830325841904,
0.03169877454638481,
-0.0842... |
650255e3-f9d8-4b9e-80e1-bb1e15dcb4f3 | description: 'System table containing information about merges and part mutations
currently in process for tables in the MergeTree family.'
keywords: ['system table', 'merges']
slug: /operations/system-tables/merges
title: 'system.merges'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_s... | {"source_file": "merges.md"} | [
-0.005658737849444151,
-0.025553982704877853,
-0.04136516526341438,
-0.046152181923389435,
0.025180185213685036,
-0.14549772441387177,
-0.001704837311990559,
0.05230187252163887,
-0.0038878978230059147,
0.0630352795124054,
0.0457281619310379,
-0.009117670357227325,
0.06622499972581863,
-0.... |
d2a1c727-4d33-40e0-afb4-8ce76dfdfdbe | description: 'System table containing a history of memory and metric values from table
system.events
for individual queries, periodically flushed to disk.'
keywords: ['system table', 'query_metric_log']
slug: /operations/system-tables/query_metric_log
title: 'system.query_metric_log'
doc_type: 'reference'
impor... | {"source_file": "query_metric_log.md"} | [
0.041350774466991425,
-0.018907684832811356,
-0.08000187575817108,
0.05427236109972,
-0.020210320129990578,
-0.1159559115767479,
0.04495345056056976,
-0.0047317370772361755,
0.09841753542423248,
0.06846432387828827,
0.0037419272121042013,
0.010428084060549736,
0.07995278388261795,
-0.07816... |
8336bad2-efac-461c-bd89-d762a306928a | description: 'System table containing information about settings of AzureQueue tables.
Available from server version
24.10
.'
keywords: ['system table', 'azure_queue_settings']
slug: /operations/system-tables/azure_queue_settings
title: 'system.azure_queue_settings'
doc_type: 'reference'
Contains information abo... | {"source_file": "azure_queue_settings.md"} | [
-0.017269661650061607,
-0.03548121079802513,
-0.10778015106916428,
0.040830742567777634,
-0.11073397845029831,
0.022441061213612556,
0.10298239439725876,
-0.06510519236326218,
-0.026202231645584106,
0.08696314692497253,
0.009875930845737457,
-0.05753012374043465,
0.08792880922555923,
-0.04... |
1e3beb15-ed6a-4253-9256-e33f0eb9f34a | description: 'System iceberg snapshot history'
keywords: ['system iceberg_history']
slug: /operations/system-tables/iceberg_history
title: 'system.iceberg_history'
doc_type: 'reference'
system.iceberg_history
This system table contain the snapshot history of Iceberg tables existing in ClickHouse. It will be empty... | {"source_file": "iceberg_history.md"} | [
-0.04139731824398041,
-0.0223714467138052,
-0.08149215579032898,
0.0011174922110512853,
0.053907766938209534,
-0.05990244448184967,
-0.044944021850824356,
0.01731172204017639,
-0.019577380269765854,
-0.008081036619842052,
0.04747391864657402,
0.006502453237771988,
0.04724749177694321,
-0.0... |
c613762f-63a1-40e8-8fcd-49f0b4b4ce3b | description: 'System table containing information about stack traces for fatal errors.'
keywords: ['system table', 'crash_log']
slug: /operations/system-tables/crash_log
title: 'system.crash_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
Contains informati... | {"source_file": "crash_log.md"} | [
0.06675341725349426,
-0.070741206407547,
-0.04995076358318329,
-0.037167832255363464,
0.02511223964393139,
-0.0959448590874672,
0.016730360686779022,
0.06914819031953812,
0.01783987507224083,
0.11020269989967346,
0.003861964214593172,
-0.02483116276562214,
0.08285840600728989,
-0.101592697... |
80bd41ec-3154-4b1e-beda-6ce800283eb9 | description: 'System table containing information about all successful and failed
login and logout events.'
keywords: ['system table', 'session_log']
slug: /operations/system-tables/session_log
title: 'system.session_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud... | {"source_file": "session_log.md"} | [
0.0718863233923912,
0.06742938607931137,
-0.06122324615716934,
-0.05367313697934151,
0.02437850460410118,
-0.06703785061836243,
0.08374574035406113,
0.05543516203761101,
0.04649706929922104,
0.05894925817847252,
-0.0006167399697005749,
-0.04391653835773468,
0.13725849986076355,
-0.02641585... |
4cc4cf6a-deb4-4ea9-ace5-1d3908601e47 | failure_reason
(
String
) β The exception message containing the reason for the login/logout failure.
Example
Query:
sql
SELECT * FROM system.session_log LIMIT 1 FORMAT Vertical;
Result:
text
Row 1:
ββββββ
hostname: clickhouse.eu-central1.internal
type: LoginSuccess
auth_i... | {"source_file": "session_log.md"} | [
0.06653565913438797,
0.07454236596822739,
-0.044709231704473495,
-0.011414327658712864,
0.009972714819014072,
-0.04861077666282654,
0.10318988561630249,
0.03760988637804985,
0.019720399752259254,
0.002647374989464879,
-0.006193255539983511,
-0.04742567613720894,
0.06534545868635178,
0.0488... |
f8a8a391-881b-405b-8e9e-0660cd20bccf | description: 'System table containing information about and status of scheduling nodes
residing on the local server.'
keywords: ['system table', 'scheduler']
slug: /operations/system-tables/scheduler
title: 'system.scheduler'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_c... | {"source_file": "scheduler.md"} | [
0.022137636318802834,
0.0031802912708371878,
-0.06009885296225548,
0.06463716924190521,
0.05892356112599373,
-0.07713671028614044,
0.0469449907541275,
-0.0498693585395813,
-0.02949473261833191,
0.11604184657335281,
-0.045109823346138,
-0.016591046005487442,
0.045930925756692886,
-0.0661520... |
44546a04-c4e2-42a4-8f05-e8fe982cae70 | queue_length
(
Nullable(UInt64)
) β For
fifo
nodes only. Current number of resource requests residing in the queue.
queue_cost
(
Nullable(Int64)
) β For fifo nodes only. Sum of costs (e.g. size in bytes) of all requests residing in the queue.
budget
(
Nullable(Int64)
) β For fifo nodes only. The number of avai... | {"source_file": "scheduler.md"} | [
-0.014175071381032467,
0.0120398486033082,
-0.08307715505361557,
0.05573517456650734,
0.036267805844545364,
-0.06987471133470535,
0.041197873651981354,
0.010443359613418579,
0.015073820017278194,
0.11822876334190369,
-0.015339423902332783,
-0.05064305290579796,
-0.0063627599738538265,
-0.0... |
724ad981-dcb2-48e4-b13b-8126b2d6b973 | description: 'System table containing error codes with the number of times they have
been triggered.'
keywords: ['system table', 'errors']
slug: /operations/system-tables/errors
title: 'system.errors'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
Contains er... | {"source_file": "errors.md"} | [
0.029966654255986214,
-0.038674864917993546,
-0.028496533632278442,
-0.03361174836754799,
0.04061632603406906,
-0.05569317191839218,
0.000022430620447266847,
0.043887101113796234,
0.019950751215219498,
0.09239855408668518,
0.009074261412024498,
-0.04074783995747566,
0.14857006072998047,
-0... |
6f683883-ef89-4cad-802f-308373417577 | description: 'System table containing licenses of third-party libraries that are located
in the contrib directory of ClickHouse sources.'
keywords: ['system table', 'licenses']
slug: /operations/system-tables/licenses
title: 'system.licenses'
doc_type: 'reference'
system.licenses
Contains licenses of third-part... | {"source_file": "licenses.md"} | [
0.005375465843826532,
-0.021433642134070396,
-0.113616444170475,
-0.07814858853816986,
0.061317212879657745,
-0.032988373190164566,
0.09249652177095413,
-0.04071633145213127,
0.0028272673953324556,
0.03484570235013962,
0.08819454163312912,
-0.02243766561150551,
0.07682120054960251,
-0.1274... |
4d93083a-c0ea-471b-b5bc-3c6df1bb6ec1 | description: 'System table containing information useful for an overview of memory
usage and ProfileEvents of users.'
keywords: ['system table', 'user_processes']
slug: /operations/system-tables/user_processes
title: 'system.user_processes'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/... | {"source_file": "user_processes.md"} | [
0.10002268850803375,
-0.02056335099041462,
-0.12968957424163818,
-0.0038652417715638876,
-0.008150359615683556,
-0.018805228173732758,
0.12452729791402817,
0.11108049750328064,
-0.02968798205256462,
0.06380810588598251,
-0.007947755977511406,
0.005373690742999315,
0.061588045209646225,
-0.... |
91d1d3e6-a281-4460-b542-40a3a5f648ec | description: 'System table containing information about currently running background
fetches.'
keywords: ['system table', 'replicated_fetches']
slug: /operations/system-tables/replicated_fetches
title: 'system.replicated_fetches'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_tab... | {"source_file": "replicated_fetches.md"} | [
0.008051182143390179,
-0.004060210660099983,
-0.0642898753285408,
-0.018727881833910942,
0.027016734704375267,
-0.12828803062438965,
-0.01066086906939745,
0.027959054335951805,
0.01883663423359394,
0.0913907065987587,
0.00020819815108552575,
-0.039085667580366135,
0.11171014606952667,
-0.1... |
4617cf6c-bf71-4040-b9c9-0a185eec63ba | description: 'System table containing information about supported data types'
keywords: ['system table', 'data_type_families']
slug: /operations/system-tables/data_type_families
title: 'system.data_type_families'
doc_type: 'reference'
Contains information about supported
data types
.
Columns:
name
(
Strin... | {"source_file": "data_type_families.md"} | [
0.005594591144472361,
-0.05536048114299774,
0.020314635708928108,
0.03899798169732094,
-0.020070746541023254,
-0.05569719150662422,
0.07150828093290329,
0.080271877348423,
-0.100405752658844,
-0.008385472930967808,
0.02996794879436493,
-0.033948060125112534,
0.038417767733335495,
-0.008538... |
59c58c78-bfd4-4910-9f81-576102aef8d6 | description: 'System table containing information about projection parts for tables of the MergeTree family.'
keywords: ['system table', 'projection_parts']
slug: /operations/system-tables/projection_parts
title: 'system.projection_parts'
doc_type: 'reference'
system.projection_parts
This table contains informati... | {"source_file": "projection_parts.md"} | [
-0.015831122174859047,
-0.0155255775898695,
-0.06351086497306824,
0.011760089546442032,
0.06619132310152054,
-0.11602037400007248,
0.01734618842601776,
0.06312791258096695,
-0.01860138401389122,
0.018749691545963287,
0.06407743692398071,
0.039897698909044266,
0.05205122381448746,
-0.076590... |
db39d252-0b94-4556-8ec6-c58da2aeb19c | max_date
(
Date
) β The maximum value of the date key in the data part.
min_time
(
DateTime
) β The minimum value of the date and time key in the data part.
max_time
(
DateTime
) β The maximum value of the date and time key in the data part.
partition_id
(
String
) β ID of the partition.
min_block_number
(... | {"source_file": "projection_parts.md"} | [
-0.0303315632045269,
-0.009817867539823055,
-0.055706266313791275,
-0.037432774901390076,
-0.02228544093668461,
-0.09654460102319717,
-0.0594082735478878,
0.13114218413829803,
0.008390357717871666,
-0.042991191148757935,
0.061790041625499725,
0.040755946189165115,
0.02019110880792141,
-0.0... |
b7d7b0ec-fd91-447d-b96c-b38938397aa6 | recompression_ttl_info.max
(
Array(DateTime)
) β The maximum value of the calculated TTL expression within this part. Used to understand whether we have all rows with expired TTL.
group_by_ttl_info.expression
(
Array(String)
) β The TTL expression.
group_by_ttl_info.min
(
Array(DateTime)
) β The minimum value of... | {"source_file": "projection_parts.md"} | [
-0.046565502882003784,
0.0254508089274168,
-0.026530204340815544,
0.002975030802190304,
-0.026217862963676453,
-0.038781847804784775,
-0.03587658330798149,
0.06538458168506622,
0.02104666270315647,
-0.031732331961393356,
-0.013391016982495785,
0.039328787475824356,
0.027038641273975372,
-0... |
fcc22400-eb4f-43a9-9d13-2f259ccae146 | description: 'System table containing information about existing projections in all
tables.'
keywords: ['system table', 'projections']
slug: /operations/system-tables/projections
title: 'system.projections'
doc_type: 'reference'
system.projections
Contains information about existing projections in all tables.
... | {"source_file": "projections.md"} | [
0.04719656705856323,
-0.03260016813874245,
-0.07509057968854904,
0.02729833498597145,
-0.039699845016002655,
-0.06349559128284454,
0.03620326891541481,
0.043994225561618805,
-0.013454221189022064,
0.08839373290538788,
0.01830592192709446,
0.006349849049001932,
0.08675649762153625,
-0.05580... |
43ab5a6f-1016-403e-94d2-eb00e3e3854f | description: 'This table contains histogram metrics that can be calculated instantly
and exported in the Prometheus format. It is always up to date.'
keywords: ['system table', 'histogram_metrics']
slug: /operations/system-tables/histogram_metrics
title: 'system.histogram_metrics'
doc_type: 'reference'
import Sys... | {"source_file": "histogram_metrics.md"} | [
0.06325060874223709,
-0.025587690994143486,
-0.08829192817211151,
-0.00440107099711895,
-0.017145449295639992,
-0.048536885529756546,
0.034973323345184326,
0.03703557699918747,
-0.017748259007930756,
0.06984832882881165,
-0.001614163862541318,
-0.08483512699604034,
0.05771814286708832,
-0.... |
8c2f0dd1-9997-403a-b121-6a391dfd53da | description: 'System table containing stack traces collected by the sampling query
profiler.'
keywords: ['system table', 'trace_log']
slug: /operations/system-tables/trace_log
title: 'system.trace_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.trace... | {"source_file": "trace_log.md"} | [
0.05420379340648651,
-0.07832018285989761,
-0.08779290318489075,
0.007103527896106243,
0.05003652349114418,
-0.13986463844776154,
0.057242389768362045,
0.03543728217482567,
0.0013351843226701021,
0.0654798150062561,
0.012311289086937904,
-0.024532297626137733,
0.0773041620850563,
-0.092207... |
9cf93dee-d944-441f-8a7e-a661a09432ca | increment
(
UInt64
) - For trace type
ProfileEvent
is the amount of increment of profile event, for other trace types is 0.
symbols
, (
Array(LowCardinality(String))
), If the symbolization is enabled, contains demangled symbol names, corresponding to the
trace
.
lines
, (
Array(LowCardinality(String))
), If th... | {"source_file": "trace_log.md"} | [
0.0720023512840271,
-0.017640413716435432,
-0.06955336779356003,
0.025174878537654877,
-0.027054475620388985,
-0.020168041810393333,
0.10914064943790436,
0.014484301209449768,
0.022084034979343414,
-0.03298638015985489,
0.04720962792634964,
-0.009544780477881432,
0.0009694457985460758,
-0.... |
d2cdc312-ef4d-40a7-b194-fa7f786558e5 | description: 'System table containing all active roles at the moment, including the
current role of the current user and the granted roles for the current role'
keywords: ['system table', 'enabled_roles']
slug: /operations/system-tables/enabled_roles
title: 'system.enabled_roles'
doc_type: 'reference'
Contains al... | {"source_file": "enabled_roles.md"} | [
0.035222120583057404,
-0.03417126089334488,
-0.026170819997787476,
0.03488839790225029,
0.025923749431967735,
0.003779471619054675,
0.08384039998054504,
0.03201741352677345,
-0.16071867942810059,
-0.02249380201101303,
0.05014028027653694,
0.011754961684346199,
0.023951798677444458,
0.03516... |
1da994bb-735f-4b34-b2f3-6efe18c77740 | description: 'This table contains warning messages about clickhouse server.'
keywords: [ 'system table', 'warnings' ]
slug: /operations/system-tables/system_warnings
title: 'system.warnings'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.warnings
This ... | {"source_file": "system_warnings.md"} | [
0.04707257077097893,
-0.05916237086057663,
-0.07802391797304153,
0.02964741550385952,
0.0424458272755146,
-0.05109260976314545,
0.11430148780345917,
-0.00167759764008224,
-0.0017332349671050906,
0.038182228803634644,
0.014867868274450302,
-0.05180243402719498,
0.19088125228881836,
-0.06764... |
2658f5b7-10b2-4e89-ac4a-67d9876409b1 | description: 'System table containing logging entries with information about
BACKUP
and
RESTORE
operations.'
keywords: ['system table', 'backups']
slug: /operations/system-tables/backups
title: 'system.backups'
doc_type: 'reference'
system.backups
Contains a list of all
BACKUP
or
RESTORE
operations with... | {"source_file": "backups.md"} | [
-0.029416099190711975,
-0.044003620743751526,
-0.05154069513082504,
0.021885661408305168,
0.013227195478975773,
-0.030953820794820786,
0.04938647523522377,
0.013976102694869041,
-0.052317168563604355,
0.03586335480213165,
0.0008541453862562776,
0.03641821816563606,
0.0742180198431015,
-0.0... |
9bf3e238-255a-4dbd-9db6-51f7a4e97ae0 | Here's the markdown table with the name and comment columns:
| Column | Description |
|---------------------|-------------------------------------------------------------------------------------------... | {"source_file": "backups.md"} | [
-0.058968063443899155,
0.03293747827410698,
-0.03959232568740845,
0.07056556642055511,
-0.006374670658260584,
-0.041307996958494186,
0.029189106076955795,
0.016059471294283867,
-0.025771012529730797,
-0.003245303640142083,
0.02613288350403309,
-0.044407982379198074,
0.12917965650558472,
-0... |
e01215e6-57e6-498d-a803-9ed74454b1bc | description: 'System table containing information about configured roles.'
keywords: ['system table', 'roles']
slug: /operations/system-tables/roles
title: 'system.roles'
doc_type: 'reference'
system.roles
Contains information about configured
roles
.
Columns:
name
(
String
) β Role name.
id
(
UUID
)... | {"source_file": "roles.md"} | [
0.049525193870067596,
-0.006662989035248756,
-0.11468435078859329,
0.05851642042398453,
0.009016837924718857,
-0.0351518839597702,
0.06014841049909592,
0.04617815092206001,
-0.12678030133247375,
-0.021955640986561775,
0.006512906402349472,
0.02349265106022358,
0.07199075073003769,
-0.03473... |
a1527c11-02a0-431a-a9dd-37925408616d | description: 'System table containing active roles for the current user.'
keywords: ['system table', 'current_roles']
slug: /operations/system-tables/current_roles
title: 'system.current_roles'
doc_type: 'reference'
Contains active roles of a current user.
SET ROLE
changes the contents of this table.
Columns:
... | {"source_file": "current_roles.md"} | [
0.012809502892196178,
-0.04115179553627968,
-0.04198308289051056,
0.01940031722187996,
-0.02095954492688179,
-0.03134043514728546,
0.10488935559988022,
0.0772276297211647,
-0.14336659014225006,
0.024554923176765442,
0.011120007373392582,
-0.010321994312107563,
0.03249931335449219,
0.032224... |
6c196a8e-03bf-4aaf-b4ae-b4e61c98e7cf | description: 'System table containing a list of user accounts configured on the server.'
keywords: ['system table', 'users']
slug: /operations/system-tables/users
title: 'system.users'
doc_type: 'reference'
system.users
Contains a list of
user accounts
configured on the server.
Columns:
name
(
String
)... | {"source_file": "users.md"} | [
0.009131780825555325,
0.00308447377756238,
-0.14317762851715088,
0.017882993444800377,
-0.02297464944422245,
-0.01250837929546833,
0.0915057584643364,
0.017726724967360497,
-0.021637042984366417,
-0.017676889896392822,
0.019011737778782845,
-0.023313969373703003,
0.05295058339834213,
-0.03... |
3390d489-8e17-4eb5-9b44-461c9e645ddf | description: 'System table containing information about events that occurred with
data parts in the MergeTree family tables, such as adding or merging of data.'
keywords: ['system table', 'part_log']
slug: /operations/system-tables/part_log
title: 'system.part_log'
doc_type: 'reference'
import SystemTableCloud fr... | {"source_file": "part_log.md"} | [
0.04156169667840004,
-0.02629736065864563,
0.024978764355182648,
-0.007365113589912653,
0.05601079761981964,
-0.12315307557582855,
0.04218244180083275,
0.025322217494249344,
0.034976597875356674,
0.05708624795079231,
0.034853413701057434,
-0.030006660148501396,
0.08352424204349518,
-0.0837... |
28dab216-9113-4549-b25b-5650b92605b3 | path_on_disk
(
String
) β Absolute path to the folder with data part files.
rows
(
UInt64
) β The number of rows in the data part.
size_in_bytes
(
UInt64
) β Size of the data part in bytes.
merged_from
(
Array(String)
) β An array of names of the parts which the current part was made up from (after the merge)... | {"source_file": "part_log.md"} | [
0.05962106212973595,
-0.04387491196393967,
-0.06272837519645691,
0.010537161491811275,
0.010035715065896511,
-0.09670240432024002,
0.014116930775344372,
0.12540876865386963,
-0.005592041183263063,
0.003912379499524832,
0.05336907505989075,
0.06100761517882347,
0.02977141924202442,
-0.07986... |
36b69d12-031d-414a-ab5c-bd374ef036b8 | Example
sql
SELECT * FROM system.part_log LIMIT 1 FORMAT Vertical;
text
Row 1:
ββββββ
hostname: clickhouse.eu-central1.internal
query_id:
event_type: MergeParts
merge_reason: RegularMerge
merge_algorithm: Vertical
event_date: 2025-07-19
event_time: ... | {"source_file": "part_log.md"} | [
0.044240064918994904,
-0.030187644064426422,
0.021147344261407852,
-0.008343660272657871,
0.03791220113635063,
-0.1072041466832161,
0.02476462721824646,
0.021573811769485474,
0.046082012355327606,
0.019752440974116325,
0.046107128262519836,
-0.028313331305980682,
-0.012603997252881527,
-0.... |
33f6e537-9354-4a05-a25e-57a53e3cda84 | description: 'System table containing information about and status of replicated tables
residing on the local server. Useful for monitoring.'
keywords: ['system table', 'replicas']
slug: /operations/system-tables/replicas
title: 'system.replicas'
doc_type: 'reference'
system.replicas
Contains information and st... | {"source_file": "replicas.md"} | [
-0.006903640925884247,
0.007495887111872435,
-0.10373303294181824,
0.03271428495645523,
0.014363802038133144,
-0.07591383159160614,
0.015845704823732376,
-0.013572847470641136,
-0.033522460609674454,
0.09979109466075897,
0.030373213812708855,
-0.02834390476346016,
0.08650681376457214,
-0.0... |
3e0b5cfe-d552-4157-a563-1efed968d83f | is_session_expired
(
UInt8
) - the session with ClickHouse Keeper has expired. Basically the same as
is_readonly
.
future_parts
(
UInt32
) - The number of data parts that will appear as the result of INSERTs or merges that haven't been done yet.
parts_to_check
(
UInt32
) - The number of data parts in the queue ... | {"source_file": "replicas.md"} | [
-0.02172747254371643,
-0.014100763015449047,
-0.059597164392471313,
0.011771748773753643,
0.01425464078783989,
-0.13052384555339813,
0.008527602069079876,
-0.019769158214330673,
0.01562116201967001,
0.06628338247537613,
0.05086376890540123,
-0.022810686379671097,
0.02746760845184326,
-0.00... |
efcd63e2-fc21-4bb8-9f6f-972d6d9eef7d | lost_part_count
(
UInt64
) - The number of data parts lost in the table by all replicas in total since table creation. Value is persisted in ClickHouse Keeper and can only increase.
last_queue_update_exception
(
String
) - When the queue contains broken entries. Especially important when ClickHouse breaks backward ... | {"source_file": "replicas.md"} | [
0.03131233900785446,
-0.0519842728972435,
0.006240897811949253,
0.045697927474975586,
-0.0018750015879049897,
-0.09827584773302078,
-0.0326087549328804,
-0.04233178496360779,
-0.004302854649722576,
0.08929543197154999,
0.03573115915060043,
-0.0462670736014843,
0.051423199474811554,
-0.0297... |
365b0ce4-ff70-4b7c-8059-9e4a2f982922 | description: 'System table containing information about and status of replicated database.'
keywords: ['system table', 'database_replicas']
slug: /operations/system-tables/database_replicas
title: 'system.database_replicas'
doc_type: 'reference'
Contains information of each Replicated database replicas.
Columns:
... | {"source_file": "database_replicas.md"} | [
0.03525771200656891,
-0.06437231600284576,
-0.09765760600566864,
-0.006817162968218327,
-0.024511581286787987,
-0.10621026158332825,
0.020851798355579376,
0.014026865363121033,
-0.030239267274737358,
0.07792805135250092,
0.010996261611580849,
-0.011782648973166943,
0.11975976824760437,
-0.... |
35e41cc7-5996-4aec-9d2d-c91ba6f97a6b | description: 'System table containing information about Refreshable Materialized Views.'
keywords: ['system table', 'view_refreshes']
slug: /operations/system-tables/view_refreshes
title: 'system.view_refreshes'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
syst... | {"source_file": "view_refreshes.md"} | [
0.01196164172142744,
-0.08951012045145035,
-0.06741032004356384,
0.006688795983791351,
0.029884053394198418,
-0.07394006848335266,
-0.009130513295531273,
-0.022869016975164413,
0.004319090861827135,
0.10435450822114944,
0.021288182586431503,
-0.007713197730481625,
0.07507314532995224,
-0.0... |
9a825ab7-3f3f-4b17-840f-634c25da50ae | Example
```sql
SELECT
database,
view,
status,
last_refresh_result,
last_refresh_time,
next_refresh_time
FROM system.view_refreshes
ββdatabaseββ¬βviewββββββββββββββββββββββββ¬βstatusβββββ¬βlast_refresh_resultββ¬βββlast_refresh_timeββ¬βββnext_refresh_timeββ
β default β hello_documentation_reader β... | {"source_file": "view_refreshes.md"} | [
0.04039771109819412,
-0.09202982485294342,
-0.08411618322134018,
0.06537392735481262,
-0.06046360731124878,
-0.007921326905488968,
0.03592068329453468,
0.025080503895878792,
0.004175178706645966,
0.04152485355734825,
0.05566570162773132,
0.01918203942477703,
0.04504677280783653,
-0.0462723... |
20bb8c66-ae31-4ae7-a127-7d7114638b59 | description: 'System table containing information about tables that drop table has
been executed on but for which data cleanup has not yet been performed'
keywords: ['system table', 'dropped_tables']
slug: /operations/system-tables/dropped_tables
title: 'system.dropped_tables'
doc_type: 'reference'
Contains infor... | {"source_file": "dropped_tables.md"} | [
0.004625394474714994,
-0.023012353107333183,
-0.035429880023002625,
0.04686564579606056,
0.0845843032002449,
-0.123675636947155,
0.08862468600273132,
0.03822365403175354,
0.00921811442822218,
0.03936181962490082,
0.05337756127119064,
0.0033822916448116302,
0.03359246626496315,
-0.065559051... |
0ad6a2b5-14be-4301-927c-c82d33c48838 | description: 'Overview of what system tables are and why they are useful.'
keywords: ['system tables', 'overview']
pagination_next: operations/system-tables/asynchronous_metric_log
sidebar_label: 'Overview'
sidebar_position: 52
slug: /operations/system-tables/
title: 'System Tables'
doc_type: 'reference' | {"source_file": "index.md"} | [
-0.011981352232396603,
-0.043988186866045,
-0.08711706101894379,
-0.02627117931842804,
-0.0217881016433239,
-0.020457593724131584,
0.06151158735156059,
0.09490694105625153,
-0.029741233214735985,
0.053836628794670105,
-0.017468051984906197,
0.05190729722380638,
0.0596199706196785,
-0.03081... |
1453b3f4-b460-4b2f-8e6a-6e78a0f03084 | description: 'System table containing information about contributors.'
keywords: ['system table', 'contributors']
slug: /operations/system-tables/contributors
title: 'system.contributors'
doc_type: 'reference'
Contains information about contributors. The order is random at query execution time.
Columns:
nam... | {"source_file": "contributors.md"} | [
0.08482580631971359,
-0.018216323107481003,
-0.023254137486219406,
0.010340367443859577,
0.004476351663470268,
-0.03591446951031685,
0.12746091187000275,
0.007423584349453449,
0.0210371445864439,
0.09113015979528427,
0.052500445395708084,
-0.0019958389457315207,
0.061190299689769745,
-0.11... |
19870658-f638-4627-ba16-8e9f887353d6 | description: 'System table containing information about parts of MergeTree dropped
tables from
system.dropped_tables
'
keywords: ['system table', 'dropped_tables_parts']
slug: /operations/system-tables/dropped_tables_parts
title: 'system.dropped_tables_parts'
doc_type: 'reference'
Contains information about part... | {"source_file": "dropped_tables_parts.md"} | [
0.023212943226099014,
-0.02109936997294426,
0.01732579804956913,
-0.011723168194293976,
0.054781049489974976,
-0.0943947434425354,
0.044063668698072433,
0.0855092853307724,
-0.07470200955867767,
-0.0014440539525821805,
0.028493087738752365,
-0.014723662286996841,
0.05425164848566055,
-0.04... |
90f0442a-310b-480e-a6c3-0e0fc33b03da | description: 'System table containing information about executed queries, for example,
start time, duration of processing, error messages.'
keywords: ['system table', 'query_log']
slug: /operations/system-tables/query_log
title: 'system.query_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_sn... | {"source_file": "query_log.md"} | [
0.0483911968767643,
0.0004301743465475738,
-0.05139689892530441,
0.01746797189116478,
-0.02293410710990429,
-0.08078084141016006,
0.06314995139837265,
-0.03345191851258278,
0.04164576530456543,
0.1036858931183815,
-0.016136206686496735,
0.008715087547898293,
0.12912622094154358,
-0.1054767... |
3c381e4f-53b1-4cf2-88dd-c8e4959abd1c | query_start_time
(
DateTime
) β Start time of query execution.
query_start_time_microseconds
(
DateTime64
) β Start time of query execution with microsecond precision.
query_duration_ms
(
UInt64
) β Duration of query execution in milliseconds.
read_rows
(
UInt64
) β Total number of rows read from all tables a... | {"source_file": "query_log.md"} | [
0.01922466978430748,
-0.02810850739479065,
-0.054822519421577454,
0.06693657487630844,
-0.04544451832771301,
-0.09169206023216248,
-0.0036143397446721792,
0.01779678463935852,
0.05645669996738434,
0.03296950086951256,
-0.07715164870023727,
0.04255058243870735,
0.04529808834195137,
-0.05291... |
3f682e5a-c2aa-4ac1-8199-2a47ea08bdbd | is_initial_query
(
UInt8
) β Query type. Possible values:
1 β Query was initiated by the client.
0 β Query was initiated by another query as part of distributed query execution.
user
(
String
) β Name of the user who initiated the current query.
query_id
(
String
) β ID of the query.
address
(
IPv6
) β IP... | {"source_file": "query_log.md"} | [
-0.023203637450933456,
0.010661059990525246,
-0.06091424450278282,
0.021774297580122948,
-0.100788414478302,
-0.10168386250734329,
-0.0294530987739563,
0.02344094216823578,
-0.051886655390262604,
-0.0027861774433404207,
-0.013481047004461288,
0.004361418075859547,
0.05097180977463722,
-0.0... |
c2743b44-70fb-4f73-96ca-45a37a234e34 | ProfileEvents
(
Map(String, UInt64)
) β ProfileEvents that measure different metrics. The description of them could be found in the table
system.events
Settings
(
Map(String, String)
) β Settings that were changed when the client ran the query. To enable logging changes to settings, set the
log_query_settings
pa... | {"source_file": "query_log.md"} | [
0.039328768849372864,
-0.061317771673202515,
-0.03730560094118118,
0.06563200056552887,
-0.07162369787693024,
-0.060665518045425415,
0.03365236893296242,
0.04098526015877724,
-0.004724834114313126,
0.014052102342247963,
-0.0017861708765849471,
-0.02516539767384529,
0.03327621519565582,
-0.... |
b4bd7975-a132-496e-84e2-b62802f17e7d | text
Row 1:
ββββββ
hostname: clickhouse.eu-central1.internal
type: QueryFinish
event_date: 2021-11-03
event_time: 2021-11-03 16:13:54
event_time_microseconds: 2021-11-03 16:13:54.953024
quer... | {"source_file": "query_log.md"} | [
0.0688166543841362,
-0.017892630770802498,
-0.07700635492801666,
0.06028037145733833,
-0.028059320524334908,
-0.09387940913438797,
0.036472465842962265,
-0.023276694118976593,
0.007538520731031895,
0.055277470499277115,
0.020149629563093185,
-0.0622541643679142,
0.031175924465060234,
-0.04... |
6a6d3231-0612-46a3-90be-4137958a9fc7 | Settings: {'load_balancing':'random','max_memory_usage':'10000000000'}
used_aggregate_functions: []
used_aggregate_function_combinators: []
used_database_engines: []
used_data_type_families: []
used_dictionaries: []
used_forma... | {"source_file": "query_log.md"} | [
0.055705804377794266,
-0.039590295404195786,
-0.12016945332288742,
0.028497550636529922,
-0.06918036192655563,
-0.0692397877573967,
0.01381010189652443,
0.046604596078395844,
-0.047023605555295944,
0.04969657585024834,
-0.009837350808084011,
-0.020280908793210983,
-0.012490551918745041,
-0... |
5a263f6c-2a38-41a5-944f-7902fa377238 | Cloud example
In ClickHouse Cloud,
system.query_log
is local to each node; to see all entries you must query via
clusterAllReplicas
.
For example, to aggregate query_log rows from every replica in the βdefaultβ cluster you can write:
sql
SELECT *
FROM clusterAllReplicas('default', system.query_log)
WHERE even... | {"source_file": "query_log.md"} | [
0.09663444757461548,
-0.05459391698241234,
0.017652638256549835,
0.058268893510103226,
0.027897538617253304,
-0.028489060699939728,
0.010756297037005424,
-0.09759189188480377,
0.061308592557907104,
0.06818483024835587,
0.010698673315346241,
-0.040790583938360214,
0.03238032013177872,
-0.06... |
89460664-8cd3-4499-8e86-811bbee56c3a | description: 'System table containing logging entries.'
keywords: ['system table', 'text_log']
slug: /operations/system-tables/text_log
title: 'system.text_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.text_log
Contains logging entries. The loggi... | {"source_file": "text_log.md"} | [
0.07269939035177231,
0.0010823890333995223,
-0.020158639177680016,
-0.009320493787527084,
0.013623991049826145,
-0.11722707748413086,
0.03329772502183914,
0.021875204518437386,
0.048547208309173584,
0.10724731534719467,
-0.012269244529306889,
-0.0487755686044693,
0.10816527903079987,
-0.07... |
6fada682-21fa-4f8e-89ae-7b03591753c8 | value9
(String) - Argument 9 that was used to format the message.
value10
(String) - Argument 10 that was used to format the message.
Example
sql
SELECT * FROM system.text_log LIMIT 1 \G
text
Row 1:
ββββββ
hostname: clickhouse.eu-central1.internal
event_date: 2020-09-10
event_tim... | {"source_file": "text_log.md"} | [
0.02505522035062313,
0.023991234600543976,
-0.0494171679019928,
-0.012692012824118137,
-0.04819165915250778,
-0.052790090441703796,
0.10184477269649506,
-0.010528523474931717,
0.06363663822412491,
0.0439787395298481,
-0.007294890005141497,
-0.05963561311364174,
-0.013394497334957123,
-0.05... |
366eff9d-d5de-4438-bb6b-20997d14cc3f | description: 'System table containing information about normal and aggregate functions.'
keywords: ['system table', 'functions']
slug: /operations/system-tables/functions
title: 'system.functions'
doc_type: 'reference'
Contains information about normal and aggregate functions.
Columns:
name
(
String
) β Th... | {"source_file": "functions.md"} | [
-0.003328838152810931,
-0.03880402818322182,
-0.03712151199579239,
0.0009164816583506763,
-0.06530974805355072,
-0.07994505017995834,
0.02549862489104271,
0.15479795634746552,
-0.0646994560956955,
0.013124666176736355,
0.024108367040753365,
-0.01651979610323906,
0.06322424858808517,
-0.049... |
c6ed229c-07f4-4003-acaa-53bb571034fe | description: 'System table containing historical values for
system.asynchronous_metrics
,
which are saved once per time interval (one second by default)'
keywords: ['system table', 'asynchronous_metric_log']
slug: /operations/system-tables/asynchronous_metric_log
title: 'system.asynchronous_metric_log'
doc_type: 're... | {"source_file": "asynchronous_metric_log.md"} | [
0.013582324609160423,
-0.012127437628805637,
-0.1091718003153801,
0.05588069558143616,
-0.0015038744313642383,
-0.07038640975952148,
0.018998045474290848,
-0.001141283893957734,
0.07313256710767746,
0.05983884632587433,
-0.013882610015571117,
-0.027335062623023987,
0.06847754865884781,
-0.... |
ee511dfa-68d0-4a85-a57e-abd33d8fb77c | description: 'System table containing information about in-progress data part moves
of MergeTree tables. Each data part movement is represented by a single row.'
keywords: ['system table', 'moves']
slug: /operations/system-tables/moves
title: 'system.moves'
doc_type: 'reference'
system.moves
The table contains ... | {"source_file": "moves.md"} | [
0.029346954077482224,
-0.05819670483469963,
-0.027587322518229485,
0.015289443545043468,
-0.0003167171962559223,
-0.14305709302425385,
0.03834155574440956,
0.06186824291944504,
-0.008692659437656403,
0.05994226783514023,
0.05589190497994423,
0.013663406483829021,
0.05348871275782585,
-0.13... |
272eb8ad-4319-4d86-af41-b6327c100b4a | description: 'System table containing information about the databases that are available
to the current user.'
keywords: ['system table', 'databases']
slug: /operations/system-tables/databases
title: 'system.databases'
doc_type: 'reference'
Contains information about the databases that are available to the curren... | {"source_file": "databases.md"} | [
0.02219405025243759,
-0.08213695138692856,
-0.12054681032896042,
0.027693627402186394,
-0.06776321679353714,
-0.07730136066675186,
0.11012930423021317,
0.09150108695030212,
-0.043267350643873215,
-0.014382855966687202,
-0.0034340200945734978,
-0.010926547460258007,
0.10610269010066986,
-0.... |
95820ae6-5a39-4ebc-8af2-165ff1b6ea7b | description: 'System table containing information about maximums for all intervals
of all quotas. Any number of rows or zero can correspond to one quota.'
keywords: ['system table', 'quota_limits']
slug: /operations/system-tables/quota_limits
title: 'system.quota_limits'
doc_type: 'reference'
system.quota_limits
... | {"source_file": "quota_limits.md"} | [
-0.05213280767202377,
-0.011929959058761597,
-0.10443060100078583,
-0.014017220586538315,
-0.03202282637357712,
-0.07220162451267242,
0.06747815012931824,
0.04915030673146248,
0.030865469947457314,
0.0270667914301157,
-0.04027697816491127,
-0.015818065032362938,
0.05869458243250847,
-0.000... |
01fdc8d6-3e02-4ee1-a879-1e0bd07830ce | description: 'System table containing metrics which can be calculated instantly, or
have a current value.'
keywords: ['system table', 'metrics']
slug: /operations/system-tables/metrics
title: 'system.metrics'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
syste... | {"source_file": "metrics.md"} | [
-0.025499438866972923,
-0.07062891870737076,
-0.10937116295099258,
-0.0016724619781598449,
-0.03685366362333298,
-0.053666338324546814,
-0.0019289972260594368,
0.021770106628537178,
0.029879426583647728,
0.08690007776021957,
-0.015179713256657124,
-0.06244506314396858,
0.08803702890872955,
... |
43e27f1f-309d-43af-89f8-1e55b42b5e32 | TablesLoaderBackgroundThreads {#tablesloaderbackgroundthreads}
Number of threads in the async loader background thread pool.
TablesLoaderBackgroundThreadsActive {#tablesloaderbackgroundthreadsactive}
Number of threads in the async loader background thread pool running a task.
AsyncInsertCacheSize {#asyncinsertc... | {"source_file": "metrics.md"} | [
-0.0182806346565485,
-0.050088901072740555,
-0.05961694195866585,
0.05453736335039139,
-0.018357569351792336,
-0.014196633361279964,
0.04555772244930267,
-0.00885468628257513,
0.008537248708307743,
0.0033464417792856693,
-0.03681061789393425,
0.013934156857430935,
0.019636115059256554,
-0.... |
a4b90c33-04dd-4722-8580-f7fecc0bbe14 | BackgroundMovePoolTask {#backgroundmovepooltask}
Number of active tasks in BackgroundProcessingPool for moves
BackgroundSchedulePoolSize {#backgroundschedulepoolsize}
Limit on number of tasks in BackgroundSchedulePool. This pool is used for periodic ReplicatedMergeTree tasks, like cleaning old data parts, alterin... | {"source_file": "metrics.md"} | [
-0.04849459230899811,
-0.017162999138236046,
-0.012748687528073788,
-0.024169115349650383,
0.051609981805086136,
-0.04019100219011307,
0.037749823182821274,
-0.032134801149368286,
0.001561645301990211,
0.0013768111821264029,
-0.03459784388542175,
-0.015093871392309666,
0.07330376654863358,
... |
a6a390f5-7a1b-46df-85bb-3a619986ef74 | DelayedInserts {#delayedinserts}
Number of INSERT queries that are throttled due to high number of active data parts for partition in a MergeTree table.
DestroyAggregatesThreads {#destroyaggregatesthreads}
Number of threads in the thread pool for destroy aggregate states.
DestroyAggregatesThreadsActive {#destro... | {"source_file": "metrics.md"} | [
-0.017051832750439644,
-0.02652471885085106,
0.008099295198917389,
0.008477789349853992,
-0.02212066389620304,
-0.03962540999054909,
0.047017090022563934,
-0.0034487596713006496,
0.06473834067583084,
0.08367129415273666,
0.010723693296313286,
-0.012806992046535015,
-0.015072153881192207,
-... |
0cf003b2-e070-4d3a-ab41-796397cf8856 | GlobalThread {#globalthread}
Number of threads in global thread pool.
GlobalThreadActive {#globalthreadactive}
Number of threads in global thread pool running a task.
HTTPConnection {#httpconnection}
Number of connections to HTTP server
HashedDictionaryThreads {#hasheddictionarythreads}
Number of threads ... | {"source_file": "metrics.md"} | [
-0.03404199331998825,
-0.05324632301926613,
0.0242913868278265,
-0.0022061069030314684,
0.002442094264551997,
-0.012879149988293648,
0.043422359973192215,
-0.07993663102388382,
0.007405445445328951,
0.04891442880034447,
0.010547230951488018,
-0.02500770054757595,
0.05193900316953659,
-0.02... |
25b660b3-eb1e-492e-bc20-2133a358ed6a | Sum size of mmapped file regions.
MMappedFiles {#mmappedfiles}
Total number of mmapped files.
MarksLoaderThreads {#marksloaderthreads}
Number of threads in thread pool for loading marks.
MarksLoaderThreadsActive {#marksloaderthreadsactive}
Number of threads in the thread pool for loading marks running a tas... | {"source_file": "metrics.md"} | [
0.024663470685482025,
-0.03268424794077873,
0.008799667470157146,
-0.020344259217381477,
0.008372006006538868,
-0.0859050452709198,
0.012996395118534565,
0.04560333490371704,
0.00453103706240654,
0.03415807709097862,
-0.04088294506072998,
0.005763358436524868,
-0.00021731053129769862,
-0.0... |
08686081-37a1-4668-b740-27a0ab66abb6 | OpenFileForRead {#openfileforread}
Number of files open for reading
OpenFileForWrite {#openfileforwrite}
Number of files open for writing
ParallelFormattingOutputFormatThreads {#parallelformattingoutputformatthreads}
Number of threads in the ParallelFormattingOutputFormatThreads thread pool.
ParallelFormatt... | {"source_file": "metrics.md"} | [
-0.07046820968389511,
-0.03636142984032631,
0.028705600649118423,
-0.00028962595388293266,
0.038917891681194305,
-0.036807164549827576,
0.028849544003605843,
-0.028779268264770508,
0.08191843330860138,
0.02097569778561592,
0.07127054035663605,
0.03950117528438568,
0.05155063048005104,
-0.0... |
54c291a6-5823-4e6c-81e8-19bad437fdea | RemoteRead {#remoteread}
Number of read with remote reader in fly
ReplicatedChecks {#replicatedchecks}
Number of data parts checking for consistency
ReplicatedFetch {#replicatedfetch}
Number of data parts being fetched from replica
ReplicatedSend {#replicatedsend}
Number of data parts being sent to replic... | {"source_file": "metrics.md"} | [
-0.0471627339720726,
-0.09378048777580261,
0.008375320583581924,
-0.008274056948721409,
0.019767476245760918,
-0.01493670791387558,
-0.01065337285399437,
-0.05593829229474068,
0.0347275473177433,
0.09994126111268997,
0.0029362544883042574,
0.03272788226604462,
0.08032157272100449,
-0.08904... |
fd621c0f-6738-4e2a-852f-1eeef78430f5 | TemporaryFilesForJoin {#temporaryfilesforjoin}
Number of temporary files created for JOIN
TemporaryFilesForSort {#temporaryfilesforsort}
Number of temporary files created for external sorting
TemporaryFilesUnknown {#temporaryfilesunknown}
Number of temporary files created without known purpose
ThreadPoolFSR... | {"source_file": "metrics.md"} | [
-0.03978527709841728,
-0.020459990948438644,
-0.029803572222590446,
0.011256188154220581,
0.06007044389843941,
-0.06851331144571304,
0.05744251236319542,
0.013257232494652271,
0.04445604979991913,
0.08521037548780441,
0.05522669479250908,
0.0035981221590191126,
0.03227434307336807,
-0.0202... |
3cf9a4fb-0e3b-4ae5-b254-7b3f55d4d881 | description: 'System table which shows the content of the query cache.'
keywords: ['system table', 'query_cache']
slug: /operations/system-tables/query_cache
title: 'system.query_cache'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.query_cache
Shows t... | {"source_file": "query_cache.md"} | [
0.02732313983142376,
-0.0024123613256961107,
-0.07186468690633774,
-0.0014239824377000332,
0.000236429666983895,
-0.08495073765516281,
0.04745131731033325,
0.0009453188395127654,
0.030616475269198418,
0.0730610266327858,
-0.022025512531399727,
0.049415331333875656,
0.08049467951059341,
-0.... |
2fa798e6-b301-4de2-a841-d6f1b9610bae | description: 'System table containing a single row with a single
dummy
UInt8 column
containing the value 0. Similar to the
DUAL
table found in other DBMSs.'
keywords: ['system table', 'one']
slug: /operations/system-tables/one
title: 'system.one'
doc_type: 'reference'
system.one
This table contains a single... | {"source_file": "one.md"} | [
-0.04562658816576004,
0.024188753217458725,
-0.07697370648384094,
0.019897399470210075,
-0.058544356375932693,
-0.09036945551633835,
0.07131030410528183,
0.08330482244491577,
-0.0007274926756508648,
0.04393388330936432,
0.08142675459384918,
-0.08196866512298584,
0.08137266337871552,
-0.077... |
4f44e920-4d23-4eb7-b147-792dd177f0d1 | description: 'System table containing information about pending asynchronous inserts
in queue.'
keywords: ['system table', 'asynchronous_inserts']
slug: /operations/system-tables/asynchronous_inserts
title: 'system.asynchronous_inserts'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_sys... | {"source_file": "asynchronous_inserts.md"} | [
-0.007139458321034908,
-0.03689687326550484,
-0.10628117620944977,
0.030463863164186478,
-0.021398384124040604,
-0.10662263631820679,
0.04866306111216545,
-0.022538838908076286,
0.03820646554231644,
0.10027442872524261,
0.025515645742416382,
-0.007867232896387577,
0.12338192760944366,
-0.1... |
43106ec2-7bb6-4994-a446-d84b5e725d19 | description: 'System table containing a list of time zones that are supported by the
ClickHouse server.'
keywords: ['system table', 'time_zones']
slug: /operations/system-tables/time_zones
title: 'system.time_zones'
doc_type: 'reference'
system.time_zones
Contains a list of time zones that are supported by the ... | {"source_file": "time_zones.md"} | [
0.02748611569404602,
-0.0701860785484314,
-0.06548687070608139,
0.01198406983166933,
0.01946088671684265,
-0.1013912558555603,
-0.017032982781529427,
-0.05891871452331543,
-0.07773731648921967,
0.04377834498882294,
0.017813827842473984,
-0.08120394498109818,
-0.01721620187163353,
-0.010342... |
24f592ed-56c1-49fc-966c-c26babd75e5f | description: 'System table containing information about all cached file schemas.'
keywords: ['system table', 'schema_inference_cache']
slug: /operations/system-tables/schema_inference_cache
title: 'system.schema_inference_cache'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_... | {"source_file": "schema_inference_cache.md"} | [
0.014325958676636219,
-0.024299079552292824,
-0.09599258005619049,
-0.02434597909450531,
0.06252080947160721,
-0.04928821325302124,
0.01496527623385191,
0.035871922969818115,
-0.00031502396450378,
0.08077214658260345,
0.007386953104287386,
0.015997156500816345,
0.05756188929080963,
-0.1000... |
7dffbf88-f806-45ca-9399-01bc49a9ba4f | Let's see the content of the
system.schema_inference_cache
table:
sql
SELECT *
FROM system.schema_inference_cache
FORMAT Vertical
response
Row 1:
ββββββ
storage: File
source: /home/droscigno/user_files/data.jsonl
format: JSONEachRow
additional_format_info: schema_inf... | {"source_file": "schema_inference_cache.md"} | [
0.00021378330711741,
0.012299262918531895,
-0.1081121489405632,
0.02064506709575653,
-0.011494277976453304,
-0.06327243149280548,
-0.021557649597525597,
0.08133871853351593,
-0.07319297641515732,
0.01004899200052023,
0.014183379709720612,
-0.03877571225166321,
-0.017307661473751068,
0.0172... |
11d0df5e-2b6b-4988-a675-3d7459c831a3 | description: 'System table similar to
system.numbers
but reads are parallelized
and numbers can be returned in any order.'
keywords: ['system table', 'numbers_mt']
slug: /operations/system-tables/numbers_mt
title: 'system.numbers_mt'
doc_type: 'reference'
The same as
system.numbers
but reads are parallelized.... | {"source_file": "numbers_mt.md"} | [
-0.03261946886777878,
-0.025160131976008415,
-0.07780910283327103,
-0.021470312029123306,
-0.09302187711000443,
-0.09421629458665848,
0.009808062575757504,
0.051547929644584656,
-0.010716809891164303,
0.04857255145907402,
0.053027257323265076,
0.09677835553884506,
0.08432476967573166,
-0.0... |
df7ef3c7-1db1-42ee-bdf7-370fa5c8a013 | description: 'System table containing history of metrics values from tables
system.metrics
and
system.events
, periodically flushed to disk.'
keywords: ['system table', 'metric_log']
slug: /operations/system-tables/metric_log
title: 'system.metric_log'
doc_type: 'reference'
import SystemTableCloud from '@site/... | {"source_file": "metric_log.md"} | [
0.07141972333192825,
-0.01703198254108429,
-0.02864140272140503,
0.010693563148379326,
-0.007497171871364117,
-0.11506146192550659,
0.02339799515902996,
-0.005135352723300457,
0.09248315542936325,
0.0773104652762413,
0.0017775832675397396,
-0.07612604647874832,
0.07794519513845444,
-0.0573... |
c8d964e4-ee96-4846-9673-c5857dd79fe4 | There is also a compatibility schema,
transposed_with_wide_view
, which stores actual data in a table with the transposed schema (
system.transposed_metric_log
) and creates a view on top of it using the wide schema. This view queries the transposed table, making it useful for migrating from the
wide
schema to the
... | {"source_file": "metric_log.md"} | [
-0.013627731241285801,
-0.08470693230628967,
-0.10782370716333389,
0.007971133105456829,
0.013897566124796867,
-0.044986166059970856,
0.045373331755399704,
-0.008407284505665302,
0.03237857297062874,
0.017993316054344177,
0.028056565672159195,
-0.019903119653463364,
0.015515344217419624,
0... |
f9d5dd5a-6a7d-490b-b496-7db0cd78982a | description: 'System table which describes the content of the settings profile: constraints,
roles and users that the setting applies to, parent settings profiles.'
keywords: ['system table', 'settings_profile_elements']
slug: /operations/system-tables/settings_profile_elements
title: 'system.settings_profile_element... | {"source_file": "settings_profile_elements.md"} | [
0.06501970440149307,
-0.005631568375974894,
-0.08339712023735046,
0.03610978648066521,
-0.02765924297273159,
0.004640602972358465,
0.0575970783829689,
0.09593157470226288,
-0.1861124485731125,
-0.02606913074851036,
0.05814807862043381,
-0.05263330042362213,
0.1301732063293457,
-0.042633388... |
0a017cee-2643-40c2-ac3f-5716ee205ed2 | description: 'System table containing formation about global settings for the server,
which are specified in
config.xml
.'
keywords: ['system table', 'server_settings']
slug: /operations/system-tables/server_settings
title: 'system.server_settings'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_... | {"source_file": "server_settings.md"} | [
0.028172291815280914,
-0.04352110996842384,
-0.0481426939368248,
-0.009196389466524124,
-0.008605677634477615,
-0.04384422302246094,
-0.001750631956383586,
0.00856201071292162,
-0.080337293446064,
0.05147598683834076,
0.03028816357254982,
-0.009959748014807701,
0.08789004385471344,
-0.0558... |
0e7cdeff-fe1f-4cd3-8294-f207566e6fb1 | ```text
ββnameβββββββββββββββββββββββββββββββββββββββββββ¬βvalueββ¬βdefaultββ¬βchangedββ¬βdescriptionββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββββ¬βtypeββββ¬βchangeable_without_restartββ¬βis_obsoleteββ
β max_thread_pool_size ... | {"source_file": "server_settings.md"} | [
-0.024720070883631706,
-0.02236374281346798,
-0.05627552792429924,
0.026948940008878708,
-0.03565041720867157,
-0.1068759560585022,
0.07862577587366104,
-0.036192167550325394,
-0.004196907393634319,
0.030602211132645607,
0.009550429880619049,
0.005173245444893837,
0.024140164256095886,
-0.... |
c6fc4f65-b9d7-408f-b8cc-b0dc5cf5a27b | β max_parts_cleaning_thread_pool_size β 128 β 128 β 0 β The number of threads for concurrent removal of inactive data parts. β UInt64 β No β 0 β
β max_backups_io_thread_pool_size ... | {"source_file": "server_settings.md"} | [
-0.032683368772268295,
0.014620726928114891,
-0.023418646305799484,
0.004028550814837217,
-0.00940641574561596,
-0.10708858072757721,
0.04239930585026741,
-0.05135383829474449,
-0.048474207520484924,
0.04313221946358681,
0.05234209820628166,
0.007090692408382893,
0.04920036345720291,
-0.06... |
ad6b50c4-c1e2-45f2-8392-0f4731a46efa | ```
Using of
WHERE changed
can be useful, for example, when you want to check
whether settings in configuration files are loaded correctly and are in use.
sql
SELECT * FROM system.server_settings WHERE changed AND name='max_thread_pool_size'
See also
Settings
Configuration Files
Server Settings | {"source_file": "server_settings.md"} | [
0.05603497475385666,
-0.022549135610461235,
-0.06056062877178192,
0.028714625164866447,
-0.04875880479812622,
-0.03938860073685646,
0.0669887587428093,
0.00124460575170815,
-0.06321981549263,
0.04544462263584137,
0.02802196890115738,
0.02204415574669838,
-0.022886699065566063,
-0.078306004... |
e920b803-ab47-4f69-9642-4cae6bffe8de | description: 'System table containing information about each detached table.'
keywords: ['system table', 'detached_tables']
slug: /operations/system-tables/detached_tables
title: 'system.detached_tables'
doc_type: 'reference'
Contains information of each detached table.
Columns:
database
(
String
) β The n... | {"source_file": "detached_tables.md"} | [
0.0009942760225385427,
-0.027483997866511345,
-0.07851055264472961,
0.053857166320085526,
0.07594148069620132,
-0.10625504702329636,
0.09399032592773438,
0.06137288734316826,
-0.0009372874046675861,
0.05324772372841835,
0.10683871805667877,
-0.019492818042635918,
0.05528547242283821,
-0.04... |
84e59c2f-74c0-4091-a83a-2df6bd21a48e | description: 'System table containing filters for one particular table, as well as
a list of roles and/or users which should use this row policy.'
keywords: ['system table', 'row_policies']
slug: /operations/system-tables/row_policies
title: 'system.row_policies'
doc_type: 'reference'
system.row_policies
Contai... | {"source_file": "row_policies.md"} | [
-0.020613810047507286,
0.004243229050189257,
-0.06961644440889359,
0.0004585881542880088,
0.00933931116014719,
-0.04175394028425217,
0.12078500539064407,
-0.003368010278791189,
-0.0933883860707283,
0.025688810274004936,
-0.010643010027706623,
-0.000772130093537271,
0.0838172510266304,
-0.0... |
6f3a0559-57c2-4d47-943c-79b94cbf49a8 | description: 'System table showing which privileges are granted to ClickHouse user
accounts.'
keywords: ['system table', 'grants']
slug: /operations/system-tables/grants
title: 'system.grants'
doc_type: 'reference'
Privileges granted to ClickHouse user accounts.
Columns:
-
user_name
(
Nullable
(
String
)) β U... | {"source_file": "grants.md"} | [
-0.0018661972135305405,
0.0333118811249733,
-0.04231265187263489,
-0.003479144535958767,
-0.06415458768606186,
-0.024623701348900795,
0.08338338136672974,
-0.027877338230609894,
-0.07175600528717041,
-0.012284516356885433,
0.050820350646972656,
-0.01051928661763668,
0.057176318019628525,
-... |
e0d7d4ac-2822-4f05-9558-5718573b2f84 | description: 'System table containing the history of error values from table
system.errors
,
periodically flushed to disk.'
keywords: ['system table', 'error_log']
slug: /operations/system-tables/system-error-log
title: 'system.error_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_... | {"source_file": "error_log.md"} | [
0.0445687361061573,
0.005754392594099045,
-0.018844004720449448,
0.004750682972371578,
0.003969598561525345,
-0.09363827109336853,
0.025095107033848763,
0.048112351447343826,
0.05300607904791832,
0.10313983261585236,
0.00851418823003769,
-0.0459710918366909,
0.1529712975025177,
-0.09294639... |
2c2e225d-663c-4d94-b492-9cf99529d967 | description: 'System table containing information about messages
received via a streaming engine and parsed with errors.'
keywords: ['system table', 'dead_letter_queue']
slug: /operations/system-tables/dead_letter_queue
title: 'system.dead_letter_queue'
doc_type: 'reference'
Contains information about messages re... | {"source_file": "dead_letter_queue.md"} | [
0.026172149926424026,
-0.06266412138938904,
-0.03807498887181282,
0.055942974984645844,
-0.05138710141181946,
-0.0889853686094284,
0.018597405403852463,
-0.05470070242881775,
0.020121166482567787,
0.07604610174894333,
0.032870691269636154,
-0.02106965333223343,
0.007843767292797565,
-0.061... |
6798455c-1301-4222-ac02-9e49f5ffca29 | Row 2:
ββββββ
table_engine: Kafka
event_date: 2025-05-01
event_time: 2025-05-01 10:34:53
event_time_microseconds: 2025-05-01 10:34:53.910944
database: default
table: kafka
error: Cannot pars... | {"source_file": "dead_letter_queue.md"} | [
0.001725415582768619,
-0.006694488227367401,
-0.020651767030358315,
0.03557610139250755,
-0.08132411539554596,
-0.04634864628314972,
0.011666861362755299,
-0.00033165636705234647,
0.05756198242306709,
0.056863199919462204,
0.08175995200872421,
-0.08017321676015854,
-0.060331057757139206,
-... |
1841d9b1-f7db-478f-b5aa-c27bdc195dba | description: 'System table containing information about settings for MergeTree tables.'
keywords: ['system table', 'merge_tree_settings']
slug: /operations/system-tables/merge_tree_settings
title: 'system.merge_tree_settings'
doc_type: 'reference'
system.merge_tree_settings
Contains information about settings for... | {"source_file": "merge_tree_settings.md"} | [
0.05382823944091797,
0.004512409679591656,
-0.051854703575372696,
-0.0018462854204699397,
-0.04971082881093025,
-0.05387943983078003,
0.010891452431678772,
0.09129573404788971,
-0.13583803176879883,
0.02089318260550499,
0.05867331475019455,
-0.039142265915870667,
0.04199245199561119,
-0.03... |
6e6b0129-4818-4351-abe2-62fe76b49dd0 | Row 2:
ββββββ
name: max_compress_block_size
value: 0
default: 0
changed: 0
description: Compress the pending uncompressed data in buffer if its size is larger or equal than the specified threshold. Block of data will be compressed even if the current granule is not finished. If this setting is not ... | {"source_file": "merge_tree_settings.md"} | [
-0.05381149798631668,
0.05637020617723465,
-0.08197536319494247,
0.006419557146728039,
-0.04819301515817642,
-0.09230440109968185,
-0.02695230208337307,
-0.008175047114491463,
-0.020292365923523903,
0.018969791010022163,
-0.0050282711163163185,
-0.004065955989062786,
0.0027658992912620306,
... |
1b1109a1-56d4-48f3-bd70-a4d2bcd04fc5 | description: 'System table containing a single UInt64 column named
number
that contains
almost all the natural numbers starting from zero.'
keywords: ['system table', 'numbers']
slug: /operations/system-tables/numbers
title: 'system.numbers'
doc_type: 'reference'
system.numbers
This table contains a single UI... | {"source_file": "numbers.md"} | [
0.020247111096978188,
-0.00565007608383894,
-0.10146366059780121,
-0.01597789116203785,
-0.07842963188886642,
-0.0661134198307991,
0.030971527099609375,
0.03259189799427986,
-0.0415855310857296,
0.06739635765552521,
0.03516634926199913,
0.009878503158688545,
0.05144445225596428,
-0.0776989... |
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