id stringlengths 36 36 | document stringlengths 3 3k | metadata stringlengths 23 69 | embeddings listlengths 384 384 |
|---|---|---|---|
7ba9eb08-0d9f-4725-9793-cfbf203a9526 | For the
volume_priority
:
- If all volumes have this parameter, they are prioritized in the specified order.
- If only
some
volumes have it, volumes that do not have it have the lowest priority. Those that do have it are prioritized according to the tag value, the priority of the rest is determined by the order of d... | {"source_file": "settings.md"} | [
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0.0... |
621769af-ebc6-45e4-be42-dc1fe9862a93 | :::note
A value of
0
means all available CPUs will be used.
:::
tcp_close_connection_after_queries_num {#tcp_close_connection_after_queries_num}
Maximum number of queries allowed per TCP connection before the connection is closed. Set to 0 for unlimited queries.
tcp_close_connection_after_queries_seconds {#tcp_... | {"source_file": "settings.md"} | [
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7b05a9fa-89b7-4c32-a904-3a4137c9d35d | Size of cache for text index header in entries. Zero means disabled.
text_index_header_cache_policy {#text_index_header_cache_policy}
Text index header cache policy name.
text_index_header_cache_size {#text_index_header_cache_size}
Size of cache for text index headers. Zero means disabled.
:::note
This settin... | {"source_file": "settings.md"} | [
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f0e5e520-ee99-44f4-823a-325c348c9450 | thread_pool_queue_size {#thread_pool_queue_size}
The maximum number of jobs that can be scheduled on the Global Thread pool. Increasing queue size leads to larger memory usage. It is recommended to keep this value equal to
max_thread_pool_size
.
:::note
A value of
0
means unlimited.
:::
Example
xml
<thread_... | {"source_file": "settings.md"} | [
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0.... |
a7201904-2799-4d12-8347-dac87e9b57ec | Example
xml
<timezone>Asia/Istanbul</timezone>
See also
session_timezone
tmp_path {#tmp_path}
Path on the local filesystem to store temporary data for processing large queries.
:::note
- Only one option can be used to configure temporary data storage:
tmp_path
,
tmp_policy
,
temporary_data_in_cache
.... | {"source_file": "settings.md"} | [
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1b38c6b1-489d-4a00-b6fd-303d4c08342f | total_memory_tracker_sample_probability {#total_memory_tracker_sample_probability}
Allows to collect random allocations and de-allocations and writes them in the
system.trace_log
system table with
trace_type
equal to a
MemorySample
with the specified probability. The probability is for every allocation or deal... | {"source_file": "settings.md"} | [
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d14b43a7-5774-4b36-be61-caf9674ca5c4 | Storage method for data part headers in ZooKeeper. This setting only applies to the
MergeTree
family. It can be specified:
Globally in the
merge_tree
section of the
config.xml
file
ClickHouse uses the setting for all the tables on the server. You can change the setting at any time. Existing tables change thei... | {"source_file": "settings.md"} | [
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-... |
6480702f-7b43-4cd6-8e33-20491f269efd | Users, roles, row policies, quotas, and profiles can be also stored in ZooKeeper:
xml
<user_directories>
<users_xml>
<path>/etc/clickhouse-server/users.xml</path>
</users_xml>
<replicated>
<zookeeper_path>/clickhouse/access/</zookeeper_path>
</replicated>
</user_directories>
You can ... | {"source_file": "settings.md"} | [
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1863e32c-3d96-45d9-977f-ff60582f896e | Type:
Default:
users_config {#users_config}
Path to the file that contains:
User configurations.
Access rights.
Settings profiles.
Quota settings.
Example
xml
<users_config>users.xml</users_config>
validate_tcp_client_information {#validate_tcp_client_information}
Determines whether validation... | {"source_file": "settings.md"} | [
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03bae99f-d167-467e-a0c1-bb32fe3475d8 | Example
xml
<workload_zookeeper_path>/clickhouse/workload/definitions.sql</workload_zookeeper_path>
See Also
-
Workload Hierarchy
-
workload_path
zookeeper {#zookeeper}
Contains settings that allow ClickHouse to interact with a
ZooKeeper
cluster. ClickHouse uses ZooKeeper for storing metadata of replicas ... | {"source_file": "settings.md"} | [
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bcd8188e-2b85-4228-8d54-a2e4818722c6 | | Setting | Description ... | {"source_file": "settings.md"} | [
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64864f9e-1fca-4895-b3f6-13a05f75245b | |
root
(optional) | The znode that is used as the root for znodes used by the ClickHouse server. ... | {"source_file": "settings.md"} | [
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0.01401... |
92d483e7-2e4f-407b-be76-3570576c651c | There is also the
zookeeper_load_balancing
setting (optional) which lets you select the algorithm for ZooKeeper node selection:
| Algorithm Name | Description |
|---------------------... | {"source_file": "settings.md"} | [
-0.004011740442365408,
0.0428333543241024,
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0.03896486759185791,
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f0992300-3e87-4886-9829-07480f0cfa6c | description: 'Documentation for the sampling query profiler tool in ClickHouse'
sidebar_label: 'Query Profiling'
sidebar_position: 54
slug: /operations/optimizing-performance/sampling-query-profiler
title: 'Sampling query profiler'
doc_type: 'reference'
import SelfManaged from '@site/docs/_snippets/_self_managed_on... | {"source_file": "sampling-query-profiler.md"} | [
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-0.08368... |
f960559d-89a4-4d9e-baa3-0c6a0c52084f | Allow introspection functions by the
allow_introspection_functions
setting.
For security reasons, introspection functions are disabled by default.
Use the
addressToLine
,
addressToLineWithInlines
,
addressToSymbol
and
demangle
introspection functions
to get function names and their positions in ClickH... | {"source_file": "sampling-query-profiler.md"} | [
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e49e6007-38c5-4bf8-8c97-72beac6e5b9f | description: 'Documentation for profile guided optimization'
sidebar_label: 'Profile guided optimization (PGO)'
sidebar_position: 54
slug: /operations/optimizing-performance/profile-guided-optimization
title: 'Profile guided optimization'
doc_type: 'guide'
import SelfManaged from '@site/docs/_snippets/_self_managed... | {"source_file": "profile-guided-optimization.md"} | [
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8a10f8d3-8338-450c-94c4-9e42d98bb2dd | description: 'Documentation for the ClickHouse Keeper client utility'
sidebar_label: 'clickhouse-keeper-client'
slug: /operations/utilities/clickhouse-keeper-client
title: 'clickhouse-keeper-client utility'
doc_type: 'reference'
clickhouse-keeper-client utility
A client application to interact with clickhouse-kee... | {"source_file": "clickhouse-keeper-client.md"} | [
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-0.... |
781f5e2d-55f1-4c15-9a12-3dd7ea2fd36e | rmr '<path>' [limit]
-- Recursively deletes path if the subtree size is smaller than the limit. Confirmation required (default limit = 100)
flwc <command>
-- Executes four-letter-word command
help
-- Prints this message
get_direct_children_number '[path]'
-- Get numbers of direct children nodes under a specif... | {"source_file": "clickhouse-keeper-client.md"} | [
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8325a7f1-0156-4413-b3ff-ea989b7aba0d | description: 'Documentation for Clickhouse Obfuscator'
slug: /operations/utilities/clickhouse-obfuscator
title: 'clickhouse-obfuscator'
doc_type: 'reference'
A simple tool for table data obfuscation.
It reads an input table and produces an output table, that retains some properties of input, but contains differen... | {"source_file": "clickhouse-obfuscator.md"} | [
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-0.0... |
5147fbf3-fe82-4bab-a326-007db3f8461c | description: 'Guide to using the format utility for working with ClickHouse data formats'
slug: /operations/utilities/clickhouse-format
title: 'clickhouse-format'
doc_type: 'reference'
clickhouse-format utility
Allows formatting input queries.
Keys:
--help
or
-h
β Produce help message.
--query
β Format... | {"source_file": "clickhouse-format.md"} | [
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19003291-4fca-472d-b370-1b56ecf15461 | description: 'Documentation for Clickhouse-disks'
sidebar_label: 'clickhouse-disks'
sidebar_position: 59
slug: /operations/utilities/clickhouse-disks
title: 'Clickhouse-disks'
doc_type: 'reference'
Clickhouse-disks
A utility providing filesystem-like operations for ClickHouse disks. It can work in both interactiv... | {"source_file": "clickhouse-disks.md"} | [
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0.00090696... |
dd1a4ce3-5836-4778-bc26-3ee164d34d94 | cd (change-dir, change_dir) [--disk disk] <path>
Change directory to path
path
on disk
disk
(default value is a current disk). No disk switching happens.
copy (cp) [--disk-from disk_1] [--disk-to disk_2] <path-from> <path-to>
.
Recursively copy data from
path-from
at disk
disk_1
(default value is a curre... | {"source_file": "clickhouse-disks.md"} | [
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ac5983bf-4da5-4262-9480-a9852bd8d5e3 | description: 'Documentation for clickhouse_backupview {#clickhouse_backupview}'
slug: /operations/utilities/backupview
title: 'clickhouse_backupview'
doc_type: 'reference'
clickhouse_backupview {#clickhouse_backupview}
Python module to help analyzing backups made by the
BACKUP
command.
The main motivation was t... | {"source_file": "backupview.md"} | [
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86667976-afda-4728-ba09-fba16b0fe4f3 | description: 'Documentation for Clickhouse Compressor'
slug: /operations/utilities/clickhouse-compressor
title: 'clickhouse-compressor'
doc_type: 'reference'
Simple program for data compression and decompression.
Examples {#examples}
Compress data with LZ4:
bash
$ ./clickhouse-compressor < input_file > output_... | {"source_file": "clickhouse-compressor.md"} | [
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0.026515066623687744,
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-... |
3014f82b-8755-4df5-813c-1904d745fabc | description: 'Page listing various useful ClickHouse tools and utilities.'
keywords: ['tools', 'utilities']
sidebar_label: 'List of tools and utilities'
sidebar_position: 56
slug: /operations/utilities/
title: 'List of tools and utilities'
doc_type: 'landing-page'
| Tool/Utility | Description |
|------|------------... | {"source_file": "index.md"} | [
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0.09048708528280258,
-0... |
0fe3c32a-935f-4837-b41e-e8e44b1f526a | description: 'Documentation for clickhouse-benchmark '
sidebar_label: 'clickhouse-benchmark'
sidebar_position: 61
slug: /operations/utilities/clickhouse-benchmark
title: 'clickhouse-benchmark'
doc_type: 'reference'
clickhouse-benchmark
Connects to a ClickHouse server and repeatedly sends specified queries.
Synt... | {"source_file": "clickhouse-benchmark.md"} | [
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671e8312-f874-4970-a4ae-966d536a16af | --password=PSWD
β ClickHouse user password. Default value: empty string.
--stacktrace
β Stack traces output. When the key is set,
clickhouse-bencmark
outputs stack traces of exceptions.
--stage=WORD
β Query processing stage at server. ClickHouse stops query processing and returns an answer to
clickhouse-bench... | {"source_file": "clickhouse-benchmark.md"} | [
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0.002316018333658576,
-0.00298488256521523,
0.08165724575519562,
... |
6105ae14-0db3-4a99-8d7e-a1c70361b06a | Endpoint of ClickHouse server.
Number of processed queries.
QPS: How many queries the server performed per second during a period specified in the
--delay
argument.
RPS: How many rows the server reads per second during a period specified in the
--delay
argument.
MiB/s: How many mebibytes the server reads ... | {"source_file": "clickhouse-benchmark.md"} | [
-0.02627207338809967,
-0.005952097941190004,
-0.08537982404232025,
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0.03377509117126465,
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0.020135752856731415,
-0.03293618559837341,
0.0010832281550392509,
0.07358758896589279,
-0.025... |
4a8af07d-60b4-4964-be6e-465a75bfc42a | description: 'Guide to using clickhouse-local for processing data without a server'
sidebar_label: 'clickhouse-local'
sidebar_position: 60
slug: /operations/utilities/clickhouse-local
title: 'clickhouse-local'
doc_type: 'reference'
clickhouse-local
When to use clickhouse-local vs. ClickHouse {#when-to-use-clickho... | {"source_file": "clickhouse-local.md"} | [
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0.021637503057718277,
-0.... |
58ff9d8a-14fa-4a4d-af8a-9bdd3683eece | If the file is sitting on the same machine as
clickhouse-local
, you can simply specify the file to load. The following
reviews.tsv
file contains a sampling of Amazon product reviews:
bash
./clickhouse local -q "SELECT * FROM 'reviews.tsv'"
This command is a shortcut of:
bash
./clickhouse local -q "SELECT * FR... | {"source_file": "clickhouse-local.md"} | [
0.041302964091300964,
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-0.02332557551562786,
0.002794614527374506,
0.02049266... |
0e43c9bc-90b9-419b-927b-22d4719bc070 | Let's see what the most expensive neighborhoods are:
bash
./clickhouse local -q "
SELECT
town,
district,
count() AS c,
round(avg(price)) AS price,
bar(price, 0, 5000000, 100)
FROM s3('https://datasets-documentation.s3.eu-west-3.amazonaws.com/house_parquet/house_0.parquet')
GROUP BY
town,
d... | {"source_file": "clickhouse-local.md"} | [
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0.05370140075683594,
-0.07020305097103119,
0.04048210009932518,
-0.0909... |
29ad56b6-a568-4af8-92cf-70a33a793c3f | --queries-file
- file path with queries to execute.
--queries-file
can be specified multiple times, e.g.
--query queries1.sql --query queries2.sql
. Cannot be used simultaneously with
--query
.
--multiquery, -n
β If specified, multiple queries separated by semicolons can be listed after the
--query
option. Fo... | {"source_file": "clickhouse-local.md"} | [
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-0.0379033237695694,
0.02876933291554451,
-0.064... |
1ec6bc8c-a2d9-438c-b4ee-d8c72a803354 | Related Content {#related-content-1}
Extracting, converting, and querying data in local files using clickhouse-local
Getting Data Into ClickHouse - Part 1
Exploring massive, real-world data sets: 100+ Years of Weather Records in ClickHouse
Blog:
Extracting, Converting, and Querying Data in Local Files using ... | {"source_file": "clickhouse-local.md"} | [
0.019086308777332306,
0.04449994117021561,
0.02548273652791977,
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0.013084247708320618,
0.0662444457411766,
0.00420... |
f93544c2-7428-43e1-94e6-907775a415ff | description: 'Documentation for Odbc Bridge'
slug: /operations/utilities/odbc-bridge
title: 'clickhouse-odbc-bridge'
doc_type: 'reference'
Simple HTTP-server which works like a proxy for ODBC driver. The main motivation
was possible segfaults or another faults in ODBC implementations, which can
crash whole clickhou... | {"source_file": "odbc-bridge.md"} | [
-0.055849138647317886,
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0.006385871674865484,
0.02671789936721325,
-0... |
94377757-8d8d-4dea-b410-20742fb1e420 | description: 'Documentation for Http'
slug: /operations/external-authenticators/http
title: 'HTTP'
doc_type: 'reference'
import SelfManaged from '@site/docs/_snippets/_self_managed_only_no_roadmap.md';
HTTP server can be used to authenticate ClickHouse users. HTTP authentication can only be used as an external ... | {"source_file": "http.md"} | [
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-0.07016903162002563,
0.06254929304122925,
-0.0... |
76981cb2-aa23-4f75-8746-5d1dca07543c | Enabling HTTP authentication using SQL {#enabling-http-auth-using-sql}
When
SQL-driven Access Control and Account Management
is enabled in ClickHouse, users identified by HTTP authentication can also be created using SQL statements.
sql
CREATE USER my_user IDENTIFIED WITH HTTP SERVER 'basic_server' SCHEME 'Basic'... | {"source_file": "http.md"} | [
-0.018916510045528412,
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0.03650331497192383,
-0.033535365015268326,
0.06747893244028091,
0.013... |
3c4acec6-175b-49fb-a91f-3eeecd32575b | description: 'Existing and properly configured ClickHouse users can be authenticated
via Kerberos authentication protocol.'
slug: /operations/external-authenticators/kerberos
title: 'Kerberos'
doc_type: 'reference'
import SelfManaged from '@site/docs/_snippets/_self_managed_only_no_roadmap.md';
Kerberos
Exi... | {"source_file": "kerberos.md"} | [
-0.07712329179048538,
-0.04640025645494461,
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0.027486754581332207,
0.04695255309343338,
-0.03342444449663162,
0.04700266942381859,
0.0... |
9f0d0b76-3e83-4522-8119-aaf7b71d9cdd | Kerberos principal name format usually follows this pattern:
primary/instance@REALM
The
/instance
part may occur zero or more times.
The
primary
part of the canonical principal name of the initiator is expected to match the kerberized user name for authentication to succeed
.
Enabling Kerberos in
users.... | {"source_file": "kerberos.md"} | [
0.005368469748646021,
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0.019842566922307014,
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0.013846655376255512,
0.007024010177701712,
0.005187822971493006,
-0.0977807492017746,
0.08336895704269409,
0.0120... |
34bf8e5c-b70a-49e0-9333-b8edbec56c31 | description: 'Documentation for Ssl X509'
slug: /operations/external-authenticators/ssl-x509
title: 'SSL X.509 certificate authentication'
doc_type: 'reference'
import SelfManaged from '@site/docs/_snippets/_self_managed_only_no_roadmap.md';
SSL 'strict' option
enables mandatory certificate validation for the ... | {"source_file": "ssl-x509.md"} | [
-0.06068911775946617,
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0.05690675973892212,
-0.041763126850128174,
0.129608154296875,
... |
8ce80af9-ab06-4bdb-8406-9b58ba8e06a0 | description: 'Guide to configuring LDAP authentication for ClickHouse'
slug: /operations/external-authenticators/ldap
title: 'LDAP'
doc_type: 'reference'
import SelfManaged from '@site/docs/_snippets/_self_managed_only_no_roadmap.md';
LDAP server can be used to authenticate ClickHouse users. There are two diffe... | {"source_file": "ldap.md"} | [
-0.021182971075177193,
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0.0540437325835228,
0.021541506052017212,
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-0.040328796952962875,
0.0690765306353569,
-0.054788392037153244,
0.05795887112617493,
0.0058... |
84cf864f-165e-43a7-b8b4-c9f4a8b02be1 | The resulting DN will be constructed by replacing all
{user_name}
and
{bind_dn}
substrings of the template with the actual user name and bind DN during the LDAP search.
scope
β Scope of the LDAP search.
Accepted values are:
base
,
one_level
,
children
,
subtree
(the default).
search_filter
β Template u... | {"source_file": "ldap.md"} | [
-0.10333120822906494,
0.05649230256676674,
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0.07251197099685669,
-0.034561507403850555,
0.022022871300578117,
-0.... |
c1f44cd8-820d-4be6-bc12-2ba04c03aecd | Note, that user
my_user
refers to
my_ldap_server
. This LDAP server must be configured in the main
config.xml
file as described previously.
When SQL-driven
Access Control and Account Management
is enabled, users that are authenticated by LDAP servers can also be created using the
CREATE USER
statement.
Que... | {"source_file": "ldap.md"} | [
0.0002076528180623427,
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0.02486470341682434,
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0.1375742405653,
0.05826101079583168,
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0.03496228903532028,
-0.05920955166220665,
0.1131645068526268,
-0.01727109774... |
86966b4c-b60c-4a7b-9c73-ca823c187dcb | role_mapping
β Section with LDAP search parameters and mapping rules.
When a user authenticates, while still bound to LDAP, an LDAP search is performed using
search_filter
and the name of the logged-in user. For each entry found during that search, the value of the specified attribute is extracted. For each attrib... | {"source_file": "ldap.md"} | [
-0.04982014000415802,
0.02115710824728012,
0.01847756840288639,
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0.05441533401608467,
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0.06261157989501953,
-0.01790415495634079,
0.0292393509298563,
-0.02526... |
446f13a6-cb1d-4c42-91db-6623f2af675c | description: 'Overview of external authentication methods supported by ClickHouse'
pagination_next: operations/external-authenticators/kerberos
sidebar_label: 'External User Authenticators and Directories'
sidebar_position: 48
slug: /operations/external-authenticators/
title: 'External User Authenticators and Directori... | {"source_file": "index.md"} | [
-0.08229926228523254,
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0.009853964671492577,
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0.002382125938311219,
0.04308600351214409,
0.... |
6e1fff8a-aec7-4e07-ac4f-5bc2a719d5ea | description: 'System table containing logging entries with information about
BACKUP
and
RESTORE
operations.'
keywords: ['system table', 'backup_log']
slug: /operations/system-tables/backup_log
title: 'system.backup_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_clo... | {"source_file": "backup_log.md"} | [
0.00854251254349947,
-0.0031008163932710886,
-0.03810868784785271,
-0.011034335941076279,
0.0321737639605999,
-0.08214343339204788,
0.028993993997573853,
0.04666523635387421,
-0.008876385167241096,
0.07436591386795044,
-0.001562759280204773,
-0.013684171251952648,
0.12789078056812286,
-0.1... |
99bada4c-3a6b-4e89-bcf8-b7a40d15fd3c | start_time: 2023-08-19 11:05:21
end_time: 1970-01-01 03:00:00
num_files: 0
total_size: 0
num_entries: 0
uncompressed_size: 0
compressed_size: 0
files_read: 0
bytes_read: 0
Row 2:
ββββββ
hostname: ... | {"source_file": "backup_log.md"} | [
-0.03763715922832489,
0.020121606066823006,
-0.03358595818281174,
0.02656189166009426,
0.05221930146217346,
-0.10394944250583649,
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0.004149490501731634,
0.028365416452288628,
0.06297316402196884,
-0.001985904760658741,
-0.05410144478082657,
0.0420154370367527,
-0.04154... |
25c2829a-bdeb-42f5-959b-52937eb5b9dc | This is essentially the same information that is written in the system table
system.backups
:
sql
SELECT * FROM system.backups ORDER BY start_time
response
ββidββββββββββββββββββββββββββββββββββββ¬βnameβββββββββββββββββββββββββββ¬βstatusββββββββββ¬βerrorββ¬ββββββββββstart_timeββ¬ββββββββββββend_timeββ¬βnum_filesββ¬βtotal... | {"source_file": "backup_log.md"} | [
-0.02181512862443924,
-0.004354013130068779,
-0.02923552133142948,
0.04726623371243477,
0.015265848487615585,
-0.019894424825906754,
-0.007604754064232111,
0.008007858879864216,
-0.008736487478017807,
0.06602936238050461,
0.02536003291606903,
0.008625064045190811,
0.06410480290651321,
-0.1... |
c6b136de-1a90-4108-96b8-dd5ded7d5bae | description: 'System table containing information about local files that are in the
queue to be sent to the shards.'
keywords: ['system table', 'distribution_queue']
slug: /operations/system-tables/distribution_queue
title: 'system.distribution_queue'
doc_type: 'reference'
Contains information about local files t... | {"source_file": "distribution_queue.md"} | [
0.01632474735379219,
-0.03360101580619812,
-0.0452192947268486,
0.042728278785943985,
0.024496937170624733,
-0.14160194993019104,
0.02668088674545288,
-0.021110031753778458,
0.040155742317438126,
0.07017744332551956,
0.04576980322599411,
0.0567510761320591,
0.03732357919216156,
-0.05206898... |
550ad1ec-bbe7-4c4e-bae3-54828f176772 | description: 'System table containing information about dictionaries'
keywords: ['system table', 'dictionaries']
slug: /operations/system-tables/dictionaries
title: 'system.dictionaries'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
Contains information about ... | {"source_file": "dictionaries.md"} | [
-0.0075950403697788715,
-0.04105490818619728,
-0.04397221654653549,
-0.07330498844385147,
0.011217036284506321,
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0.01173435803502798,
-0.029599009081721306,
-0.02514019049704075,
0.03083261102437973,
0.021901439875364304,
-0.02358338236808777,
0.10191051661968231,
-0.0... |
f53d605f-ff97-4797-a212-fa1ed81b7928 | loading_start_time
(
DateTime
) β Start time for loading the dictionary.
last_successful_update_time
(
DateTime
) β End time for loading or updating the dictionary. Helps to monitor some troubles with dictionary sources and investigate the causes.
error_count
(
UInt64
) β Number of errors since last successful l... | {"source_file": "dictionaries.md"} | [
-0.021769408136606216,
-0.044347673654556274,
-0.08395104855298996,
0.03978217765688896,
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0.022692011669278145,
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0.01859939657151699,
0.042380332946777344,
0.04354347661137581,
0.0017168261110782623,
0.07052288204431534,
-0.0... |
ec0dc2bb-5d15-45cb-b44e-3cf0f0e767fc | description: 'System table containing metadata of each table that the server knows
about.'
keywords: ['system table', 'tables']
slug: /operations/system-tables/tables
title: 'system.tables'
doc_type: 'reference'
system.tables
Contains metadata of each table that the server knows about.
Detached
tables are no... | {"source_file": "tables.md"} | [
0.0379975326359272,
-0.01187786553055048,
-0.12389308214187622,
0.024965446442365646,
0.057284463196992874,
-0.14153562486171722,
0.0442146472632885,
0.06420861929655075,
-0.011221524327993393,
0.06917327642440796,
0.06600414216518402,
-0.05178101360797882,
0.06362961232662201,
-0.07418915... |
4b4087cf-cb32-40d9-8826-604d4d83fb53 | If the table stores data on disk, returns used space on disk (i.e.Β compressed).
If the table stores data in memory, returns approximated number of used bytes in memory.
total_bytes_uncompressed
(
Nullable
(
UInt64
)) - Total number of uncompressed bytes (including indices and projections), if it's possible... | {"source_file": "tables.md"} | [
0.01389408390969038,
-0.0015290050068870187,
-0.11651306599378586,
0.06247411668300629,
0.028048476204276085,
-0.08703405410051346,
0.046317208558321,
0.021222922950983047,
-0.007126024924218655,
0.055051252245903015,
-0.017521817237138748,
0.015142909251153469,
0.06875036656856537,
-0.061... |
72f011ec-2b76-4d45-b03d-ded009cca550 | Row 2:
ββββββ
database: default
name: 53r93yleapyears
uuid: 00000000-0000-0000-0000-000000000000
engine: MergeTree
is_temporary: 0
data_paths: ['/var/lib/clickhouse/data/default/53r93yleapyears/']
metadata_pa... | {"source_file": "tables.md"} | [
0.02899702452123165,
-0.022384360432624817,
0.023801861330866814,
0.009151318110525608,
-0.021029869094491005,
-0.06560054421424866,
0.011381092481315136,
-0.014145325869321823,
-0.028203533962368965,
0.03555815666913986,
0.07644463330507278,
-0.06062210723757744,
0.002511951606720686,
-0.... |
63ac6710-bf85-460e-aa09-1c84e6e6c66d | description: 'System table containing information about resources residing on the
local server with one row for every resource.'
keywords: ['system table', 'resources']
slug: /operations/system-tables/resources
title: 'system.resources'
doc_type: 'reference'
system.resources
Contains information about
resource... | {"source_file": "resources.md"} | [
0.01624711975455284,
-0.025637924671173096,
-0.1262449324131012,
0.04556182771921158,
0.016742872074246407,
-0.1088365688920021,
0.085731141269207,
0.016435373574495316,
0.018055662512779236,
0.04883049428462982,
-0.007439646404236555,
-0.001788406865671277,
0.11487212777137756,
-0.0721535... |
6599b03c-ad6e-4848-bb94-aa9993e6a325 | description: 'System table containing profiling information on the processors level
(which can be found in
EXPLAIN PIPELINE
)'
keywords: ['system table', 'processors_profile_log', 'EXPLAIN PIPELINE']
slug: /operations/system-tables/processors_profile_log
title: 'system.processors_profile_log'
doc_type: 'reference'
... | {"source_file": "processors_profile_log.md"} | [
0.07594140619039536,
0.017158569768071175,
-0.07283614575862885,
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-0.019760478287935257,
0.070188008248806,
-0.0050906105898320675,
0.036123909056186676,
-0.03328417241573334,
-0.039358485490083694,
0.005549472291022539,
-0.08... |
1dab8319-3170-42c4-a98a-c2872ef8eb0a | Result:
text
ββnameβββββββββββββββββββββ¬βelapsed_usββ¬βinput_wait_elapsed_usββ¬βoutput_wait_elapsed_usββ
β ExpressionTransform β 1000497 β 2823 β 197 β
β LazyOutputFormat β 36 β 1002188 β 0 β
β LimitsCheckingTransform β ... | {"source_file": "processors_profile_log.md"} | [
-0.03554869443178177,
0.04103744029998779,
-0.029972366988658905,
0.0524151548743248,
0.000419384625274688,
0.024071164429187775,
-0.040634237229824066,
0.031587760895490646,
0.04007061570882797,
0.007398318499326706,
-0.0073051415383815765,
-0.07378428429365158,
-0.03170498088002205,
-0.1... |
eaaf2abb-a19a-4aab-a412-299d42368e7d | description: 'System table containing the role grants for users and roles.'
keywords: ['system table', 'role_grants']
slug: /operations/system-tables/role_grants
title: 'system.role_grants'
doc_type: 'reference'
system.role_grants
Contains the role grants for users and roles. To add entries to this table, use
GR... | {"source_file": "role_grants.md"} | [
-0.003207107074558735,
-0.06422576308250427,
-0.052112236618995667,
0.015816129744052887,
-0.05621977522969246,
-0.007090942934155464,
0.06820874661207199,
0.05732811242341995,
-0.13883604109287262,
-0.05760394409298897,
0.03461523354053497,
-0.06209033355116844,
0.0558134950697422,
0.0504... |
c460edb0-d929-4284-9ad0-e55f10cf04cc | description: 'System table containing information about parts of MergeTree'
keywords: ['system table', 'parts']
slug: /operations/system-tables/parts
title: 'system.parts'
doc_type: 'reference'
system.parts
Contains information about parts of
MergeTree
tables.
Each row describes one data part.
Columns:
... | {"source_file": "parts.md"} | [
-0.014448383823037148,
-0.008365750312805176,
-0.01785215176641941,
-0.03788899630308151,
-0.0025267554447054863,
-0.07778654247522354,
0.011897356249392033,
0.0997646301984787,
-0.029420912265777588,
-0.05609027296304703,
0.013390716165304184,
0.000758205249439925,
0.023872295394539833,
-... |
9f0b2ba3-4932-4a0c-b424-b1a7985a05ee | primary_key_size
(
UInt64
) β The amount of memory (in bytes) used by primary key values in the primary.idx/cidx file on disk.
marks_bytes
(
UInt64
) β The size of the file with marks.
secondary_indices_compressed_bytes
(
UInt64
) β Total size of compressed data for secondary indices in the data part. Al... | {"source_file": "parts.md"} | [
-0.034707024693489075,
0.03526463732123375,
-0.08839620649814606,
0.03586491942405701,
0.03482551500201225,
-0.02432173676788807,
-0.008417950943112373,
0.0837373286485672,
0.07059398293495178,
0.0182998888194561,
0.06858109682798386,
0.07923129945993423,
0.022380493581295013,
-0.069440953... |
701a5b5d-0b2a-45a0-ae7b-878bf8726585 | disk_name
(
String
) β Name of a disk that stores the data part.
hash_of_all_files
(
String
) β
sipHash128
of compressed files.
hash_of_uncompressed_files
(
String
) β
sipHash128
of uncompressed files (files with marks, index file etc.).
uncompressed_hash_of_compressed_files
(
String
) β
sipH... | {"source_file": "parts.md"} | [
-0.05431366711854935,
0.042860910296440125,
-0.061681076884269714,
-0.05563480034470558,
0.033609483391046524,
-0.07628518342971802,
-0.017358750104904175,
0.03405793756246567,
0.07226802408695221,
-0.0013176450738683343,
0.047184571623802185,
0.08604994416236877,
0.032719049602746964,
-0.... |
366ed6c8-b25f-4f3f-afe4-22014e96fd96 | bytes
(
UInt64
) β Alias for
bytes_on_disk
.
marks_size
(
UInt64
) β Alias for
marks_bytes
.
Example
sql
SELECT * FROM system.parts LIMIT 1 FORMAT Vertical;
text
Row 1:
ββββββ
partition: tuple()
name: all_1_4_1_6
part_type: ... | {"source_file": "parts.md"} | [
-0.004403496626764536,
0.00850577000528574,
-0.019839443266391754,
0.027458200231194496,
-0.0012835462111979723,
-0.057550497353076935,
0.024864640086889267,
0.059398241341114044,
0.02594098262488842,
-0.008543516509234905,
-0.0075532919727265835,
-0.006812219973653555,
0.02131425403058529,
... |
d179b5df-f6bb-4fa1-873a-fc8466b6e7b9 | description: 'System table containing information about the dependent views executed
when running a query, for example, the view type or the execution time.'
keywords: ['system table', 'query_views_log']
slug: /operations/system-tables/query_views_log
title: 'system.query_views_log'
doc_type: 'reference'
import S... | {"source_file": "query_views_log.md"} | [
0.029748689383268356,
-0.08218298107385635,
-0.041142236441373825,
0.03275061771273613,
0.020672675222158432,
-0.0884595587849617,
0.05556001514196396,
-0.08467981964349747,
0.048076335340738297,
0.06516128033399582,
0.0013407255755737424,
-0.014935673214495182,
0.07622609287500381,
-0.023... |
416fa7ff-ed33-496d-90da-bc29d134df08 | 'ExceptionWhileProcessing' = 4
β Exception during the view execution.
exception_code
(
Int32
) β Code of an exception.
exception
(
String
) β Exception message.
stack_trace
(
String
) β
Stack trace
. An empty string, if the query was completed successfully.
Example
Query:
sql
SELECT * FROM system.que... | {"source_file": "query_views_log.md"} | [
0.050382766872644424,
-0.049890413880348206,
-0.04507317766547203,
0.039657168090343475,
-0.00364808295853436,
-0.04979480057954788,
0.02735130675137043,
0.007917540147900581,
0.012868820689618587,
0.01885811798274517,
0.0504717081785202,
-0.09578561782836914,
0.003708441508933902,
-0.0587... |
36312f5b-0075-49e8-a8dd-f34241fa9f6b | description: 'System table containing logging entries with information about various
blob storage operations such as uploads and deletes.'
keywords: ['system table', 'blob_storage_log']
slug: /operations/system-tables/blob_storage_log
title: 'system.blob_storage_log'
doc_type: 'reference'
import SystemTableCloud ... | {"source_file": "blob_storage_log.md"} | [
0.046657174825668335,
-0.0022216748911887407,
-0.07146130502223969,
0.00034538996987976134,
0.06004336103796959,
-0.1076887995004654,
0.040328238159418106,
0.004873721394687891,
0.0627269372344017,
0.10576988756656647,
0.025336649268865585,
-0.007618554402142763,
0.09581196308135986,
-0.04... |
17864c07-e891-49de-b49c-6acac41c3aef | description: 'System table containing information about storage policies and volumes
which are defined in server configuration.'
keywords: ['system table', 'storage_policies']
slug: /operations/system-tables/storage_policies
title: 'system.storage_policies'
doc_type: 'reference'
system.storage_policies
Contains... | {"source_file": "storage_policies.md"} | [
-0.007808650843799114,
-0.03784296289086342,
-0.09867732971906662,
-0.044099580496549606,
-0.024994149804115295,
-0.07008832693099976,
0.0003943646443076432,
0.08287703990936279,
-0.013357692398130894,
0.0372815765440464,
0.048415809869766235,
0.0597793385386467,
0.06390392035245895,
-0.04... |
3590da25-08b4-4baf-a644-86468bfb6306 | description: 'System table containing information about existing data skipping indices
in all the tables.'
keywords: ['system table', 'data_skipping_indices']
slug: /operations/system-tables/data_skipping_indices
title: 'system.data_skipping_indices'
doc_type: 'reference'
Contains information about existing data ... | {"source_file": "data_skipping_indices.md"} | [
0.008022231049835682,
-0.00024151387333404273,
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0.07999344170093536,
0.04710878059267998,
-0.03054124303162098,
0.016709450632333755,
0.02343662828207016,
0.002431996399536729,
0.0628528743982315,
-0.0981... |
c93e84e3-1ac5-46a0-a603-34e3d050d29d | description: 'System table containing information about session settings for current
user.'
keywords: ['system table', 'settings']
slug: /operations/system-tables/settings
title: 'system.settings'
doc_type: 'reference'
system.settings
Contains information about session settings for current user.
Columns:
... | {"source_file": "settings.md"} | [
-0.0027911276556551456,
0.05132872611284256,
-0.08319184184074402,
0.0017519647954031825,
-0.1036793515086174,
-0.0013491158606484532,
0.05973236635327339,
0.1086406260728836,
-0.13898204267024994,
-0.008527888916432858,
0.000821391586214304,
-0.06525101512670517,
0.04191802442073822,
-0.0... |
a47dc10a-34ed-496b-bbc9-5c4586375d31 | Possible values:
Positive integer.
0 β Squashing disabled.
min: α΄Ία΅α΄Έα΄Έ
max: α΄Ία΅α΄Έα΄Έ
readonly: 0
type: UInt64
default: 268402944
alias_for:
is_obsolete: 0
tier: Production
Row 3:
ββββββ
name: min_insert_block_size_rows_for_materialized_views
value: 0
changed: ... | {"source_file": "settings.md"} | [
-0.020792553201317787,
-0.020385753363370895,
-0.11300160735845566,
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0.001670738565735519,
-0.06693395227193832,
0.020902423188090324,
0.012732826173305511,
0.0356367789208889,
0.02563273347914219,
-0.023864980787038803,
0.02194308489561081,
-0.032... |
1c490540-e4af-46c7-b642-f812eba44807 | description: 'Overview of what system tables are and why they are useful.'
keywords: ['system tables', 'overview']
sidebar_label: 'Overview'
sidebar_position: 52
slug: /operations/system-tables/overview
title: 'System Tables Overview'
doc_type: 'reference'
System tables overview {#system-tables-introduction}
Syst... | {"source_file": "overview.md"} | [
0.010980644263327122,
-0.08093180507421494,
-0.0677872896194458,
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0.018430370837450027,
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0.06736968457698822,
0.07094661146402359,
0.06181411072611809,
0.06352987885475159,
0.021761799231171608,
0.07269575446844101,
0.062255147844552994,
-0.06340010... |
3e90a6e3-a689-4277-ac99-260fa38c029e | Sources of System Metrics {#system-tables-sources-of-system-metrics}
For collecting system metrics ClickHouse server uses:
CAP_NET_ADMIN
capability.
procfs
(only in Linux).
procfs
If ClickHouse server does not have
CAP_NET_ADMIN
capability, it tries to fall back to
ProcfsMetricsProvider
.
ProcfsMetr... | {"source_file": "overview.md"} | [
-0.019379539415240288,
-0.12516465783119202,
-0.07913246750831604,
0.013850054703652859,
0.05195046216249466,
-0.08293874561786652,
0.061850160360336304,
0.01705339550971985,
0.04199382662773132,
0.024871855974197388,
0.03210671618580818,
-0.06981950253248215,
-0.006764459889382124,
-0.009... |
cc3a3efe-feef-4784-8d0d-10df9052f5a7 | For example, consider the
system.query_log
tables, which contain a row for each query executed by the node:
```sql
SHOW TABLES FROM system LIKE 'query_log%'
ββnameββββββββββ
β query_log β
β query_log_1 β
β query_log_10 β
β query_log_2 β
β query_log_3 β
β query_log_4 β
β query_log_5 β
β query_log_6 β
β qu... | {"source_file": "overview.md"} | [
0.04282471165060997,
-0.0560791902244091,
0.018084291368722916,
-0.004558908753097057,
0.044074445962905884,
-0.08422253280878067,
0.0201865267008543,
0.01488588098436594,
0.010431032627820969,
0.06987341493368149,
-0.01690269075334072,
0.049241818487644196,
0.022997433319687843,
-0.075478... |
925211d6-e468-4850-9185-4c8304699d2b | For example, consider the difference when querying the
query_log
table - often essential to analysis.
```sql
SELECT
hostname() AS host,
count()
FROM system.query_log
WHERE (event_time >= '2025-04-01 00:00:00') AND (event_time <= '2025-04-12 00:00:00')
GROUP BY host
ββhostβββββββββββββββββββββββββββ¬βcount(... | {"source_file": "overview.md"} | [
0.10223685950040817,
-0.014267142862081528,
0.03950905427336693,
0.11831429600715637,
0.061076778918504715,
-0.08906823396682739,
0.0022104608360677958,
-0.060783904045820236,
0.05925026163458824,
0.0329354852437973,
0.018362969160079956,
-0.04732763022184372,
0.015520886518061161,
-0.0306... |
49717557-c899-4402-bdc5-4aca79ccc884 | description: 'System table containing descriptions of table engines supported by the
server and the features they support.'
keywords: ['system table', 'table_engines']
slug: /operations/system-tables/table_engines
title: 'system.table_engines'
doc_type: 'reference'
system.table_engines
Contains description of t... | {"source_file": "table_engines.md"} | [
-0.050571199506521225,
-0.05072212591767311,
-0.05545814707875252,
0.024528902024030685,
-0.030675673857331276,
-0.0644097551703453,
-0.0348205529153347,
0.03259855508804321,
-0.07278916239738464,
0.0035277768038213253,
0.01997026987373829,
0.011091125197708607,
0.029295997694134712,
-0.05... |
1f273ec5-4d1b-4d3d-8ec6-950f7bd19972 | description: 'System table used for implementing the
SHOW PROCESSLIST
query.'
keywords: ['system table', 'processes']
slug: /operations/system-tables/processes
title: 'system.processes'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.processes
This sy... | {"source_file": "processes.md"} | [
-0.01007907185703516,
-0.04684390500187874,
-0.09873511642217636,
-0.055099792778491974,
-0.010400934144854546,
-0.09369833022356033,
0.0626446083188057,
0.013679486699402332,
0.0053563970141112804,
0.07738320529460907,
-0.0383642353117466,
0.04158662632107735,
0.10280687361955643,
-0.0830... |
d2f8fa28-4440-45fd-97f9-4dd334dc6f2b | forwarded_for
(
String
) β HTTP header X-Forwarded-For passed in the HTTP query.
quota_key
(
String
) β The quota key specified in the quotas setting (see keyed).
distributed_depth
(
UInt64
) β The number of times query was retransmitted between server nodes internally.
elapsed
(
Float64
) β The time in secon... | {"source_file": "processes.md"} | [
-0.018672436475753784,
-0.012642021290957928,
-0.0666060596704483,
0.03742954879999161,
-0.04409646987915039,
-0.09081210196018219,
-0.0379333570599556,
0.049828626215457916,
0.04905414953827858,
0.09010007232427597,
-0.026689641177654266,
0.05351484939455986,
0.0992225632071495,
-0.114473... |
1fbb36e4-cf94-476d-98d9-26256385239b | current_database
(
String
) β The name of the current database.
sql
SELECT * FROM system.processes LIMIT 10 FORMAT Vertical;
```response
Row 1:
ββββββ
is_initial_query: 1
user: default
query_id: 35a360fa-3743-441d-8e1f-228c938268da
address: ::ffff:172.23.0.1
port: ... | {"source_file": "processes.md"} | [
0.014613393694162369,
-0.032608650624752045,
-0.09645246714353561,
-0.015249493531882763,
-0.0753747820854187,
-0.10524812340736389,
-0.0003421020810492337,
-0.006228293292224407,
-0.03434330224990845,
0.026014169678092003,
0.017698902636766434,
-0.04533575847744942,
0.02390170842409134,
-... |
471b2687-6a4c-4a4c-bf2b-807ccfd8de78 | description: 'System table containing information about columns in all tables'
keywords: ['system table', 'columns']
slug: /operations/system-tables/columns
title: 'system.columns'
doc_type: 'reference'
Contains information about columns in all tables.
You can use this table to get information similar to the
DES... | {"source_file": "columns.md"} | [
0.033920180052518845,
0.008252611383795738,
-0.130684956908226,
0.045569755136966705,
0.0220026932656765,
-0.09634140878915787,
0.05043967813253403,
0.0851326733827591,
0.02067146822810173,
0.0688779279589653,
0.002334182383492589,
-0.0176265649497509,
0.06672993302345276,
-0.0794779211282... |
7b6f0de6-f81e-49c1-b91d-83f92cef1c2e | datetime_precision
(
Nullable(UInt64)
) β Decimal precision of DateTime64 data type. For other data types, the NULL value is returned.
serialization_hint
(
Nullable(String)
) β A hint for column to choose serialization on inserts according to statistics.
statistics
(
String
) β The types of statistics created in... | {"source_file": "columns.md"} | [
0.018862398341298103,
-0.0074496278539299965,
-0.1305318921804428,
0.030095046386122704,
-0.05340714380145073,
-0.020486202090978622,
-0.03250158950686455,
0.08220543712377548,
-0.0380265936255455,
0.04857601597905159,
0.04171336442232132,
-0.07606552541255951,
0.011617244221270084,
-0.063... |
5afd5b78-931e-49a9-bd0a-332111b6d410 | description: 'System table containing formation about quota usage by the current user
such as how much of the quota is used and how much is left.'
keywords: ['system table', 'quota_usage']
slug: /operations/system-tables/quota_usage
title: 'system.quota_usage'
doc_type: 'reference'
import SystemTableCloud from '@... | {"source_file": "quota_usage.md"} | [
0.0036781509406864643,
0.004679418168962002,
-0.10208908468484879,
-0.006969887763261795,
-0.013383759185671806,
-0.0700288787484169,
0.04870133474469185,
0.07133305072784424,
-0.011526099406182766,
0.08938058465719223,
-0.041213445365428925,
-0.05082351341843605,
0.09439461678266525,
-0.0... |
3cd7c81c-a4a5-49dd-ba38-9563dfc426c6 | execution_time
(
Nullable(Float64)
) β The current total amount of time (in nanoseconds) spent to execute queries within the current period of time
max_execution_time
(
Nullable(Float64)
) β The maximum amount of time (in nanoseconds) allowed for all queries to execute within the specified period of time
written_... | {"source_file": "quota_usage.md"} | [
-0.03417360037565231,
-0.014452802017331123,
-0.11268382519483566,
0.005057245958596468,
-0.032930538058280945,
-0.008995686657726765,
-0.02188335731625557,
0.06111377850174904,
0.004714298527687788,
-0.011349798180162907,
0.012812764383852482,
0.046509772539138794,
0.07735075801610947,
-0... |
174a40b6-0473-4b51-aebe-405d07664b7e | description: 'System table containing information about disks defined in the server
configuration'
keywords: ['system table', 'disks']
slug: /operations/system-tables/disks
title: 'system.disks'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
Contains informat... | {"source_file": "disks.md"} | [
0.009424084797501564,
-0.03225453197956085,
-0.07616117596626282,
-0.02042335830628872,
0.06887172907590866,
-0.05469981208443642,
0.01896805502474308,
0.052208561450242996,
0.02927718125283718,
0.08790339529514313,
0.03643818199634552,
0.035837143659591675,
0.10977679491043091,
-0.1133462... |
8702d14a-ee04-40ed-94ba-9978abcdf08b | description: 'System table containing information about parameters
graphite_rollup
which are used in tables with
GraphiteMergeTree
type engines.'
keywords: ['system table', 'graphite_retentions']
slug: /operations/system-tables/graphite_retentions
title: 'system.graphite_retentions'
doc_type: 'reference'
Cont... | {"source_file": "graphite_retentions.md"} | [
-0.06448518484830856,
0.05317525938153267,
-0.09957212209701538,
-0.008707207627594471,
0.01875545084476471,
-0.04449756443500519,
0.04224691912531853,
0.04012679681181908,
-0.07992936670780182,
0.057298049330711365,
0.04579203948378563,
-0.028735464438796043,
0.04015076160430908,
-0.00717... |
239e0426-1bba-4d37-9667-38868cd744aa | description: 'System table containing formation about quota usage by all users.'
keywords: ['system table', 'quotas_usage', 'quota']
slug: /operations/system-tables/quotas_usage
title: 'system.quotas_usage'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_cloud.md';
system.qu... | {"source_file": "quotas_usage.md"} | [
0.008061263710260391,
-0.002707027131691575,
-0.0940207913517952,
-0.01056026853621006,
-0.012410197407007217,
-0.06415356695652008,
0.0503777414560318,
0.0542663037776947,
-0.009963939897716045,
0.08757365494966507,
-0.050592806190252304,
-0.04796016961336136,
0.08995649963617325,
-0.0615... |
0b11fdc4-b2db-4c66-9523-87a4e8739dbb | execution_time
(
Nullable(Float64)
) β The current total amount of time (in nanoseconds) spent to execute queries within the current period of time
max_execution_time
(
Nullable(Float64)
) β The maximum amount of time (in nanoseconds) allowed for all queries to execute within the specified period of time
written_... | {"source_file": "quotas_usage.md"} | [
-0.03417360037565231,
-0.014452802017331123,
-0.11268382519483566,
0.005057245958596468,
-0.032930538058280945,
-0.008995686657726765,
-0.02188335731625557,
0.06111377850174904,
0.004714298527687788,
-0.011349798180162907,
0.012812764383852482,
0.046509772539138794,
0.07735075801610947,
-0... |
61c3b374-6a40-4412-aec5-321f5d716eef | description: 'System table containing information about columns in projection parts for tables of the MergeTree family'
keywords: ['system table', 'projection_parts_columns']
slug: /operations/system-tables/projection_parts_columns
title: 'system.projection_parts_columns'
doc_type: 'reference'
system.projection_par... | {"source_file": "projection_parts_columns.md"} | [
-0.0004955393960699439,
-0.01499329786747694,
-0.07145919650793076,
-0.005113011226058006,
0.06786393374204636,
-0.14670002460479736,
-0.013884259387850761,
0.08621440082788467,
-0.052935607731342316,
0.0292799212038517,
0.032190121710300446,
-0.005048457533121109,
0.06164698675274849,
-0.... |
5d779a70-ff53-4c90-8c5d-0f41ac59232d | partition_id
(
String
) β ID of the partition.
min_block_number
(
Int64
) β The minimum number of data parts that make up the current part after merging.
max_block_number
(
Int64
) β The maximum number of data parts that make up the current part after merging.
level
(
UInt32
) β Depth of the merge tree. Zero ... | {"source_file": "projection_parts_columns.md"} | [
0.011879045516252518,
-0.022981412708759308,
-0.11317568272352219,
-0.01140125934034586,
-0.024289263412356377,
-0.10210229456424713,
0.00006711910100420937,
0.12521269917488098,
-0.004783778917044401,
-0.04727252200245857,
0.050072114914655685,
0.03313814848661423,
0.0501665435731411,
-0.... |
8b84f888-d071-4560-ac55-67800cd30314 | description: 'System table containing information about async inserts. Each entry
represents an insert query buffered into an async insert query.'
keywords: ['system table', 'asynchronous_insert_log']
slug: /operations/system-tables/asynchronous_insert_log
title: 'system.asynchronous_insert_log'
doc_type: 'reference'... | {"source_file": "asynchronous_insert_log.md"} | [
0.015519872307777405,
-0.030692802742123604,
-0.0709976777434349,
0.05303463339805603,
0.0044860513880848885,
-0.103928342461586,
0.027389591559767723,
-0.0757305771112442,
0.06913968175649643,
0.0789850726723671,
0.04199385643005371,
0.00685513811185956,
0.11479359865188599,
-0.0806278362... |
38765812-b316-47e0-9c65-9f008804746f | See Also
system.query_log
β Description of the
query_log
system table which contains common information about queries execution.
system.asynchronous_inserts
β This table contains information about pending asynchronous inserts in queue. | {"source_file": "asynchronous_insert_log.md"} | [
0.015491834841668606,
-0.0694384053349495,
-0.12238206714391708,
0.08788617700338364,
-0.026948722079396248,
-0.0983782485127449,
0.11401468515396118,
-0.029552720487117767,
0.024424085393548012,
0.04808786138892174,
0.01162926759570837,
0.05236385390162468,
0.05062064528465271,
-0.0979878... |
74f62428-bab6-4c2d-ab90-0cc82c668f49 | description: 'System table containing information about trace spans for executed queries.'
keywords: ['system table', 'opentelemetry_span_log']
slug: /operations/system-tables/opentelemetry_span_log
title: 'system.opentelemetry_span_log'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_syst... | {"source_file": "opentelemetry_span_log.md"} | [
-0.0012759952805936337,
-0.029116053134202957,
-0.07134117931127548,
0.0367480143904686,
0.04501965641975403,
-0.1360250860452652,
0.02461211569607258,
0.004895288497209549,
0.004326163325458765,
0.04646917060017586,
0.017046285793185234,
0.019501570612192154,
0.07421975582838058,
-0.12078... |
1cce0aa3-4ad9-4759-b152-0dceb86e2f43 | description: 'System table containing information about the settings of S3Queue tables.
Available from server version
24.10
.'
keywords: ['system table', 's3_queue_settings']
slug: /operations/system-tables/s3_queue_settings
title: 'system.s3_queue_settings'
doc_type: 'reference'
system.s3_queue_settings
Conta... | {"source_file": "s3_queue_settings.md"} | [
-0.02599368803203106,
-0.04287011921405792,
-0.1210925430059433,
0.012986619956791401,
-0.08913513273000717,
-0.014661534689366817,
0.07884609699249268,
-0.0136481411755085,
-0.06931177526712418,
0.008858387358486652,
0.0046308995224535465,
-0.05313031002879143,
0.08247058838605881,
-0.080... |
acb491d4-14b4-4aa4-8769-a64f8a990270 | description: 'System table which shows the content of the query condition cache.'
keywords: ['system table', 'query_condition_cache']
slug: /operations/system-tables/query_condition_cache
title: 'system.query_condition_cache'
doc_type: 'reference'
import SystemTableCloud from '@site/docs/_snippets/_system_table_clo... | {"source_file": "query_condition_cache.md"} | [
0.005379849579185247,
0.041011303663253784,
-0.058863408863544464,
-0.041742563247680664,
-0.0021226394455879927,
-0.10438096523284912,
0.06461838632822037,
0.0018560478929430246,
0.006148197688162327,
0.05677010864019394,
-0.021186277270317078,
-0.01501036249101162,
0.1051713153719902,
-0... |
14d29301-8188-4520-94c3-ecccee96356c | description: 'System table containing information about metadata files read from Delta Lake tables. Each entry
represents a root metadata JSON file.'
keywords: ['system table', 'delta_lake_metadata_log']
slug: /operations/system-tables/delta_lake_metadata_log
title: 'system.delta_lake_metadata_log'
doc_type: 'referen... | {"source_file": "delta_metadata_log.md"} | [
-0.006040162872523069,
-0.01834970898926258,
-0.07001710683107376,
-0.057791899889707565,
0.06285659968852997,
-0.10410260409116745,
0.04357662424445152,
0.040454570204019547,
-0.03164101764559746,
0.042525049299001694,
0.02791755087673664,
-0.01771141029894352,
0.02906995825469494,
-0.083... |
4b7d7dfc-05db-409e-9699-0d4c7f289bb0 | description: 'System table useful for C++ experts and ClickHouse engineers containing
information for introspection of the
clickhouse
binary.'
keywords: ['system table', 'symbols']
slug: /operations/system-tables/symbols
title: 'system.symbols'
doc_type: 'reference'
Contains information for introspection of
cl... | {"source_file": "symbols.md"} | [
0.02739975042641163,
-0.018941182643175125,
-0.05977405235171318,
0.0017103306017816067,
-0.06937894970178604,
-0.08737927675247192,
0.06966197490692139,
0.044680193066596985,
-0.0201036985963583,
0.00044425157830119133,
-0.02025357447564602,
-0.03614864870905876,
0.06897131353616714,
-0.0... |
ed6695d7-09e0-4133-9409-a6714d97abbe | description: 'System table containing information about distributed ddl queries (queries
using the ON CLUSTER clause) that were executed on a cluster.'
keywords: ['system table', 'distributed_ddl_queue']
slug: /operations/system-tables/distributed_ddl_queue
title: 'system.distributed_ddl_queue'
doc_type: 'reference'
... | {"source_file": "distributed_ddl_queue.md"} | [
0.008113501593470573,
-0.05805471912026405,
-0.07614777237176895,
0.033363014459609985,
-0.026232074946165085,
-0.1175890564918518,
0.009294417686760426,
-0.04145314544439316,
-0.05329018831253052,
0.007372553925961256,
0.03022715635597706,
-0.020660603418946266,
0.052791062742471695,
-0.1... |
279aa5a0-5f55-432b-ba20-40d5753e8ad9 | description: 'System database providing an almost standardized DBMS-agnostic view
on metadata of database objects.'
keywords: ['system database', 'information_schema']
slug: /operations/system-tables/information_schema
title: 'INFORMATION_SCHEMA'
doc_type: 'reference'
INFORMATION_SCHEMA
(or:
information_schema
... | {"source_file": "information_schema.md"} | [
0.028364822268486023,
-0.07744956761598587,
-0.09829491376876831,
-0.016120264306664467,
0.0018872709479182959,
-0.06775961816310883,
0.04704541712999344,
0.041905295103788376,
-0.033596351742744446,
0.046971891075372696,
-0.012619499117136002,
-0.004540326073765755,
0.07516735792160034,
0... |
da1a1e9e-b647-45ea-8898-b616c50b9734 | Result:
text
Row 1:
ββββββ
table_catalog: default
table_schema: default
table_name: describe_example
column_name: id
ordinal_position: 1
column_default:
is_nullable: 0
data_type: UInt64
character_maximum_length: α΄Ία΅α΄Έα΄Έ
character_octet... | {"source_file": "information_schema.md"} | [
0.08175261318683624,
-0.0500146821141243,
-0.15226835012435913,
0.012094794772565365,
-0.04171619936823845,
-0.048450782895088196,
0.012854089960455894,
0.03557003289461136,
-0.07421021908521652,
0.0068171084858477116,
0.09486526995897293,
-0.02199370600283146,
0.046128563582897186,
-0.074... |
51c15e77-2888-486e-b1b4-77a44ffb2855 | table_collation
(
Nullable
(
String
)) β The table default collation. Always
utf8mb4_0900_ai_ci
.
table_comment
(
Nullable
(
String
)) β The comment used when creating the table.
Example
Query:
sql
SELECT table_catalog,
table_schema,
table_name,
table_type,
table_collation, ... | {"source_file": "information_schema.md"} | [
0.015808667987585068,
-0.07692530751228333,
-0.1304895132780075,
0.046099953353405,
-0.029774384573101997,
-0.03742539510130882,
0.05870882794260979,
0.04337708279490471,
-0.00048074754886329174,
0.009691843762993813,
0.0683528482913971,
-0.018577417358756065,
0.07499038428068161,
-0.06490... |
04e4947c-0aac-4df4-8260-9d34bb8823e3 | constraint_name
(
Nullable
(
String
)) β The name of the constraint.
table_catalog
(
String
) β Currently unused. Always
def
.
table_schema
(
String
) β The name of the schema (database) to which the table belongs.
table_name
(
String
) β The name of the table that has the constraint.
column_name
(
Nullab... | {"source_file": "information_schema.md"} | [
0.03702115640044212,
-0.04228284955024719,
-0.09134061634540558,
0.02947424352169037,
-0.012479295954108238,
-0.00232280557975173,
0.03249768540263176,
-0.013231789693236351,
-0.09250857681035995,
-0.006084332708269358,
0.0738958865404129,
-0.039007823914289474,
0.08178442716598511,
-0.049... |
b5fc8485-6f7e-4da1-b809-7ad37236e8fe | Columns:
table_catalog
(
String
) β Currently unused.
table_schema
(
String
) β Currently unused.
table_name
(
String
) β Currently unused.
non_unique
(
Int32
) β Currently unused.
index_schema
(
String
) β Currently unused.
index_name
(
Nullable
(
String
)) β Currently unused.
seq_in_index
(
UIn... | {"source_file": "information_schema.md"} | [
0.033616650849580765,
-0.034400034695863724,
-0.09366723150014877,
0.08495525270700455,
0.06939690560102463,
-0.002872670302167535,
0.025649890303611755,
-0.0025382728781551123,
-0.018664097413420677,
0.013257521204650402,
0.05848905071616173,
-0.013002587482333183,
0.04887680336833,
-0.05... |
e2d08868-bc66-4865-b013-75d888784aea | description: 'System table containing information about and status of recent asynchronous
jobs (e.g. for tables which are loading). The table contains a row for every job.'
keywords: ['system table', 'asynchronous_loader']
slug: /operations/system-tables/asynchronous_loader
title: 'system.asynchronous_loader'
doc_typ... | {"source_file": "asynchronous_loader.md"} | [
-0.04317479580640793,
0.002643980085849762,
-0.08830934017896652,
0.053267836570739746,
0.006616802886128426,
-0.06209975853562355,
0.020182721316814423,
-0.05814822018146515,
-0.01542599219828844,
0.045481808483600616,
-0.041901081800460815,
0.035860102623701096,
0.06052103266119957,
-0.0... |
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