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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...
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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_...
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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...
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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_...
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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 ....
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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...
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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 ...
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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...
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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 ...
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bcd8188e-2b85-4228-8d54-a2e4818722c6
| Setting | Description ...
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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. ...
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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 | |---------------------...
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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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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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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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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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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...
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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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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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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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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 ...
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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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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"}
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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"}
[ 0.06083206087350845, -0.0569211021065712, -0.06496495753526688, -0.0284989383071661, -0.017690371721982956, -0.03853809833526611, -0.041293252259492874, -0.018882745876908302, -0.06205925717949867, 0.04286295175552368, 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 – If specified, multiple queries separated by semicolons can be listed after the --query option. Fo...
{"source_file": "clickhouse-local.md"}
[ 0.01724238507449627, -0.03907330706715584, -0.07481104135513306, 0.04238390550017357, -0.051852524280548096, -0.03500472009181976, 0.07926175743341446, 0.061233483254909515, -0.012436473742127419, 0.05220779776573181, 0.00020052208856213838, -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"}
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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, -0.03477838262915611, -0.08255269378423691, 0.068026602268219, -0.08453735709190369, -0.11651265621185303, -0.0013396949507296085, 0.06842324882745743, -0.00013656057126354426, -0.002163978759199381, -0.09829682111740112, 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"}
[ -0.04297176003456116, 0.00012085487833246589, -0.07210134714841843, -0.04907890781760216, -0.06749176979064941, -0.07395033538341522, 0.00922737643122673, 0.031334444880485535, -0.05928482860326767, 0.0018651490099728107, 0.06442437320947647, -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"}
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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, -0.050911471247673035, -0.056242991238832474, -0.07935886830091476, -0.02555161714553833, 0.040590837597846985, -0.002050527138635516, -0.07934705913066864, 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"}
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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, 0.007438689935952425, -0.024418262764811516, 0.008516160771250725, -0.0021136468276381493, -0.04279641807079315, 0.022646630182862282, -0.0008579045534133911, -0.0024680746719241142, -0.10006643831729889, 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"}
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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, -0.0007799926097504795, -0.0014347574906423688, -0.06263453513383865, -0.0596717894077301, 0.08403991162776947, -0.00266062468290329, -0.04180356115102768, -0.07644630968570709, 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"}
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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"}
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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"}
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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: ────── hostname: ...
{"source_file": "backup_log.md"}
[ -0.03763715922832489, 0.020121606066823006, -0.03358595818281174, 0.02656189166009426, 0.05221930146217346, -0.10394944250583649, -0.03544297069311142, 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 β”Œβ”€id───────────────────────────────────┬─name──────────────────────────┬─status─────────┬─error─┬──────────start_time─┬────────────end_time─┬─num_files─┬─total...
{"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"}
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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"}
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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"}
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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"}
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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: ────── 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, 0.03967678174376488, 0.018015705049037933, -0.14024679362773895, -0.019760478287935257, 0.070188008248806, -0.0050906105898320675, 0.036123909056186676, -0.03328417241573334, -0.039358485490083694, 0.005549472291022539, -0.08...
1dab8319-3170-42c4-a98a-c2872ef8eb0a
Result: text β”Œβ”€name────────────────────┬─elapsed_us─┬─input_wait_elapsed_us─┬─output_wait_elapsed_us─┐ 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"}
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9f0b2ba3-4932-4a0c-b424-b1a7985a05ee
primary_key_size ( UInt64 ) – The amount of memory (in bytes) used by primary key values in the primary.idx/cidx file on disk. marks_bytes ( UInt64 ) – The size of the file with marks. secondary_indices_compressed_bytes ( UInt64 ) – 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 ) – Name of a disk that stores the data part. hash_of_all_files ( String ) – sipHash128 of compressed files. hash_of_uncompressed_files ( String ) – sipHash128 of uncompressed files (files with marks, index file etc.). uncompressed_hash_of_compressed_files ( String ) – 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 ) – Alias for bytes_on_disk . marks_size ( UInt64 ) – Alias for marks_bytes . Example sql SELECT * FROM system.parts LIMIT 1 FORMAT Vertical; text Row 1: ────── 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, -0.037162914872169495, 0.06980450451374054, 0.01105544250458479, -0.12703648209571838, 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: ᴺᡁᴸᴸ max: ᴺᡁᴸᴸ readonly: 0 type: UInt64 default: 268402944 alias_for: is_obsolete: 0 tier: Production Row 3: ────── name: min_insert_block_size_rows_for_materialized_views value: 0 changed: ...
{"source_file": "settings.md"}
[ -0.020792553201317787, -0.020385753363370895, -0.11300160735845566, 0.04719245433807373, -0.04930587857961655, 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, -0.008670482784509659, 0.018430370837450027, -0.097224161028862, 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%' β”Œβ”€name─────────┐ 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 β”Œβ”€host──────────────────────────┬─count(...
{"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: ────── 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: ────── 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: ᴺᡁᴸᴸ 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...