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d90e447a-fab7-4099-8c13-f360644a82e9
If your production uses complex features like replication, distributed tables and cascading materialized views, make sure they are configured similarly in pre-production. There's a trade-off on using the roughly same number of servers or VMs in pre-production as in production but of smaller size, or much less of them...
{"source_file": "production.md"}
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c509bae1-9c37-44d9-a2b0-2c17a48a0546
stable lts (long-term support) Here is some guidance on how to choose between them: stable is the kind of package we recommend by default. They are released roughly monthly (and thus provide new features with reasonable delay) and three latest stable releases are supported in terms of diagnostics and backpo...
{"source_file": "production.md"}
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69d27097-ced9-4c3c-b537-4a41c72dcba9
slug: /faq/operations/ sidebar_position: 3 sidebar_label: 'Question about operating ClickHouse servers and clusters' title: 'Question about operating ClickHouse servers and clusters' description: 'Landing page for questions about operating ClickHouse servers and clusters' doc_type: 'landing-page' keywords: ['operations...
{"source_file": "index.md"}
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c5a44915-b627-41e5-9821-8ab1d6f8ca1f
slug: /faq/operations/multi-region-replication title: 'Does ClickHouse support multi-region replication?' toc_hidden: true toc_priority: 30 description: 'This page answers whether ClickHouse supports multi-region replication' doc_type: 'reference' keywords: ['multi-region', 'replication', 'geo-distributed', 'distribute...
{"source_file": "multi-region-replication.md"}
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5918519f-942f-448e-84d9-594da8600f97
slug: /faq/operations/delete-old-data title: 'Is it possible to delete old records from a ClickHouse table?' toc_hidden: true toc_priority: 20 description: 'This page answers the question of whether it is possible to delete old records from a ClickHouse table' doc_type: 'reference' keywords: ['delete data', 'TTL', 'dat...
{"source_file": "delete-old-data.md"}
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464530a6-589f-48c8-aeb5-0bfd167e7710
slug: /faq/operations/deploy-separate-storage-and-compute title: 'Is it possible to deploy ClickHouse with separate storage and compute?' sidebar_label: 'Is it possible to deploy ClickHouse with separate storage and compute?' toc_hidden: true toc_priority: 20 description: 'This page provides an answer as to whether it ...
{"source_file": "separate_storage.md"}
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dad0e808-64a4-47e3-990e-3965d1d2fac1
slug: /faq/use-cases/key-value title: 'Can I use ClickHouse as a key-value storage?' toc_hidden: true toc_priority: 101 description: 'Answers the frequently asked question of whether or not ClickHouse can be used as a key-value storage?' doc_type: 'reference' keywords: ['key-value', 'data model', 'use case', 'schema de...
{"source_file": "key-value.md"}
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c75a6d94-c579-47ba-895c-f4db3604ac12
slug: /faq/use-cases/ sidebar_position: 2 sidebar_label: 'Questions about ClickHouse use cases' title: 'Questions About ClickHouse Use Cases' description: 'Landing page listing common questions about ClickHouse use cases' keywords: ['ClickHouse use cases', 'time-series database', 'key-value storage', 'database applicat...
{"source_file": "index.md"}
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d4e706c5-5fd8-4b13-830d-8d7e05127a8f
slug: /faq/use-cases/time-series title: 'Can I use ClickHouse as a time-series database?' toc_hidden: true toc_priority: 101 description: 'Page describing how to use ClickHouse as a time-series database' doc_type: 'guide' keywords: ['time series', 'temporal data', 'use case', 'time-based analytics', 'timeseries'] C...
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03eeab77-a202-490c-9b5d-404fbfa53a78
description: 'Details alternative backup or restore methods' sidebar_label: 'Alternative methods' slug: /operations/backup/alternative_methods title: 'Alternative backup or restore methods' doc_type: 'reference' Alternative backup methods ClickHouse stores data on disk, and there are many ways to back up disks. ...
{"source_file": "04_alternative_methods.md"}
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c998f136-38cf-4d80-8267-10e0bbcf00cf
description: 'Details backup/restore to or from a local disk' sidebar_label: 'Local disk / S3 disk' slug: /operations/backup/disk title: 'Backup and Restore in ClickHouse' doc_type: 'guide' import GenericSettings from '@site/docs/operations_/backup_restore/ snippets/_generic_settings.md'; import S3Settings from '@s...
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58961084-5c0a-4b31-b4d3-804fdc6b2adb
Backup and restore a table {#backup-and-restore-a-table} To backup the table you can run: sql title="Query" BACKUP TABLE test_db.test_table TO Disk('backups', '1.zip') response title="Response" ┌─id───────────────────────────────────┬─status─────────┐ 1. │ 065a8baf-9db7-4393-9c3f-ba04d1e76bcd │ BACKUP_CREATE...
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7f1aa33a-04bf-4d46-9e5f-e289532e2819
Securing a backup {#assign-a-password-to-the-backup} Backups written to disk can have a password applied to the file. The password can be specified using the password setting: sql BACKUP TABLE test_db.test_table TO Disk('backups', 'password-protected.zip') SETTINGS password='qwerty' To restore a password-protec...
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f88bf84a-8dc4-456c-a5be-6704951c506e
sql BACKUP TABLE test_db.partitioned PARTITIONS '1', '4' TO Disk('backups', 'partitioned.zip') Run the following command to restore partitions 1 and 4: sql RESTORE TABLE test_db.partitioned PARTITIONS '1', '4' FROM Disk('backups', 'partitioned.zip') SETTINGS allow_non_empty_tables=true
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e72e63d9-cb14-4cf2-a9a8-2103b9fc9db0
description: 'Overview of ClickHouse backup and restore' sidebar_label: 'S3 endpoint' slug: /operations/backup/s3_endpoint title: 'Backup and restore to/from an S3 endpoint' doc_type: 'guide' import Syntax from '@site/docs/operations_/backup_restore/_snippets/_syntax.md'; BACKUP / RESTORE to or from an S3 endpoin...
{"source_file": "02_s3_endpoint.md"}
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72e2379e-6279-490e-9110-b7b5d700a7f3
sql INSERT INTO test_db.test_table SELECT * FROM generateRandom('key Int, value String, array Array(String)') LIMIT 100 Take an incremental backup {#take-an-incremental-backup} This backup command is similar to the base backup, but adds SETTINGS base_backup and the location of the base backup. Note that the dest...
{"source_file": "02_s3_endpoint.md"}
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eb5c2e2c-c090-4b75-b0e4-889fd2d16a81
description: 'Details backup/restore to or from an Azure Blob Storage endpoint' sidebar_label: 'AzureBlobStorage' slug: /operations/backup/azure title: 'Backup and restore to/from Azure Blob Storage' doc_type: 'guide' import Syntax from '@site/docs/operations_/backup_restore/_snippets/_syntax.md'; BACKUP/RESTORE ...
{"source_file": "03_azure_blob_storage.md"}
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cc8817d7-21c7-4e51-9bef-1599ce4fb278
description: 'Overview of ClickHouse backup and restore' sidebar_label: 'Overview' slug: /operations/backup/overview title: 'Backup and Restore in ClickHouse' doc_type: 'reference' import GenericSettings from '@site/docs/operations_/backup_restore/ snippets/_generic_settings.md'; import Syntax from '@site/docs/oper...
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0497ef1d-44e9-40e5-82d8-cdfa501cc083
The following pages detail the various backup and restore methods available in ClickHouse: | Page | Description | |---------------------------------------------------------------------|-----------------------...
{"source_file": "00_overview.md"}
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379f4ad3-92c1-40a0-b610-48ba7fcf7c9e
To disallow concurrent backup/restore, you can use these settings respectively: xml <clickhouse> <backups> <allow_concurrent_backups>false</allow_concurrent_backups> <allow_concurrent_restores>false</allow_concurrent_restores> </backups> </clickhouse> The default value for both is true, so b...
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c1b2fd5b-d5b0-4473-a786-baef661dbf33
General syntax {#syntax} Command summary {#command-summary} Each of the commands above is detailed below:
{"source_file": "00_overview.md"}
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261cb088-1b1b-41cb-8cda-cee1d7f07077
| Command | Description | |------------------------------------------------------------------------|------------------------...
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b7ad6cb6-23c1-4bdf-a066-ef633335c8e6
ALL was only applicable to the RESTORE command. | | [EXCEPT {TABLES\|DATABASES}...] | Exclude specific tables or databases when using ALL | | [ON CLUSTER 'cluster_name'] ...
{"source_file": "00_overview.md"}
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d630333b-e25a-4e82-b7d7-8e3f38345333
Settings {#settings} Generic backup/restore settings S3 specific settings Azure specific settings Administration and troubleshooting {#check-the-status-of-backups} The backup command returns an id and status , and that id can be used to get the status of the backup. This is very useful to check the...
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e63277f8-eea9-479f-89d5-db01876eae55
description: 'Composable protocols allows more flexible configuration of TCP access to the ClickHouse server.' sidebar_label: 'Composable protocols' sidebar_position: 64 slug: /operations/settings/composable-protocols title: 'Composable protocols' doc_type: 'reference' Composable protocols Overview {#overview} ...
{"source_file": "composable-protocols.md"}
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67895b9e-8db7-40a0-b10d-31c7a1c3c296
http 127.0.0.1 8123 tls plain_http 127.0.0.1 8443 ``` Defining additional endpoints {#additional-endpoints-can-be-defined-by-referencing-any-module-and-omitting-type-tag} Additional endpoints can be defined by referencing any module and omitting the <type> tag. For example, we can define an...
{"source_file": "composable-protocols.md"}
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59e501cb-9ae0-46d5-bbf1-e153dc147cf1
description: 'A collection of settings grouped under the same name.' sidebar_label: 'Settings profiles' sidebar_position: 61 slug: /operations/settings/settings-profiles title: 'Settings profiles' doc_type: 'reference' Settings profiles A settings profile is a collection of settings grouped under the same name. ...
{"source_file": "settings-profiles.md"}
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0471f269-f327-459a-b1c1-8d9bf62ac4fd
title: 'Session Settings' sidebar_label: 'Session Settings' slug: /operations/settings/settings toc_max_heading_level: 2 description: 'Settings which are found in the system.settings table.' doc_type: 'reference' import ExperimentalBadge from '@theme/badges/ExperimentalBadge'; import BetaBadge from '@theme/badges...
{"source_file": "settings.md"}
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f1af0cd8-9d11-4424-a055-e1a1c4893c3e
aggregation_memory_efficient_merge_threads {#aggregation_memory_efficient_merge_threads} Number of threads to use for merge intermediate aggregation results in memory efficient mode. When bigger, then more memory is consumed. 0 means - same as 'max_threads'. allow_aggregate_partitions_independently {#allow_aggreg...
{"source_file": "settings.md"}
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5b05b194-b2b0-4443-8343-b67f9a17d44a
Allow to create *MergeTree tables with deprecated engine definition syntax allow_distributed_ddl {#allow_distributed_ddl} If it is set to true, then a user is allowed to executed distributed DDL queries. allow_drop_detached {#allow_drop_detached} Allow ALTER TABLE ... DROP DETACHED PART[ITION] ... queries ...
{"source_file": "settings.md"}
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b7f2635f-0252-42ca-a8a6-1dd5ccc21279
Allow to explicitly use 'OPTIMIZE' for iceberg tables. allow_experimental_insert_into_iceberg {#allow_experimental_insert_into_iceberg} Allow to execute insert queries into iceberg. allow_experimental_join_right_table_sorting {#allow_experimental_join_right_table_sorting} join_to_sort_minimum_perkey...
{"source_file": "settings.md"}
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72496eac-d662-4d13-a2d4-d140ddce9713
Experimental timeSeries* aggregate functions for Prometheus-like timeseries resampling, rate, delta calculation. allow_experimental_time_series_table {#allow_experimental_time_series_table} Allows creation of tables with the TimeSeries table engine. Possible values: - 0 — the TimeSeries table engine is di...
{"source_file": "settings.md"}
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f4b50e77-8d04-498b-8931-01a4c868b52e
Allow named collections' fields override by default. allow_non_metadata_alters {#allow_non_metadata_alters} Allow to execute alters which affects not only tables metadata, but also data on disk allow_nonconst_timezone_arguments {#allow_nonconst_timezone_arguments} Allow non-const timezone arguments in cer...
{"source_file": "settings.md"}
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4ea659c7-de39-45b5-9070-14a9feb6fcad
When moving conditions from WHERE to PREWHERE, allow reordering them to optimize filtering allow_settings_after_format_in_insert {#allow_settings_after_format_in_insert} Control whether SETTINGS after FORMAT in INSERT queries is allowed or not. It is not recommended to use this, since this may interpret p...
{"source_file": "settings.md"}
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1217f26b-115f-499f-9085-a322eec139df
Allow suspicious PRIMARY KEY / ORDER BY for MergeTree (i.e. SimpleAggregateFunction). allow_suspicious_ttl_expressions {#allow_suspicious_ttl_expressions} Reject TTL expressions that don't depend on any of table's columns. It indicates a user error most of the time. allow_suspicious_types_in_group_by {#allo...
{"source_file": "settings.md"}
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57c6fbfe-b991-4bdf-b1ab-5b1210dbc6bc
alter_sync {#alter_sync} Allows to set up waiting for actions to be executed on replicas by ALTER , OPTIMIZE or TRUNCATE queries. Possible values: 0 — Do not wait. 1 — Wait for own execution. 2 — Wait for everyone. Cloud default value: 1 . :::note alter_sync is applicable to Replicated ...
{"source_file": "settings.md"}
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ca9ee462-7c0b-4113-a522-2c6ca5be1a36
Possible values: 0 — Legacy behaviour is disabled. 1 — Legacy behaviour is enabled. See also: JOIN strictness apply_deleted_mask {#apply_deleted_mask} Enables filtering out rows deleted with lightweight DELETE. If disabled, a query will be able to read those rows. This is useful for debugging and ...
{"source_file": "settings.md"}
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899af885-f60b-42e9-928b-a15aaf4a8c56
Maximum time to wait before dumping collected data per query since the first data appeared. async_insert_busy_timeout_min_ms {#async_insert_busy_timeout_min_ms} If auto-adjusting is enabled through async_insert_use_adaptive_busy_timeout, minimum time to wait before dumping collected data per query since the fir...
{"source_file": "settings.md"}
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f308ef81-b620-4a50-afa1-7ac8d0d43777
azure_max_get_rps {#azure_max_get_rps} Limit on Azure GET request per second rate before throttling. Zero means unlimited. azure_max_inflight_parts_for_one_file {#azure_max_inflight_parts_for_one_file} The maximum number of a concurrent loaded parts in multipart upload request. 0 means unlimited. azure_...
{"source_file": "settings.md"}
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68c51439-0041-4622-9380-95c476d2d54b
azure_truncate_on_insert {#azure_truncate_on_insert} Enables or disables truncate before insert in azure engine tables. azure_upload_part_size_multiply_factor {#azure_upload_part_size_multiply_factor} Multiply azure_min_upload_part_size by this factor each time azure_multiply_parts_count_threshold parts wer...
{"source_file": "settings.md"}
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a84af51e-45f5-4650-96a9-0372755274dd
backup_restore_keeper_max_retries_while_initializing {#backup_restore_keeper_max_retries_while_initializing} Max retries for [Zoo]Keeper operations during the initialization of a BACKUP ON CLUSTER or RESTORE ON CLUSTER operation. backup_restore_keeper_retry_initial_backoff_ms {#backup_restore_keeper_retry_initi...
{"source_file": "settings.md"}
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fa819053-9267-41b7-9a4e-548b2ad0302a
Cancels HTTP read-only queries (e.g. SELECT) when a client closes the connection without waiting for the response. Cloud default value: 0 . cast_ipv4_ipv6_default_on_conversion_error {#cast_ipv4_ipv6_default_on_conversion_error} CAST operator into IPv4, CAST operator into IPV6 type, toIPv4, toIPv6 functions ...
{"source_file": "settings.md"}
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eceff405-8dba-415e-803d-41119f5d31db
check_query_single_value_result {#check_query_single_value_result} Defines the level of detail for the CHECK TABLE query result for MergeTree family engines . Possible values: 0 — the query shows a check status for every individual data part of a table. 1 — the query shows the general table check status...
{"source_file": "settings.md"}
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c41104d1-da4c-4e63-8bd4-02af73577273
This setting takes a ClickHouse version number as a string, like 22.3 , 22.8 . An empty value means that this setting is disabled. Disabled by default. :::note In ClickHouse Cloud, the service-level default compatibility setting must be set by ClickHouse Cloud support. Please open a case to have it set. However...
{"source_file": "settings.md"}
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1e137f5a-e55c-4ab7-8ea0-c23db16ec081
For example, notice how the following SELECT query is not modified (the default behavior): sql EXPLAIN SYNTAX SELECT * FROM ( SELECT number AS x FROM numbers(20) ) AS a WHERE ((x >= 1) AND (x <= 5)) OR ((x >= 10) AND (x <= 15)) SETTINGS convert_query_to_cnf = false; The result is: response ┌─explain────...
{"source_file": "settings.md"}
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53df74b4-eb35-4689-bafc-ffd5b551a38b
Possible values: true, false correlated_subqueries_default_join_kind {#correlated_subqueries_default_join_kind} Controls the kind of joins in the decorrelated query plan. The default value is right , which means that decorrelated plan will contain RIGHT JOINs with subquery input on the right side. Possible v...
{"source_file": "settings.md"}
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bef372ff-09f6-4b90-90d4-7d8fc114e159
Possible values: 1 — The data types in column definitions are set to Nullable by default. 0 — The data types in column definitions are set to not Nullable by default. database_atomic_wait_for_drop_and_detach_synchronously {#database_atomic_wait_for_drop_and_detach_synchronously} Adds a modifier SYNC ...
{"source_file": "settings.md"}
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23133f12-928b-4d9d-bad1-2ae371579847
Enables or disables the deduplication check for materialized views that receive data from Replicated* tables. Possible values: 0 — Disabled. 1 — Enabled. When enabled, ClickHouse performs deduplication of blocks in materialized views that depend on Replicated* tables. This setting is useful for ensuring that...
{"source_file": "settings.md"}
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80c74610-d324-4e53-93cf-ea84a257f386
default_view_definer {#default_view_definer} DEFINER option while creating a view"}]}]}/> Allows to set default DEFINER option while creating a view. More about SQL security . The default value is CURRENT_USER . delta_lake_enable_engine_predicate {#delta_lake_enable_engine_predicate} Enables delta-...
{"source_file": "settings.md"}
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babf62a2-27d1-4e13-879a-159e8775df7d
Is the memory-saving mode of distributed aggregation enabled. distributed_background_insert_batch {#distributed_background_insert_batch} Enables/disables inserted data sending in batches. When batch sending is enabled, the Distributed table engine tries to send multiple files of inserted data in one operation...
{"source_file": "settings.md"}
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e75dd98e-7c2d-4555-a9cb-6cbf7b86e732
Only has an effect in ClickHouse Cloud. Maximum backoff milliseconds for distributed cache connection creation. distributed_cache_connect_backoff_min_ms {#distributed_cache_connect_backoff_min_ms} Only has an effect in ClickHouse Cloud. Minimum backoff milliseconds for distributed cache connection creation. ...
{"source_file": "settings.md"}
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6db2c1e8-8703-4ef3-904f-d6c9f39591a2
distributed_cache_read_request_max_tries {#distributed_cache_read_request_max_tries} Only has an effect in ClickHouse Cloud. Number of tries to do distributed cache request if unsuccessful distributed_cache_receive_response_wait_milliseconds {#distributed_cache_receive_response_wait_milliseconds} Only...
{"source_file": "settings.md"}
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8dc7e19d-8667-401c-9dd4-11279aea4879
none — Is similar to throw, but distributed DDL query returns no result set. null_status_on_timeout — Returns NULL as execution status in some rows of result set instead of throwing TIMEOUT_EXCEEDED if query is not finished on the corresponding hosts. never_throw — Do not throw TIMEOUT_EXCEEDED and do not ...
{"source_file": "settings.md"}
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38b0165c-e078-4947-afe5-cb4edf94ca62
Example ```sql SELECT * FROM remote('127.0.0.{2,3}', system.one) GROUP BY dummy LIMIT 1 SETTINGS distributed_group_by_no_merge = 1 FORMAT PrettyCompactMonoBlock ┌─dummy─┐ │ 0 │ │ 0 │ └───────┘ ``` ```sql SELECT * FROM remote('127.0.0.{2,3}', system.one) GROUP BY dummy LIMIT 1 SETTINGS distributed_group_by...
{"source_file": "settings.md"}
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7297e17c-a9fb-4c40-a1b6-7ec68dfb2dd0
Possible values: deny — Default value. Prohibits using these types of subqueries (returns the "Double-distributed in/JOIN subqueries is denied" exception). local — Replaces the database and table in the subquery with local ones for the destination server (shard), leaving the normal IN / JOIN. global — Repla...
{"source_file": "settings.md"}
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f586a845-9972-49d2-ae3b-de8b7ea99f03
empty_result_for_aggregation_by_constant_keys_on_empty_set {#empty_result_for_aggregation_by_constant_keys_on_empty_set} Return empty result when aggregating by constant keys on empty set. empty_result_for_aggregation_by_empty_set {#empty_result_for_aggregation_by_empty_set} Return empty result when aggregati...
{"source_file": "settings.md"}
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27baa71e-dda0-4b95-aa8c-2b03b9fd45f1
| Function | enable_extended_results_for_datetime_functions = 0 | enable_extended_results_for_datetime_functions = 1 | |----------|---------------------------------------------------|---------------------------------------------------| | toStartOfYear | Returns Date or DateTime | Returns Date / DateTime for...
{"source_file": "settings.md"}
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8add1081-65e8-4b2d-844f-436a9162148a
input | | timeSlot | Returns DateTime Note: Wrong results for values outside 1970-2149 range | Returns DateTime for Date / DateTime input Returns DateTime64 for Date32 / DateTime64 input |
{"source_file": "settings.md"}
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aaf98bd1-60ef-4c69-b7f2-92ce356c3f36
enable_filesystem_cache {#enable_filesystem_cache} Use cache for remote filesystem. This setting does not turn on/off cache for disks (must be done via disk config), but allows to bypass cache for some queries if intended enable_filesystem_cache_log {#enable_filesystem_cache_log} Allows to record the filesyst...
{"source_file": "settings.md"}
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d8328c93-f9eb-47ee-98cc-5b349ad2761f
Generate named tuples in function tuple() when all names are unique and can be treated as unquoted identifiers. enable_optimize_predicate_expression {#enable_optimize_predicate_expression} Turns on predicate pushdown in SELECT queries. Predicate pushdown may significantly reduce network traffic for distribu...
{"source_file": "settings.md"}
[ 0.024564672261476517, -0.016006914898753166, 0.011403035372495651, 0.08648306876420975, -0.026891257613897324, -0.04699135944247246, -0.006201330106705427, -0.01005728729069233, -0.03494687005877495, -0.004692349582910538, 0.015367401763796806, -0.04261185973882675, 0.0434555783867836, -0....
e00aff16-862e-476a-8af2-dd4d388f1c33
SELECT * FROM positional_arguments ORDER BY 2,3; ``` Result: text ┌─one─┬─two─┬─three─┐ │ 30 │ 10 │ 20 │ │ 20 │ 20 │ 10 │ │ 10 │ 20 │ 30 │ └─────┴─────┴───────┘ enable_producing_buckets_out_of_order_in_aggregation {#enable_producing_buckets_out_of_order_in_aggregation} Allow memory-efficient ...
{"source_file": "settings.md"}
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enable_software_prefetch_in_aggregation {#enable_software_prefetch_in_aggregation} Enable use of software prefetch in aggregatio enable_unaligned_array_join {#enable_unaligned_array_join} Allow ARRAY JOIN with multiple arrays that have different sizes. When this settings is enabled, arrays will be resized to ...
{"source_file": "settings.md"}
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except_default_mode {#except_default_mode} Set default mode in EXCEPT query. Possible values: empty string, 'ALL', 'DISTINCT'. If empty, query without mode will throw exception. exclude_materialize_skip_indexes_on_insert {#exclude_materialize_skip_indexes_on_insert} Excludes specified skip indexes from being ...
{"source_file": "settings.md"}
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Usage If the setting is set to 0 , the table function does not make Nullable columns and inserts default values instead of NULL. This is also applicable for NULL values inside arrays. external_table_strict_query {#external_table_strict_query} If it is set to true, transforming expression to local filter is for...
{"source_file": "settings.md"}
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59c7ae0b-5f31-4278-8903-d968d798c3bb
Wait time to lock cache for space reservation in filesystem cache filesystem_cache_segments_batch_size {#filesystem_cache_segments_batch_size} Limit on size of a single batch of file segments that a read buffer can request from cache. Too low value will lead to excessive requests to cache, too large may slow down...
{"source_file": "settings.md"}
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6cfde90a-d008-461e-b0ce-a592343d3386
Examples Query: ``sql SET flatten_nested = 1; CREATE TABLE t_nest ( n` Nested(a UInt32, b UInt32)) ENGINE = MergeTree ORDER BY tuple(); SHOW CREATE TABLE t_nest; ``` Result: text ┌─statement────────────────────────────────────────────────────────────────────────────────────────────────────────────────────────...
{"source_file": "settings.md"}
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force_grouping_standard_compatibility {#force_grouping_standard_compatibility} Make GROUPING function to return 1 when argument is not used as an aggregation key force_index_by_date {#force_index_by_date} Disables query execution if the index can't be used by date. Works with tables in the MergeTree famil...
{"source_file": "settings.md"}
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force_primary_key {#force_primary_key} Disables query execution if indexing by the primary key is not possible. Works with tables in the MergeTree family. If force_primary_key=1 , ClickHouse checks to see if the query has a primary key condition that can be used for restricting data ranges. If there is no suit...
{"source_file": "settings.md"}
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```sql SELECT JSON_VALUE('{"hello":{"world":"!"}}', '$.hello') settings function_json_value_return_type_allow_complex=true ┌─JSON_VALUE('{"hello":{"world":"!"}}', '$.hello')─┐ │ {"world":"!"} │ └──────────────────────────────────────────────────┘ 1 row in set. Elapsed: 0.001 sec. ...
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geotoh3_argument_order {#geotoh3_argument_order} Function 'geoToH3' accepts (lon, lat) if set to 'lon_lat' and (lat, lon) if set to 'lat_lon'. glob_expansion_max_elements {#glob_expansion_max_elements} Maximum number of allowed addresses (For external storages, table functions, etc). grace_hash_join_ini...
{"source_file": "settings.md"}
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Possible values: - 0 — INSERT query appends new data to the end of the file. - 1 — INSERT query creates a new file. hdfs_ignore_file_doesnt_exist {#hdfs_ignore_file_doesnt_exist} Ignore absence of file if it does not exist when reading certain keys. Possible values: - 1 — SELECT returns empty result. - ...
{"source_file": "settings.md"}
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http_max_fields {#http_max_fields} Maximum number of fields in HTTP header http_max_multipart_form_data_size {#http_max_multipart_form_data_size} Limit on size of multipart/form-data content. This setting cannot be parsed from URL parameters and should be set in a user profile. Note that content is parsed and...
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http_retry_max_backoff_ms {#http_retry_max_backoff_ms} Max milliseconds for backoff, when retrying read via http http_send_timeout {#http_send_timeout} HTTP send timeout (in seconds). Possible values: Any positive integer. 0 - Disabled (infinite timeout). :::note It's applicable only to the defa...
{"source_file": "settings.md"}
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ignore_data_skipping_indices {#ignore_data_skipping_indices} Ignores the skipping indexes specified if used by the query. Consider the following example: ```sql CREATE TABLE data ( key Int, x Int, y Int, INDEX x_idx x TYPE minmax GRANULARITY 1, INDEX y_idx y TYPE minmax GRANULARITY 1, INDE...
{"source_file": "settings.md"}
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ignore_on_cluster_for_replicated_access_entities_queries {#ignore_on_cluster_for_replicated_access_entities_queries} Ignore ON CLUSTER clause for replicated access entities management queries. ignore_on_cluster_for_replicated_named_collections_queries {#ignore_on_cluster_for_replicated_named_collections_queries} ...
{"source_file": "settings.md"}
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insert_deduplicate {#insert_deduplicate} Enables or disables block deduplication of INSERT (for Replicated* tables). Possible values: 0 — Disabled. 1 — Enabled. By default, blocks inserted into replicated tables by the INSERT statement are deduplicated (see Data Replication ). For the replicated ta...
{"source_file": "settings.md"}
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Possible values: Positive integer. 0 — Retries are disabled Cloud default value: 20 . Keeper request retries are done after some timeout. The timeout is controlled by the following settings: insert_keeper_retry_initial_backoff_ms , insert_keeper_retry_max_backoff_ms . The first retry is done after inser...
{"source_file": "settings.md"}
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When insert_quorum_parallel is disabled, all replicas in the quorum are consistent, i.e. they contain data from all previous INSERT queries (the INSERT sequence is linearized). When reading data written using insert_quorum and insert_quorum_parallel is disabled, you can turn on sequential consistency for SEL...
{"source_file": "settings.md"}
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Result: text ┌─number─┐ │ 0 │ │ 0 │ │ 1 │ │ 1 │ │ 2 │ │ 2 │ │ 3 │ │ 3 │ │ 4 │ │ 4 │ └────────┘ interactive_delay {#interactive_delay} The interval in microseconds for checking whether request execution has been canceled and sending the progress. intersect_defa...
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The RIGHT JOIN and FULL JOIN are supported only with ALL strictness ( SEMI , ANTI , ANY , and ASOF are not supported). When using the partial_merge algorithm, ClickHouse sorts the data and dumps it to the disk. The partial_merge algorithm in ClickHouse differs slightly from the classic realization. Firs...
{"source_file": "settings.md"}
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5dab9e6b-379e-4061-acb7-8923d442ba3c
The bigger the value of the setting, the more RAM is used and the less disk I/O is needed. Possible values: Any positive integer, starting from 2. join_output_by_rowlist_perkey_rows_threshold {#join_output_by_rowlist_perkey_rows_threshold} The lower limit of per-key average rows in the right table to de...
{"source_file": "settings.md"}
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joined_subquery_requires_alias {#joined_subquery_requires_alias} Force joined subqueries and table functions to have aliases for correct name qualification. kafka_disable_num_consumers_limit {#kafka_disable_num_consumers_limit} Disable limit on kafka_num_consumers that depends on the number of available CPU c...
{"source_file": "settings.md"}
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lightweight_deletes_sync {#lightweight_deletes_sync} The same as mutations_sync , but controls only execution of lightweight deletes. Possible values: | Value | Description ...
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For instance, example01-01-1 and example01-01-2 are different in one position, while example01-01-1 and example01-02-2 differ in two places. This method might seem primitive, but it does not require external data about network topology, and it does not compare IP addresses, which would be complicated for our IPv6 addre...
{"source_file": "settings.md"}
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9bf1d0ad-0025-43e3-8cbc-71b992f88903
local_filesystem_read_method {#local_filesystem_read_method} Method of reading data from local filesystem, one of: read, pread, mmap, io_uring, pread_threadpool. The 'io_uring' method is experimental and does not work for Log, TinyLog, StripeLog, File, Set and Join, and other tables with append-able files in pres...
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d39c207c-1f4c-4372-be58-940f723c246c
log_profile_events {#log_profile_events} Log query performance statistics into the query_log, query_thread_log and query_views_log. log_queries {#log_queries} Setting up query logging. Queries sent to ClickHouse with this setup are logged according to the rules in the query_log server configuration parame...
{"source_file": "settings.md"}
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a2d68829-c34a-442a-9ffc-b3f02da7d6aa
Example: text log_query_views=1 low_cardinality_allow_in_native_format {#low_cardinality_allow_in_native_format} Allows or restricts using the LowCardinality data type with the Native format. If usage of LowCardinality is restricted, ClickHouse server converts LowCardinality -columns to ordinary ones f...
{"source_file": "settings.md"}
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e50c1beb-c7e5-48b3-b726-18b005723d73
materialized_views_squash_parallel_inserts {#materialized_views_squash_parallel_inserts} Squash inserts to materialized views destination table of a single INSERT query from parallel inserts to reduce amount of generated parts. If set to false and parallel_view_processing is enabled, INSERT query will generate ...
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eb829496-1ac3-4cd3-bc17-f03eb348d2b2
Possible values: Maximum volume of RAM (in bytes) that can be used by the single GROUP BY operation. 0 — GROUP BY in external memory disabled. :::note If memory usage during GROUP BY operations is exceeding this threshold in bytes, activate the 'external aggregation' mode (spill data to disk). The reco...
{"source_file": "settings.md"}
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d62e068d-dec0-4374-82e3-ef2853d52157
For example, if set to 0.6 , ORDER BY will allow using 60% of available memory (to server/user/merges) at the beginning of the execution, after that, it will start using external sort. Note, that max_bytes_before_external_sort is still respected, spilling to disk will be done only if the sorting block is bigge...
{"source_file": "settings.md"}
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a96a7df6-44d3-4514-8614-f86dbb98d662
:::note This is an expert-level setting, and you shouldn't change it if you're just getting started with ClickHouse. ::: Don't confuse blocks for compression (a chunk of memory consisting of bytes) with blocks for query processing (a set of rows from a table). max_concurrent_queries_for_all_users {#max_concurrent_q...
{"source_file": "settings.md"}
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c7ef92d2-235e-4aa9-bd61-dd389e477d45
timeout_before_checking_execution_speed expires. If the execution speed is high, the execution speed will be reduced. max_execution_time {#max_execution_time} The maximum query execution time in seconds. The max_execution_time parameter can be a bit tricky to understand. It operates based on interpolation re...
{"source_file": "settings.md"}
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fa78f962-df99-4d0a-b2c9-babb25664013
Possible values: Positive integer. 0 or 1 — Disabled. SELECT queries are executed in a single thread. max_http_get_redirects {#max_http_get_redirects} Max number of HTTP GET redirects hops allowed. Ensures additional security measures are in place to prevent a malicious server from redirecting your requ...
{"source_file": "settings.md"}
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da5bbd1a-915d-42ea-bdbc-76765683ee12
Result: text Exception: Total regexp lengths too large. See Also max_hyperscan_regexp_length max_insert_block_size {#max_insert_block_size} The size of blocks (in a count of rows) to form for insertion into a table. This setting only applies in cases when the server forms the blocks. For example, for an...
{"source_file": "settings.md"}
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b061536e-d4f1-483c-96c7-21351956f10e
Cloud default value: depends on the amount of RAM on the replica. The maximum amount of RAM to use for running a query on a single server. A value of 0 means unlimited. This setting does not consider the volume of available memory or the total volume of memory on the machine. The restriction applies to a single q...
{"source_file": "settings.md"}
[ 0.058513619005680084, -0.019166525453329086, -0.09626295417547226, 0.04705922305583954, -0.06157240271568298, -0.005232424940913916, 0.025746844708919525, 0.05970621854066849, 0.0032360234763473272, 0.049540918320417404, -0.042094677686691284, 0.03261769190430641, 0.03146950155496597, -0.0...
0d3cae6d-7dca-4a34-a8e3-e5654b779dee
Maximal number of partitions in table to apply optimizatio max_os_cpu_wait_time_ratio_to_throw {#max_os_cpu_wait_time_ratio_to_throw} Max ratio between OS CPU wait (OSCPUWaitMicroseconds metric) and busy (OSCPUVirtualTimeMicroseconds metric) times to consider rejecting queries. Linear interpolation between min ...
{"source_file": "settings.md"}
[ -0.019228143617510796, -0.04961317405104637, -0.017598921433091164, 0.0037342270370572805, -0.007046154234558344, -0.09938342124223709, -0.0672692134976387, 0.031723055988550186, 0.0367400124669075, -0.029997823759913445, -0.03960021212697029, -0.02309231273829937, 0.050637707114219666, -0...
d59f7478-1b81-49e9-9491-363bf80574a9
0 — Unlimited number of partitions. Details When inserting data, ClickHouse calculates the number of partitions in the inserted block. If the number of partitions is more than max_partitions_per_insert_block , ClickHouse either logs a warning or throws an exception based on throw_on_max_partitions_per_insert_b...
{"source_file": "settings.md"}
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2effbe6e-2d72-424b-a96a-f1cb233b10db
The maximum size of the buffer to read from local filesystem. If set to 0 then max_read_buffer_size will be used. max_read_buffer_size_remote_fs {#max_read_buffer_size_remote_fs} The maximum size of the buffer to read from remote filesystem. If set to 0 then max_read_buffer_size will be used. max_recursive_cte_...
{"source_file": "settings.md"}
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a4684c07-039c-458e-82ad-e65bdd4522d2
ClickHouse can proceed with different actions when the limit is reached. Use the join_overflow_mode setting to choose the action. Possible values: Positive integer. 0 — Unlimited number of rows. max_rows_in_set {#max_rows_in_set} The maximum number of rows for a data set in the IN clause created from...
{"source_file": "settings.md"}
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f2585b3b-5a93-45e5-b2d9-3f47cfdc4013
max_sessions_for_user {#max_sessions_for_user} Maximum number of simultaneous sessions per authenticated user to the ClickHouse server. Example: xml <profiles> <single_session_profile> <max_sessions_for_user>1</max_sessions_for_user> </single_session_profile> <two_sessions_profile> <...
{"source_file": "settings.md"}
[ 0.037978991866111755, -0.006386587396264076, -0.099732406437397, -0.048401474952697754, -0.12682859599590302, -0.03380252793431282, 0.07815849035978317, 0.004095249343663454, -0.039888184517621994, -0.014511344023048878, 0.01176841277629137, -0.005349732469767332, 0.0961945503950119, -0.01...