id stringlengths 36 36 | document stringlengths 3 3k | metadata stringlengths 23 69 | embeddings listlengths 384 384 |
|---|---|---|---|
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']
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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... | {"source_file": "01_local_disk.md"} | [
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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... | {"source_file": "01_local_disk.md"} | [
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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... | {"source_file": "01_local_disk.md"} | [
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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 | {"source_file": "01_local_disk.md"} | [
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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... | {"source_file": "00_overview.md"} | [
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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... | {"source_file": "00_overview.md"} | [
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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
|
|------------------------------------------------------------------------|------------------------... | {"source_file": "00_overview.md"} | [
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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... | {"source_file": "00_overview.md"} | [
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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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-0.020772431045770645,
0.10404323041439056,
-0.06... |
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"} | [
-0.05101504921913147,
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0.028190718963742256,
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0.06543586403131485,
-0.085599... |
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"} | [
-0.026084771379828453,
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0.05630797520279884,
-0.0002802993403747678,
-0.063... |
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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0.024762792512774467,
-0.03... |
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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0.041429661214351654,
0.08890920877456665,
-0.069549... |
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"} | [
-0.016238141804933548,
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0.022969555109739304,
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-0.07718425244092941,
-0.03582056611776352,
0.0... |
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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0.028973136097192764,
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-0.02998509258031845,
... |
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"} | [
-0.011206061579287052,
0.00047206130693666637,
-0.0435987189412117,
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0.07311457395553589,
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0.06306961923837662,
0.007897543720901012,
0.03637146204710007,
-0... |
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"} | [
0.033052414655685425,
0.021521706134080887,
-0.013077848590910435,
0.008031669072806835,
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0.03354140743613243,
0.04059012606739998,
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0.03246339038014412,
0.03781738504767418,
0.007493365090340376,
0.04875722900032997,
0.02574... |
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"} | [
-0.06290240585803986,
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0.08340244740247726,
0.03777909278869629,
0.0005257497541606426,
0.05150342732667923,
-0.... |
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"} | [
-0.06334996968507767,
0.036448393017053604,
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0.03443923220038414,
0.07316525280475616,
-0.130052... |
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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0.012233546935021877,
0.05212551727890968,
0.010766023769974709,
0.061952732503414154,
-0... |
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"} | [
0.014182738959789276,
-0.009703579358756542,
-0.011947656981647015,
-0.007231163326650858,
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0.03439301997423172,
0.08570190519094467,
-0.0010164289269596338,
0.02656397968530655,
0.03590156510472298,
-... |
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"} | [
0.027209123596549034,
0.006411771755665541,
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0.06234541907906532,
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0.013181783258914948,
0.06507613509893417,
0.04317497834563255,
0.013637622818350792,
0.110102079808712,
-0.0409... |
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"} | [
0.0032747145742177963,
0.02632795087993145,
-0.01426155585795641,
0.05389823392033577,
-0.02291659452021122,
-0.02933404967188835,
-0.024482587352395058,
-0.0355345644056797,
-0.009210622869431973,
0.04436187818646431,
0.0071116117760539055,
0.036279622465372086,
0.04875053092837334,
-0.05... |
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"} | [
0.01290914136916399,
0.009712659753859043,
-0.02065064013004303,
0.03753944858908653,
-0.06560289859771729,
0.05464089661836624,
0.03436491638422012,
-0.05458386242389679,
0.009806349873542786,
0.04766811057925224,
-0.021903472021222115,
0.014542324468493462,
-0.039138950407505035,
-0.0574... |
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"} | [
-0.0125394556671381,
-0.04636191576719284,
0.00028130924329161644,
-0.04916555806994438,
0.030064772814512253,
-0.07052332162857056,
0.05293865501880646,
0.00634782575070858,
-0.020502733066678047,
0.0053842091001570225,
0.06599394977092743,
-0.010391312651336193,
-0.0029709276277571917,
-... |
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"} | [
0.023420685902237892,
-0.061423320323228836,
-0.02216489613056183,
-0.012700176797807217,
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0.0012360315304249525,
0.017663752660155296,
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0.010160654783248901,
0.08352497965097427,
-0.05872844159603119,
0.08497558534145355,
-... |
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"} | [
0.0036241882480680943,
0.00026863408857025206,
0.029845885932445526,
-0.020008176565170288,
-0.011573048308491707,
-0.01605124957859516,
-0.0022930267732590437,
-0.024425670504570007,
-0.047043152153491974,
0.020713023841381073,
-0.000840836379211396,
-0.007176160346716642,
0.022410754114389... |
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"} | [
-0.008144836872816086,
0.007436370477080345,
0.022024529054760933,
0.09186971932649612,
-0.08161979913711548,
0.018943114206194878,
-0.019154539331793785,
-0.0737958773970604,
-0.04888084530830383,
-0.04818631336092949,
-0.06690504401922226,
-0.0006908094510436058,
0.06961692124605179,
0.0... |
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"} | [
-0.06673890352249146,
-0.06314970552921295,
-0.06851611286401749,
0.025571616366505623,
-0.024292349815368652,
-0.10951390862464905,
-0.015146151185035706,
-0.07713685929775238,
-0.06742298603057861,
-0.019016195088624954,
0.08986225724220276,
-0.009618098847568035,
0.08788558840751648,
-0... |
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"} | [
-0.07709011435508728,
-0.06426064670085907,
-0.12152443081140518,
0.038049861788749695,
-0.0794769898056984,
-0.03816003352403641,
-0.0069106025621294975,
-0.03148996829986572,
-0.04160391166806221,
0.025968704372644424,
0.059919267892837524,
0.00666282931342721,
0.07404016703367233,
-0.03... |
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"} | [
0.007171486038714647,
-0.029504524543881416,
-0.06637789309024811,
-0.022736329585313797,
-0.04533366486430168,
-0.04330827668309212,
0.054385747760534286,
0.040028396993875504,
-0.06672187894582748,
0.032246850430965424,
0.04237570986151695,
-0.06724683940410614,
0.02588840387761593,
0.00... |
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"} | [
-0.0019772422965615988,
-0.040044452995061874,
-0.06000164523720741,
0.09250322729349136,
-0.00845403503626585,
-0.029401790350675583,
-0.04992017522454262,
0.04399440810084343,
-0.022020291537046432,
0.029272910207509995,
0.01840023696422577,
0.016669176518917084,
0.07667895406484604,
-0.... |
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"} | [
-0.006011746358126402,
-0.01862143911421299,
-0.028516637161374092,
0.013518600724637508,
-0.06429656594991684,
-0.06596952676773071,
-0.008481120690703392,
-0.05771220847964287,
0.047142527997493744,
0.06431987136602402,
0.003085814882069826,
0.0723213478922844,
0.025651175528764725,
-0.0... |
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"} | [
0.021807605400681496,
0.0002265919465571642,
0.003644403303042054,
0.0051569207571446896,
-0.023105503991246223,
-0.09395977109670639,
-0.007588756736367941,
-0.05301140248775482,
0.04377162083983421,
0.07983392477035522,
0.01085179764777422,
0.02748461626470089,
0.004731134977191687,
-0.0... |
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"} | [
0.025074012577533722,
-0.02107952907681465,
-0.016184067353606224,
0.034030355513095856,
0.056389834731817245,
-0.07429706305265427,
-0.017773400992155075,
-0.0715828686952591,
0.03576856851577759,
-0.0042703780345618725,
0.05037833750247955,
0.014741526916623116,
0.06564725935459137,
-0.0... |
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"} | [
0.025543391704559326,
-0.08577277511358261,
-0.002523588016629219,
0.07733480632305145,
-0.003402820322662592,
-0.0933847576379776,
-0.07941193878650665,
-0.03585537523031235,
0.027829458937048912,
0.06958238035440445,
0.048380907624959946,
0.02779974602162838,
0.09135372191667557,
-0.0686... |
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"} | [
0.00639613950625062,
-0.021923676133155823,
0.019199874252080917,
0.012520956806838512,
-0.022544706240296364,
-0.08145397156476974,
-0.04225531592965126,
-0.0038720364682376385,
0.0047324360348284245,
-0.03483440726995468,
0.0645584911108017,
0.008850294165313244,
0.12576328217983246,
-0.... |
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"} | [
-0.03097148798406124,
0.02333858795464039,
0.02787068672478199,
0.07692645490169525,
-0.032372985035181046,
-0.029917748644948006,
-0.008847766555845737,
0.04479305073618889,
0.060434721410274506,
-0.020571269094944,
0.03320690989494324,
-0.020850704982876778,
0.12950831651687622,
-0.10144... |
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"} | [
-0.019598452374339104,
-0.037126436829566956,
-0.08612291514873505,
0.06980659067630768,
0.006801149807870388,
0.030506929382681847,
-0.08233440667390823,
0.04646476358175278,
-0.05250754952430725,
-0.023670971393585205,
0.02231452241539955,
-0.04297748953104019,
-0.03124350495636463,
-0.0... |
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"} | [
0.04597139358520508,
0.025093471631407738,
0.003401530906558037,
-0.024429596960544586,
0.04238351061940193,
0.056388817727565765,
-0.10377383232116699,
0.08178780972957611,
-0.009101645089685917,
0.011051760986447334,
0.030910110101103783,
-0.09302392601966858,
-0.006781836971640587,
0.03... |
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"} | [
0.037795066833496094,
0.01327503751963377,
-0.03187978267669678,
0.062238212674856186,
-0.00044201500713825226,
-0.04668835178017616,
0.016055503860116005,
0.033886849880218506,
0.02960728108882904,
0.08797702193260193,
0.011531071737408638,
0.14967168867588043,
-0.04684809222817421,
-0.04... |
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"} | [
-0.06100214645266533,
0.006734733935445547,
-0.011711443774402142,
0.04410944879055023,
-0.02319379709661007,
-0.06907986849546432,
-0.036675550043582916,
-0.005759399849921465,
0.0381966196000576,
0.030899276956915855,
-0.02958744205534458,
0.07822725921869278,
0.04980852082371712,
-0.078... |
36ec6789-bbaa-404b-bb53-9160fa302900 | 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"} | [
-0.06197699159383774,
-0.0074104624800384045,
-0.09501239657402039,
0.06212810426950455,
-0.1288023591041565,
-0.02086487226188183,
-0.05838640034198761,
0.012387020513415337,
-0.02548227831721306,
0.01866714283823967,
-0.03681173548102379,
0.09264438599348068,
0.02022695355117321,
-0.0610... |
f7da733a-9d65-4c50-b91f-f74995768dab | 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"} | [
0.034545768052339554,
0.038448017090559006,
0.04112201929092407,
0.06289051473140717,
0.003551909700036049,
-0.004448652267456055,
0.041319988667964935,
-0.034087203443050385,
-0.06451132148504257,
-0.003657609922811389,
0.06418073177337646,
0.03114217333495617,
0.05533859506249428,
-0.098... |
4caf04d0-c9d0-4fbd-af81-667742e4458b | 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"} | [
0.008136582560837269,
0.011074296198785305,
-0.13571429252624512,
0.0063652535900473595,
-0.025921670719981194,
0.0005286216037347913,
-0.022828850895166397,
0.05129880830645561,
-0.001770991599187255,
0.023818302899599075,
0.060127418488264084,
0.006213375832885504,
0.053307149559259415,
... |
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"} | [
-0.008372463285923004,
0.059076111763715744,
-0.08878105878829956,
-0.012763637118041515,
-0.024458741769194603,
-0.03043261729180813,
0.030323343351483345,
0.09008985757827759,
-0.0021582688204944134,
0.08051227033138275,
0.004349082708358765,
0.049920957535505295,
-0.055580127984285355,
... |
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"} | [
0.036277707666158676,
0.013533085584640503,
0.018333733081817627,
0.010725180618464947,
-0.09343738853931427,
-0.06646649539470673,
-0.03929757699370384,
0.04953204467892647,
-0.024923110380768776,
0.021587666124105453,
-0.042485546320676804,
-0.01856842078268528,
-0.007582885213196278,
-0... |
d0945144-5133-4d8f-8c00-6bf5c76ab7f4 | 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"} | [
0.06217716634273529,
0.0018247364787384868,
0.044260069727897644,
0.05215179920196533,
-0.04353339970111847,
-0.01947597786784172,
-0.05942735821008682,
0.018081799149513245,
-0.05069524794816971,
-0.003640625160187483,
0.03274328261613846,
-0.006062784232199192,
0.010593196377158165,
-0.0... |
8ef81dc8-ab35-4dc9-b8ba-b3f187f721e8 | 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"} | [
0.00570501247420907,
0.0483010895550251,
0.035705242305994034,
0.05515582486987114,
-0.01705794967710972,
-0.05974742770195007,
0.006742709316313267,
0.05507578328251839,
-0.03729771450161934,
0.018382275477051735,
0.04474371299147606,
-0.014881591312587261,
0.013123677112162113,
-0.074347... |
cd9ead96-2785-4b29-93cc-7d12a8be2341 | ```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.
... | {"source_file": "settings.md"} | [
-0.012298641726374626,
0.026429925113916397,
-0.01953311450779438,
0.026917116716504097,
-0.05093487352132797,
-0.05997389554977417,
-0.006475513800978661,
-0.03907647728919983,
-0.025214534252882004,
-0.055480536073446274,
0.07857474684715271,
-0.08291970938444138,
0.009797213599085808,
0... |
7a3daacb-1991-46cf-9c4e-45347b4ab72e | 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"} | [
0.009531427174806595,
-0.011798803694546223,
0.0296775009483099,
-0.05154876783490181,
0.013654815033078194,
-0.09197948127985,
0.01981084607541561,
0.0011714721331372857,
0.024581363424658775,
-0.004786856472492218,
0.0016780330333858728,
0.033033937215805054,
0.06275768578052521,
-0.0831... |
173efa54-3edb-4694-8006-a508950f55f8 | 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"} | [
-0.006533558014780283,
-0.0632341280579567,
-0.0013534777099266648,
0.04189935326576233,
0.04226871579885483,
-0.04458662122488022,
-0.04513523727655411,
-0.0013996417401358485,
-0.021585479378700256,
0.027155674993991852,
0.04858389496803284,
-0.0000498454573971685,
0.12684307992458344,
-... |
398a261e-d82b-44d5-b3f2-0056f0785d02 | 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... | {"source_file": "settings.md"} | [
-0.0036357969511300325,
0.01994883082807064,
-0.031144697219133377,
-0.034137021750211716,
-0.05108701437711716,
-0.06846283376216888,
-0.10202259570360184,
0.0853966474533081,
-0.06752350181341171,
0.015044279396533966,
-0.034779831767082214,
0.02421274036169052,
0.021176954731345177,
-0.... |
355f841b-480f-4160-be00-b96c38857b36 | 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"} | [
-0.03197869658470154,
0.05935845524072647,
-0.03493237867951393,
0.05952468886971474,
-0.042123351246118546,
-0.09419015794992447,
-0.08637754619121552,
0.007045125588774681,
-0.03906888887286186,
0.0018669173587113619,
0.008568721823394299,
0.07290370017290115,
0.017924249172210693,
-0.05... |
c8707e95-8e10-43e9-b748-b463eb9519a1 | 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"} | [
0.07126050442457199,
0.01164066232740879,
0.07706833630800247,
0.053340960294008255,
-0.04406764730811119,
-0.07459434121847153,
0.07993759959936142,
-0.01157689094543457,
-0.06153682619333267,
-0.055123455822467804,
0.06917162239551544,
-0.04039579629898071,
0.08197241276502609,
-0.151803... |
9003609d-b950-430e-8a46-b697aa9842f7 | 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"} | [
-0.012427149340510368,
-0.04948253929615021,
-0.06547465920448303,
0.0849696546792984,
-0.03636133298277855,
-0.09553156048059464,
0.04018263891339302,
-0.07384945452213287,
-0.037038251757621765,
0.03633831813931465,
0.10938183218240738,
-0.06547778099775314,
0.07955522835254669,
-0.05492... |
7a0b8948-ed73-4eaa-92a1-d3eb7318a20c | 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"} | [
-0.09005913883447647,
-0.040356624871492386,
0.025331685319542885,
0.013127228245139122,
-0.01774386502802372,
-0.06302706897258759,
-0.018637128174304962,
0.018529566004872322,
0.018018385395407677,
0.030496060848236084,
0.09825611859560013,
-0.0010731132933869958,
0.07387275248765945,
-0... |
df8a0da8-3737-4177-82e4-ea84e43691ab | 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"} | [
0.0030690510757267475,
0.028580965474247932,
-0.04333149641752243,
0.061593882739543915,
-0.04484843462705612,
-0.030597150325775146,
-0.03085629642009735,
0.028901346027851105,
0.01360240951180458,
0.024222012609243393,
0.025019461289048195,
0.0030314933974295855,
0.0888470932841301,
-0.0... |
31332672-443b-41df-834d-7e4f5ac12c63 | 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"} | [
-0.053207505494356155,
-0.0723056048154831,
-0.004820632748305798,
0.03022395633161068,
-0.12271016091108322,
-0.001720884582027793,
-0.09207095205783844,
-0.10027679800987244,
0.01978651061654091,
0.02755141444504261,
0.08186568319797516,
-0.011050460860133171,
0.04289622977375984,
-0.051... |
dabc074b-ce33-4f23-a666-11475d2e031c | 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... | {"source_file": "settings.md"} | [
0.09390343725681305,
-0.003503042971715331,
-0.09483516961336136,
0.020326752215623856,
-0.023509811609983444,
-0.054637361317873,
0.11207857728004456,
0.00635862909257412,
-0.0867789089679718,
0.026097185909748077,
0.022833075374364853,
-0.03410466015338898,
0.03193921223282814,
-0.074468... |
e2f1a2bb-d89a-4385-92fc-9836929cac56 | 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"} | [
0.0034666373394429684,
-0.003915888257324696,
0.023401131853461266,
-0.008950239047408104,
-0.04279494658112526,
-0.09538157284259796,
-0.05178508907556534,
0.02905449829995632,
-0.06789734959602356,
0.03313148021697998,
0.03290652111172676,
0.1141049936413765,
0.004103128798305988,
-0.058... |
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"} | [
0.009438730776309967,
0.0019902782514691353,
-0.06759750843048096,
-0.00914773065596819,
-0.042319972068071365,
-0.0527803935110569,
0.0011988538317382336,
0.058595191687345505,
-0.08194724470376968,
-0.013086351566016674,
-0.036245763301849365,
0.04286568611860275,
0.05405742675065994,
-0... |
6e97753a-a242-434b-9c92-d0bfcb330d35 | 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"} | [
-0.0022463782224804163,
0.00836662296205759,
-0.07193209230899811,
0.033990949392318726,
-0.06100738048553467,
-0.05278129130601883,
-0.029562795534729958,
0.026309385895729065,
-0.0065254527144134045,
0.0020668902434408665,
0.020324716344475746,
-0.0957861915230751,
0.05624318867921829,
-... |
b4bf3865-d86b-4792-85f6-2f622447cab1 | lightweight_deletes_sync {#lightweight_deletes_sync}
The same as
mutations_sync
, but controls only execution of lightweight deletes.
Possible values:
| Value | Description ... | {"source_file": "settings.md"} | [
-0.0970466285943985,
-0.010362133383750916,
-0.044627558439970016,
0.06296366453170776,
0.06881897151470184,
-0.09286613017320633,
0.04472782462835312,
-0.12288585305213928,
0.07003526389598846,
0.004262149333953857,
0.08148893713951111,
-0.022546060383319855,
0.05187561362981796,
-0.08638... |
81826fc2-888e-4fdc-b613-aae317125d4a | 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"} | [
-0.02078969217836857,
-0.056348465383052826,
-0.00263206590898335,
-0.017291462048888206,
-0.07407307624816895,
-0.08653052151203156,
-0.03107627108693123,
-0.021169569343328476,
0.069986492395401,
-0.055800795555114746,
-0.02900407277047634,
0.012464398518204689,
0.09965022653341293,
-0.1... |
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... | {"source_file": "settings.md"} | [
0.006733825895935297,
0.010797275230288506,
-0.05239855870604515,
0.018761923536658287,
0.02634790539741516,
-0.10302654653787613,
0.006112745963037014,
0.06203090772032738,
-0.019012102857232094,
0.06256913393735886,
0.0472080335021019,
0.11422526091337204,
-0.03651990368962288,
-0.009429... |
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"} | [
0.07833600789308548,
-0.035966020077466965,
-0.020892100408673286,
0.06685352325439453,
-0.012878893874585629,
-0.08714720606803894,
0.10015001893043518,
-0.0243573859333992,
-0.03868977725505829,
-0.010766055434942245,
0.01873260922729969,
-0.02601708099246025,
0.07783547788858414,
-0.016... |
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"} | [
0.08744841068983078,
0.002139993943274021,
-0.1436658650636673,
0.021876133978366852,
-0.07334697991609573,
-0.09782721102237701,
-0.01867366023361683,
0.006759790237993002,
-0.023320794105529785,
-0.003025972517207265,
0.02613000199198723,
0.02792387269437313,
0.04795648530125618,
-0.0083... |
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 ... | {"source_file": "settings.md"} | [
-0.00704648531973362,
-0.06892227381467819,
-0.018079698085784912,
0.015573738142848015,
-0.03184621408581734,
-0.10829025506973267,
-0.060815393924713135,
0.005978972185403109,
0.009960574097931385,
0.01939115673303604,
0.02104872837662697,
-0.042644061148166656,
0.07571111619472504,
-0.0... |
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"} | [
-0.0015338611556217074,
-0.0621892511844635,
-0.010220425203442574,
0.010871177539229393,
-0.03413422778248787,
-0.0269502941519022,
-0.034369707107543945,
0.06300380080938339,
0.053407516330480576,
0.0863099992275238,
0.014273076318204403,
0.11816142499446869,
0.023173972964286804,
-0.034... |
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"} | [
0.01907772570848465,
-0.062192171812057495,
-0.006276830565184355,
0.0419502891600132,
-0.012622877024114132,
-0.05900115892291069,
-0.05108623579144478,
0.06157126650214195,
0.040395691990852356,
0.08173349499702454,
-0.010186368599534035,
0.15359443426132202,
0.0626664012670517,
-0.04724... |
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"} | [
-0.0015376703813672066,
-0.01082246471196413,
-0.10069429874420166,
0.021518388763070107,
-0.1173398494720459,
-0.08419434726238251,
0.033018894493579865,
-0.006444115191698074,
-0.04305395856499672,
0.008007911033928394,
0.0016913405852392316,
0.02053944580256939,
0.05779208242893219,
-0.... |
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"} | [
0.007495091296732426,
0.0037102319765836,
-0.04873303696513176,
0.032241396605968475,
-0.02230348251760006,
-0.10787975043058395,
-0.009082915261387825,
-0.025701098144054413,
0.020115366205573082,
-0.015249131247401237,
-0.0005778616759926081,
0.03247447684407234,
-0.024509241804480553,
-... |
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"} | [
-0.020156338810920715,
0.0018143252236768603,
-0.08557046204805374,
-0.02890782244503498,
-0.036666497588157654,
-0.08965519070625305,
0.03867509961128235,
-0.05173999071121216,
0.013954251073300838,
-0.01171466987580061,
0.00954435020685196,
0.0660390630364418,
0.048541609197854996,
-0.05... |
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"} | [
-0.011512486264109612,
-0.049225129187107086,
0.01510972622781992,
-0.016570085659623146,
-0.06318444758653641,
-0.0632527768611908,
-0.06778507679700851,
0.03780721500515938,
-0.011873899027705193,
0.022717086598277092,
0.04208063334226608,
0.039610303938388824,
0.012544930912554264,
-0.0... |
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"} | [
-0.021005695685744286,
-0.07925360649824142,
0.008931664749979973,
0.006448377855122089,
0.006727209314703941,
-0.07198721170425415,
-0.06814936548471451,
0.07044654339551926,
0.0361284501850605,
-0.011237485334277153,
-0.013385549187660217,
0.002322000451385975,
0.02790922485291958,
0.003... |
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"} | [
-0.0037640961818397045,
-0.06493455916643143,
-0.06039881706237793,
-0.004836931359022856,
-0.03995325043797493,
-0.06774672865867615,
-0.054113712161779404,
0.12127599865198135,
0.006713788025081158,
0.04968709126114845,
-0.0325298085808754,
0.08057337254285812,
0.012839186936616898,
-0.0... |
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"} | [
-0.013199594803154469,
-0.02635236643254757,
-0.0424707867205143,
0.029161542654037476,
-0.057334184646606445,
-0.03511606156826019,
0.0478341318666935,
0.021567123010754585,
-0.07365711778402328,
-0.018089331686496735,
-0.022070422768592834,
0.06798499077558517,
0.0482918918132782,
-0.076... |
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... |
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