ClickHouse/docs/en/operations/caches.md

---
slug: /en/operations/caches
sidebar_position: 65
sidebar_label: Caches
title: "Cache Types"
---

When performing queries, ClickHouse uses different caches.

Main cache types:

- `mark_cache` — Cache of marks used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.
- `uncompressed_cache` — Cache of uncompressed data used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.

Additional cache types:

- DNS cache.
- [Regexp](../interfaces/formats.md#data-format-regexp) cache.
- Compiled expressions cache.
- [Avro format](../interfaces/formats.md#data-format-avro) schemas cache.
- [Dictionaries](../sql-reference/dictionaries/index.md) data cache.
- Schema inference cache.
- [Filesystem cache](storing-data.md) over S3, Azure, Local and other disks.

Indirectly used:

- OS page cache.

To drop cache, use [SYSTEM DROP ... CACHE](../sql-reference/statements/system.md) statements.

[Original article](https://clickhouse.com/docs/en/operations/caches/) <!--hide-->
First draft 2021-01-16 20:00:00 +00:00			`---`
add slugs 2022-08-28 14:53:34 +00:00			`slug: /en/operations/caches`
Removed /ja folder, cleaned up /ru markdown 2022-04-09 13:29:05 +00:00			`sidebar_position: 65`
			`sidebar_label: Caches`
replace symlinks 2022-08-29 16:19:50 +00:00			`title: "Cache Types"`
First draft 2021-01-16 20:00:00 +00:00			`---`

Update caches.md spelling 2022-05-31 15:46:53 +00:00			`When performing queries, ClickHouse uses different caches.`
First draft 2021-01-16 20:00:00 +00:00
			`Main cache types:`
Edit and translate Поправил английскую версию и выполнил перевод. 2021-02-14 11:14:39 +00:00
First draft 2021-01-16 20:00:00 +00:00			- `mark_cache` — Cache of marks used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.
			- `uncompressed_cache` — Cache of uncompressed data used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.

			`Additional cache types:`
Edit and translate Поправил английскую версию и выполнил перевод. 2021-02-14 11:14:39 +00:00
			`- DNS cache.`
			`- [Regexp](../interfaces/formats.md#data-format-regexp) cache.`
			`- Compiled expressions cache.`
			`- [Avro format](../interfaces/formats.md#data-format-avro) schemas cache.`
			`- [Dictionaries](../sql-reference/dictionaries/index.md) data cache.`
Refactor, remove TTL, add size limit, add system table and system query 2022-08-05 16:20:15 +00:00			`- Schema inference cache.`
Add documentation for cache 2022-09-07 11:04:44 +00:00			`- [Filesystem cache](storing-data.md) over S3, Azure, Local and other disks.`
First draft 2021-01-16 20:00:00 +00:00
Minor fix 2021-01-21 20:56:29 +00:00			`Indirectly used:`
Edit and translate Поправил английскую версию и выполнил перевод. 2021-02-14 11:14:39 +00:00
			`- OS page cache.`
First draft 2021-01-16 20:00:00 +00:00
Link to DROP CACHE statements 2021-01-22 06:53:11 +00:00			`To drop cache, use [SYSTEM DROP ... CACHE](../sql-reference/statements/system.md) statements.`

find . -type f -name '*.md'\| xargs -I{} perl -pi -e 's\|https://clickhouse.tech\|https://clickhouse.com\|g' {} 2021-09-19 20:05:54 +00:00			`[Original article](https://clickhouse.com/docs/en/operations/caches/) <!--hide-->`