mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-21 09:10:48 +00:00
31 lines
959 B
Markdown
31 lines
959 B
Markdown
---
|
|
sidebar_position: 65
|
|
sidebar_label: Caches
|
|
---
|
|
|
|
# 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.
|
|
|
|
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-->
|