mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-11-25 17:12:03 +00:00
30 lines
941 B
Markdown
30 lines
941 B
Markdown
---
|
|
toc_priority: 65
|
|
toc_title: Caches
|
|
---
|
|
|
|
# Cache Types {#cache-types}
|
|
|
|
When performing queries, ClichHouse 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.
|
|
|
|
Indirectly used:
|
|
|
|
- OS page cache.
|
|
|
|
To drop cache, use [SYSTEM DROP ... CACHE](../sql-reference/statements/system.md) statements.
|
|
|
|
[Original article](https://clickhouse.tech/docs/en/operations/caches/) <!--hide-->
|