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30 lines
940 B
Markdown
30 lines
940 B
Markdown
---
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toc_priority: 65
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toc_title: Caches
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---
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# Cache Types {#cache-types}
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When performing queries, ClickHouse uses different caches.
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Main cache types:
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- `mark_cache` — Cache of marks used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.
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- `uncompressed_cache` — Cache of uncompressed data used by table engines of the [MergeTree](../engines/table-engines/mergetree-family/mergetree.md) family.
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Additional cache types:
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- DNS cache.
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- [Regexp](../interfaces/formats.md#data-format-regexp) cache.
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- Compiled expressions cache.
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- [Avro format](../interfaces/formats.md#data-format-avro) schemas cache.
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- [Dictionaries](../sql-reference/dictionaries/index.md) data cache.
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Indirectly used:
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- OS page cache.
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To drop cache, use [SYSTEM DROP ... CACHE](../sql-reference/statements/system.md) statements.
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[Original article](https://clickhouse.com/docs/en/operations/caches/) <!--hide-->
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