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27 lines
932 B
Markdown
27 lines
932 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, ClichHouse 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 data cache](../sql-reference/dictionaries/index.md)
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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.tech/docs/en/operations/caches/) <!--hide-->
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