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27 lines
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Markdown
27 lines
1.0 KiB
Markdown
---
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slug: /en/operations/caches
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sidebar_position: 65
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sidebar_label: Caches
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title: "Cache Types"
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---
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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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- Operating system page cache (used indirectly, for files with actual data).
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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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- Schema inference cache.
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- [Filesystem cache](storing-data.md) over S3, Azure, Local and other disks.
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To drop one of the caches, use [SYSTEM DROP ... CACHE](../sql-reference/statements/system.md#drop-mark-cache) statements.
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