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sidebar_position: 65
sidebar_label: Caches
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---
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# 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.
- `uncompressed_cache` — Cache of uncompressed data used by table engines of the [MergeTree ](../engines/table-engines/mergetree-family/mergetree.md ) family.
Additional cache types:
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- 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.
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- Schema inference 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-->
