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| toc_priority | toc_title |
|---|---|
| 65 | Caches |
Cache Types
When performing queries, ClichHouse uses different caches.
Main cache types:
mark_cache— Cache of marks used by table engines of the MergeTree family.uncompressed_cache— Cache of uncompressed data used by table engines of the MergeTree family.
Additional cache types:
- DNS cache.
- Regexp cache.
- Compiled expressions cache.
- Avro format schemas cache.
- Dictionaries data cache.
Indirectly used:
- OS page cache.
To drop cache, use SYSTEM DROP ... CACHE statements.