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slug | sidebar_position | sidebar_label | title | description |
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/en/operations/caches | 65 | Caches | Cache Types | When performing queries, ClickHouse uses different caches. |
When performing queries, ClickHouse 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.- Operating system page cache (used indirectly, for files with actual data).
Additional cache types:
- DNS cache.
- Regexp cache.
- Compiled expressions cache.
- Avro format schemas cache.
- Dictionaries data cache.
- Schema inference cache.
- Filesystem cache over S3, Azure, Local and other disks.
- (Experimental) Query cache.
To drop one of the caches, use SYSTEM DROP ... CACHE statements.