# About Cache of RocksDB

**URL:** <https://forums.percona.com/t/about-cache-of-rocksdb/6649>\
**Category:** Other MySQL® Questions\
**Created:** [October 23, 2018, 10:30pm UTC](https://forums.percona.com/t/about-cache-of-rocksdb/6649 "2018-10-23T22:30:23Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![fuzhiyu](https://avatars.discourse-cdn.com/v4/letter/f/90db22/32.png) [@fuzhiyu](https://forums.percona.com/u/fuzhiyu)\
**Post date:** [October 23, 2018, 10:30pm UTC](https://forums.percona.com/t/about-cache-of-rocksdb/6649/1 "2018-10-23T22:30:23Z")

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RocksDB provides some caches.

like LRUCache BlockCacheTier(inheritance PersistentCacheTier)

I want to know what these caches do.

LRUCache increases the rate of reading, is that right?

what BlockCacheTier does?