Redis data elimination strategy

Redis provides 6 data elimination strategies:

● volatile-ru: select the least recently used data elimination from datasets with an expiration time set

Volatile-lfu: delete the one that is least used for a period of time from the Keys that has been set to expire

● voltil-tt: selects recently expired data from datasets that have been set to expire

● volatile-random: randomly select data elimination from a dataset with an expiration time set

Allkeys-ru: select the least used data from the dataset to be eliminated

● llkeys-Ifu: removes the one that is least used for a period of time from all Keys

● alkeys-random: randomly selecting data from a dataset for elimination

● no-enviction (expulsion): expulsion data is prohibited (no phase-out strategy is used. The default is configured for this), for write

Operation, return error message

Suggestion: after understanding the elimination strategy of Redis, you should take the initiative to set / update the expire time of key when you use it.

Active elimination of inactive old data helps to improve query performance