Shulou(Shulou.com)06/01 Report--

What should I do to persist redis? Maybe you are no stranger to redis, or you have never known redis. But don't worry, today the editor will explain the principle of redis persistence with the simplest description.

Redis is an advanced key-value database. It is similar to memcached, except that data can be persisted and supports a wide range of data types. There are strings, linked lists, sets and ordered collections. Support in the server-side calculation of the collection union, intersection and complement set (difference), etc., but also supports a variety of sorting functions. So Redis can also be seen as a data structure server.

All data in Redis is stored in memory and then saved to disk asynchronously from time to time (this is called "semi-persistent mode"); each data change can also be written to an append only file (aof) (this is called "full persistence mode").

Since the data of Redis is stored in memory, if persistence is not configured, all data will be lost after redis restart, so you need to enable the persistence feature of redis to save the data to disk. When redis restarts, you can recover the data from disk. Redis provides two ways for persistence, one is RDB persistence (the principle is to dump the database records of Reids in memory regularly to RDB persistence on disk), and the other is AOF (append only file) persistence (the principle is to write the operation log of Reids to a file in an appended way).

Redis differs from memcache in that the data stored in Redis is persistent and will not be lost after a power outage or restart. Because the storage of Redis is divided into three parts: memory storage, disk storage and log files, after restart, Redis can reload data from disk into memory, which can be configured through configuration files. Because of this, Redis can be persisted.

The above is how to make redis persistence easier to do a brief introduction, of course, the detailed use of the above differences have to be used by everyone to understand. If you want to know more, welcome to follow the industry information channel!

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