What is PHP’s redis persistence mechanism?

The redis persistence mechanism stores data in memory to the hard disk to facilitate the persistence of data.

Redis supports two persistence methods, Snapshotting (snapshot) and Append-only file (AOF) method:

1. Snapshot is the default persistence method.

It writes the data in the memory into a binary file in the form of a snapshot. The default file name is dump.rdb.

2. AOF method

Since snapshots are taken at certain intervals, if redis goes down accidentally, all modifications after the last snapshot will be lost. If the application requires that no modifications can be lost, the aof persistence method can be used. AOF has better persistence because redis will append every received write command to the file through the write function. The default is append-only.aof

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