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This article mainly introduces several ways to persist redis, which can be used for reference. I hope you can learn a lot after reading this article. Let's take a look at it.

How many ways are there to persist redis?

A: there are two main ways:

1) Snapshot persistence

It has been turned on automatically in the redis configuration file

The format is: save N M

It means that if redis is modified at least M times within N seconds, redis will take a snapshot to disk.

Of course, we can also manually execute save or bgsave (asynchronous) commands to take snapshots.

2) append only file AOF persistence

There are three modes, such as

Appendfsync everysec defaults to force writing to disk once per second

Appendfsync always forces it to write to disk every time it performs a write operation

Appendfsync no depends entirely on os. Performance is the best, but persistence is not guaranteed.

The third mode is the best. Redis also takes the third mode by default.

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