Redis bgrewriteaof command

I. background

1. aof:

Redis's aof mechanism is a bit similar to MySQL BINLOG, which is a persistent method provided by redis (the other is RDB). It will write all the commands at a certain frequency (no, always, every seconds) is written to the log file, and the database is restored after redis is stopped and restarted.

 

2. aof rewrite:

(1) As the aof file grows larger, most of the commands are repeated or can be merged (100 incr = set key 100)

(2) benefits of rewriting: reduces aof log size, reduces memory usage, and accelerates database recovery time.

Example:

The basic syntax of the redis bgrewriteaof command is as follows:

# Redis-cli-P 6379-H 127.0.0.1127.0.0.1: 6379> bgrewriteaofredis 127.0.0.1: 6379> background append only file rewriting started

Check that the aof file has become smaller.

 

Redis bgrewriteaof command