BGREWRITEAOF

Instruct Redis to start an rewrite process. The rewrite will create a small optimized version of the current Append Only File.

If BGREWRITEAOF fails, no data gets lost as the old AOF will be untouched.

Specifically:

Since Redis 2.4 the AOF rewrite is automatically triggered by Redis, however the command can be used to trigger a rewrite at any time.

Simple string reply: A simple string reply indicating that the rewriting started or is about to start ASAP, when the call is executed with success.

The command may reply with an error in certain cases, as documented above.