How to disable Redis RDB and AOF?

If you want to change the redis that is running, log into the redis, and

disable the aof:

config set appendonly no

disable the rdb:

config set save ""

If you want to make these changes effective after restarting redis, using

config rewrite

to make these changes to redis conf file.

If your redis have not started, just make some changes to redis.conf,

appendonly no
save ""

make sure there are no sentences like "save 60 1000" after the upper sentences, since the latter would rewrite the former.

Update: please look at Fibonacci's answer. Mine is wrong, although it was accepted.

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Commenting the "dbfilename" line in redis.conf should do the trick.