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Delete all the keys of all the existing databases, not just the currently selected one.
This command never fails.
By default, `FLUSHALL` will synchronously flush all the databases.
Starting with Redis 6.2, setting the **lazyfree-lazy-user-flush** configuration directive to "yes" changes the default flush mode to asynchronous.
It is possible to use one of the following modifiers to dictate the flushing mode explicitly:
* `ASYNC`: flushes the databases asynchronously
* `!SYNC`: flushes the databases synchronously
Note: an asynchronous `FLUSHALL` command only deletes keys that were present at the time the command was invoked. Keys created during an asynchronous flush will be unaffected.
@return
@simple-string-reply
## Behavior change history
* `>= 6.2.0`: Default flush behavior now configurable by the **lazyfree-lazy-user-flush** configuration directive.
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