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Delete all the keys of the currently selected DB.
This command never fails.
By default, `FLUSHDB` will synchronously flush all keys from the database.
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 database asynchronously
* `!SYNC`: flushes the database synchronously
Note: an asynchronous `FLUSHDB` 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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