FLUSHDB

Delete all the keys of the currently selected DB. This command never fails.

By default, FLUSHDB will synchronously flush all keys from the database. 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.