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Delete all the keys of all the existing databases, not just the currently
selected one. This command never fails.
The time-complexity for this operation is O(N), N being the number of keys in
all existing databases.
## `FLUSHALL ASYNC` (Redis 4.0.0 or greater)
Redis is now able to delete keys in the background in a different thread without
blocking the server. An `ASYNC` option was added to `FLUSHALL` and `FLUSHDB` in
order to let the entire dataset or a single database to be freed asynchronously.
Asynchronous `FLUSHALL` and `FLUSHDB` commands only delete keys that were
present at the time the command was invoked. Keys created during an asynchronous
flush will be unaffected.
@return
@simple-string-reply
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