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.

Return value

Simple string reply

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