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After you start the Redis-server using:service redis-server start --port 8000 or redis-server.

Use redis-cli -p 8000 to connect to the server as a client in a different terminal.

You can use either

1. FLUSHDB - Delete all the keys of the currently selected DB. This command never fails. The time-complexity for this operation is O(N), N being the number of keys in the database.
2. FLUSHALL - 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.

Check the documentation for ASYNC option for both.

If you are using Redis through its python interface, use these two functions for the same functionality:

def flushall(self): "Delete all keys in all databases on the current host" return self.execute_command('FLUSHALL') 

def flushdb(self): "Delete all keys in the current database" return self.execute_command('FLUSHDB')