Memcached flush_all command is used to clear all key=>value(key=>value) pairs in the cache.

This command provides an optional parameter time, which is used to clear the cache after the specified time.

Syntax:

The basic syntax format of the flush_all command is as follows: 

flush_all [time] [noreply]

Example

Clear cache:

set php 0 900 9
memcached
STORED
get php
VALUE php 0 9
memcached
END
flush_all
OK
get php
END