memflush - Man Page

memflush [options]

Reset a server or list of servers

memflush  resets the contents of memcached(1) servers.

WARNING:

-h|--help

Display help.

-V|--version

Display version.

-q|--quiet

Operate quietly.

-v|--verbose

Operate more verbosely.

-d|--debug

See -v|--verbose.

-s|--servers <list of servers>

Specify the list of servers as hostname[:port][,hostname[:port]...].

-n|--non-blocking

Enable non-blocking operations.

-N|--tcp-nodelay

Disable Nagle's algorithm.

-b|--binary

Enable binary protocol.

-B|--buffer

Buffer requests.

-u|--username <username>

Use username for SASL authentication.

-p|--password <password>

Use password for SASL authentication.

-e|--expire <expiration>

Use expiration seconds (or a UNIX timestamp).

NOTE:

Using an expiration time (period), all keys, which have not bean updated until expiration will cease to exist.

Quoting the memcached protocol documentation, it states:

Its effect is to invalidate all existing items immediately (by default) or after the expiration specified.  After invalidation none of the items will be returned in response to a retrieval command (unless it's stored again under the same key after flush_all has invalidated the items).

The most precise definition of what flush_all does is the following: it causes all items whose update time is earlier than the time at which flush_all was set to be executed to be ignored for retrieval purposes.

The intent of flush_all with a delay, was that in a setting where you have a pool of memcached servers, and you need to flush all content, you have the option of not resetting all memcached servers at the same time (which could e.g. cause a spike in database load with all clients suddenly needing to recreate content that would otherwise have been found in the memcached daemon).

MEMCACHED_SERVERS

Specify a list of servers.

memcached(1) libmemcached(3)

• C/C++ Client Library for memcached
• Wiping clean the contents of a server