memflush
SYNOPSIS
memflush [options]
Reset a server or list of servers
DESCRIPTION
memflush resets the contents of memcached(1) servers.
Warning
This means that all data in the specified servers will be deleted.
OPTIONS
- -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).
ENVIRONMENT
- MEMCACHED_SERVERS
Specify a list of servers.
NOTES
PROGRAM PREFIX
The prefix of this program is variable, i.e. it can be configured at build time.
Usually the client programs of libmemcached-awesome
are prefixed with mem
, like memcat
or memcp
.
It can be configured, though, to replace the prefix with something else like mc
, in case of that,
the client programs of libmemcached-awesome
would be called mccat
, mccp
, etc. respectively.