memflush - flush all data from a server¶
-Reset a server or list of servers
+memflush¶
DESCRIPTION¶
-memflush resets the contents of memcached(1) servers. -This means that all data in the specified servers will be deleted.
+memflush resets the contents of memcached(1) servers.
+Warning
+This means that all data in the specified servers will be deleted.
+OPTIONS¶
-You can specify servers via the option:
+-
+
-
+
--help¶
+ Display help.
+
-
+
-
+
--version¶
+ Display version.
+
-
+
-
+
--quiet¶
+ Operate quietly.
+
-
+
-
+
--verbose¶
+ Operate more verbosely.
+
-
-
--servers¶
-
--servers <list of servers>¶
+Specify the list of servers as hostname[:port][,hostname[:port]...].
+or via the environment variable:
--
-
-
-
`MEMCACHED_SERVERS`¶
-
-
+
-
+
--binary¶
+ Enable binary protocol.
+
For a full list of operations run the tool with option:
-
-
-
-
--help¶
-
--username <username>¶Use username for SASL authentication.
+-
+
-
+
--password<password>¶
+ Use password for SASL authentication.
+
-
+
-
+
--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).
+