: Is there any way to invalidate all memcache entries that begin with "User*"? I recently made a change to my User class (which is memcached); is there any way I can invalidate all entries whose

@Dunderdale272

In the memcached FAQ, Deleting by Namespace:


While memcached does not support any
type of wildcard deleting or deletion
by namespace (since there are not
namespaces), there are some tricks
that can be used to simulate this.
They do require extra trips to the
memcached servers however.

Example, in PHP, for using a namespace
called foo:


$ns_key = $memcache->get("foo_namespace_key");
// if not set, initialize it
if($ns_key===false) $memcache->set("foo_namespace_key", rand(1, 10000));
// cleverly use the ns_key
$my_key = "foo_".$ns_key."_12345";
$my_val = $memcache->get($my_key);

//To clear the namespace do:
$memcache->increment("foo_namespace_key");


If you are planning on doing a blanket clear of only part of the cache, you might consider setting the expiry to a shorter time period.

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