Memcached Object Cache
Memcached Object Cache provides a persistent backend for the WordPress object cache. A memcached server and the PECL memcache extension are required.
About this tool.
Memcached Object Cache provides a persistent backend for the WordPress object cache. A memcached server and the PECL memcache extension are required.
Getting started.
- 01Install memcached on at least one server. Note the connection info. The default is 127.0.0.1:11211 .
- 02Install the PECL memcache extension
- 03Copy object-cache.php to wp-content
- 04Add the WP_CACHE_KEY_SALT constant to the wp-config.php : php define( 'WP_CACHE_KEY_SALT', '...long random string...' );
This helps prevent cache pollution when multiplte WordPress installs are using the same Memcached server. The value must be unique for each WordPress install.
Frequently asked questions.
How can I manually specify the memcached server(s)?
Add something similar to the following to wp-config.php above /* That's all, stop editing! Happy blogging. */ :
$memcached_servers = array( 'default' => array( '10.10.10.20:11211', '10.10.10.30:11211' ) );
The top level array keys, are cache groups, where ‘default’ corresponds to any cache group that is not explicitly defined. This allows for specifying memcached servers that only handle certain cache groups. The most common use is only specifying ‘default’.
Possible cache groups are:
{$taxonomy}_relationships {$meta_type}_meta {$taxonomy}_relationships blog-details blog-id-cache blog-lookup bookmark calendar category comment counts general global-posts options plugins post_ancestors post_meta posts rss site-lookup site-options site-transient terms themes timeinfo transient user_meta useremail userlogins usermeta users userslugs widget
