Memcache driver stores cache records into a memcached server. Memcached is a high-performance, distributed memory object caching system. In order to use this backend, you need a memcached daemon and the memcache PECL extension.
The Alternative PHP Cache (APC) is a free and open opcode cache for PHP. It was conceived of to provide a free, open, and robust framework for caching and optimizing PHP intermediate code.
The APC cache driver of Doctrine stores cache records in shared memory.
+++ Sqlite
Sqlite caching backend stores cache records into sqlite database.
