// less reliable. Use memcached where possible or if you encounter
// session problems. **
//
+// Please be aware that when selecting either Memcached or Memcache for sessions that it is advised to use a dedicated
+// memcache server. The memcache and memcached extensions do not provide isolated environments for individual uses.
+// Using the same server for other purposes (MUC for example) can lead to sessions being prematurely removed should
+// the other uses of the server purge the cache.
+//
// Following setting allows you to alter how frequently is timemodified updated in sessions table.
// $CFG->session_update_timemodified_frequency = 20; // In seconds.
//
