MySQL AND memcached for PHP sessions?

I refer you to Dormando's oft-cited explanation of how to store sessions in MySQL with memcached caching . The original LiveJournal post is more wordy but more thoroughly explains why storing sessions in memcached only is a bad idea.

Sessions it's a temporary thing, there is nothing to worry about if once per month memcache-server will fail and truncate sessions. I'm sure you can use just memcache for sessions, without replication in DB.

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