Really interesting read about how to examine what’s stored in memcached.
Peep uses ptrace to freeze a running memcached server, dump the internal key metadata, and return the server to a running state. If you have a good host ejection mechanism in your client, such as in the Twitter libmemcached builds, you won’t even have to change the production server pool. The instance is not restarted, and no data is lost.
Quick look at MySQL 5.4Highlights include scalability improvements, subquery optimizations and join improvements, improved stored procedure management, out parameters in prepared statements, and new information schema additions.
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