caches: use safer method of purging keys from memory dict. During some concurrency tests...

caches: use safer method of purging keys from memory dict. During some concurrency tests we detected that has_key has a race condition, and catching exception is safer.

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Increase Database Performance

For tuning PostgreSQL we recommend reading: http://www.revsys.com/writings/postgresql-performance.html

For tuning MySQL we recommend reading: http://www.tecmint.com/mysql-mariadb-performance-tuning-and-optimization/

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