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I have been doing performance tuning to one of my twitter app and I see "Init DB" in the slow_log table in mysql 5.1.

Can someone please tell me what does that mean.

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Init DB occurs when selecting a database. In PHP it would be mysql_select_db("dbname")

Typically, this should not show up in a slow query log, however, if long_query_time is set to 0, the slow query log will log all queries much like the general log.

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