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Mutexes in Oracle Database

edited May 6, 2013 5:41PM in Database Tuning (MOSC) 3 commentsAnswered

All,
This thread can be used as the discussion thread for the recent advisor webcast: Mutexes in Oracle Database held on Apr 30 2013.

The summary of the Q&A section is listed below.

Is mutexes going to replace latches in future?
On 10g we had replaced latches with mutexes for certain operations . In 11g, we have replaced lots of latches on library cache into mutex mechanisms. Currently we had only looked into library cache latches only.

Can you explain more accurately the notion of "child version count" please?
SQL statement having more than 1 plan hash value is called version count.
When the SQL has many child cursors under the same parent cursor, the no.of child cursors is the version count. A Version is referred as a child cursor.

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