Comments on: Investigating Enqueues Burns CPU Cycles http://hoopercharles.wordpress.com/2011/03/30/investigating-enqueues-burns-cpu-cycles/ Miscellaneous Random Oracle Topics: Stop, Think, ... Understand Mon, 13 May 2013 14:10:06 +0000 hourly 1 http://wordpress.com/ By: Charles Hooper http://hoopercharles.wordpress.com/2011/03/30/investigating-enqueues-burns-cpu-cycles/#comment-3135 Fri, 29 Apr 2011 15:13:05 +0000 http://hoopercharles.wordpress.com/?p=4715#comment-3135 Coskan,

Thank you for your view on the blog article – it might be interesting to see how the GV$ views compare to the V$ views in terms of performance.

Do you happen to remember if V$LOCK was showing identical values for the ID1, ID2, and TYPE columns for the two sessions – I understand that if the ID1 and ID2 columns are identical, but the TYPE columns are different, one session may not be blocking the other. If I remember correctly, that requirement was discussed in one of the blog articles on this site, it might have been this one:
http://hoopercharles.wordpress.com/2010/06/03/lock-watching-what-is-wrong-with-this-sql-statement/

]]> By: coskan gundogar http://hoopercharles.wordpress.com/2011/03/30/investigating-enqueues-burns-cpu-cycles/#comment-3131 Fri, 29 Apr 2011 00:49:31 +0000 http://hoopercharles.wordpress.com/?p=4715#comment-3131 If I need to see blocking sessions only, I always use v$session.

As your tests already revealed that it is the min consumer I wonder how the resultset will be when you query gv$ tables for finding global blockers on RAC systems

I also need to say I saw a case where v$lock shows blocking (which was true) but at the same time v$session did not, which was a bit weird and looked like a bug which I don’t have a test case for :(

]]> By: Log Buffer #215, A Carnival of the Vanities for DBAs | The Pythian Blog http://hoopercharles.wordpress.com/2011/03/30/investigating-enqueues-burns-cpu-cycles/#comment-3018 Fri, 01 Apr 2011 22:12:40 +0000 http://hoopercharles.wordpress.com/?p=4715#comment-3018 [...] speak for themselves – just the fact that they have been written after lot of hard work. Charles Hooper is in the habit of producing such gems regularly. Here is another one from him to relish over the [...]

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