Comments on: New versions of LatchProf and LatchProfX for latch contention troubleshooting and tuning http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/?utm_source=rss&utm_medium=rss&utm_campaign=new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning Oracle, Exadata, Performance, Troubleshooting - Mobile Life and Productivity. Wed, 08 Feb 2012 08:03:50 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Latch statistics « Latch, mutex and beyond http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-6435 Latch statistics « Latch, mutex and beyond Sat, 26 Feb 2011 11:45:41 +0000 http://blog.tanelpoder.com/?p=620#comment-6435 [...] Poisson arrivals approximation. can be independently measured by sampling of v$latchholder. The latchprofx.sql script by Tanel Poder do this at high frequency. Within our accuracy we can expect that and [...] [...] Poisson arrivals approximation. can be independently measured by sampling of v$latchholder. The latchprofx.sql script by Tanel Poder do this at high frequency. Within our accuracy we can expect that and [...]

]]> By: Tanel Poder http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-6426 Tanel Poder Wed, 23 Feb 2011 20:46:43 +0000 http://blog.tanelpoder.com/?p=620#comment-6426 <a href="#comment-6421" rel="nofollow">@fabio</a> Use this instead: http://files.e2sn.com/scripts/latchprofx.sql @fabio

Use this instead:

http://files.e2sn.com/scripts/latchprofx.sql

]]> By: fabio http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-6421 fabio Tue, 22 Feb 2011 22:17:45 +0000 http://blog.tanelpoder.com/?p=620#comment-6421 Tanel, I am getting a broken link for http://www.tanelpoder.com/files/scripts/latchprofx.sql Not sure if the issue is only mine. Thanks, Fabio Tanel,
I am getting a broken link for

http://www.tanelpoder.com/files/scripts/latchprofx.sql

Not sure if the issue is only mine.
Thanks,
Fabio

]]> By: Tanel Poder http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-4534 Tanel Poder Tue, 04 May 2010 22:53:24 +0000 http://blog.tanelpoder.com/?p=620#comment-4534 Can you run latchprofx with the "func" parameter to see the function name, maybe these are not regular buffer gets. Also, what's your statistics_level? Can you run latchprofx with the “func” parameter to see the function name, maybe these are not regular buffer gets. Also, what’s your statistics_level?

]]> By: Laurent DEMARET http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-4531 Laurent DEMARET Tue, 04 May 2010 15:54:14 +0000 http://blog.tanelpoder.com/?p=620#comment-4531 Hi Tanel, How could you explain OBJECT column for cache buffers chains is null? SQL> @latchprofx sid,name,sqlid,object % % 10000 -- LatchProfX 2.00 by Tanel Poder ( http://www.tanelpoder.com ) SID NAME SQLID OBJECT Held Gets Held % Held ms Avg hold ms ---------- ----------------------------------- ------------- ----------------- ---------- ---------- ------- ----------- ----------- 4287 cache buffers chains 8y6ha22yq8p6b 0 351 343 3.51 2093.715 6.104 1631 cache buffers chains 61ttqqkq6gkrd 0 263 263 2.63 1568.795 5.965 4287 cache buffers lru chain 8y6ha22yq8p6b 0 172 168 1.72 1025.980 6.107 4118 cache buffers chains 6mwubjwmzs5gj 0 76 76 .76 453.340 5.965 1631 cache buffers lru chain 61ttqqkq6gkrd 0 48 48 .48 286.320 5.965 Hi Tanel,

How could you explain OBJECT column for cache buffers chains is null?

SQL> @latchprofx sid,name,sqlid,object % % 10000

– LatchProfX 2.00 by Tanel Poder ( http://www.tanelpoder.com )

SID NAME SQLID OBJECT Held Gets Held % Held ms Avg hold ms
———- ———————————– ————- —————– ———- ———- ——- ———– ———–
4287 cache buffers chains 8y6ha22yq8p6b 0 351 343 3.51 2093.715 6.104
1631 cache buffers chains 61ttqqkq6gkrd 0 263 263 2.63 1568.795 5.965
4287 cache buffers lru chain 8y6ha22yq8p6b 0 172 168 1.72 1025.980 6.107
4118 cache buffers chains 6mwubjwmzs5gj 0 76 76 .76 453.340 5.965
1631 cache buffers lru chain 61ttqqkq6gkrd 0 48 48 .48 286.320 5.965

]]> By: Shervin http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-3897 Shervin Sat, 20 Feb 2010 16:45:39 +0000 http://blog.tanelpoder.com/?p=620#comment-3897 Hi, Thanks for sharing this, As I reviewed the code, I found that it reports the number of times latches are got by sessions, it does not show that how many total gets occured in each sample. What if a session in one sample has 100 gets ? do you think that it could be misleading ? Do you assume that each sample run so quick that make this possibility low .... Thanks Hi,

Thanks for sharing this, As I reviewed the code, I found that it reports the number of times latches are got by sessions, it does not show that how many total gets occured in each sample. What if a session in one sample has 100 gets ? do you think that it could be misleading ? Do you assume that each sample run so quick that make this possibility low ….

Thanks

]]> By: yasser http://blog.tanelpoder.com/2010/02/15/new-versions-of-latchprof-and-latchprofx-for-latch-contention-troubleshooting-and-tuning/comment-page-1/#comment-3864 yasser Tue, 16 Feb 2010 08:35:46 +0000 http://blog.tanelpoder.com/?p=620#comment-3864 Thanks for sharing wonderful tool latchprof. How did you simulate CBC latch contention?? Just wanted to know as i am preparing for an seminar on CBC latch with live examples... Will be thankful if you can provide me any simulation script or idea on CBC latch.. Thanks for sharing wonderful tool latchprof.

How did you simulate CBC latch contention?? Just wanted to know as i am preparing for an seminar on CBC latch with live examples…

Will be thankful if you can provide me any simulation script or idea on CBC latch..

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