Comments on: High global cache waits on tab$ ? http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/ Discussions about Oracle performance tuning, RAC, Oracle internal & E-business suite. Sat, 11 May 2013 07:29:27 +0000 hourly 1 http://wordpress.com/ By: orainternals http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-221 Mon, 02 Mar 2009 15:26:56 +0000 http://orainternals.wordpress.com/?p=363#comment-221 Hi Tanel
Thanks for visiting my blog and thanks for sharing your knowledge.

]]> By: Tanel Poder http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-219 Sun, 01 Mar 2009 15:04:30 +0000 http://orainternals.wordpress.com/?p=363#comment-219 Another, less common, reason for duplicate data object ID’s is if you plug in a transportable tablespace from another database which happens to have segments with same data object IDs. This can also cause rowids’s to be non-unique…

http://blog.tanelpoder.com/2008/10/21/transportable-tablespaces-and-rowid-uniqueness/

]]> By: orainternals http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-217 Thu, 26 Feb 2009 14:35:43 +0000 http://orainternals.wordpress.com/?p=363#comment-217 Hi Kurt V M
Thanks for reading my blog.
That’s what I guessed too. But, I didn’t do enough tests to confirm that and so decided not to post about it. Thanks for confirming it.
BTW, I have great respect for you, especially, your tool DUDE( http://www.ora600.be/ ). One of these days, we will meet in some conference.

Cheers
Riyaj

]]> By: kurtvm http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-216 Thu, 26 Feb 2009 07:22:21 +0000 http://orainternals.wordpress.com/?p=363#comment-216 Dataobjectid 2 is a clustered table c_obj#.
As it’s a clustered table, its blocks can contain multible tables like (tab$,col$,…see sql.bsq) and hence, they have the same dataobjectid :-)

]]> By: orainternals http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-213 Wed, 25 Feb 2009 20:43:56 +0000 http://orainternals.wordpress.com/?p=363#comment-213 Hello
Thanks for reading my blog. Excellent point. Yes, I shouldn’t have used materialize hint. In this case, no_merge is working fine.
I will update it this blog..
Thanks for pointing out that.

Cheers
Riyaj

]]> By: Statistique http://orainternals.wordpress.com/2009/02/25/high-global-cache-waits-on-tab/#comment-212 Wed, 25 Feb 2009 20:37:05 +0000 http://orainternals.wordpress.com/?p=363#comment-212 Just my two cents … I was using select /*+ materialize */ hint in my WITH clause a lot before. But materialize is not an “official” hint. I’m using /*+ NO_MERGE (my_with_table) */ in the main select instead. The result is pretty much the same.

Great blog by the way !

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