So I apologize to all you SQL Profiles available who have already been lumped with each other by my prejudiced watch, just as a result of functions of a few of your brethren (i.e. the ones created through the SQL Tuning Advisor).
Also, 11g has lots additional to contemplate when optimizing a press release because of SPM. Will you be on 11g by any prospect? You can usually “Wolfgang” the statement. A 10053 trace will provide you with a great deal of data on why it chose to not make use of the SQL Profile, if you can find it to reproduce the actions.
Notice that on the 25th of Jan at 10am there was a strategy transform and buffer will get shot throughout the roof, at 16:00 we ran your sql script finding a former hash approach benefit plus the timings returned to typical.
If you have successfully made a SQL Profile on a press release, it ought to go on to receive utilized unless something changes the text of your assertion, which certainly would change the sql_id in addition, or something alterations to avoid the SQL Profile hints from Doing work. In that circumstance I believe the Profile would continue to be employed although the non-legitimate trace will be ignored (I haven’t examined that while).
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Histograms might be problematic in 10g (a lot of and tiny sample sizes). So a radical review of such (probably getting rid of numerous and escalating the sample size on those you retain) is in ordered. But this can be a prolonged endeavor.
I'd not noticed that you could potentially get several kids with Not one of the flags in v$sql_shared_cursor becoming established to ‘Y’. I verified which you can, but I am not positive why that could manifest.
osborne suggests: June two, get redirected here 2009 at 6:38 pm It’s quite common to possess various little one cursors for a single sql_id. Generally they may have the identical system, but It is far from unheard of to possess distinct designs. This transpires frequently resulting from bind variable peeking. A typical scenario might be that a cursor gets invalidated by collecting stats. The next time it receives executed, a whole new cursor gets made as well as statement gets re-optimized. If your bind variables are distinct, a different prepare may end up. I’m positive you will discover other strategies This tends to transpire as well, but this 1 is rather popular (notably in 10g and that is overactive in it’s histogram generation, and below active within the sample size it makes use of to create them).
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The ones developed from the Tuning Advisor usually have hints that scale the costing calculations – these are the sort that often “sour” as time passes because the stats alter. I did a submit some time again about that listed here:
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