Suggestions on what to read are always nice too. If I get no comments, i will guess that nobody loves me here! 20 Long Paragraphs to send to your Best Friend -. Please stay in my life forever because your friendship is one of the best things to ever happen. Top 100 Long Paragraphs to send to your Best Friend. If our friendship was essay to be a big beautiful building; I would be the ground, to protect you from every creepy thing and I would be the roof, to be a shade over you during the rainy day; I would 100 Paragraph for Best Friends. Who's your best friend and what does he or she mean to you? I'm sure you want to put a smile on his face always, and especially on his birthday.
It is very much up to what you have in the sql tuning Set! This is a very important thing to remember. Oracle suggests to migrate stored outlines to sql plan baselines! Oracle enables you to safely migrate from stored outlines to sql plan baselines. After the migration, you can maintain the same plan stability you had using stored outlines while being able to utilize the more advanced features provided by the sql plan Management framework. For more information, see migrating Stored Outlines to sql plan Baselines. I finally found the time to write down the books I want to eventually read. I'm going to put them in here, if you've read any of them, and they movie sucked, warn me ahead of time, so i don't bother.
I have looked into 100s of evolve sql plan Baseline reports and all looks so ambiguous. If you are still with me and need more fun click on Jed Walkers article. Making plans with Oracle 11g and not leaving them behind. Very good writing Jed! Going on a trip? Take the baselines with you. So, if select count from dba_sql_plan_baselines; returns nothing you are doing ok on this front. If not, here is how do wipe away all the baselines: Option 1: Bulk delete sql plan baselines Option 2: How to drop plans from spm repository but if you are still not convinced about the usage of (true or false then use the sql.
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Obviously, the plan did not pass the performance criterion. Oracle needs a compound improvement ratio bigger than.5 as a new plan must be at least.5 times better than the current baseline to be evolved with verification. Now, how is this compound improvement ratio calculated? I do not know the exact formula but what is taken into account are the ratios of Elapsed Time, cpu time, buffer Gets, disk reads, direct Writes and Fetches. Sql plan Managementand your Oracle 11g Upgrade, mike tefft supports sql plan Management. But looking at his slide 17, i wonder why Oracle fails the performance criterion: A few more nails in the sql plan baslines coffin: Sql Plan Baseline shaheed not always created: 788853.1. Ora-600 when bug: 12319228, ora-1403 when bug: 9157046, automatic capture of sql plan baselines generates excessive redo: Bug 10386337.
Zero plan loaded into spm from sql tuning set: Bug 10091254. Sql not being registered in the sql plan baseline: Bug 11077029. For me this is not a stable and most of all not a simple mechanism. Fixed plan, evolved plan, accepted plan, enabled plan, disabled plan. If it is up to me i will make it more simple and clear. And what is the story behind the way the compound improvement ratio is calculated?
Does not change the execution plan and has no effect whatsoever. Not until when Oracle eventually evolves the execution plans and accepts them. Oracle calls this a conservative plan selection strategy as the cbo preferentially uses a tried and tested execution plan even if the new plan looks like it might perform much better. This might have quite of an impact on the people doing manual tuning across the organization. If you have not yet read Maxym Kharchenkos article.
How to screw up your neighbor, please have a look. Note here that if a sql profile recommendation made by the automatic sql tuning task is implemented, the execution plan found by the sql tuning Task will be added as an accepted sql plan baseline. Interesting enough, only when the newer plan is proved to perform well will it be accepted for use. However, is cost the only criteria for an accepted plan? Have a look, this is output from. Why wasnt the one with lowest cost 31 evolved to an accepted one? Note that this is after running the automatic sql tuning task.
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In order to understand in detail how spm works, the best link is this white mom paper from Oracle called. Sql plan Management in Oracle database 11g. The following nice table is from mos: Reference note id 567104.1: As of now, june 2011, by just looking at the bugs above (if running below 12g i would say that the words locks, slowness and excessive space would be a very, very good indicators. If the information above is still not enough convincing why you should stay with the default of then go on reading. Reason Two : When doing hippie manual sql tuning, not all people might be aware that has been set to true. In fact, some may be but not totally comprehend the behavior of Oracle in this special case. Their frustration can escalate rather quickly when they notice that recalculating statistics, adding an index, etc.
Or at least heavily patched Oracle on Microsoft os (Oracle on Windows is another absurd but that is another story). And I would like to explain why by giving you two reasons on why not to touch the default value. Reason One : There is an Oracle bug 9910484 called: sql plan Management Capture uses excessive space in sysaux. And excessive here means gigabytes! I have seen sysaux growing really a lot. If you would like to recall what the parameter is all about, please check the following article from Pythian called. Wouldnt Automatic sql plan Management be the 11g killer app. In short, let me" the documentation: sql plan management is a preventative mechanism that records and evaluates the execution plans of sql statements over time, and builds sql plan baselines composed of a set of existing plans known to be efficient. The sql plan baselines are then used to preserve performance basket of corresponding sql statements, regardless of changes occurring in the system.
was gone." "I'll tell you. A friend in need is a friend indeed. I am talking about spm, sql plan Management. Or should I rather say that a friend in need is a friend to avoid. Maxym Kharchenko wrote a very interesting note entitled. How to screw up your neighbor. And considers his findings as a major bug. So, the direct question is: Should we set my answer. Unless you run Oracle.1 and above where you could consider.
What the characters of the four sisters were we will leave to best be found out. The clock struck six and, having swept up the hearth, beth put a pair of slippers down to warm. Somehow the sight of the old shoes had a good effect upon the girls, for Mother was coming, and everyone brightened to welcome her. Meg stopped lecturing, and lighted the lamp, Amy got out of the easy chair without being asked, and jo forgot how tired she was as she sat up to hold the slippers nearer to the blaze. "They are quite worn out. Marmee must have a new pair." "I thought I'd get her some with my dollar said Beth. "no, i shall!" cried Amy.
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Fifteen- year-old jo was very tall, thin, and brown, and reminded one of a colt, for she never seemed to know what to do with her long limbs, which were very much in her way. She had a decided mouth, a comical nose, and sharp, gray eyes, which appeared to see everything, and were by turns fierce, funny, or thoughtful. Her long, thick hair was her one beauty, but it was usually bundled into a net, to be out of her way. Round shoulders had jo, big hands and feet, a flyaway look to her clothes, and the uncomfortable appearance of a girl who was rapidly shooting up into a woman and didn't like. Elizabeth, or Beth, as everyone called her, was a rosy, smooth- haired, bright-eyed girl of thirteen, with a shy manner, a timid voice, and a peaceful expression which was seldom disturbed. Her father called her 'little miss Tranquility and the name suited her excellently, for she seemed to live in a happy world of her own, only venturing out to meet the few whom she trusted and loved. Amy, essay though the youngest, was a most important person, in her own opinion at least. A regular snow maiden, with blue eyes, and yellow hair curling on her shoulders, pale and slender, and always carrying herself like a young lady mindful of her manners.