Find people to KEEP pool
Hellorecently, a DBA I know has asked to make a list of candidates to KEEP pool in the buffer cache. He is not familiar with the application. Is there a way to do automated, or is - something that only a person familiar with the business logic can do manually?
I googled a little on the subject, but haven't found much, with the exception of Mr. Burleson scripts (which has a history silly advice so I don't him trust) theoretical or general discussions (like the thread on AskTom). I am interested in someone who has made (or learned why this cannot be done) is sharing his experience.
Thanks in advance!
Best regards
Nikolai
Nikolay Savvinov wrote:
recently, a DBA I know has asked to make a list of candidates to KEEP pool in the buffer cache. He is not familiar with the application. Is there a way to do automated, or is - something that only a person familiar with the business logic can do manually?
I googled a little on the subject, but haven't found much, with the exception of Mr. Burleson scripts (which has a history silly advice so I don't him trust) theoretical or general discussions (like the thread on AskTom). I am interested in someone who has made (or learned why this cannot be done) is sharing his experience.
Basically, I don't thnk that you will be able to get lots of benefits on the application, except if you know demand well enough to say:
This object is large enough, so randomly accessible we continue rinsing of the memory blocks, and if we kept in memory, we would avoid random disk N bed / hour.
Next, you will need to set aside cache much more as there are has blocks in the object (according to the requirements of update and the coherence of reading) and a recycle cache. And you still don't know how much extra I/o other objects would do as a side effect.
You've probably seen the articles that I wrote on the anomalies with Dungeon - here are some links if not:
http://jonathanlewis.WordPress.com/2011/03/14/buffer-States/
http://jonathanlewis.WordPress.com/2010/03/20/not-keeping/
http://jonathanlewis.WordPress.com/2011/03/16/buffer-flush/
http://jonathanlewis.WordPress.com/2011/09/26/upgrade-argh/
Concerning
Jonathan Lewis
http://jonathanlewis.WordPress.com
Author: core Oracle
Tags: Database
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8f953842-815B-4D8C-833d-f2a3dd51e602 wrote:
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If I pin an object in the shared pool, the whole object (all blocks) is in the buffer pool.
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----------------------
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-------------------------------
Please explain a little more.
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See you soon
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