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AWR report [message #539571]

Tue, 17 January 2012 03:52

sandeip
Messages: 23
Registered: May 2011
Location: pune

Junior Member

Hi,

we have OS detail: Microsoft Windows Server 2003
Standard Edition
Service Pack 2

Database version : 11.2.0.1.0

I have generated AWR report of my database,but it don't show anything other than phy and logical read (i.e. buffer cache,shared pool size,Buffer Hit%, Library Hit%. i m using Automatic Memory Management Feature.I want to calculate Hit Ratio

Please help me for same.

Attachment: awrrpt_17012011.txt
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Re: AWR report [message #539575 is a reply to message #539571]

Tue, 17 January 2012 04:06

Michel Cadot
Messages: 68641
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

1) so you have no problem
2) why do you want some meaningless ratio
3) Your report shows you did nothing on the database

Regards
Michel

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Re: AWR report [message #539582 is a reply to message #539575]

Tue, 17 January 2012 04:42

sandeip
Messages: 23
Registered: May 2011
Location: pune

Junior Member

Hi Michel,

Thanks for your reply,
I got it this is because i have set control_management_pack_access to "NONE". so its shows nothing.

As DB Block Buffer Cache Hit Ratio is 62.85%. So want to increase DB_BLOCK_BUFFERS parameter to bring value above 89%

How should i do it in oracle 11.2.0.1.0?

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Re: AWR report [message #539583 is a reply to message #539582]

Tue, 17 January 2012 04:47

Michel Cadot
Messages: 68641
Registered: March 2007
Location: Nanterre, France, http://...

Senior Member
Account Moderator

It is useless, meaningless and irrelevant to try to tune something with global hit ratios.
Forget it!

Regards
Michel

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Re: AWR report [message #539614 is a reply to message #539583]

Tue, 17 January 2012 06:40

sandeip
Messages: 23
Registered: May 2011
Location: pune

Junior Member

As one of our global DBA run following query

SELECT (1 - (phys.value / (db.value + cons.value))) * 100
FROM v$sysstat phys,
v$sysstat db,
v$sysstat cons
WHERE phys.name = 'physical reads'
AND db.name = 'db block gets'
AND cons.name = 'consistent gets';

and found that DB Block Buffer Cache Hit Ratio is 62.85%.

So he suggested to increase DB_BLOCK_BUFFERS parameter to bring value above 89%. As we have 11.2.0.1.0 database so he suggested to increase MEMORY TARGET by 20%,currently we are having 800M

Please help me for same,whether i'll increase the memory_target, as we are having increased value of parameter last time.

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