Comments on: Ideas For Oracle Performance Topics http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/?utm_source=rss&utm_medium=rss&utm_campaign=ideas-for-oracle-performance-topics Data, Databases, Performance & Scalability Sun, 13 May 2012 01:52:50 -0400 hourly 1 http://wordpress.org/?v=3.3.2 By: whiz http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-11096 whiz Mon, 01 Mar 2010 22:11:26 +0000 http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-11096 <a href="#comment-49" rel="nofollow">@Krishna</a> Please Krishna, That was an absolute statement. Perhaps "The DBA's I come across lack ....." By saying in the manner you have, its unfair. Consider this ....do you know that speeds of HDD matter a lot in latency and I/O. If you do then good. However in the end what really matters is the absolute result. Please allow me to give you an example. Consider a 15K rpm HDD. Now its obvious a 20K rpm would be faster. But then is it ? Please do the maths and you shall agree to the below. In order to shave off latency of just 1ms off a 15K rpm drive, the drive has to run at speed of 30K rpm. That's twice for a measly 1ms. And the technology is not advanced enough for that drive speed. Absolute results matter. if 15K gives me what I want then 20K is really not up to it. The time taken for a job or query is the best unit of judgement. Basically I am trying so say : A Performance Tuning DBA is knowledgeable of all aspects of the domain. I would not generalise an absolute comment. Thanks, W. @Krishna
Please Krishna,

That was an absolute statement. Perhaps “The DBA’s I come across lack …..”
By saying in the manner you have, its unfair.

Consider this ….do you know that speeds of HDD matter a lot in latency and I/O.
If you do then good. However in the end what really matters is the absolute result.
Please allow me to give you an example.

Consider a 15K rpm HDD.
Now its obvious a 20K rpm would be faster. But then is it ?
Please do the maths and you shall agree to the below.
In order to shave off latency of just 1ms off a 15K rpm drive, the drive has to run at speed of 30K rpm. That’s twice for a measly 1ms.
And the technology is not advanced enough for that drive speed.

Absolute results matter. if 15K gives me what I want then 20K is really not up to it.
The time taken for a job or query is the best unit of judgement.

Basically I am trying so say :
A Performance Tuning DBA is knowledgeable of all aspects of the domain.
I would not generalise an absolute comment.

Thanks,
W.

]]> By: smallkoala http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-50 smallkoala Mon, 11 Feb 2008 04:55:38 +0000 http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-50 We know awr report is important for us to identify performance issues.But the report has a lot of context and not easy to understand.Could you post some typical tips about reading awr report? Thanks. We know awr report is important for us to identify performance issues.But the report has a lot of context and not easy to understand.Could you post some typical tips about reading awr report? Thanks.

]]> By: Krishna http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-49 Krishna Wed, 28 Nov 2007 04:04:11 +0000 http://structureddata.org/2007/10/26/ideas-for-oracle-performance-topics/#comment-49 Hi Greg, I have often noticed that dba's are not very knowledgeable when it comes to viewing system/storage stats to identify performance bottlenecks with respect to their database. In that context, can you post on a few simple and quick checks to identify if one is facing a performance issue ? This would be something which an Oracle DBA with non-privileged access can execute and draw conclusions - either through the database or system commands (Unix/Linux). Thanks Krishna Hi Greg,

I have often noticed that dba’s are not very knowledgeable when it comes to viewing system/storage stats to identify performance bottlenecks with respect to their database.

In that context, can you post on a few simple and quick checks to identify if one is facing a performance issue ? This would be something which an Oracle DBA with non-privileged access can execute and draw conclusions – either through the database or system commands (Unix/Linux).

Thanks
Krishna

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