How to assess io performance from os statistics and database statistics?

jinyu wrote:
Anybody have good idea？？One quite useful information that provides a rough indication if there is anything further to investigate regarding I/O performance issues resp. load issues is the V$EVENT_HISTOGRAM view added in 10g.
Interestingly this information is not part of the AWR reports, but shows up in the 10g STATSPACK reports.
For more information, Jonathan Lewis has some interesting notes about it:
http://jonathanlewis.wordpress.com/2007/01/10/event-histograms/
http://jonathanlewis.wordpress.com/2007/01/31/event-histograms-2/
http://jonathanlewis.wordpress.com/2008/06/15/event-snapshots/
It basically allows you to understand if the average wait times that you get from other aggregated statistics are hiding any nasty things that are just waiting to pop up.
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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