RE: db file sequential read - again

Aren't 'physical reads direct' included in 'physical reads'?  If so, I
think you'd want to subtract out that value since direct reads won't be
affected by any pool definition.  Maybe that's not a big deal for most
folks, but with a DW and consequently lots of parallelism, direct reads
are the most frequent physical read, so non-direct physical reads are
important to spot for us.

> The query I came up with is:
>   select vss.owner,
>          vss.object_name,
>          vss.statistic_name,
>          vss.value,
>          ds.bytes segsize,
>          ds.buffer_pool
>     from v$segment_statistics vss,
>          dba_segments ds
>    where vss.statistic_name ='physical reads'
>      and vss.value > 5000000 ---You may need to play with this
threshold
> value for your environment
>      and ds.segment_type = vss.object_type
>      and ds.segment_name = vss.object_name
>      and ds.owner=vss.owner
>      and ds.buffer_pool = 'DEFAULT'
> order by value
> /

Dave

___________________________________

David C. Herring, DBA  |   A c x i o m  Delivery Center Organization

630-944-4762 office | 630-430-5988 wireless | 630-944-4989 fax
*************************************************************************
The information contained in this communication is confidential, is
intended only for the use of the recipient named above, and may be
legally privileged.

If the reader of this message is not the intended recipient, you are 
hereby notified that any dissemination, distribution or copying of this
communication is strictly prohibited.

If you have received this communication in error, please resend this
communication to the sender and delete the original message or any copy
of it from your computer system.

Thank you.
*************************************************************************
--
http://www.freelists.org/webpage/oracle-l

Other related posts: