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Home -> Community -> Mailing Lists -> Oracle-L -> RE: ((Re)): problem interpreting wait events
Ryan,
Try this:
select segment_type, segment_name
from dba_extents
where file_id =3D &file
and &block between block_id and block_id+blocks-1;
It will probably be slow....if so, go w/ the GTT=20 and index solution that Dan already provided.
-Mark
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org]On Behalf Of ryan gaffuri
Sent: Monday, August 23, 2004 4:54 PM
To: oracle-l_at_freelists.org
Subject: ((Re)): problem interpreting wait events
i don't have a problem with performance. I think I am checking the wrong
data dictionray view. I took the p2 value from db file sequential read =
and I
thought I could use the block_id in dba_extents. When I query on it, I =
get
'no rows selected', so I think I am using the wrong view.
anyone know which one to use for this?
----- Original Message -----=20
From: "Daniel Fink" <Daniel.Fink_at_Sun.COM>
To: <oracle-l_at_freelists.org>
Sent: Monday, August 23, 2004 2:57 PM
Subject: Re: problem interpreting wait events
> Ryan,
>
> I have found that this type of query against dba_extents performs
horribly. My solution has been to create a GTT, load relevant data
> from dba_extents, slap an index on file_id and block_id and query the =
GTT.
Even in some of the larger dbs I've done this on, the
> overall time was much less than the original query.
>
-- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html ----------------------------------------------------------------- ---------------------------------------------------------------- Please see the official ORACLE-L FAQ: http://www.orafaq.com ---------------------------------------------------------------- To unsubscribe send email to: oracle-l-request_at_freelists.org put 'unsubscribe' in the subject line. -- Archives are at http://www.freelists.org/archives/oracle-l/ FAQ is at http://www.freelists.org/help/fom-serve/cache/1.html -----------------------------------------------------------------Received on Mon Aug 23 2004 - 15:56:03 CDT
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