((Re)): problem interpreting wait events
- From: "ryan gaffuri" <ryan.gaffuri@xxxxxxxxxxx>
- To: <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 23 Aug 2004 16:53:45 -0400
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 -----
From: "Daniel Fink" <Daniel.Fink@xxxxxxx>
To: <oracle-l@xxxxxxxxxxxxx>
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.
>
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