RE: ((Re)): problem interpreting wait events

  • From: "Bobak, Mark" <Mark.Bobak@xxxxxxxxxxxxxxx>
  • To: <oracle-l@xxxxxxxxxxxxx>
  • Date: Mon, 23 Aug 2004 17:00:08 -0400

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@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of ryan gaffuri
Sent: Monday, August 23, 2004 4:54 PM
To: oracle-l@xxxxxxxxxxxxx
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@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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