Robin,
Thanks for the reply. I figured it would. Thats what
we are working at now. It's unfortunate it was set up
this way to begin with, but I am starting to see the
light at the end of the tunnel.
Larry
- Robin Li <rli_at_nyp.org> wrote:
> I had the performance issue with CLOB in one of my
> databases. After I did a
> re-org, and separated the tables,indexes and CLOB
> into different
> tablespaces, the performance got tremendous
> improvement.
>
> Robin
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L"
> <ORACLE-L_at_fatcity.com>
> Sent: Friday, October 31, 2003 9:59 AM
>
>
> > After deleting lot of old data, an analyze of the
> table is in order though
> ..
> >
> > Raj
> >
>
> ------
> > Rajendra dot Jamadagni at nospamespn dot com
> > All Views expressed in this email are strictly
> personal.
> > QOTD: Any clod can have facts, having an opinion
> is an art !
> >
> >
> > -----Original Message-----
> > Sent: Friday, October 31, 2003 9:50 AM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > Good Morning,
> >
> > I have a database (8.1.7.3 on Sun Solaris 8) that
> has
> > a mixture of tables and indexes in the same
> > tablespace. Poor initial setup, but that is
> starting
> > to be addressed. One of the tables has a BLOB data
> > type and the LOBSEGMENT is stored in the same
> > tablespace as the tables and indexes. The size of
> the
> > tablespace is about 45G. The table with the BLOB
> had
> > about 3 million rows in it before we started to
> purge
> > old data out. After we were done purging I wanted
> to
> > see how many rows were left. I did what I though
> was a
> > harmless SELECT COUNT(*) on the table, and I had
> to
> > kill it after 3 hours without anything getting
> > returned. Before the purge, it would return in
> 10-15
> > minutes. In addition, our client base slowed to a
> > crawl. But not because my query was running away.
> > Memory, cpu and i/o on the server were very low.
> It
> > was almost like only a few sessions at a time were
> > getting to the server. My query maxed out at about
> 3%
> > of the cpu.
> >
> > Using performance monitor didn't show any massive
> > usage from the database side either. It was almost
> > like the query was just chugging away under the
> radar,
> > but preventing others from doing barely any work.
> As
> > soon as I killed this query, the system went back
> to
> > normal.
> >
> > We have been experiencing intermittent slowness
> for
> > awhile during normal processing, but have never
> been
> > able to find the silver bullet reason that was
> > dragging everyone down. I am wondering if I have
> > stumbled onto something here. It could be that
> > whatever slowed my query is having the same affect
> > anytime a client is doing anything with the table
> with
> > the BLOB data type. Could anyone tell me why this
> > SELECT could have taken so long and had such an
> effect
> > on the clients?
> >
> > Thanks in advance for any assistance
> >
> > Larry
> >
> >
> >
> > =====
> >
> >
> > __________________________________
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> > Author: Jamadagni, Rajendra
> > INET: Rajendra.Jamadagni_at_espn.com
> >
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> --
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> Author: Robin Li
> INET: rli_at_nyp.org
>
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--
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Received on Fri Oct 31 2003 - 10:29:26 CST
