RE: Unshared cursors (WAS: Stored outline not being used...)

From: Adrian <ade.turner_at_gmail.com>
Date: Tue, 2 Jan 2007 20:58:28 -0000
Message-ID: <459ac775.09485a92.0efb.559d@mx.google.com>

Rich,

Not been following all of this, but note 261020.1 seems relevant.

Cheers
Adrian

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Jesse, Rich
Sent: 02 January 2007 17:54
To: oracle-l_at_freelists.org
Subject: RE: Unshared cursors (WAS: Stored outline not being used...)

Hi Raj,

In our 10.2.0.2.0 DB, CS is the default of EXACT -- I refuse to use it anymore! However, in 9.2.0.5.0, our DB does have CS=S and there are indeed histograms, but without any problems with cursors being unshared having multiple rows in V$SQL_SHARED_CURSOR with no reasons given (read that carefully).

And since bouncing our 10.2 DB after stopping the nightly flush, I see no problems. Wierd. May be a BUG yet...

Thanks!

Rich

From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Rajesh.Rao_at_jpmchase.com
Sent: Tuesday, January 02, 2007 11:03 AM To: oracle-l_at_freelists.org
Subject: Re: Unshared cursors (WAS: Stored outline not being used...)

Do you have cursor_sharing set? and do you collect histograms on columns?

I have encountered similar bugs on 9.2.0.7 versions, and Oracle support wanted us to generate a reproducible test case, which we could not. We stopped collecting histograms on all columns and have not seen the behaviour since then.

HTH - Raj

"Jesse, Rich" <Rich.Jesse_at_qg.com>
Sent by: oracle-l-bounce_at_freelists.org
01/02/2007 10:48 AM
Please respond to Rich.Jesse

To: <oracle-l_at_freelists.org>
cc:
Subject: Unshared cursors (WAS: Stored outline not being
used...)

Hey all,

I opened an SR on this. While I don't have a repeatable process yet (and therefore no BUG apparently as per a previous thread here), this problem seems to be pointing to flushing the shared pool. The kicker is that I don't think I'll be able to look at this problem any longer other than to put in our SOPs not to flush the shared pool.

Has anyone else seen this in 10gR2, specifically with flushing the shared pool? From past experience and advice, I flush our hybrid production 9.2.0.5.0 nightly with no known side effects.

Rich

From: Jesse, Rich
Sent: Thursday, December 07, 2006 7:40 PM To: oracle-l_at_freelists.org
Subject: RE: Stored outline not being used all the times...

Hi Fairle,

The key word here is "should". I agree, but if you look at my query, you'll see that it's returning multiple rows with all "N"s for the same address.
At least it is for me on 10.2.0.2.0.

My 1 year old kept me up until 2:00 AM last night, so I could be wrong.
I'll try and hammer away at it some more tomorrow.

Thanks!
Rich

From: fairlie rego [mailto:fairlie_r_at_yahoo.com] Sent: Thursday, December 07, 2006 5:48 PM To: binhpham15_at_hotmail.com; Jesse, Rich
Cc: oracle-l_at_freelists.org
Subject: RE: Stored outline not being used all the times...

The row with all 'N' should be the first child as mentioned here All subsequent children should have some mismatch.

-Fairlie

Binh Pham <binhpham15_at_hotmail.com> wrote: I've seen those before, tried to understand why but no clue. Any clue?

From: "Jesse, Rich" <Rich.Jesse_at_qg.com>
Reply-To: Rich.Jesse_at_qg.com
To: <oracle-l_at_freelists.org>
Subject: RE: Stored outline not being used all the times... Date: Thu, 7 Dec 2006 16:22:25 -0600

The real fun begins when rows in there have multiple entries for the same address, but all the columns are "N".

Oh, wait, that's the fun I'm having right now...

Good timing on the thread!

Rich

p.s. I used this quick'n'dirty query in 10.2.0.2.0, which was easy to whip out via Toad:

select *
from
(
SELECT address,
unbound_cursor|| sql_type_mismatch||
[snip]

--
http://www.freelists.org/webpage/oracle-l

Received on Tue Jan 02 2007 - 14:58:28 CST