Re: Same Query, same database, same application, new plan from one environment but not from another

Well 2 weeks ago is supiciously close to Patch Tuesday when updates for MS products including Access were released. - There isn't anything about the specific patch that would immediately seem to match ( http://www.microsoft.com/technet/security/bulletin/ms08-041.mspx) but still it would seem a bit coincidental, especially if the patch were rolled up with say a service pack to office.

Niall

On Wed, Aug 27, 2008 at 10:54 PM, Rumpi Gravenstein <rgravens_at_gmail.com>wrote:

> First here's what I'm running on:
>
> Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - 64bit
> PL/SQL Release 10.2.0.3.0 - Production
> CORE 10.2.0.3.0 Production
> TNS for Linux IA64: Version 10.2.0.3.0 - Production
> NLSRTL Version 10.2.0.3.0 - Production
>
> About a week or two ago a user started to complain that his Access 2002
> Oracle queries started slowing down, not by a little, but by a lot.
> Something that used to take a few minutes was now running into the hours.
> In this first case, the query has just one bind variable, a date, all the
> other predicate conditions are column joins or literals.
>
> So we ran a trace on it and got that the Access query was suddenly using a
> very bad explain plan.
>
>
>
> Everyone claims that nothing has changed but clearly something has as the
> Access run of the query now always runs slow and a cut and paste of the same
> query through Toad always runs fast.
>
>
>
> Also interesting, is that other users of Access databases that go against
> different tables have started to report slow-downs as well, but
> interestingly not all at the same time. I checked and am told that there
> have been no updates that should affect the Access 2002 to Oracle connection
> environment in the last few weeks. Having said that, about 1.5 months ago
> there was a migration to the 10g client.
>
>
>
> I'm going to run a 10053 trace against the Access version of the query to
> see if that sheds any light on the issue.
>
>
>
> In the mean time I thought I'd post here to see if anyone else has seen
> something like this.
>
>
>
> --
> Rumpi Gravenstein
>

-- 
Niall Litchfield
Oracle DBA
http://www.orawin.info

--
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