Cherie,
The only bug I'm aware of on this is a bug I
encountered on 8.1.6 (bug 1161906), but it was fixed
in 8.1.7.0.0, so you shouldn't be encountering it on
8.1.7.1 and AFAIK it did not happen in 7.3.x.
Bug 1161906 resulted in 00-000-00 dates in
last_analyzed when stats were computed on indexes when
stats had not been computed or estimated on the
tables. The obvious workaround was to calculate table
stats before index stats.
HTH,
- Anita
- Cherie_Machler_at_gelco.com wrote:
>
> I just migrated a database from 7.3.4 to 8.1.7.1 on
> Sun Solaris 2.6.
> I do not believe that there were any statistics on
> this database before
> it was migrated.
>
> During the process of the migration, I followed the
> instruction and
> switched optimizer_mode from rule to choose.
>
> After it was upgraded, there were some pockets of
> extremely poor
> performance. On a hunch, I looked at the
> last_analyzed date of
> all my non-system tables. I was surprised to see
> that about a
> third of the tables seemed to have "junk" statistics
> in existence
> with a last_analyzed date of 00-000-00.
>
> What might have caused these statistics to be out
> there? I doubt
> that we had pre-existing statistics because I've had
> them prior
> to upgrades and afterwards they've continued to have
> the same
> valid dates on them as they had before the upgrade.
>
> Anybody seen these "junk" statistics before? I got
> rid of them
> and everything was fine but I'd like to prevent them
> from being
> created the next time that we do a 7.3.4 to 8.1.7.1
> upgrade.
>
> Any light anyone can shed is appreciated.
>
> Thanks,
>
> Cherie
>
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Received on Mon Jun 04 2001 - 06:00:43 CDT
