Re: Slow query against ALL_OBJECTS view

Do what?

I think I just stated that analyzing DD could make your DD queries slow.

I wonder whats the situation in next release...

Tanel.

> > One common cause for slow DD queries problem is, that you have analyzed
your
> > data dictionary?
> >
>
> Never ever do that! Read Oracle documentation first! Data dictionary is
> never to be analyzed.
>
> Use hints to force rule-based optimizer.
>
> > Tanel.
> >
> > "Shujda" <nlalovic_at_comcast.net> wrote in message
> > news:D6udndLlqNAsWcyjXTWcoQ_at_comcast.com...
> > > Hello everyone,
> > > I have about 700 users in database and about 300,000 rows in
all_objects
> > > table/view.
> > > More then 90% of the objects in the database are the private synonyms.
The
> > > average user has about 450 private synonyms.
> > > When I logon to database, and execute the query:
> > > SELECT username FROM all_users WHERE EXISTS(SELECT 'X' FROM
all_objects
> > > WHERE owner = username), I get the results within 3-4 seconds. When I
> > logon
> > > as someone else, the same query takes forever to execute (more then 30
> > > minutes). The difference between me and the other user is that I have
> > > connect, resource and dba roles and he has connect and resource only.
When
> > I
> > > grant him dba role, the same query gets executed very fast. When I
revoke
> > > it, it becomes slow again. I know that all_users is a view and that it
> > > returns different recordset depending on who is logged on, but I
didn't
> > know
> > > that it can be such difference in performance...
> > > The biggest problem is that this query gets generated by SQL Navigator
> > when
> > > you click on "Schemas" node, and I can't tune it up.
> > > What is the trick? How can I make it run faster.
> > > Did I hit some limits?
> > > Thanks.
> > > Shujda
> > >
> > >
> > >
> > >
Received on Tue Feb 18 2003 - 16:42:03 CST