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 Mon Feb 17 2003 - 23:18:05 CST
