Re: Synonyms can be VERY bad for performance

> Because we were in first_rows, queries
> against the data dictionary were
> optimized in first_rows mode rather than rule.
> This was despite us not having any statistics
> on system or sys objects.

Is this standard behavior?

What about the warnings not to analyze SYS because it's optimized for Rule? Is it true that simply invoking first_rows means that's out the window and you get the CBO used on SYS anyway, even if there are no statistics?

I get the feeling we're going to see an email from Anita saying this is bug number XXX, fixed in patch YYY, and we can read all about it in Note ZZZ.

-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Greg Moore
  INET: sqlgreg_at_pacbell.net

Fat City Network Services    -- (858) 538-5051  FAX: (858) 538-5051
San Diego, California        -- Public Internet access / Mailing Lists
--------------------------------------------------------------------
To REMOVE yourself from this mailing list, send an E-Mail message
to: ListGuru_at_fatcity.com (note EXACT spelling of 'ListGuru') and in
the message BODY, include a line containing: UNSUB ORACLE-L
(or the name of mailing list you want to be removed from).  You may
also send the HELP command for other information (like subscribing).