Re: grant select command so slow

From: John Kanagaraj <>
Date: Thu, 15 May 2008 12:39:19 -0700
Message-ID: <>


> I have created a role with just select privilege on all sysadm objects. The
> script run very fast at first time. Since there maybe new tables created in
> the prod. So I cron the script, run it every night. Now the script ran so
> slow, each grant statement at least took 2 to 3 seconds. So it never
> finished to run in one day. (totally had more than 49000 tables and views).
> The system is not loaded, most time is just this session is active. The
> other function seems normal, users didn't complain for their activities. Do
> you know any reason why the "grant select on syadm.xxxx to role" run so
> slow?

I had exactly this situation a while ago. It turned out to be Shared pool issue - Latching in the shared pool and library cache, and a steep spike in parsing. You might want to check STATSPACK or AWR (if 10g) during that period. In my case, the previous DBA had written a SQL script to generate GRANT statements on *ALL* objects, and I rewrote this to GRANT only on *New* objects, and this problem went away..

What was happening is this: From a DB shared pool perspective, these thousands of GRANT statements were non-bind SQLs and each needed to be parsed. This flood of non-bind SQL shredded the shared pool and the DB went crazy trying to juggle free space in the shared pool (latching, etc).

At the risk of violating my BAAG agreement, I suspect this is also happening in your DB as well (Alex G: Please excuse my trespass :)

John Kanagaraj <><
DB Soft Inc (Sorry - not an Oracle blog!)
** The opinions and facts contained in this message are entirely mine
and do not reflect those of my employer or customers **
Received on Thu May 15 2008 - 14:39:19 CDT

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