Oracle-L: RE: Stored procedure memory problem

From: Fink, Dan <Dan.Fink_at_mdx.com>
Date: Wed, 18 Dec 2002 07:19:35 -0800
Message-ID: <F001.0051CC9F.20021218071935@fatcity.com>

Venu,

Another issue to be concerned about is the possibility of encountering an ORA-1555 error. This error may be triggered by a condition called 'Fetch Across Commits'. The cursor must maintain read consistency while it is open. If you are updating the source data and the undo entries are overwritten (assuming you commit periodically), then a read consistent version cannot be created. There are two docs/presentations to review. The first is 'Cats Dogs and ORA-01555' which is available at www.evdbt.com/papers.htm. The other is 'UNDO Internals' at www.optimaldba.com/library.html.

Dan Fink

-----Original Message-----
Sent: Tuesday, December 17, 2002 8:54 PM To: Multiple recipients of list ORACLE-L

A small question to all gurus on the list...

I have a stored procedure (SP) which runs at specific intervals. It fetches a list of user names and few (2 columns) of their details into a cursor and processes them one by one in a cursor FOR loop.

Now my question is, Is there a chance of the SP running out of memory when the number of users increases (may be a few hundreds of thousands). If yes how to estimate the maximum number of user names my cursor can handle? Is there any calculation for this? How to overcome this problem? Is there anything else that has to be taken into account when doing this?

Thanks in advance!
Venu G.
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Author: Fink, Dan
INET: Dan.Fink_at_mdx.com

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