RE: ORA-1555
- From: "Michael Fontana" <MFontana@xxxxxxxxx>
- To: <smishra_97@xxxxxxxxx>, <oracle-l@xxxxxxxxxxxxx>
- Date: Mon, 5 Feb 2007 11:30:09 -0500
Thinking operationally, there are always a myriad number of methods to track
usage and report on UNDO statistics. However, if attempts have been made to
increase these resources, and problems still remain, I have never seen a time
when such issues can be resolved WITHOUT looking into the root causes.
Most of the time, a particular query or combination of queries will be the
issue. Rather than throwing disk resources at the problem, it is usually
necessary to first determine what is running when it occurs, and find the
source or origination of these jobs.
Inevitably, a particular query (or sometimes the same query running
concurrently) will be the cause and will have to be tuned. We have canned
queries which will report on ALL tablespace full conditions which I can supply,
but I really think you need to investigate the cause before heading in that
direction...
Michael Fontana
NTT/Verio
Senior Database Administrator
mfontana@xxxxxxxxx
214.853.7405(Office)
214.912.3705(Wireless)
________________________________
From: oracle-l-bounce@xxxxxxxxxxxxx on behalf of Sanjay Mishra
Sent: Sun 2/4/2007 12:13 AM
To: oracle-l@xxxxxxxxxxxxx
Subject: ORA-1555
Hi everybody
I have seen several time ORA-1555 error in few of the Prod Database. SOme of
them have very big UNDO tablespaces. All are 9i Databases. What are the other
option that need to be checked for such issue beside increasing the space as
some of the database has UNDO tablespace around 50-150G
Is it good to create new undo tablespace and make it default in such scenario
and later on dropped the old. Do somebody has set of UNDO checking query that
can be ran at some particular point to really see if that big UNDO are really
been used so that it can be resized.
I am thankful for any suggestion for monitoring such ORA-1555 as well as query
to check UNDO segment space.
TIA
Sanjay
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