Re[2]: Surprising event

From: <dgoulet_at_vicr.com>
Date: Thu, 13 Sep 2001 06:44:13 -0700
Message-ID: <F001.0038D15C.20010913062027@fatcity.com>

!! Please do not post Off Topic to this List !!

Connor,

    For the most part I agree, but I have also seen circumstances where a function (in my case) works very consistently for months and then goes totally south right out of the clear blue. This gets especially nerve racking when there are no indications of what the heck has happen, like no locks evident, no alert log messages, the function is still valid, etc.... I'll finally get everyone using the function to stop for a couple of moments, recompile it with no errors, and it returns back to normal. It's just like the DB makes a odd decision to do something crazy.

Dick Goulet

____________________Reply Separator____________________
Author: =?iso-8859-1?q?Connor=20McDonald?= <hamcdc_at_yahoo.co.uk>
Date:       9/13/2001 3:10 AM

!! Please do not post Off Topic to this List !!Are you regularly performing the appropriate analysis
of optimiser stats?

Its not too uncommon for performance to suddenly go "over the edge" rather than degrade in the nice linear fashion. For example, sorts suddenly needing to go to disk - "just" not fitting into memory etc

hth
connor

• Csillag Zsolt <starsoft_at_interware.hu> wrote: >
  >
  > Hi,
  >
  > We have a cgi that displays data from oracle tables.
  > The program has been running for several months
  > perfectly.
  >
  > Last week every time it started, it seemed to almost
  > "freeze" the Oracle
  > server ,
  > it didn' t end the operation (many Select
  > statements).
  >
  > After several hours of work we removed the /*+
  > FIRST_ROWS */ hints from some of
  > the selects and the problem went down to 50% ( It
  > woult be a long story to
  > tell all the details).
  >
  > At last we recreated _all_ the indexes and the
  > problem dissapeared,
  > everything was fine again.
  >
  > Question: Should a "bad" index cause a problem like
  > this and why?
  > If an index is "bad" how come Oracle doesn' t see
  > it?
  >
  > It is important for me to know that for I don' t
  > want to run in this
  > problem again.
  >
  > Thank you
  >
  >
  > Zsolt Csillag
  > Hungary
  >
  > --
  > Please see the official ORACLE-L FAQ:
  > http://www.orafaq.com
  > --
  > Author: Csillag Zsolt
  > INET: starsoft_at_interware.hu
  >
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Connor McDonald
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Received on Thu Sep 13 2001 - 08:44:13 CDT