Surprising event

From: Csillag Zsolt <starsoft_at_interware.hu>
Date: Wed, 12 Sep 2001 15:45:51 -0700
Message-ID: <F001.0038C7AB.20010912160316@fatcity.com>

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

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Author: Csillag Zsolt
  INET: starsoft_at_interware.hu

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