Oracle-L: Re: Users reading from rollback segments

From: <Rajesh.Rao_at_jpmchase.com>
Date: Tue, 26 Feb 2002 12:08:44 -0800
Message-ID: <F001.00418FE1.20020226120844@fatcity.com>

To partially answer your question, xacts in v$rollstat will tell you if there are any active transactions in the rollback segment.

Raj

                                                                                                                    
                    Glenn Travis                                                                                    
                    <Glenn.Travis        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>        
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                    Sent by:             Subject:     Users reading from rollback segments                          
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                    February 26,                                                                                    
                    2002 02:38 PM                                                                                   
                    Please                                                                                          
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                    ORACLE-L

Is there a way to tell if anyone is reading from the rollback segments?

I would like to manually issue 'alter rollback segment XXX shrink;', but do not want to do so if there are users reading read consistent data from the rollback space (thus giving them the ORA-01555 error).

Is there a way to check if the rollback segment is in use first?

Can I try to take it offline? Will it fail if there is someone reading from it?

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Author: 
  INET: Rajesh.Rao_at_jpmchase.com

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Received on Tue Feb 26 2002 - 14:08:44 CST