Srinivas:

How about this:

select sid
     , serial#
  from sys.v_$session
 where (sysdate-logon_time) <= (30/(24*60));

This will give you a list of all the sessions that have been connected for 30 minutes 
or less.

HTH

Jon Walthour

> 
> From: "Tatireddy, Shrinivas (MED, Keane)" <[EMAIL PROTECTED]>
> Date: 2001/08/08 Wed AM 09:15:26 EDT
> To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
> Subject: avoid duplicate sql
> 
> Hi lists
> 
> i need help in writing a sql query:
> 
> i am trying to capture the session information from v$session and
> inserting the same into someother table xyz with columns username,
> logon_time. (scott logged in at 10:30 hrs)
> 
> i put this script in cron. it runs every 30 minutes. but i need the
> values shoudld not be duplicated.
> 
> Every time the shell script runs, it inserts values into XYZ. table.
> Here i need your help. The values should not be duplicated that are
> being insreted into xyz.
> 
> since username,logon_time are composite primary key, system will not
> accept duplicates.
> 
> Because, in the v$session, if the user stays more than 30 minutes, his
> values will be sent to xyz table and as already xyz has that row
> (inserted before 30 minutes by shell), system will deny to insert the
> duplicate the value into xyz.
> 
> any scripts? scripts? 
> 
> thanx in advance
> srinivas
> -- 
> Please see the official ORACLE-L FAQ: http://www.orafaq.com
> -- 
> Author: Tatireddy, Shrinivas (MED, Keane)
>   INET: [EMAIL PROTECTED]
> 
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-- 
Please see the official ORACLE-L FAQ: http://www.orafaq.com
-- 
Author: Jon Walthour
  INET: [EMAIL PROTECTED]

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