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  • Script to find who is using UNDO space in Oracle

    The script will list the users who are using the UNDO space and how many block they are using.

    SELECT a.sid, a.username, b.used_urec, b.used_ublk
      FROM v$session a, v$transaction b
     WHERE a.saddr = b.ses_addr
     ORDER BY b.used_ublk DESC;


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