2026-03-12 20:23:15

timhall/monitoring/user_undo_space.sql

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+-- -----------------------------------------------------------------------------------
+-- File Name    : https://oracle-base.com/dba/monitoring/user_undo_space.sql
+-- Author       : Tim Hall
+-- Description  : Displays the undo space currently in use by users.
+-- Requirements : Access to the V$ views.
+-- Call Syntax  : @user_undo_space
+-- Last Modified: 12/02/2004
+-- -----------------------------------------------------------------------------------
+
+COLUMN sid_serial FORMAT A20
+COLUMN username FORMAT A20
+COLUMN program FORMAT A30
+COLUMN undoseg FORMAT A25
+COLUMN undo FORMAT A20
+SET LINESIZE 120
+
+SELECT TO_CHAR(s.sid)||','||TO_CHAR(s.serial#) AS sid_serial,
+       NVL(s.username, '(oracle)') AS username,
+       s.program,
+       r.name undoseg,
+       t.used_ublk * TO_NUMBER(x.value)/1024||'K' AS undo
+FROM   v$rollname    r,
+       v$session     s,
+       v$transaction t,
+       v$parameter   x
+WHERE  s.taddr = t.addr
+AND    r.usn   = t.xidusn(+)
+AND    x.name  = 'db_block_size';