2026-03-12 20:23:15

vdh/show_active_undo.sql

@@ -0,0 +1,31 @@
+-- show per active transaction the size of the undo and some session information
+-- more session information can be retrieved by sessinfo2.sql
+
+set linesize 250
+set pages 50000
+
+column username format a30
+column osuser format a30
+column machine format a30
+column program format a50
+column used_undo_mb format 9G999G999D99
+column start_date_str format a14
+
+select
+  ses.inst_id,
+  ses.sid,
+  ses.serial#,
+  ses.username,
+  ses.osuser,
+  ses.machine,
+  ses.program,
+  to_char(tra.start_date, 'DD/MM HH24:MI:SS') as start_date_str,
+  tra.used_ublk * 8 / 1024 as used_undo_mb,
+  tra.status
+from
+  gv$session ses
+    join gv$transaction tra
+      on ( ses.inst_id = tra.inst_id
+           and ses.taddr = tra.addr
+         )
+;