2026-03-12 20:23:15

vdh/latchfree.sql

@@ -0,0 +1,49 @@
+/********************************************************************
+ * File:        latchfree.sql
+ * Type:        SQL*Plus script
+ * Author:      Tim Gorman (Evergreen Database Technologies, Inc.)
+ * Date:        01-Dec-99
+ *
+ * Description:
+ *      Script to display more session-level and SQL-level information
+ *	about sessions waiting on a "latch free" wait event.
+ *
+ * Modification:
+ *
+ ********************************************************************/
+set echo off feedback off timing off pause off
+set pages 100 lines 500 trimspool on trimout on space 1 recsep each
+
+col sid format 990
+col program format a15 word_wrap
+col latch format a10 word_wrap
+col process format a8 word_wrap heading "Clnt|PID"
+col ospid format 9999990 heading "Srvr|PID"
+col sql_text format a30 word_wrap
+col instance new_value V_INSTANCE noprint
+select	lower(replace(t.instance,chr(0),'')) instance
+from	sys.v_$thread        t,
+	sys.v_$parameter     p
+where	p.name = 'thread'
+and	t.thread# = to_number(decode(p.value,'0','1',p.value));
+
+select	w.sid,
+	c.name || ' (child #' || c.child# || ')' latch,
+	s.program,
+	s.machine || ', ' || s.process process,
+	p.spid ospid,
+	a.sql_text
+from	v$session_wait		w,
+	v$latch_children	c,
+	v$session		s,
+	v$process		p,
+	v$sqlarea		a
+where	w.event = 'latch free'
+and	c.addr = w.p1raw
+and	s.sid = w.sid
+and	p.addr = s.paddr
+and	a.address (+) = s.sql_address
+
+spool latchfree_&&V_INSTANCE
+/
+spool off