2026-03-12 20:23:15
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vg/latchprofx.sql
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vg/latchprofx.sql
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--
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-- File name: latchprofx.sql ( Latch Holder Profiler eXtended )
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-- Purpose: Perform high-frequency sampling on V$LATCHHOLDER
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-- and present a profile of latches held by sessions
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-- including extended statistics about in which kernel
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-- function the latch held was taken
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--
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-- Author: Tanel Poder
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-- Copyright: (c) http://www.tanelpoder.com
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--
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-- Usage: @latchprofx <what> <sid> <latch name> <#samples>
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-- @latchprofx name 350 % 100000 - monitor all latches SID 350 is holding
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-- @latchprofx sid,name % library 1000000 - monitor which SIDs hold latches with "library" in their name
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-- @latchprofx sid,name,laddr % 40D993A0 100000 - monitor which SIDs hold child latch with address 0x40D993A0
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-- @latchprofx sid,name,func % % 100000
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-- - monitor all sessions and latches and show
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-- - latch get Where info (locations in kernel code
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-- - where the latch get was done)
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--
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-- @latchprofx sid,name,hmode,func 89 "cache buffers chains" 100000
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-- - monitor functions that took latch for SID 89 only
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-- - and report only "cache buffers chains" latch holders
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-- - also report hold mode HMODE (shared or exclusive)
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--
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-- @latchprofx sid,name,hmode,func,object % 40D993A0 100000
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-- - monitor for what object's access the child latch at
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-- - particular address was taken. for cache buffers chains
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-- - latch the object means data block address (DBA)
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-- - of the block accessed in buffer cache.
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-- - you can translate the 6-byte DBA to rfile#/block#
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-- - using dbms_utility or dba.sql script from TPT scripts
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--
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-- Other:
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-- This script is based on X$ tables instead of V$ tables
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-- as some info required is not externalized to V$.
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-- So you need to run this script either as SYS or
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-- need to have relevant X$ proxy views created
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--
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-- The sampling relies on NESTED LOOP join method and having
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-- X$KSUPRLAT as the inner (probed) table.
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--
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-- If sampling always reports a single latch event even though
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-- many different events (or parameter values) are expected then
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-- the execution plan used is not right.
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--
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-- The join in exec plan step 9 MUST be a NESTED LOOPS join, this is how
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-- the high speed sampling is done.
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--
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-- -----------------------------------------------------------------------------------------------------
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-- | Id | Operation | Name | E-Rows | OMem | 1Mem | Used-Mem |
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-- -----------------------------------------------------------------------------------------------------
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-- | 1 | MERGE JOIN CARTESIAN | | 1 | | | |
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-- | 2 | MERGE JOIN CARTESIAN | | 1 | | | |
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-- |* 3 | FIXED TABLE FULL | X$KSUTM | 1 | | | |
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-- | 4 | BUFFER SORT | | 1 | 9216 | 9216 | 8192 (0)|
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-- | 5 | VIEW | | 1 | | | |
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-- | 6 | SORT ORDER BY | | 1 | 2048 | 2048 | 2048 (0)|
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-- | 7 | HASH GROUP BY | | 1 | | | |
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-- | 8 | NESTED LOOPS OUTER | | 1 | | | |
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-- | 9 | NESTED LOOPS | | 1 | | | |
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-- | 10 | VIEW | | 1 | | | |
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-- | 11 | CONNECT BY WITHOUT FILTERING| | | | | |
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-- | 12 | FAST DUAL | | 1 | | | |
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-- |* 13 | FIXED TABLE FULL | X$KSUPRLAT | 1 | | | |
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-- |* 14 | FIXED TABLE FIXED INDEX | X$KSLLW (ind:2) | 1 | | | |
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-- | 15 | BUFFER SORT | | 1 | 9216 | 9216 | 8192 (0)|
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-- |* 16 | FIXED TABLE FULL | X$KSUTM | 1 | | | |
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-- -----------------------------------------------------------------------------------------------------
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--
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-- If you want to drill down to latch child level, include "name" in first parameter to latchprof
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--
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-- Then you can use la.sql (V$LATCH_PARENT/V$LATCH_CHILDREN) to
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-- map the latch address back to latch child#
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--
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--------------------------------------------------------------------------------
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-- what includes what columns to display & aggregate and also options like latch name filtering
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DEF _lhp_what="&&1"
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DEF _lhp_sid="&2"
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DEF _lhp_name="&3"
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DEF _lhp_samples="&4"
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COL name FOR A35 TRUNCATE
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COL latchprof_total_ms HEAD "Held ms" FOR 999999.999
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COL latchprof_pct_total_samples head "Held %" format 999.99
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COL latchprof_avg_ms HEAD "Avg hold ms" FOR 999999.999
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COL dist_samples HEAD Gets
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COL total_samples HEAD Held
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COL ksllwnam FOR A40 TRUNCATE
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COL ksllwlbl FOR A20 TRUNCATE
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COL objtype FOR A20 TRUNCATE
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COL object FOR A17 WRAP JUST RIGHT
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COL hmode FOR A12 TRUNCATE
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COL what FOR A17 WRAP
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COL func FOR A40 TRUNCATE
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BREAK ON lhp_name SKIP 1
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DEF _IF_ORA_10_OR_HIGHER="--"
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PROMPT
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PROMPT -- LatchProfX 2.00 by Tanel Poder ( http://www.tanelpoder.com )
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COL latchprof_oraversion PRINT NEW_VALUE _IF_ORA_10_OR_HIGHER
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SET TERMOUT OFF
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SELECT DECODE(SUBSTR(BANNER, INSTR(BANNER, 'Release ')+8,1), 1, '', '--') latchprof_oraversion
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FROM v$version WHERE ROWNUM=1;
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SET TERMOUT ON
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WITH
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t1 AS (SELECT hsecs FROM v$timer),
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samples AS (
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SELECT /*+ ORDERED USE_NL(l.x$ksuprlat) USE_NL(s.x$ksuse) NO_TRANSFORM_DISTINCT_AGG */
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&_lhp_what
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&_IF_ORA_10_OR_HIGHER , COUNT(DISTINCT gets) dist_samples
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, COUNT(*) total_samples
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, COUNT(*) / &_lhp_samples total_samples_pct
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FROM
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(SELECT /*+ NO_MERGE */ 1 FROM DUAL CONNECT BY LEVEL <= &_lhp_samples) s,
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(SELECT ksuprpid PID, ksuprsid SID, ksuprlnm NAME, ksuprlat LADDR, ksulawhr,
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TO_CHAR(ksulawhy,'XXXXXXXXXXXXXXXX') object
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&_IF_ORA_10_OR_HIGHER , ksulagts GETS, lower(ksuprlmd) HMODE
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FROM x$ksuprlat) l,
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(SELECT
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indx
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, ksusesqh sqlhash
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, ksusesql sqladdr
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&_IF_ORA_10_OR_HIGHER , ksusesph planhash
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&_IF_ORA_10_OR_HIGHER , ksusesch sqlchild
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&_IF_ORA_10_OR_HIGHER , ksusesqi sqlid
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FROM x$ksuse) s,
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(SELECT indx,
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ksllwnam func, ksllwnam,
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ksllwlbl objtype, ksllwlbl
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FROM x$ksllw) w
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WHERE
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l.sid LIKE '&_lhp_sid'
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AND l.ksulawhr = w.indx (+)
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AND l.sid = s.indx
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AND (LOWER(l.name) LIKE LOWER('%&_lhp_name%') OR LOWER(RAWTOHEX(l.laddr)) LIKE LOWER('%&_lhp_name%'))
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GROUP BY
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&_lhp_what
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ORDER BY
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total_samples DESC
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),
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t2 AS (SELECT hsecs FROM v$timer)
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SELECT /*+ ORDERED */
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&_lhp_what
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, s.total_samples
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&_IF_ORA_10_OR_HIGHER , s.dist_samples
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-- , s.total_samples_pct
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, s.total_samples / &_lhp_samples * 100 latchprof_pct_total_samples
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, (t2.hsecs - t1.hsecs) * 10 * s.total_samples / &_lhp_samples latchprof_total_ms
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-- , s.dist_events
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&_IF_ORA_10_OR_HIGHER , (t2.hsecs - t1.hsecs) * 10 * s.total_samples / dist_samples / &_lhp_samples latchprof_avg_ms
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FROM
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t1,
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samples s,
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t2
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WHERE ROWNUM <= 20
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/
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COL name CLEAR
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COL hmode CLEAR
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COL what CLEAR
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COL func CLEAR
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COL objtype CLEAR
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