Knowledge Base : Display Latches

12 Juni 16, 2022 
SELECT s.sid, s.serial#,
 DECODE(s.process, NULL,
 DECODE(SUBSTR(p.username,1,1), '?', UPPER(s.osuser), p.username),
 DECODE( p.username, 'ORACUSR ', UPPER(s.osuser), s.process)
 ) process,
 NVL(s.username, 'SYS ('||substr(p.username,1,4)||')') username,
 DECODE(s.terminal, NULL, RTRIM(p.terminal, CHR(0)),
 UPPER(s.terminal)) terminal,
 DECODE(l.TYPE,
 'TM', 'DML/DATA ENQ', 'TX', 'TRANSAC ENQ',
 'UL', 'PLS USR LOCK',
 'BL', 'BUF HASH TBL', 'CF', 'CONTROL FILE',
 'CI', 'CROSS INST F', 'DF', 'DATA FILE ',
 'CU', 'CURSOR BIND ',
 'DL', 'DIRECT LOAD ', 'DM', 'MOUNT/STRTUP',
 'DR', 'RECO LOCK ', 'DX', 'DISTRIB TRAN',
 'FS', 'FILE SET ', 'IN', 'INSTANCE NUM',
 'FI', 'SGA OPN FILE',
 'IR', 'INSTCE RECVR', 'IS', 'GET STATE ',
 'IV', 'LIBCACHE INV', 'KK', 'LOG SW KICK ',
 'LS', 'LOG SWITCH ',
 'MM', 'MOUNT DEF ', 'MR', 'MEDIA RECVRY',
 'PF', 'PWFILE ENQ ', 'PR', 'PROCESS STRT',
 'RT', 'REDO THREAD ', 'SC', 'SCN ENQ ',
 'RW', 'ROW WAIT ',
 'SM', 'SMON LOCK ', 'SN', 'SEQNO INSTCE',
 'SQ', 'SEQNO ENQ ', 'ST', 'SPACE TRANSC',
 'SV', 'SEQNO VALUE ', 'TA', 'GENERIC ENQ ',
 'TD', 'DLL ENQ ', 'TE', 'EXTEND SEG ',
 'TS', 'TEMP SEGMENT', 'TT', 'TEMP TABLE ',
 'UN', 'USER NAME ', 'WL', 'WRITE REDO ',
 'TYPE='||l.TYPE) TYPE,
 DECODE(l.lmode, 0, 'NONE', 1, 'NULL', 2, 'RS', 3, 'RX',
 4, 'S', 5, 'RSX', 6, 'X',
 TO_CHAR(l.lmode) ) lmode,
 DECODE(l.request, 0, 'NONE', 1, 'NULL', 2, 'RS', 3, 'RX',
 4, 'S', 5, 'RSX', 6, 'X',
 TO_CHAR(l.request) ) lrequest,
 DECODE(l.TYPE, 'MR', DECODE(u.name, NULL,
 'DICTIONARY OBJECT', u.name||'.'||o.name),
 'TD', u.name||'.'||o.name,
 'TM', u.name||'.'||o.name,
 'RW', 'FILE#='||substr(l.id1,1,3)||
 ' BLOCK#='||substr(l.id1,4,5)||' ROW='||l.id2,
 'TX', 'RS+SLOT#'||l.id1||' WRP#'||l.id2,
 'WL', 'REDO LOG FILE#='||l.id1,
 'RT', 'THREAD='||l.id1,
 'TS', DECODE(l.id2, 0, 'ENQUEUE',
 'NEW BLOCK ALLOCATION'),
 'ID1='||l.id1||' ID2='||l.id2) object
 FROM sys.v_$lock l, sys.v_$session s, sys.obj$ o, sys.USER$ u,
 sys.v_$process p
 WHERE s.paddr = p.addr

AND l.sid = s.sid

 AND l.id1 = o.obj#

AND o.owner# = u.USER#
AND l.TYPE <> ‘MR’

 UNION ALL 
 SELECT s.sid, s.serial#, s.process, s.username, s.terminal,
 'LATCH', 'X', 'NONE', h.name||' ADDR='||rawtohex(laddr)
 FROM sys.v_$process p, sys.v_$session s, sys.v_$latchholder h
 WHERE h.pid = p.pid
 AND p.addr = s.paddr
 UNION ALL 
 SELECT s.sid, s.serial#, s.process, s.username, s.terminal,
 'LATCH', 'NONE', 'X', name||' LATCH='||p.latchwait
 FROM sys.v_$session s, sys.v_$process p, sys.v_$latch l
 WHERE latchwait IS NOT NULL
 AND p.addr = s.paddr
 AND p.latchwait = l.addr;