ORACLE 락 정보
DB CAFE
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- DBA { Oracle DBA 명령어 > DBA 초급 과정 > DBA 고급 과정 }
- 튜닝 { 오라클 튜닝 목록 }
- 모델링 { 데이터 모델링 가이드 }
목차
1 LOCK 걸린 개체 확인 및 LOCK 해제[편집]
1.1 lock 걸린 개체 확인[편집]
SELECT /*+ ordered */
LEVEL
lvl,
NVL (s.blocking_session, s.sid)
lck_hold,
CASE WHEN s.blocking_session IS NOT NULL THEN s.sid END
lck_wait,
s.username,
s.osuser,
s.status,
l.TYPE
TYPE,
fn_sec_to_time (l.ctime)
lock_tm,
DECODE (lmode,
0, 'NONE',
1, 'NULL',
2, 'row-S(SS)',
3, 'row-X(SX)',
4, 'share(S)',
5, 'S/Row-X(SSX)',
6, 'exclusive(X)')
HOLD,
o.name
object --, decode(l.id2, 0, null, trunc(l.id1 / power(2,16))) undo#
--, decode(l.id2, 0, null, bitand(l.id1, to_number('ffff', 'xxxx')) + 0 ) slot#
,
l.id1,
l.id2,
DECODE (l.request,
0, 'NONE',
1, 'NULL',
2, 'row-S(SS)',
3, 'row-X(SX)',
4, 'share(S)',
5, 'S/Row-X(SSX)',
6, 'exclusive(X)')
REQUEST,
s.event,
s.machine,
s.module,
s.program,
s.sql_id,
s.blocking_session,
l.ctime,
o.obj#,
t.name
TYPE_NM,
t.id1_tag,
t.id2_tag,
s.sid,
s.serial#,
'ALTER SYSTEM KILL SESSION '''
|| S.sid
|| ','
|| S.serial#
|| ',@'
|| S.INST_ID
|| ''';'
CMD_KILL
FROM GV$lock l,
GV$session s,
sys.obj$ o,
GV$lock_type t
WHERE 1 = 1
AND s.TYPE != 'BACKGROUND'
-- and s.username = 'EP_APP'
-- and s.sid = 4179
AND l.sid = s.sid
AND l.TYPE IN ('TM', 'TX', 'UL')
AND o.obj#(+) = DECODE (L.ID2, 0, L.ID1, -1)
AND t.TYPE = l.TYPE
CONNECT BY PRIOR s.sid = s.blocking_session
AND PRIOR l.id1 = l.id1
AND PRIOR l.id2 = l.id2
START WITH s.blocking_session IS NULL
ORDER SIBLINGS BY lock_tm DESC, lck_hold
--order by lck_hold, l.ctime desc, l.sid;;
;
;
1.2 해당 sid 와 serial 번호로 락걸린 object name 을 확인[편집]
SELECT A.SID
, A.SERIAL#
, object_name
, A.SID || ', ' || A.SERIAL# AS KILL_TASK
FROM V$SESSION A
INNER JOIN V$LOCK B
ON A.SID = B.SID
INNER JOIN DBA_OBJECTS C
ON B.ID1 = C.OBJECT_ID
WHERE B.TYPE = 'TM'
;
1.3 sid 와 시리얼 번호로 세션 해제[편집]
select 'ALTER SYSTEM KILL SESSION '''||a.sid||','||serial#||''';'
from v$session a, v$lock b, dba_objects c
where a.sid=b.sid and b.id1=c.object_id and b.type='TM'
and c.owner='OOADM' and c.object_name = 'TB_SA_BIZPLC_M'; --
alter system kill session '45,74';
2 락 발생 사용자 및 OBJECT 조회 + 어떤 sql 를 실행중하여 lock 을 걸고 있는지 확인[편집]
SELECT DISTINCT T1.SESSION_ID
, T2.SERIAL#
, T4.OBJECT_NAME
, T2.MACHINE
, T2.TERMINAL
, T2.PROGRAM
, T3.ADDRESS
, T3.PIECE
, T3.SQL_TEXT
FROM V$LOCKED_OBJECT T1
, V$SESSION T2
, V$SQLTEXT T3
, DBA_OBJECTS T4
WHERE 1=1
AND T1.SESSION_ID = T2.SID
AND T1.OBJECT_ID = T4.OBJECT_ID
AND T2.SQL_ADDRESS = T3.ADDRESS
ORDER BY T3.ADDRESS, T3.PIECE
;
3 락 트리 형태 로 보기[편집]
SELECT level,
LPAD(' ', (level-1)*2, ' ') || NVL(s.username, '(oracle)') AS username,
s.osuser,
s.sid,
s.serial#,
s.lockwait,
s.status,
s.module,
s.machine,
s.program,
TO_CHAR(s.logon_Time,'DD-MON-YYYY HH24:MI:SS') AS logon_time
FROM v$session s
WHERE level > 1
OR EXISTS (SELECT 1
FROM v$session
WHERE blocking_session = s.sid)
CONNECT BY PRIOR s.sid = s.blocking_session
START WITH s.blocking_session IS NULL;
4 테이블 별 LOCK 확인[편집]
SELECT A.SID
, A.SERIAL#
, SUBSTRB(A.USERNAME, 1, 16) AS USERNAME
, SUBSTRB(A.MACHINE, 1, 30) AS MACHINE
, A.TERMINAL
, A.OSUSER
, A.PROGRAM
, SUBSTRB(TO_CHAR(A.LOGON_TIME, 'MM/DD HH24:MI:SS'), 1, 14) AS LOGON_TIME
, SUBSTRB(C.OBJECT_NAME, 1, 58) AS OBJECT_NAME
FROM V$SESSION A
, V$LOCK B
, DBA_OBJECTS C
WHERE A.SID = B.SID AND B.ID1 = C.OBJECT_ID AND B.TYPE = 'TM' AND C.OBJECT_NAME LIKE UPPER('&테이블명');
5 Lock을 잡고있는 세션과 기다리는 세션 조회[편집]
SELECT DECODE(B.LOCKWAIT, NULL, ' ', 'w') AS WW
, B.SID
, B.SERIAL# AS SER#
, SUBSTR(B.MACHINE, 1, 10) AS MACHINE
, SUBSTR(B.PROGRAM, 1, 15) AS PROGRAM
, SUBSTR(A.OBJECT_NAME, 1, 17) AS OBJ_NAME
, SUBSTR(B.STATUS, 1, 1) AS S
, DECODE(B.COMMAND, 0, NULL, 2, 'INSERT', 6, 'UPDATE', 7, 'DELETE', B.COMMAND) AS SQLCMD
, B.PROCESS AS PGM_PSS
FROM V$SESSION B
, (SELECT A.SID, DECODE(B.OWNER, NULL, A.TYPE || '..ing', B.OWNER || '.' || B.OBJECT_NAME) AS OBJECT_NAME
FROM V$LOCK A
, DBA_OBJECTS B
WHERE A.ID1 = B.OBJECT_ID(+)
GROUP BY A.SID, DECODE(B.OWNER, NULL, A.TYPE || '..ing', B.OWNER || '.' || B.OBJECT_NAME)) A
WHERE B.SID = A.SID AND B.TADDR IS NOT NULL;
6 작업 중인 데이터베이스 트랜잭션 조회[편집]
SELECT S.SID
, S.SERIAL#
, S.STATUS
, S.OSUSER
, S.USERNAME
, T.STATUS
, T.START_TIME
FROM V$SESSION S
, V$TRANSACTION T
, DBA_ROLLBACK_SEGS R
WHERE S.TADDR = T.ADDR AND T.XIDUSN = R.SEGMENT_ID;
7 열려 있는 커서 조회[편집]
SELECT A.SID
, A.OSUSER
, COUNT(B.SID) AS "CURSOR"
, A.PROGRAM
, A.STATUS
FROM V$SESSION A
, V$OPEN_CURSOR B
WHERE A.SID = B.SID(+) GROUP BY A.SID, A.OSUSER, A.PROGRAM, A.STATUS;
8 잠금 발생 유형 조회[편집]
SELECT A.SID
, DECODE(A.TYPE
, 'MR', 'MEDIA RECOVERY'
, 'RT', 'REDO THREAD'
, 'UN', 'USER_NAME'
, 'TX', 'TRANSACTION'
, 'TM', 'DML'
, 'UL', 'PL/SQL USER LOCK'
, 'DX', 'DISTRIBUTED XACTION'
, 'CF', 'CONTROL FILE'
, 'IS', 'INSTANCE STATE'
, 'FS', 'FILE SET'
, 'IR', 'INSTANCE RECOVERY'
, 'FS', 'FILE SET'
, 'ST', 'DISK SPACE TRANSACTION'
, 'TS', 'TEMP SEGMENT'
, 'IV', 'LIBRARY CACHE INVAILDATION'
, 'LS', 'LOG START OR SWITCH'
, 'RW', 'ROW WAIT'
, 'SQ', 'SEQUENCE NUMBER'
, 'TE', 'EXTEND TABLE'
, 'TT', 'TEMP TABLE'
, A.TYPE
)
AS "LOCK_TYPE"
, DECODE(A.LMODE
, 0, 'NONE'
, 1, 'NULL'
, 2, 'ROW-S(SS)'
, 3, 'ROW-X(SX)'
, 4, 'SHARE'
, 5, 'S/ROW-X(SSX)'
, 6, 'EXCLUSIVE'
, TO_CHAR(A.LMODE)
)
AS "MODE_HELD"
, DECODE(A.REQUEST
, 0, 'NONE'
, 1, 'NULL'
, 2, 'ROW-S(SS)'
, 3, 'ROW-X(SX)'
, 4, 'SHARE'
, 5, 'S/ROW-X(SSX)'
, 6, 'EXCLUSIVE'
, TO_CHAR(A.REQUEST)
)
AS "MODE_REQUESTED"
, TO_CHAR(A.ID1) AS "LOCK_ID1"
, TO_CHAR(A.ID2) AS "LOCK_ID2"
, DECODE(BLOCK, 0, 'NOT BLOCKING', 1, 'BLOCKING', 2, 'GLOBAL', TO_CHAR(BLOCK)) AS "BLOCKING_OTHERS"
FROM V$LOCK A WHERE (ID1, ID2) IN (SELECT B.ID1, ID2
FROM V$LOCK B
WHERE B.ID1 = A.ID1);
9 잠금 상태 오브젝트 조회[편집]
SELECT A.SESSION_ID
, B.SERIAL#
, A.OS_USER_NAME
, A.ORACLE_USERNAME
, C.OBJECT_NAME
, A.LOCKED_MODE
, A.XIDUSN
FROM V$LOCKED_OBJECT A
, V$SESSION B
, DBA_OBJECTS C
WHERE A.OBJECT_ID = C.OBJECT_ID AND A.SESSION_ID = B.SID;
10 잠금 SQL 구문 조회[편집]
SELECT B.USERNAME AS USERNAME
, C.SID AS SID
, C.OWNER AS OBJECT_OWNER
, C.OBJECT AS OBJECT
, B.LOCKWAIT
, A.PIECE
, A.SQL_TEXT AS SQL
FROM V$SQLTEXT A
, V$SESSION B
, V$ACCESS C
WHERE A.ADDRESS = B.SQL_ADDRESS AND A.HASH_VALUE = B.SQL_HASH_VALUE AND B.SID = C.SID AND C.OWNER!= 'SYS';
11 해당 테이블의 세션을 제거하는 쿼리 KILL / DISCONNECT[편집]
/*
특정 테이블이 락을 발생하고 있으면 세션을 찾아서 중단시킨다.
*/
-- KILL
SELECT 'ALTER SYSTEM KILL SESSION '''|| S.SID||','||S.SERIAL# ||''';' KILL_CMD
, 'ALTER SYSTEM DISCONNECT SESSION '''|| S.SID||','||S.SERIAL# ||'''POST_TRANSACTION/IMMEDIATE;' DISCONNCT_CMD
FROM V$LOCK L
, DBA_OBJECTS O
, V$SESSION S
WHERE L.ID1 = O.OBJECT_ID
AND S.SID = L.SID
AND O.OWNER = 'ESTDBA'
AND O.OBJECT_NAME = 'TMP_GSYM2'
-- DISCONNECT
SELECT 'ALTER SYSTEM DISCONNECT SESSION '''|| S.SID||','||S.SERIAL# ||'''POST_TRANSACTION/IMMEDIATE;'
FROM V$LOCK L, DBA_OBJECTS O
, V$SESSION S
WHERE L.ID1 = O.OBJECT_ID
AND S.SID = L.SID
AND O.OWNER = 'ESTDBA'
AND O.OBJECT_NAME = 'TMP_GSYM2'
12 Blocking Lock Session 확인[편집]
SELECT B.BLOCKING_SESSION AS BLOCKING_SESSION_SID
, C.SID AS LOCK_SESSION_SID
, C.OWNER AS OBJECT_OWNER
, C.OBJECT AS OBJECT
, B.LOCKWAIT
, A.PIECE
, A.SQL_TEXT AS SQL
FROM V$SQLTEXT A
, V$SESSION B
, V$ACCESS C
WHERE A.ADDRESS = B.SQL_ADDRESS
AND A.HASH_VALUE = B.SQL_HASH_VALUE
AND B.SID = C.SID
AND B.BLOCKING_SESSION IS NOT NULL
AND C.OWNER NOT IN ('SYS', 'PUBLIC')
AND C.OBJECT NOT IN ('TOAD_PLAN_TABLE') ORDER BY A.PIECE;