Oracle锁表的解决方法及避免锁表问题的最佳实践

SELECT L.SESSION_ID, S.SERIAL#, L.LOCKED_MODE AS "锁模式", 
       L.ORACLE_USERNAME AS "所有者", L.OS_USER_NAME AS "登录系统用户名", 
       S.MACHINE AS "系统名", S.TERMINAL AS "终端用户名", 
       O.OBJECT_NAME AS "被锁表对象名", S.LOGON_TIME AS "登录数据库时间"
  FROM V$LOCKED_OBJECT L
  INNER JOIN ALL_OBJECTS O ON O.OBJECT_ID = L.OBJECT_ID
  INNER JOIN V$SESSION S ON S.SID = L.SESSION_ID;

ALTER SYSTEM KILL SESSION 'SESSION_ID, SERIAL#';

SELECT L.SESSION_ID, S.SERIAL#, L.LOCKED_MODE AS "锁模式", 
       L.ORACLE_USERNAME AS "所有者", L.OS_USER_NAME AS "登录系统用户名", 
       S.MACHINE AS "系统名", S.TERMINAL AS "终端用户名", 
       O.OBJECT_NAME AS "被锁表对象名", S.LOGON_TIME AS "登录数据库时间"
  FROM V$LOCKED_OBJECT L
  INNER JOIN ALL_OBJECTS O ON O.OBJECT_ID = L.OBJECT_ID
  INNER JOIN V$SESSION S ON S.SID = L.SESSION_ID;


 SESSION_ID	SERIAL#	锁模式	所有者	登录系统用户名	系统名	终端用户名	被锁表对象名	登录数据库时间
----------  ------- ----- ------ ------------- ----- --------- --------- ------------
29	84	3 IN	test	WORKGROUP\LA...	LAPTOP-9FDC2903	LIN_USER	2023/2/26 11:08:08

ALTER SYSTEM KILL SESSION '29, 84';

SELECT COUNT(1) FROM V$LOCKED_OBJECT;

SELECT B.OWNER, B.OBJECT_NAME, A.SESSION_ID, A.LOCKED_MODE
  FROM V$LOCKED_OBJECT A, DBA_OBJECTS B
 WHERE B.OBJECT_ID = A.OBJECT_ID;

SELECT T2.USERNAME, T2.SID, T2.SERIAL, T2.LOGON_TIME
  FROM V$LOCKED_OBJECT T1, V$SESSION T2
 WHERE T1.SESSION_ID = T2.SID
 ORDER BY T2.LOGON_TIME;

ALTER SYSTEM KILL SESSION '253, 9542';

SELECT * FROM V$LOCKED_OBJECT;

SELECT SESS.SID, SESS.SERIAL#, LO.ORACLE_USERNAME, LO.OS_USER_NAME, AO.OBJECT_NAME, LO.LOCKED_MODE
  FROM V$LOCKED_OBJECT LO, DBA_OBJECTS AO, V$SESSION SESS, V$PROCESS P
 WHERE AO.OBJECT_ID = LO.OBJECT_ID
   AND LO.SESSION_ID = SESS.SID;

SELECT L.SESSION_ID SID, S.SERIAL#, L.LOCKED_MODE, L.ORACLE_USERNAME, S.USER#, L.OS_USER_NAME, S.MACHINE, S.TERMINAL, A.SQL_TEXT, A.ACTION
  FROM V$SQLAREA A, V$SESSION S, V$LOCKED_OBJECT L
 WHERE L.SESSION_ID = S.SID
   AND S.PREV_SQL_ADDR = A.ADDRESS
 ORDER BY SID, S.SERIAL#;

SET LINE 200;
COL TERMINAL FORMAT A10;
COL PROGRAM FORMAT A20;
COL USERNAME FORMAT A10;
COL MACHINE FORMAT A10;
COL SQL_TEXT FORMAT A40;
SELECT A.SID, A.SERIAL#, A.USERNAME, A.COMMAND, A.LOCKWAIT, A.STATUS, A.MACHINE, A.TERMINAL, A.PROGRAM, A.SECONDS_IN_WAIT, B.SQL_TEXT
  FROM V$SESSION A, V$SQL B
 WHERE B.SQL_ID = A.SQL_ID
   AND (A.BLOCKING_INSTANCE IS NOT NULL AND A.BLOCKING_SESSION IS NOT NULL);

WITH lk AS (
  SELECT BLOCKING_INSTANCE || '.' || BLOCKING_SESSION AS blocker, INST_ID || '.' || SID AS waiter
    FROM GV$SESSION
   WHERE BLOCKING_INSTANCE IS NOT NULL AND BLOCKING_SESSION IS NOT NULL
)
SELECT LPAD('  ', 2 * (LEVEL - 1)) || WAITER LOCK_TREE
  FROM (
    SELECT * FROM lk
    UNION ALL
    SELECT DISTINCT 'root', BLOCKER FROM lk
    WHERE BLOCKER NOT IN (SELECT WAITER FROM lk)
  )
CONNECT BY PRIOR WAITER = BLOCKER
START WITH BLOCKER = 'root';

WITH lk AS (
  SELECT A.BLOCKING_INSTANCE || '.' || A.BLOCKING_SESSION AS blocker,
         A.INST_ID || '.' || A.SID AS waiter,
         (SELECT B.SQL_TEXT || '  ALTER SYSTEM KILL SESSION ''' || C.SID || ', ' || C.SERIAL# || ''''
            FROM GV$SQLAREA B, GV$SESSION C
           WHERE A.BLOCKING_INSTANCE = C.INST_ID
             AND C.SID = A.BLOCKING_SESSION
             AND (C.SQL_ID = B.SQL_ID OR C.PREV_SQL_ID = B.SQL_ID)) AS kill_block_sql,
         (SELECT B.SQL_TEXT || '  ALTER SYSTEM KILL SESSION ''' || A.SID || ', ' || A.SERIAL# || ''''
            FROM GV$SQLAREA B
           WHERE A.INST_ID = B.INST_ID
             AND A.SQL_ID = B.SQL_ID) AS kill_waiter_sql
    FROM GV$SESSION A
   WHERE A.BLOCKING_INSTANCE IS NOT NULL AND A.BLOCKING_SESSION IS NOT NULL
)
SELECT LPAD('  ', 2 * (LEVEL - 1)) || WAITER || '  ' || KILL_WAITER_SQL LOCK_TREE
  FROM (
    SELECT BLOCKER, WAITER, KILL_WAITER_SQL FROM lk
    UNION ALL
    SELECT DISTINCT 'root', BLOCKER, KILL_BLOCK_SQL FROM lk
    WHERE BLOCKER NOT IN (SELECT WAITER FROM lk)
  )
CONNECT BY PRIOR WAITER = BLOCKER
START WITH BLOCKER = 'root';

COL BLOCK_MSG FOR A80
SELECT C.TERMINAL || ' (''' || A.SID || ',' || C.SERIAL# || ''') is blocking ' || B.SID BLOCK_MSG
  FROM V$LOCK A, V$LOCK B, V$SESSION C
 WHERE A.ID1 = B.ID1
   AND A.ID2 = B.ID2
   AND A.BLOCK > 0
   AND A.SID <> B.SID
   AND A.SID = C.SID;