Oracle中锁（lock）的用法

SELECT l.session_id sid, s.serial#, l.locked_mode, l.oracle_username, l.os_user_name, s.machine, s.terminal, o.object_name, s.logon_time
FROM v$locked_object l, all_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY sid, s.serial#;

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#;

SELECT s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine, s.terminal, s.logon_time, l.TYPE
FROM v$session s, v$lock l
WHERE s.sid = l.sid
AND s.username IS NOT NULL
ORDER BY sid;

SELECT /*+ rule */
 s.username, DECODE(l.TYPE, 'TM', 'TABLE LOCK', 'TX', 'ROW LOCK', NULL) LOCK_LEVEL, o.owner, o.object_name, o.object_type, s.sid, s.serial#, s.terminal, s.machine, s.program, s.osuser
FROM v$session s, v$lock l, dba_objects o
WHERE l.sid = s.sid
AND l.id1 = o.object_id(+)
AND s.username IS NOT NULL;

SELECT LPAD(' ', DECODE(l.xidusn, 0, 3, 0)) || l.oracle_username user_name, o.owner, o.object_name, o.object_type, s.sid, s.serial#
FROM v$locked_object l, dba_objects o, v$session s
WHERE l.object_id = o.object_id
AND l.session_id = s.sid
ORDER BY o.object_id, xidusn DESC

select v$lock.sid, decode(v$lock.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', 'ST', 'Disk Space Transaction', 'TS', 'Temp Segment', 'IV', 'Library Cache Invalida-tion', 'LS', 'Log Start or Switch', 'RW', 'Row Wait', 'SQ', 'Sequence Number', 'TE', 'Extend Table', 'TT', 'Temp Table', 'Unknown') LockType, rtrim(owner) || '.' ||
        object_name object_name, decode(lmode, 0, 'None', 1, 'Null', 2, 'Row-S', 3, 'Row-X', 4, 'Share', 5, 'S/Row-X', 6, 'Exclusive', 'Unknown') LockMode, decode(request, 0, 'None', 1, 'Null', 2, 'Row-S', 3, 'Row-X', 4, 'Share', 5, 'S/Row-X', 6, 'Exclusive', 'Unknown') RequestMode, ctime, block b
from v$lock, all_objects
where sid > 6
and v$lock.id1 = all_objects.object_id;

select object_id, session_id, serial#, oracle_username, os_user_name, s.process
from v$locked_object a, v$session s
where a.session_id = s.sid;

LOCK   TABLE   table_1   [,table_2,   ...,   table_n]   IN   lock_mode   MODE
  NOWAIT

LOCK   TABLE   loan     IN   SHARE   MODE   ;
LOCK   TABLE   region   IN   EXCLUSIVE   MODE   NOWAIT;
LOCK   TABLE   acct     IN   SHARE   UPDATE   MODE;
LOCK   TABLE   bank     IN   ROW   EXCLUSIVE   MODE   NOWAIT;
LOCK   TABLE   user     IN   SHARE   ROW   EXCLUSIVE   MODE;
LOCK   TABLE   branch   IN   ROW   SHARE   MODE   NOWAIT;
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