Oracle 查询锁之间的依赖关系

 

  注释：

  该sql可查询多会话,非select的DML操作,同时操作A表引起的锁 ..会话之间的关系~

  ....下文有该sql用到的视图/字段的详细注释..

  ....若想显示其他字段可以按照自己需求增加 ..

sql: SELECT disTINCT S.SID , /*会话的唯一标识，通常要对某个会话进行分析前，首先就需要获得该会话的SID。*/                 --S.SERIAL# /*会话的序号*/,                 S.STATE /*WAIT STATE~*/ ,                 S.BLOCKING_SESSION ,                 --SESSION IDENTIFIER OF THE BLOCKING SESSION. THIS COLUMN IS VALID ONLY IF BLOCKING_SESSION_STATUS HAS THE VALUE VALID.                 S.BLOCKING_SESSION_STATUS STATUS, /*THIS COLUMN PROVIDES DETAILS ON WHETHER THERE IS A BLOCKING SESSION: */                 ( CASE                   WHEN sql_TEXT IS NULL /*LO.REQUEST = 0 */                    THEN                    '(SID:' || S.SID || ')会话 sql已跑完'                   ELSE                    '(SID:' || S.SID || ')会话 正执行sql：' || sql_.sql_TEXT                 END ) sql_TEXT /*执行完的sql'sql_TEXT标记sql已跑完，否则标记sql'*/ ,                 --sql_.sql_FULLTEXT sql全文本,                 S.USERNAME /*创建该会话的用户名*/ ,                 O.OWNER || '.' || O.OBJECT_NAME 锁的对象, --V$SESSION.ROW_WAIT_OBJ#若操作完的该字段值=-1，所以关联的V$LOCKED_OBJECT取锁表                 LO.REQUEST   , -- Lock mode in which the process requests the lock 会话申请的锁的模式                 S.EVENT   ,                 S.MACHINE /*客户端的机器名。*/ ,                 S.logoN_TIME /*登陆时间*/ ,                 'ALTER SYstem KILL SESSION ''' || S.SID || ',' || S.SERIAL# || ''';' KILL --若存在锁情况,会用到KILL锁释放~   FROM V$SESSION S   LEFT JOIN V$sql sql_     ON sql_.sql_ID = S.sql_ID   JOIN V$LOCKED_OBJECT L     ON L.SESSION_ID = S.SID   JOIN ALL_OBJECTS O     ON L.OBJECT_ID = O.OBJECT_ID   JOIN V$LOCK LO     ON (LO.BLOCK != 0 OR LO.REQUEST != 0 )     --V$LOCK.block => A value of either 0 or 1, depending on whether or not the lock in question is the blocker     --V$LOCK.REQUEST => Lock mode in which the process requests the lock:下文有值的意义~ ['0 - none']   WHERE LO.SID = L.SESSION_ID    AND LO.SID = S.SID   ORDER BY S.BLOCKING_SESSION DESC ;

注释： --视图==官网注释 --v$session        ==    http://docs.oracle.com/cd/E11882_01/server.112/e40402/dynviews_3016.htm#REFRN30223 --V$sql            ==    http://docs.oracle.com/cd/E11882_01/server.112/e40402/dynviews_3043.htm#REFRN30246 --V$LOCK           ==    http://docs.oracle.com/cd/E11882_01/server.112/e40402/dynviews_2027.htm#REFRN30121 --V$LOCKED_OBJECT  ==    http://docs.oracle.com/cd/E11882_01/server.112/e40402/dynviews_2030.htm#REFRN30125 --ALL_OBJECTS      ==    http://docs.oracle.com/cd/E11882_01/server.112/e40402/statviews_1158.htm#REFRN20146 --显示字段==官网注释： V$SESSION.STATE = Wait state : --WAITING - Session is currently waiting --WAITED UNKNowN TIME - Duration of the last wait is unkNown; this is the value when the parameter TIMED_STATISTICS is set to false --WAITED SHORT TIME - Last wait was less than a hundredth of a second --WAITED KNowN TIME - Duration of the last wait is specified in the WAIT_TIME column   S.BLOCKING_SESSION , --Session identifier of the blocking session. This column is valid only if BLOCKING_SESSION_STATUS has the value VALID. V$SESSION.BLOCKING_SESSION_STATUS = This column provides details on whether there is a blocking session : --VALID - there is a blocking session, and it is identified in the BLOCKING_INSTANCE and BLOCKING_SESSION columns --NO HOLDER - there is no session blocking this session --NOT IN WAIT - this session is not in a wait --UNKNowN - the blocking session is unkNown V$LOCK.REQUEST = Lock mode in which the process requests the lock : --0 - none --1 - null (NULL) --2 - row-S (SS) --3 - row-X (SX) --4 - share (S) --5 - S/Row-X (SSX) --6 - exclusive (X)

祝好~