PLSQL_Oracle Lock锁的处理（案例）

SELECT (   ‘节点 ‘

          || a.inst_id

          || ‘ session ‘

          || a.sid

          || ‘,‘

          || a_s.serial#

          || ‘ 阻塞了节点 ‘

          || b.inst_id

          || ‘ session ‘

          || b.sid

          || ‘,‘

          || b_s.serial#)

            blockinfo,

         a.inst_id,

         a_s.sid,

         a_s.schemaname,

         a_s.module,

         a_s.status,

         a.TYPE lock_type,

         a.id1,

         a.id2,

         DECODE (a.lmode,

                 0, ‘none‘,

                 1, NULL,

                 2, ‘row-S (SS)‘,

                 3, ‘row-X (SX)‘,

                 4, ‘share (S)‘,

                 5, ‘S/Row-X (SSX)‘,

                 6, ‘exclusive (X)‘)

            lock_mode,

         ‘后为被阻塞信息‘ remark_flag,

         b.inst_id blocked_inst_id,

         b_s.sid blocked_sid,

         b.TYPE blocked_lock_type,

         DECODE (b.request,

                 0, ‘none‘,

                 1, NULL,

                 2, ‘row-S (SS)‘,

                 3, ‘row-X (SX)‘,

                 4, ‘share (S)‘,

                 5, ‘S/Row-X (SSX)‘,

                 6, ‘exclusive (X)‘)

            blocked_lock_request,

         b_s.schemaname blocked_schemaname,

         b_s.module blocked_module,

         b_s.status blocked_status,

         b_s.sql_id blocked_sql_id,

         obj.owner blocked_owner,

         obj.object_name blocked_object_name,

         obj.object_type blocked_object_type,

         CASE

            WHEN b_s.row_wait_obj# <> -1

            THEN

               DBMS_ROWID.rowid_create (1,

                                        obj.data_object_id,

                                        b_s.row_wait_file#,

                                        b_s.row_wait_block#,

                                        b_s.row_wait_row#)

            ELSE

               ‘-1‘

         END

            blocked_rowid,  --被阻塞数据的rowid

         DECODE (obj.object_type,

                 ‘TABLE‘,    ‘select * from ‘

                          || obj.owner

                          || ‘.‘

                          || obj.object_name

                          || ‘ where rowid=‘‘‘

                          || DBMS_ROWID.rowid_create (1,

                                                      obj.data_object_id,

                                                      b_s.row_wait_file#,

                                                      b_s.row_wait_block#,

                                                      b_s.row_wait_row#)

                          || ‘‘‘‘,

                 NULL)

            blocked_data_querysql

    FROM gv$lock a,

         gv$lock b,

         gv$session a_s,

         gv$session b_s,

         dba_objects obj

   WHERE     a.id1 = b.id1

         AND a.id2 = b.id2

         AND a.block > 0    --阻塞了其他人

         AND b.request > 0

         AND (   (a.inst_id = b.inst_id AND a.sid <> b.sid)

              OR (a.inst_id <> b.inst_id))

         AND a.sid = a_s.sid

         AND a.inst_id = a_s.inst_id

         AND b.sid = b_s.sid

         AND b.inst_id = b_s.inst_id

         AND b_s.row_wait_obj# = obj.object_id(+)

ORDER BY a.inst_id, a.sid;