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;