oracle 8

锁定查询系列...

----------------------------------------

Q: 如何查询哪些进程相互锁定？

A: 执行以下SQL语句

set pages 800

set lines 150

column blocking format a30

column blocked format a30

select 'INST_ID:'||l1.inst_id||',SID:'||l1.sid "Blocking", 'INST_ID:'||l2.inst_id||',SID:'||l2.sid "Blocked"

from gv$lock l1, gv$lock l2

where l1.block = 1 and l2.request > 0

and l1.id1 = l2.id1 and l1.id2 = l2.id2

/

Q: 如何查询哪些对象被哪些进程锁定？

A: 执行以下SQL语句查询所有对象

set pages 800

set lines 150

column object_name format a40

select s.inst_id,s.sid,s.serial#,o.owner,o.object_name,o.object_type,l.locked_mode

from gv$session s,

gv$locked_object l,

dba_objects o

where s.sid = l.session_id

and s.inst_id = l.inst_id

and l.object_id = o.object_id

/

Q: 如何查询某特定对象被哪些进程锁定？

A: 执行以下语句查询特定对象

select s.inst_id,s.sid,s.serial#,o.owner,o.object_name,o.object_type,l.locked_mode

from gv$session s,

gv$locked_object l,

dba_objects o

where s.sid = l.session_id

and s.inst_id = l.inst_id

and l.object_id = o.object_id

and o.owner = '&owner_name'

and o.object_name = '&object_name'

/

Q: 如何查询那个进程锁死了用户对象(library cache pin and lock)？

A: 执行以下查询

select /*+ ordered */

hs.sid||','||hs.serial#||',@'||hs.inst_id holding_session,

ws.sid||','||ws.serial#||',@'||ws.inst_id waiting_session,

wl.kgllktype lock_or_pin,

decode(hl.kgllkmod, 0, 'None', 1, 'Null', 2, 'Share', 3, 'Exclusive',

'Unknown') mode_held,

decode(wl.kgllkreq, 0, 'None', 1, 'Null', 2, 'Share', 3, 'Exclusive',

'Unknown') mode_requested

from dba_kgllock wl, dba_kgllock hl, gv$session ws, gv$session hs

where hl.kgllkmod not in (0,1) and hl.kgllkreq in (0,1)

and wl.kgllkmod in (0,1) and wl.kgllkreq not in (0,1)

and wl.kgllktype = hl.kgllktype

and wl.kgllkhdl = hl.kgllkhdl

and wl.kgllkuse = ws.saddr

and hl.kgllkuse = hs.saddr

/