DBA常用sql(二)

 session状态：
STATUS VARCHAR2(8) Status of the session:
ACTIVE - Session currently executing SQL
INACTIVE - sql及其session没有释放或正常退出......
KILLED - Session marked to be killed
CACHED - Session temporarily cached for use by Oracle*XA
SNIPED - Session inactive, waiting on the client
查询数据库中持锁和等待锁的用户信息
select  distinct o.object_name, sh.sid "SID", sh.SERIAL# "SERIAL", sh.username||'('||sh.sid||','||sh.SERIAL#||')' "Holder",
        sw.username||'('||sw.sid||','||sw.SERIAL#||')' "Waiter",
        decode(lh.lmode, 1, 'null', 2,
              'row share', 3, 'row exclusive', 4,  'share',
              5, 'share row exclusive' , 6, 'exclusive')  "Lock Type"
  from v$session sw, v$lock lw,all_objects o,  v$session sh, v$lock lh
where lh.id1  = o.object_id
  and  lh.id1  = lw.id1
  and  sh.sid  = lh.sid
  and  sw.sid  = lw.sid
  and  sh.lockwait is null
  and  sw.lockwait is not null
  and  lh.type = 'TM'
  and  lw.type = 'TM';
select /*+ NO_MERGE(a) NO_MERGE(b) NO_MERGE(c) */ 'Wait' "Status", a.username, a.machine, a.sid, a.serial#, a.last_call_et "Seconds", b.id1, c.sql_text "SQL"
from v$session a, v$lock b, v$sqltext c
where a.username is not null
and a.lockwait = b.kaddr
and c.hash_value =a.sql_hash_value
union
select /*+ NO_MERGE(a) NO_MERGE(b) NO_MERGE(c) */ 'Lock' "Status", a.username, a.machine, a.sid, a.serial#, a.last_call_et "Seconds", b.id1, c.sql_text "SQL"
from v$session a, v$lock b, v$sqltext c
where b.id1 in
(select /*+ NO_MERGE(d) NO_MERGE(e) */ distinct e.id1
from v$session d, v$lock e
where d.lockwait = e.kaddr)
and a.username is not null
and a.sid = b.sid
and b.request=0
and c.ha