宣告：本文**
oracle的鎖表與解鎖select /*+ rule */ s.username,
decode(l.type,'tm','table lock',
'tx','row lock',
null) lock_level,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
from v$session s,v$lock l,dba_objects o
where l.sid = s.sid
and l.id1 = o.object_id(+)
and s.username is not null
--kill session語句
alter system kill session'50,492';
--以下幾個為相關表
select * from v$lock;
select * from v$sqlarea;
select * from v$session;
select * from v$process ;
select * from v$locked_object;
select * from all_objects;
select * from v$session_wait;
--1.查出鎖定object的session的資訊以及被鎖定的object名
select l.session_id sid, s.serial#, l.locked_mode,l.oracle_username,
l.os_user_name,s.machine, s.terminal, o.object_name, s.logon_time
from v$locked_object l, all_objects o, v$session s
where l.object_id = o.object_id
and l.session_id = s.sid
order by sid, s.serial# ;
--2.查出鎖定表的session的sid, serial#,os_user_name, machine name, terminal和執行的語句
--比上面那段多出sql_text和action
select l.session_id sid, s.serial#, l.locked_mode, l.oracle_username, s.user#,
l.os_user_name,s.machine, s.terminal,a.sql_text, a.action
from v$sqlarea a,v$session s, v$locked_object l
where l.session_id = s.sid
and s.prev_sql_addr = a.address
order by sid, s.serial#;
--3.查出鎖定表的sid, serial#,os_user_name, machine_name, terminal，鎖的type,mode
select s.sid, s.serial#, s.username, s.schemaname, s.osuser, s.process, s.machine,
s.terminal, s.logon_time, l.type
from v$session s, v$lock l
where s.sid = l.sid
and s.username is not null
order by sid;
這個語句將查詢到資料庫中所有的dml語句產生的鎖，還可以發現，
任何dml語句其實產生了兩個鎖，乙個是表鎖，乙個是行鎖。
殺鎖命令
alter system kill session 'sid,serial#'
select /*+ rule */ s.username,
decode(l.type,'tm','table lock',
'tx','row lock',
null) lock_level,
o.owner,o.object_name,o.object_type,
s.sid,s.serial#,s.terminal,s.machine,s.program,s.osuser
from v$session s,v$lock l,dba_objects o
where l.sid = s.sid
and l.id1 = o.object_id(+)
and s.username is not null
如果發生了鎖等待，我們可能更想知道是誰鎖了表而引起誰的等待
以下的語句可以查詢到誰鎖了表，而誰在等待。
以上查詢結果是乙個樹狀結構，如果有子節點，則表示有等待發生。
如果想知道鎖用了哪個回滾段，還可以關聯到v$rollname，其中xidusn就是回滾段的usn
col user_name format a10
col owner format a10
col object_name format a10
col object_type format a10
select /*+ rule */ lpad(' ',decode(l.xidusn ,0,3,0))||l.oracle_username user_name,
o.owner,o.object_name,o.object_type,s.sid,s.serial#
from v$locked_object l,dba_objects o,v$session s
where l.object_id=o.object_id
and l.session_id=s.sid
order by o.object_id,xidusn desc
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