查看Oracle中是否有锁表
当执行一条删除或者插入语句删除没几条数据,但是半天没反应,可能是锁表导致,对此表无法进行操作
su - oracle
sqlplus / nolog
conn sys as sysdba
sys
grant connect,resource,dba to TSAMS(用户名);
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;
select b.owner,b.object_name,a.session_id,a.locked_mode from v$locked_object a,dba_objects b where b.object_id = a.object_id;
select b.username,b.sid,b.serial#,logon_time from v$locked_object a,v$session b where a.session_id = b.sid order by b.logon_time;
SELECT sid, serial#, username, osuser FROM v$session;
- 查出锁定表的sid, serial#,os_user_name, machine_name, terminal,锁的type,mode
这个语句将查找到数据库中所有的DML语句产生的锁,还可以发现,
任何DML语句其实产生了两个锁,一个是表锁,一个是行锁。
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;
alter system kill session'210,11562';
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