oracle 怎样查一个表中的记录是否被锁住了
怎么查询一个数据库中有几个表引用了其中某个特定表的主键做为其外键的
select t.table_name from user_constraints t
where t.constraint_type='R' and t.r_constraint_name
in(
select s.constraint_name from user_constraints s
where s.table_name='主表名' and s.constraint_type='P')
oracle 怎样查一个表中的记录是否被锁住了
SELECT a.object_id, a.session_id, b.object_name
FROM v$locked_object a, dba_objects b
WHERE a.object_id = b.object_id
为表添加普通索引的SQL语句是怎样的?
create Index index_name on table_name(col1_name,col2_name...);
注:
1.index_name :你建立的索引名
2.table_name:你将要加索引的表名
3.col1_name:你要加索引的列名,从col1_name往后的列名都可以为空,如果不为空就变为组合索引。
给锁住的行解锁(oracle)
select b.owner,b.object_name,l.session_id,l.locked_mode from v$locked_object l, dba_objects b where b.object_id=l.object_id
SELECT 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
2、找出数据库的serial#,以备杀死:
select t2.username,t2.sid,t2.serial#,t2.logon_time from v$locked_object t1,v$session t2 where t1.session_id=t2.sid order by t2.logon_time;
3、杀死该session
alter system kill session 'sid,serial#'
用步骤2中查出来的记录,对应进该语句删除