oracle常用语句

####检查依赖

Select b.table_name  主键表名,b.column_name 主键列名,a.table_name  外键表名,a.column_name 外键列名
  From (Select a.constraint_name,b.table_name,b.column_name,a.r_constraint_name
          From user_constraints a,user_cons_columns b
         Where a.constraint_type = 'R'
           And a.constraint_name = b.constraint_name) a,(Select distinct a.r_constraint_name,b.column_name
          From user_constraints a,user_cons_columns b
         Where a.constraint_type = 'R'
           And a.r_constraint_name = b.constraint_name) b
 Where a.r_constraint_name = b.r_constraint_name

####检查被锁定的表

select object_name,machine,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;