简单查找session过多。

查询最多的用户：

select vs.USERNAME , action,count(1) from v$session vs

group by vs.USERNAME , action;

查询该用户下用的最多的sql:

select vs.SQL_ID,count(1)

 from v$session vs

where vs.USERNAME = 'XXX'

and vs.ACTION = 'XXX'

group by vs.SQL_ID

order by 2 desc;

查出对应的sql:

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select * from v$sqlarea vs

where vs.SQL_ID = '5v5c5v7k7svzs';

查看最多的等待：

select vs.ROW_WAIT_OBJ#,count(1)

 from v$session vs

where vs.USERNAME = 'IES'

and vs.ACTION = 'DZ'

group by vs.ROW_WAIT_OBJ#

;

查看等待的对象

select * from dba_objects t

where t.OBJECT_ID = 449585836;

很可能是sql太慢的原因。