PL/SQL报错Dynamic Performance Tables not accessible

Dynamic Performance Tables not accessible, 
Automatic Statistics Disabled for this session 

You can disable statistics in the preference menu,or obtanin select 
priviliges on the v$session,v$sesstat and v$statname tables 

出现这个错误，是因为开了PLSQL Developer 的统计功能，解决办法就是Tools->Preferences->Options里 把Automatic Statistics前的那个勾子去掉，保存就可以了