为了测试性能，构造几个达梦慢sql

select count(0) from sysobjects a,sysobjects b,sysobjects c,(select * from dual connect by level <=50)d ;
select count(0) from sysobjects a,sysobjects b,sysobjects c,(select * from dual connect by level <=100)d ;

100的话大致14秒，根据需要可扩大数量，如果sysobjects内容较多，会更慢，以上基于空库的测试结果，业务对象不多