摘要： zt http://www.xifenfei.com/1290.html1、查看数据库版本SQL> select * from v$version where rownum select max(object_id) from t_a;执行计划———————————————————-Plan hash value: 3226265922————————————————————————————–| Id | Operation | Name | Rows | Bytes | Cost (%CPU)| Time |————————————————————————————–| 0 | SELE 阅读全文