1、查看连接数限制

select * from v$resource_limit l where l.RESOURCE_NAME in('processes','sessions');

2、user_tab_columns ?--查看字段

3、user_col_comments ?-- 查看备注

4、查看表创建时间

select object_name,created from user_objects where object_name=‘table_name’

5、查看当前用户的缺省表空间

select username,default_tablespace from user_users; 

6、查看当前用户的角色

select * from user_role_privs; 

7、查看当前用户的系统权限和表级权限??

select * from user_sys_privs;
select * from user_tab_privs;