Oracle系统表

1.查询用户select username from dba_users

2.数据库对象：select username from dba_users

3.表空间：select * from dba_data_files
select * from dba_tablespaces

4.表：select * from dba_tables

5.序列select * from dba_sequences

6.视图：select * from dba_views;
select * from all_views;