--查看用户和默认表空间的关系 select username,default_tablespace from dba_users; --查看当前用户能访问的表 select * from user_tables; --Oracle查询用户表 select * from user_all_tables; --Oracle查询用户视图 select * from user_views; --查询所有函数和储存过程: select * from user_source; --查询所有用户: select * from all_users; --select * from dba_users --查看当前用户连接: select * from v$Session; --查看用户角色 SELECT * FROM USER_ROLE_PRIVS; --查看当前用户权限: select * from session_privs; --查看所有用户所拥有的角色 SELECT * FROM DBA_ROLE_PRIVS; --查看所有角色 select * from dba_roles; --查看数据库名 SELECT NAME FROM V$DATABASE; --查看所有表空间使用情况 select a.file_id "FileNo", a.tablespace_name "Tablespace_name", a.bytes "Bytes", a.bytes - sum(nvl(b.bytes, 0)) "Used", sum(nvl(b.bytes, 0)) "Free", sum(nvl(b.bytes, 0)) / a.bytes * 100 "%free" from dba_data_files a, dba_free_space b where a.file_id = b.file_id(+) group by a.tablespace_name, a.file_id, a.bytes order by a.tablespace_name;