----------------------------------------------------------------------用户
--查询：当前用户的缺省表空间
select username,default_tablespace from user_users;
--结果：AIXMGQ USERS
--查询：当前用户的权限
select * from user_role_privs;
--结果 1 AIXMGQ CONNECT NO YES NO
-------2 AIXMGQ DBA NO YES NO
-------3 AIXMGQ RESOURCE NO YES NO
---查看当前用户的系统权限和表级权限（好像没啥用）
select * from user_sys_privs;
select * from user_tab_privs;
----------------------------------------------------------------------表
--查看用户下所有的表
select * from user_tables;
--查看名称包含log字符的表
select object_name,object_id from user_objects
where instr(object_name,'LOG')>0;
--查看某表的创建时间
select object_name,created from user_objects where object_name='&AIRSPACE_TS';
--查看某表的大小
select sum(bytes)/(1024*1024) as "size(M)" from user_segments
where segment_name=upper('&table_name');
--查看放在ORACLE的内存区里的表
select table_name,cache from user_tables where instr(cache,'Y')>0;
----------------------------------------------------------------------索引
--查看索引个数和类别
select index_name,index_type,TABLE_OWNER,table_name,TABLE_TYPE,UNIQUENESS from user_indexes X order by X.table_name;
--查看索引被索引的字段
select * from user_ind_columns where index_name=upper('&index_name');
--查看索引的大小
select sum(bytes)/(1024*1024) as "size(M)" from user_segments
where segment_name=upper('&index_name');
----------------------------------------------------------------------序号
--查看序列号，last_number是当前值
select * from user_sequences;
----------------------------------------------------------------------视图
--查看视图的名称
select view_name from user_views;
--查看创建视图的select语句
select text from user_views where view_name=upper('&view_name');
----------------------------------------------------------------------同义词
--查看同义词的名称
select * from user_synonyms;
----------------------------------------------------------------------约束条件
--查看某表的约束条件
select constraint_name, constraint_type,search_condition, r_constraint_name
from user_constraints where table_name = upper('&table_name');
--同上，增加了Owner选项
select c.constraint_name,c.constraint_type,cc.column_name
from user_constraints c,user_cons_columns cc
where c.owner = upper('&table_owner') and c.table_name = upper('&table_name')
and c.owner = cc.owner and c.constraint_name = cc.constraint_name
order by cc.position;
----------------------------------------------------------------------存储函数和过程
--查看函数和过程的状态
select object_name,status from user_objects where object_type='FUNCTION';
select object_name,status from user_objects where object_type='PROCEDURE';
--查看函数和过程的源代码
select text from all_source where owner=user and name=upper('&plsql_name');