Oracle数据库 查询相关信息的语句

查看数据库文件的物理路径
select * from dba_data_files ;

查看一个表,所在的表空间
select * from all_tables where table_name=‘EMP’;

查看用户权限：
select * from session_privs;

查看用户表空间的配额
select * from user_ts_quotas;

查看当前用户的缺省表空间
select * from user_users;

查看当前用户的角色
select * from user_role_privs;

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;

查看用户下所有的表
select * from user_tables;

查看某表的创建时间
select object_name,created from user_objects where object_name=upper(’&table_name’);

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;

3、索引

查看索引个数和类别

select index_name,index_type,table_name from user_indexes order by table_name;

查看索引被索引的字段

SQL>select * from user_ind_columns where index_name=upper(’&index_name’);

查看索引的大小

SQL>select sum(bytes)/(1024*1024) as “size(M)” from user_segments

where segment_name=upper(’&index_name’);

4、序列号

查看序列号，last_number是当前值

SQL>select * from user_sequences;

5、视图

查看视图的名称

SQL>select view_name from user_views;

查看创建视图的select语句

SQL>set view_name,text_length from user_views;

SQL>set long 2000; 说明：可以根据视图的text_length值设定set long 的大小

SQL>select text from user_views where view_name=upper(’&view_name’);

6、同义词

查看同义词的名称

SQL>select * from user_synonyms;

7、约束条件

查看某表的约束条件

SQL>select constraint_name, constraint_type,search_condition, r_constraint_name

from user_constraints where table_name = upper(’&table_name’);

SQL>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;

8、存储函数和过程

查看函数和过程的状态

SQL>select object_name,status from user_objects where object_type=‘FUNCTION’;

SQL>select object_name,status from user_objects where object_type=‘PROCEDURE’;

查看函数和过程的源代码

SQL>select text from all_source where owner=user and name=upper(’&plsql_name’);