[ORACLE]常用的一些sql语句

1、用户

--查看当前用户的缺省表空间
select username,default_tablespace from user_users;

--查看当前用户的角色
SQL>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;

--显示当前会话所具有的权限
select * from session_privs;

--显示指定用户所具有的系统权限
select * from dba_sys_privs where grantee='GAME';

--查看当前用户的缺省表空间
select username,default_tablespace 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;

--查看该用户下所有视图信息
select * from dba_tab_privs where grantee='user_name';

--查看该表创建了哪些视图
select * from dba_dependencies where referenced_name='table_name';

--查看该表或者视图授予给哪些用户
select * from dba_tab_privs where owner='Username' and table_name='view_NAME';

2、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=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
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');

4、序列号

--查看序列号，last_number是当前值
select * from user_sequences;

5、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
set view_name,text_length from user_views;
set long 2000; 说明：可以根据视图的text_length值设定set long 的大小
select text from user_views where view_name=upper('&view_name');

6、同义词

--查看同义词的名称
select * from user_synonyms;

7、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');

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
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');