oracle 查看数据库和表命令

时间:2023-01-20 03:20:36

1、su – oracle 不是必需,适合于没有DBA密码时使用,可以不用密码来进入sqlplus界面。
2、sqlplus /nolog 或sqlplus system/manager 或./sqlplus ;
3、SQL>connect / as sysdba ;(as sysoper)或
connect internal/oracle AS SYSDBA ;(scott/tiger)
conn sys/change_on_install as sysdba;
4、SQL>startup; 启动数据库实例
5、 查看当前的所有数据库: select * from v database;selectnamefromv database;
desc vdatabases; 查看数据库结构字段  
7、怎样查看哪些用户拥有SYSDBA、SYSOPER权限:  
SQL>select * from V_
PWFILE_USERS;
Show user;查看当前数据库连接用户
8、进入test数据库:database test;
9、查看所有的数据库实例:select * from v$instance;
如:ora9i
10、查看当前库的所有数据表:
SQL> select TABLE_NAME from all_tables;
select * from all_tables;
SQL> select table_name from all_tables where table_name like ‘u’;
TABLE_NAME———————————————default_auditing_options
11、查看表结构:desc all_tables;
12、显示CQI.T_BBS_XUSER的所有字段结构:
desc CQI.T_BBS_XUSER;
13、获得CQI.T_BBS_XUSER表中的记录:
select * from CQI.T_BBS_XUSER;
14、增加数据库用户:(test11/test)
create user test11 identified by test default tablespace users Temporary TABLESPACE Temp;
15、用户授权:
grant connect,resource,dba to test11;
grant sysdba to test11;
commit;
16、更改数据库用户的密码:(将sys与system的密码改为test.)
alter user sys indentified by test;
alter user system indentified by test;

17.查看数据库文件的物理路径

select * from dba_data_files ;

18.查看一个表,所在的表空间

select * from all_tables where table_name=’EMP’;

19.查看用户权限:

select * from session_privs;

20.查看用户表空间的配额

select * from user_ts_quotas;

21.查看当前用户的缺省表空间

select * from user_users;

22.查看当前用户的角色

select * from user_role_privs;

23.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;

24.查看用户下所有的表

select * from user_tables;

25.查看某表的创建时间

select object_name,created from user_objects where object_name=upper(‘&table_name’);

26.查看某表的大小

select sum(bytes)/(1024*1024) as “size(M)” from user_segments where segment_name=upper(‘&table_name’);

27.查看放在ORACLE的内存区里的表

select table_name,cache from user_tables where instr(cache,’Y’)>0;

28、索引

  (1)查看索引个数和类别

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

 (2) 查看索引被索引的字段

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

(3)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’);

 29、序列号

  查看序列号,last_number是当前值

  SQL>select * from user_sequences;

 30、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’);

 31、同义词

  查看同义词的名称

  SQL>select * from user_synonyms;

32、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;

 33、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’);