Oracle常用命令收藏

查看数据库名

SELECT t.NAME FROM V$DATABASE t;

查看实例名

SELECT t.INSTANCE_NAME FROM V$INSTANCE t;

查看SID

select t.INSTANCE from v$thread t;

查看域名

select t.VALUE from v$parameter t where t.name = 'db_domain';

查看服务名

select t.VALUE from v$parameter t where t.name = 'service_names';

查看所有表空间的使用率

set linesize 500

col TABLESPACE_NAME for a20

select a.tablespace_name,

round(total / 1024 / 1024 / 1024, 3),

round(free / 1024 / 1024 / 1024, 3),

round((total - free) / 1024 / 1024 / 1024, 3) ,

round((total - free) / total, 4) * 100

from (select tablespace_name, sum(bytes) free

from dba_free_space

group by tablespace_name) a,

(select tablespace_name, sum(bytes) total

from dba_data_files

group by tablespace_name) b

where a.tablespace_name = b.tablespace_name;

修改表空间文件大小

alter database datafile '/DataBase/app/oracle/oradata/orcl/system01.dbf' resize 2G;

查询用户下所有表

/* 查看用户下面的所有的表 */

-- 1 ）方式1：user_tables --

select * from user_tables;

--2 ）方式2: dba_tables --

select table_name from dba_tables where owner='UMS_HW';

查询表空间下的用户

/*查看表空间下有多少用户，tablespace_name表空间 的名字一定要大写 */

select distinct s.owner from dba_segments s where s.tablespace_name ='USERS';

查看表空间的位置和大小

set linesize 200;

col FILE_NAME for a80

col TABLESPACE_NAME for a50

select FILE_NAME,FILE_ID,BYTES/1024/1024/1024,TABLESPACE_NAME FROM dba_data_files where TABLESPACE_NAME='SYSAUX';

删除表空间及其对应的物理文件

drop tablespace TS_VEHICLE_DATA_01 including contents and datafiles cascade constraint;

查看用户所属的表空间

select default_tablespace from dba_users where username='CITIBANK';

删除用户及表空间数据文件

drop tablespace TS_VEHICLE_DATA_01 including contents and datafiles cascade constraint;

扩展已存在用户的表空间

ALTER TABLESPACE USERS ADD DATAFILE

'/DataBase/app/oracle/oradata/orcl/users02.dbf' SIZE 30G AUTOEXTEND off;

查看用户表空间的大小（M）

select tablespace_name, sum(bytes)/1024/1024 from dba_data_files group by tablespace_name;

创建用户表空间

create tablespace chn_grid_data datafile

'/oradata01/promjf/chn_grid_data_01.dbf' size 10g autoextend off

logging

extent management local autoallocate

blocksize 8k

segment space management auto

flashback on;

ALTER USER DBCHNGRIDADM_JX QUOTA UNLIMITED ON CHN_GRID_DATA;