温习数据库创建和修改

/*分为四步 */
/*第1步：创建临时表空间  */
create temporary tablespace user_temp 
tempfile 'D:\oracle\oradata\Oracle9i\user_temp.dbf'
size 50m 
autoextend on 
next 50m maxsize 20480m 
extent management local; 

/*第2步：创建数据表空间  */
create tablespace user_data 
logging 
datafile 'D:\oracle\oradata\Oracle9i\user_data.dbf'
size 50m 
autoextend on 
next 50m maxsize 20480m 
extent management local; 

/*第3步：创建用户并指定表空间  */
create user username identified by password 
default tablespace user_data 
temporary tablespace user_temp; 

查看表空间和剩余表空间
select total.tablespace_name,
       round(total.MB, 2) as Total_MB,
       round(total.MB - free.MB, 2) as Used_MB,
       round((1 - free.MB / total.MB) * 100, 2) as Used_Pct
  from (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
          from dba_free_space
         group by tablespace_name) free,
       (select tablespace_name, sum(bytes) / 1024 / 1024 as MB
          from dba_data_files
         group by tablespace_name) total
where free.tablespace_name = total.tablespace_name;
如下图：


修改表空间
ALTER TABLESPACE app_data ADD DATAFILE
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF' SIZE 50M;

Meathod2：新增数据文件，并且允许数据文件自动增长
ALTER TABLESPACE app_data ADD DATAFILE
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP04.DBF' SIZE 50M
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

Meathod3：允许已存在的数据文件自动增长
ALTER DATABASE DATAFILE 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF'
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

Meathod4：手工改变已存在数据文件的大小
ALTER DATABASE DATAFILE 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP02.DBF'
RESIZE 100M;