溫習數據庫創建和修改

/*分爲四步 */
/*第1步：創建臨時表空間 */
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：創建數據表空間 */
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：創建用戶並指定表空間 */
create user username identified by password
default tablespace user_data
temporary tablespace user_temp;

[color=red][b][size=x-small]查看錶空間和剩餘表空間[/size][/b][/color]
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;
如下圖：
[img]http://dl.iteye.com/upload/attachment/0083/6490/af157ec5-fc87-356e-bfcf-867a32cd27c3.png[/img]

[color=red][b][size=x-small]修改表空間[/size][/b][/color]
ALTER TABLESPACE app_data ADD DATAFILE
'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF' SIZE 50M;

Meathod2：新增數據文件，並且允許數據文件自動增長
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：允許已存在的數據文件自動增長
ALTER DATABASE DATAFILE 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF'
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

Meathod4：手工改變已存在數據文件的大小
ALTER DATABASE DATAFILE 'D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP02.DBF'
RESIZE 100M;