Oracle10g ASM数据库中表空间的维护

1.缺省的Oracle命名
当使用ASM + OMF管理时，Oracle会自动分配文件名称，创建相应的文件。
我们创建表空间的工作可以简化为:

create tablespace tablespace_name;

一个命令。
以下是Oracle的缺省命名示例:

$ sqlplus "/ as sysdba"

SQL*Plus: Release 10.1.0.3.0 - Production on Thu Jun 16 09:26:22 2005

Copyright (c) 1982, 2004, Oracle.  All rights reserved.


Connected to:
Oracle Database 10g Enterprise Edition Release 10.1.0.3.0 - 64bit Production
With the Partitioning and Data Mining options

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
+DATADG/mmsdb/datafile/system.259.3
+DATADG/mmsdb/datafile/undotbs1.258.3
+DATADG/mmsdb/datafile/sysaux.257.3
+DATADG/mmsdb/datafile/users.256.3
+DATADG/mmsdb/datafile/platform.278.1
+DATADG/mmsdb/datafile/gateway.279.1

6 rows selected.

2.自定义名称和文件大小创建
如果我们想自定义文件大小及名称，可以使用如下方法创建:

SQL> create tablespace cumail datafile '+DATADG/mmsdb/datafile/cumail'size 100m;

Tablespace created.

SQL> select name from v$datafile;

NAME
--------------------------------------------------------------------------------
+DATADG/mmsdb/datafile/system.259.3
+DATADG/mmsdb/datafile/undotbs1.258.3
+DATADG/mmsdb/datafile/sysaux.257.3
+DATADG/mmsdb/datafile/users.256.3
+DATADG/mmsdb/datafile/platform.278.1
+DATADG/mmsdb/datafile/gateway.279.1
+DATADG/mmsdb/datafile/cumail

7 rows selected.

SQL> drop tablespace cumail including contents and datafiles;

Tablespace dropped.

3.创建ASSM管理表空间
需要指定segment space子句:

SQL> create tablespace cumail
  2  segment space management auto;

Tablespace created.

SQL> select name from v$datafile;

NAME
------------------------------------------------------
+DATADG/mmsdb/datafile/system.259.3
+DATADG/mmsdb/datafile/undotbs1.258.3
+DATADG/mmsdb/datafile/sysaux.257.3
+DATADG/mmsdb/datafile/users.256.3
+DATADG/mmsdb/datafile/platform.278.1
+DATADG/mmsdb/datafile/gateway.279.1
+DATADG/mmsdb/datafile/cumail.280.3

7 rows selected.

SQL> select tablespace_name,extent_management,segment_space_management from dba_tablespaces;

TABLESPACE_NAME                EXTENT_MAN SEGMEN
------------------------------ ---------- ------
SYSTEM                         LOCAL      MANUAL
UNDOTBS1                       LOCAL      MANUAL
SYSAUX                         LOCAL      AUTO
TEMP                           LOCAL      MANUAL
USERS                          LOCAL      AUTO
PLATFORM                       LOCAL      MANUAL
GATEWAY                        LOCAL      MANUAL
CUMAIL                         LOCAL      AUTO

8 rows selected.

3.更改文件大小

SQL> alter database datafile '+DATADG/mmsdb/datafile/cumail.280.3' resize 300m;

Database altered.

SQL> 

4.设置UNIFORM SIZE属性
如果需要设置extent的一些属性，那么必须显示的指定。

SQL> create tablespace ticket extent management local uniform size 128k segment space management auto;

Tablespace created.


SQL> select name ,bytes/1024/1024 from v$datafile;

NAME                                     BYTES/1024/1024
---------------------------------------- ---------------
+DATADG/mmsdb/datafile/system.259.3                  450
+DATADG/mmsdb/datafile/undotbs1.258.3                 25
+DATADG/mmsdb/datafile/sysaux.257.3                  330
+DATADG/mmsdb/datafile/users.256.3                     5
+DATADG/mmsdb/datafile/platform.278.1               1000
+DATADG/mmsdb/datafile/gateway.279.1                1000
+DATADG/mmsdb/datafile/cumail.280.3                  300
+DATADG/mmsdb/datafile/ticket.281.1                  100

8 rows selected.

SQL> alter database datafile '+DATADG/mmsdb/datafile/ticket.281.1' resize 300m;

Database altered.