1. 新表空间的创建

语法格式:

CREATE TABLESPACE 表空间名 DATAFILE 文件标识符[,文件标识符]...

[DEFAULT STORAGE(存储配置参数)]  [ONLINE\OFFLINE];

其中:文件标识符=’文件名’[SIZE整数[K\M][REUSE]

2. 修改表空间配置

语法格式:

ALTER TABLESPCE 表空间名 (ADD DATAFILE 文件标识符[,文件标识符]...

\RENAME DATAFILE ’文件名’[,’文件名’]... TO ’文件名’[,’文件名’]...

\DEFAULT STORAGE(存储配置参数)

\ONLINE\OFFLINE[NORMAL\IMMEDIATE]

\(BEGIN\END)BACKUP);

3. 删除表空间

语法格式:

DROP TABLESPACE 表空间名[INCLUDING CONTENTS AND DATAFILES];

4. 检查表空间使用情况

查询永久表空间剩余及其剩下空间百分比, sql如下:

SQL>select t1.tname "tablespace", t2.total "total/M", t1.free "free/M", t2.total-t1.free "used/M", (t1.free/t2.total)*100 free_percent from ( select sum(nvl(a.bytes,0))/(1024*1024) free, a.tablespace_name tname from dba_free_space a group by a.tablespace_name) t1, (select sum(b.bytes)/(1024*1024) total, b.tablespace_name tname from dba_data_files b group by b.tablespace_name) t2 where t1.tname=t2.tname;

tablespace               total/M     free/M      used/M       FREE_PERCENT

------------------------------  ----------  ---------- ---------- ------------

UNDOTBS1                  300   276.6875    23.3125    92.2291667

SYSAUX                       890   320.0625   569.9375   35.9620787

INDTBS                        110    109.875       .125         99.8863636

……………………………………………………………………

查询临时表空间剩余, sql如下:

SQL>select tablespace_name,sum(BYTES_USED/1024/1024) "used/M",sum(BYTES_FREE/1024/1024) "free/M" from v$temp_space_header group by tablespace_name;

TABLESPACE_NAME    used/M     free/M

--------------------      ----------   ----------

TEMP                            105           995

5. 扩展表空间

经常会遇到表空间不足而达到Alert Level:  WARNING or

CRITICAL

Using OMF files management on ASM, the datafiles by default are created with autoextending enabled on a maxsize of 32G. Calculating tablespace usage is based on how much autoextensible space is available.

首先查看表空间文件名、是否扩展、最大值等。

SQL>col file_name for a50

SQL>select file_name, autoextensible,maxbytes||'' from dba_data_files where tablespace_name='NETCOOL_DATA';

FILE_NAME                                                          AUT         MAXBYTES||''

--------------------------------------------------  -----------  -------------

+DATA/racdb/datafile/netcool_data.344.722943125    YES 34359721984

方法一、增加数据文件

SQL>alter tablespace NETCOOL_DATA add datafile '+DATA';

Tablespace altered.

SQL>select file_name, autoextensible,maxbytes/1024/1024/1024 GB from dba_data_files where tablespace_name='NETCOOL_DATA';

FILE_NAME                                                             AUT      GB

--------------------------------------------------  ---  ----------

+DATA/racdb/datafile/netcool_data.341.778582069    YES 31.9999847

+DATA/racdb/datafile/netcool_data.344.722943125    YES 31.9999847

方法二、手动增加数据文件尺寸并确保可扩展

SQL>alter database datafile '+DATA/racdb/datafile/netcool_data.344.722943125' resize 300M;

Database altered.

SQL>select file_name, autoextensible,bytes/1024/1024 Mb, STATUS from dba_data_files where tablespace_name='NETCOOL_DATA';

FILE_NAME                             AUT     MB STATUS

------------------------------------------------------------ --- ---------- ---------

+DATA/racdb/datafile/netcool_data.341.778582069          YES    100 AVAILABLE

+DATA/racdb/datafile/netcool_data.344.722943125          YES    300 AVAILABLE

如果相关数据文件没有自动扩展，启用语句如下:

SQL>alter database datafile '+DATA/racdb/datafile/netcool_data.344.722943125' autoextend on maxsize 32000M;

6. 查询数据库默认永久表空间

SQL>select * from database_properties where property_name='DEFAULT_PERMANENT_TABLESPACE';

修改默认永久表空间

SQL> alter database default tablespace NETCOOL_DATA;

Database altered.