**

查看表空間大小和使用率**

查看當前用戶使用的表空間情況，使用命令select * from user_users即可，其中username標識用戶名，default_tablespace表示默認的表空間。

如果我們想查看表空間的使用情況，比如表空間利用率等指標，首先我們查詢的用戶必須有dba權(quán)限，使用如下的命令查詢即可
select a.tablespace_name as tablespace_name,total,free,total-free as used,(total-free) as usepercent
from (select tablespace_name,sum(bytes)/1024/1024 total from dba_data_files group by tablespace_name) a,
(select tablespace_name,sum(bytes)/1024/1024 free from dba_data_files group by tablespace_name) b where
a.tablespace_name = b.tablespace_name;

查看oracle下面所有的表空間，使用命令select * from Dba_Tablespaces即可，呈現(xiàn)的信息包括表空間名稱以及表空間的大小等。

查看表空間物理文件的名稱、位置及大小信息，表空間文件通常以dbf的后綴方式存儲。
select tablespace_name,file_id,file_name,round(bytes/(1024*1024),0) total_space from dba_data_files order by tablespace_name;
5.有些查詢表空間的語句需要執(zhí)行用戶需要高的權(quán)限，如何查看當前用戶的角色呢？使用命令select * from user_role_privs即可。

**

增加表空間大小的四種方法

**
Meathod1：給表空間增加數(shù)據(jù)文件
ALTER TABLESPACE app_data ADD DATAFILE
‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF’ SIZE 50M;

Meathod2：新增數(shù)據(jù)文件，并且允許數(shù)據(jù)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(shù)據(jù)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(shù)據(jù)文件的大小
ALTER DATABASE DATAFILE ‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP02.DBF’
RESIZE 100M;

英文版
**

View table space size and usage

**

View the table space used by the current user, and use the command select * from user_ Users, where user name identifies the user name and default_ A tablespace represents the default tablespace.

If we want to view the usage of table space, such as the utilization of table space and other indicators, first of all, the user we query must have DBA permission. Use the following command to query
select a.tablespace_ name as tablespace_ name,total,free,total-free as used,(total-free) as usepercent
from (select tablespace_ name,sum(bytes)/1024/1024 total from dba_ data_ files group by tablespace_ name) a,
(select tablespace_ name,sum(bytes)/1024/1024 free from dba_ data_ files group by tablespace_ name) b where
a.tablespace_ name = b.tablespace_ name;

View all the table spaces under Oracle and use the command select * from DBA_ The information presented includes the name of the table space and the size of the table space.

View the name, location and size information of the physical file in the table space. The table space file is usually stored in the form of DBF suffix.
select tablespace_ name,file_ id,file_ name,round(bytes/(1024*1024),0) total_ space from dba_ data_ files order by tablespace_ name;

Some query table space statements need to be executed, and the user needs high permissions. How to view the role of the current user? Use the command select * from user_ role_ PRIVS.

**

Four ways to increase the size of table space

**
Meathod1: add data file to table space
ALTER TABLESPACE app_ data ADD DATAFILE
‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF’ SIZE 50M;

Meathod2: add new data files and allow them to grow automatically
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: allow existing data files to grow automatically
ALTER DATABASE DATAFILE ‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP03.DBF’
AUTOEXTEND ON NEXT 5M MAXSIZE 100M;

Meathod4: manually changing the size of existing data files
ALTER DATABASE DATAFILE ‘D:\ORACLE\PRODUCT\10.2.0\ORADATA\EDWTEST\APP02.DBF’
RESIZE 100M;

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