用戶與表空間的管理

 

一、創建用戶user1

SQL>create user identified by oracle

     Default tablespace users

     Temporary tablespace temp

     Quota 10m on users；

二、日誌文件

1、創建一個日誌組

SQL>alter database add logfile group 4

‘/db/oracle/oradata/yang/redo04.log’ size 4m;

2、增加一個日誌成員

SQL>alter database add logfile member

‘/db/oracle/oradata/yang/redo011.log’ to group 1;

3、刪除日誌組

SQL>alter database drop logfile group 1；

4、刪除日誌組成員

SQL>alter database drop logfile member

‘/db/oracle/oradata/yang/redo044.log’;

5、查看命令

SQL>select member from v$logfile;

SQL>select group#,member from v$logfile order by group#；

二、表空間

1、創建表空間

SQL>create tablespace users1 datafile

     ‘/db/oracle/oradata/yang/users101.dbf’

     Size 10m autoextend on next 1m maxsize unlimited;

2、刪除表空間

SQL>drop tablespace users1 including contents and datafiles；

3、擴張表空間大小

SQL>alter tablespace users1 add datafile

     ‘/db/oracle/oradata/yang/users102.dbf’ size 50m;

SQL>alter database datafile ‘/db/oracle/oradata/yang/users101.dbf’

      Resize 100m;

SQL>alter database datafile  ‘/db/oracle/oradata/yang/users101.dbf’

     Autoextend on next 1m maxsize unlimited;

4、查看命令

查看錶空間與數據文件的對應關係

SQL>select tablespace_name,file_name from dba_data_files；

查看錶空間的總大小

SQL>select tablespace_name sum（bytes/1024/1024）from dba_data_files

     Group by tablespace_name;

查看錶空間的剩餘大小

SQL>select tablespace_name,sum(bytes/1024/1024) from

dba_free_space group by tablespace_name；

查看數據文件的大小

SQL>select name,bytes from v$datafile;