用户与表空间的管理

 

一、创建用户user1

SQL>create user identified by oracle

     Default tablespace users

     Temporary tablespace temp

     Quota 10m on users；

二、日志文件

1、创建一个日志组

SQL>alter database add logfile group 4

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

2、增加一个日志成员

SQL>alter database add logfile member

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

3、删除日志组

SQL>alter database drop logfile group 1；

4、删除日志组成员

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、表空间

1、创建表空间

SQL>create tablespace users1 datafile

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

     Size 10m autoextend on next 1m maxsize unlimited;

2、删除表空间

SQL>drop tablespace users1 including contents and datafiles；

3、扩张表空间大小

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

查看表空间与数据文件的对应关系

SQL>select tablespace_name,file_name from dba_data_files；

查看表空间的总大小

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

     Group by tablespace_name;

查看表空间的剩余大小

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

dba_free_space group by tablespace_name；

查看数据文件的大小

SQL>select name,bytes from v$datafile;