表空间的四种状态：online，offline，read write和ready only

SQL> select file#,status,enabled from v$datafile;

 FILE#     STATUS                ENABLED

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

      1    SYSTEM                READ WRITE

      2    ONLINE                READ WRITE

      3    ONLINE                READ WRITE

      4    ONLINE                READ WRITE

      5    ONLINE                READ WRITE

users表空间状态改变：

SQL>alter tablespace users offline;

SQL>alter tablespace users online;

SQL>alter tablespace users read write;

SQL>alter tablespace users read only;

创建表空间：

SQL>create tablespace tb01 datafile '/u01/oracle/oradata/orcl/tb01.dbf' size 10m autoextent on;

表空间重命名：

SQL>alter tablespace tb01 rename to tb02;

表空间自动扩张,AUTOEXTENSIBLE自动扩张字段：

SQL> select tablespace_name,file_name,autoextensible from dba_data_files;

SQL> select tablespace_name,file_name,autoextensible from dba_data_files;

TABLESPACE_NAME                FILE_NAME                                AUTOEXTENSIBLE

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

USERS                   /home/oracle/oradata/orcl/users01.dbf                    YES

SYSAUX                 /home/oracle/oradata/orcl/sysaux01.dbf                     YES

UNDOTBS1              /home/oracle/oradata/orcl/undotbs01.dbf                    YES

SYSTEM                /home/oracle/oradata/orcl/system01.dbf                    YES

EXAMPLE               /home/oracle/oradata/orcl/example01.dbf                   YES

SQL> select file#,name from v$datafile;

FILE#     NAME

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

1        /home/oracle/oradata/orcl/system01.dbf

2        /home/oracle/oradata/orcl/undotbs01.dbf

3       /home/oracle/oradata/orcl/sysaux01.dbf

4       /home/oracle/oradata/orcl/users01.dbf

5      /home/oracle/oradata/orcl/example01.dbf

SQL>alter database datafile 6 resize autoextend on;

SQL>alter tablespace tb01 add datafile '/u01/oracle/oradata/orcl/tb01.dbf' size 30m autoextent on;

表空间文件重命名：

前提是数据库是归档模式，数据库处于mount或者open模式，open模式的时候，表空间要offline，最后把表空间online：

SQL>alter tablespace tb01 offline;

SQL>ho cp /u01/oracle/oradata/orcl/tb01.dbf /u01/oracle/oradata/orcl/tb02.dbf

SQL>alter tablespace  rename datafile '/u01/oracle/oradata/orcl/tb01.dbf' to '/u01/oracle/oradata/orcl/tb02.dbf';

SQL>alter tablespace tb01 online;

需要介质恢复的话：

SQL>recover tablespace tb01;

删除表空间：

SQL>drop tablespace tb01 including contents and datafiles; 

查看表空间：

SQL> select tablespace_name from dba_data_files;

TABLESPACE_NAME

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

USERS

SYSAUX

UNDOTBS1

SYSTEM

EXAMPLE

SQL> select name from v$tablespace;

NAME

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

SYSTEM

UNDOTBS1

SYSAUX

USERS

TEMP

EXAMPLE