表空间相关视图及其他修改表空间操作

V$datafile 数据文件视图

V$tablespace 表空间视图

V$tempfile; 临时表空间视图

SQL>Select TS#,name from v$tablespace;

SQL>Select TS#,FILE#,STATUS from v$datafile;

SQL>Drop tablespace test;

SQL>Drop tablespace test including contents;

SQL>drop tablespace app including contents and datafiles; 删除表空间定义及数据文件

strings spfileVDEDU.ora 查看二进制的spfile文件

Strings spfileVDEDU.ora > initVDEDU.ora 写到pfile里面，注意不要有断行

将表空间设置成只读形式

alter user hr default tablespace erhei;

Alter table space erhei read only;

Insert into t2 values(1);

会报错，因为表空间是只读，无法写入

Alter tablespace erhei read write;将表空间设置为读写

收缩临时表空间

Alter tablespace temp shrink space

Alter tablespace tmp_III shrink keep 30M

注意：如果缩小到的数值大于现在的数值，则命令不报错，但无效

扩大临时表空间

SQL>alter database tempfile ‘/u01/app/oracle/oradata/kingsql/temp_III01.dbf’ resize 300M;

或者增加临时数据文件

Alter database set default bigfile tablespace;创建表空间时默认为大文件表空间（慎用）

Alter database set default smallfile tablespace;

查询表空间是否为大文件表空间

SQL> select tablespace_name,bigfile from dba_tablespaces;

TABLESPACE_NAME        BIG

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

SYSTEM        NO

SYSAUX        NO

UNDOTBS1        NO

TEMP        NO

USERS        NO

EXAMPLE        NO

TEST        NO

TEST2        NO

TEMPTEST        NO

TEST3        NO

HRTBS        NO

指定表使用表空间

先创建表空间

SYS@kingsql%> create tablespace tbs1

  2  datafile '/u01/app/oracle/oradata/kingsql/tbs101.dbf' size 100M autoextend on

  3  extent management local autoallocate

  4  segment space management auto;

Tablespace created.

SYS@kingsql%> create tablespace tbs2

  2  datafile '/u01/app/oracle/oradata/kingsql/tbs201.dbf' size 100M autoextend on

  3  extent management local uniform size 1M

  4  segment space management auto;

Tablespace created.

创建表指定使用表空间

SYS@kingsql%> create table t1 tablespace tbs1 as select * from dba_objects where 1=2;

Table created.

SYS@kingsql%> create table t2 tablespace tbs2 as select * from dba_objects where 1=2;

Table created.

查看表使用的表空间信息

SQL> select owner,SEGMENT_NAME,TABLESPACE_NAME,BYTES,BLOCKS from dba_extents where SEGMENT_NAME='T1' and owner='SYS';

SQL> select owner,SEGMENT_NAME,TABLESPACE_NAME,BYTES,BLOCKS from dba_extents where SEGMENT_NAME='T2' and owner='SYS';