以前整理的:
Oracle表空间基本操作
这篇Blog里真的是最基本的操作。其实今天写的内容,也可以放到那里面去。但是还是打算分开来讲。引起一个重视吧。
1. alter database datafile 'file_name' offline drop
该命令不会删除数据文件,只是将数据文件的状态更改为recover。 offline drop命令相当于把一个数据文件至于离线状态,并且需要恢复,并非删除数据文件。数据文件的相关信息还会存在数据字典和控制文件中。
1.1对于归档模式:
alter database datafile 'file_name' offline和offline drop没有什么区别。因为offline之后多需要进行recover才可以online。
如:
SQL>ALTER DATABASE DATAFILE '/u02/oracle/rbdb1/stuff01.dbf' ONLINE;
SQL>ALTER DATABASE DATAFILE '/u02/oracle/rbdb1/stuff01.dbf' OFFLINE;
1.2对于非归档模式:
如果是非归档模式,只能是offline drop.因为非归档模式没有归档文件来进行recover操作,当然,如果offline之后,速度足够块,online redo里的数据还没有被覆盖掉,那么这种情况下,还是可以进行recover的。
oracle 11g:
SQL>ALTER DATABASE DATAFILE '/u02/oracle/rbdb1/users03.dbf' OFFLINE FOR DROP;
2. alter tablesapce tablespace_name drop datafile 'datafile_name'
该语句会删除控制文件和磁盘上的文件,删除之后的原数据文件序列号可以重用。
注意,该语句只能是datafile online的时候才可以使用。如果说对应的数据文件已经是offline for drop,那么仅针对dictionary managed tablespaces可用。
3.示例
SQL> select * from v$version;
BANNER
----------------------------------------------------------------
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Prod
PL/SQL Release 10.2.0.1.0 - Production
CORE10.2.0.1.0Production
TNS for Linux: Version 10.2.0.1.0 - Production
NLSRTL Version 10.2.0.1.0 - Production
SQL> select name from v$datafile;
NAME
--------------------------------------------------------------------------------
+DATA/rac/datafile/system.256.746634087
+DATA/rac/datafile/undotbs1.258.746634089
+DATA/rac/datafile/sysaux.257.746634087
+DATA/rac/datafile/users.259.746634089
+DATA/rac/datafile/undotbs2.264.746634255
SQL> create tablespace dave datafile '+DATA/rac/datafile/dave01.dbf' size 10M;
Tablespace created.
SQL> alter tablespace dave add datafile '+DATA/rac/datafile/dave02.dbf' size 10M;
Tablespace altered.
SQL> select file#,status,name from v$datafile;
FILE# STATUSNAME
---------- ------- -------------------------------------------------------------
1 SYSTEM+DATA/rac/datafile/system.256.746634087
2 ONLINE+DATA/rac/datafile/undotbs1.258.746634089
3 ONLINE+DATA/rac/datafile/sysaux.257.746634087
4 ONLINE+DATA/rac/datafile/users.259.746634089
5 ONLINE+DATA/rac/datafile/undotbs2.264.746634255
6 ONLINE +DATA/rac/datafile/dave01.dbf
7 ONLINE+DATA/rac/datafile/dave02.dbf
SQL> alter database datafile '+DATA/rac/datafile/dave01.dbf' offline;
Database altered.
SQL> set wrap off;
SQL> select file#,status,name from v$datafile;
FILE# STATUSNAME
---------- ------- -------------------------------------------------------------
1 SYSTEM+DATA/rac/datafile/system.256.746634087
2 ONLINE+DATA/rac/datafile/undotbs1.258.746634089
3 ONLINE+DATA/rac/datafile/sysaux.257.746634087
4 ONLINE+DATA/rac/datafile/users.259.746634089
5 ONLINE+DATA/rac/datafile/undotbs2.264.746634255
6 RECOVER +DATA/rac/datafile/dave01.dbf
7 ONLINE+DATA/rac/datafile/dave02.dbf
7 rows selected.
SQL> alter tablespace dave drop datafile 6;
alter tablespace dave drop datafile 6
ERROR at line 1:
ORA-03263: cannot drop the first file of tablespace DAVE
这里报错了,只有online的才能删除。我们删除dave02.dbf看看
SQL> alter tablespace dave drop datafile 7;
Tablespace altered.
--删除成功。
SQL> select file#,status,name from v$datafile;
FILE# STATUSNAME
---------- ------- -------------------------------------------------------------
1 SYSTEM+DATA/rac/datafile/system.256.746634087
2 ONLINE+DATA/rac/datafile/undotbs1.258.746634089
3 ONLINE+DATA/rac/datafile/sysaux.257.746634087
4 ONLINE+DATA/rac/datafile/users.259.746634089
5 ONLINE+DATA/rac/datafile/undotbs2.264.746634255
6 RECOVER +DATA/rac/datafile/dave01.dbf
6 rows selected.
去ASM里看下物理文件是否删除掉了:
[oracle@rac1 ~]$ export ORACLE_SID=+ASM1
[oracle@rac1 ~]$ asmcmd
ASMCMD> ls
DATA/
FRA/
ASMCMD> cd DATA
ASMCMD> ls
DAVE/
DB_UNKNOWN/
RAC/
ASMCMD> cd RAC
ASMCMD> ls
CONTROLFILE/
DATAFILE/
TEMPFILE/
spfiledave.ora
spfilerac.ora
ASMCMD> cd DATAFILE
ASMCMD> ls
SYSAUX.257.746634087
SYSTEM.256.746634087
UNDOTBS1.258.746634089
UNDOTBS2.264.746634255
USERS.259.746634089
dave01.dbf
--对应的物理文件dave02.dbf已经被删除了
我们将datafile 6 online看看:
SQL> alter database datafile 6 online;
alter database datafile 6 online
ERROR at line 1:
ORA-01113: file 6 needs media recovery
ORA-01110: data file 6: '+DATA/rac/datafile/dave01.dbf'
--提示需要recover。这也就是需要归档文件的原因。
SQL>recover datafile 6;
Media recovery complete.
SQL> alter database datafile 6 online;
Database altered.
SQL>select file#,status,name from v$datafile;
FILE# STATUSNAME
---------- ------- -------------------------------------------------------------
1 SYSTEM+DATA/rac/datafile/system.256.746634087
2 ONLINE+DATA/rac/datafile/undotbs1.258.746634089
3 ONLINE+DATA/rac/datafile/sysaux.257.746634087
4 ONLINE+DATA/rac/datafile/users.259.746634089
5 ONLINE+DATA/rac/datafile/undotbs2.264.746634255
6 ONLINE+DATA/rac/datafile/dave01.dbf
6 rows selected.
最后把整个表空间dave drop掉:
SQL> drop tablespace dave including contents and datafiles;
Tablespace dropped.
SQL> select file#,status,name from v$datafile;
FILE# STATUSNAME
---------- ------- -------------------------------------------------------------
1 SYSTEM+DATA/rac/datafile/system.256.746634087
2 ONLINE+DATA/rac/datafile/undotbs1.258.746634089
3 ONLINE+DATA/rac/datafile/sysaux.257.746634087
4 ONLINE+DATA/rac/datafile/users.259.746634089
5 ONLINE+DATA/rac/datafile/undotbs2.264.746634255
去ASM里看一下:
ASMCMD> ls
SYSAUX.257.746634087
SYSTEM.256.746634087
UNDOTBS1.258.746634089
UNDOTBS2.264.746634255
USERS.259.746634089
对应的物理文件没有了。
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