备份spfile 中的一个误区

某书载在备份控制文件的时候，也会自动的备份初始化参数文件，抱着愚钝的

完事亲力亲为的态度，做了如下的小验证。

RMAN> list backup of controlfile;

specification does not match any backup in the repository

RMAN> list backup of spfile;

specification does not match any backup in the repository

现在开始备份控制文件。

RMAN> backup current controlfile;

查看刚才备份的控制文件。

RMAN> list backup of controlfile;

List of Backup Sets

===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

34      Full    9.42M      DISK        00:00:05     07-JUN-12

        BP Key: 42   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T213934

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\12NCVGGM_1_1

  Control File Included: Ckp SCN: 3278250      Ckp time: 07-JUN-12

查看是否同时备份了spfile 。结果是没有。

RMAN> list backup of spfile;

specification does not match any backup in the repository

开启controlfile 的自动备份功能。

RMAN> configure controlfile autobackup on;

现在开始备份datafile 编号为4 的数据文件（users表空间中的数据文件）。

RMAN> backup datafile 4;

备份输出日志中有这么一段。

Starting Control File and SPFILE Autobackup at 07-JUN-12

piece handle=E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-00 comment=NONE

Finished Control File and SPFILE Autobackup at 07-JUN-12

由上面的输出我们可以知道这时候rman 不仅备份了控制文件也同时备份了spfile。

查看备份后的，备份集信息。

RMAN> list backup of controlfile;

List of Backup Sets

===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

34      Full    9.42M      DISK        00:00:05     07-JUN-12

        BP Key: 42   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T213934

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\12NCVGGM_1_1

  Control File Included: Ckp SCN: 3278250      Ckp time: 07-JUN-12

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

36      Full    9.45M      DISK        00:00:03     07-JUN-12

        BP Key: 44   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T214743

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-00

  Control File Included: Ckp SCN: 3279100      Ckp time: 07-JUN-12

RMAN> list backup of spfile;

List of Backup Sets

===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

36      Full    9.45M      DISK        00:00:03     07-JUN-12

        BP Key: 44   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T214743

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-00

       SPFILE Included: Modification time: 07-JUN-12

       SPFILE db_unique_name: ORACLE

现在再来尝试下。使用下面这种方式来顺带备份控制文件的时候，也会同时备份spfile。

RMAN> backup datafile 4 include current controlfile;

Starting Control File and SPFILE Autobackup at 07-JUN-12

piece handle=E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-01 comment=NONE

Finished Control File and SPFILE Autobackup at 07-JUN-12

查看备份后的，备份集信息。

RMAN> list backup of spfile;

List of Backup Sets

===================

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

36      Full    9.45M      DISK        00:00:03     07-JUN-12

        BP Key: 44   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T214743

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-00

  SPFILE Included: Modification time: 07-JUN-12

  SPFILE db_unique_name: ORACLE

BS Key  Type LV Size       Device Type Elapsed Time Completion Time

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

39      Full    9.45M      DISK        00:00:03     07-JUN-12

        BP Key: 47   Status: AVAILABLE  Compressed: NO  Tag: TAG20120607T215540

        Piece Name: E:\ORACLE\ZENG\PRODUCT\11.2.0\DBHOME_1\DATABASE\C-1654872695-20120607-01

  SPFILE Included: Modification time: 07-JUN-12

  SPFILE db_unique_name: ORACLE

如果你把controlfile autobackup 配置成on 的情况下。

 RMAN> backup current controlfile;也会自动的备份spfile。

现在把controlfile autobackup 配置成off。

RMAN> configure controlfile autobackup off;

RMAN> backup datafile 4 include current controlfile;表现就不同了不会自动的备份spfile.

小结：

不要试图总结出什么情况下备份控制文件的时候会自动备份spfile。也不要相信备份控制文件

的时候会自动备份spfile 。你有备份spfile 的需要那就显式的使用RMAN> backup spfile;备份吧。