练习备份controlfile时总是失败，并且报如下错误：

ora-00214:???? 'c:\oracle\product\10.1.0\oradata\test\control01.ctl'??...9373  'c:\oracle\product\10.1.0\oradata\testcontrol03.ctl' ?? 9365 ??

问百度大哥：

cause: An ORA-00214 is issued whenever Oracle detects an inconsistency between two
mirrored copies of the control file. 

All copies of the control file must have the same internal sequence number for
Oracle to start up the database or shut it down in normal or immediate mode.

If the database is running and the checkpoint in the file header could not be
advanced the datafile will be taken offline.

Typical scenarios in which you may receive an ORA-00214 include:

1. You have restored the control file from backup, but forgot
  to copy it onto all of the mirrored copies of the control file
  as listed in the "CONTROL_FILES" parameter in the "init.ora&
quot; file  for this instance (or config.ora in an ifile configuration).

2. You have moved one or more copies of the control file to a
  different location while the database was up and running.

3. You accidentally overwrote one of the copies of the control file
  with an old copy.

4. The database or the system crashed while the mirrored copies of
  the control file were being updated, causing them to be out of sync.

5. You are restoring a database backup that was improperly taken
  with the database up and running ("fuzzy" backup).


fix:

The solution consists in opening the database with a single good copy
of the control file and then shutting the database down and copying
that version of the control file onto the other mirrored copies.
That will cause the next startup to succeed.  The steps to be followed
are:

1. If the database is still up, do a shutdown abort now.

2. Edit the init.ora file for this instance (or config.ora in an ifile
  configuration).

        Find the CONTROL_FILES parameter and modify it to include
        just ONE copy of the control file that you have reasons to
        believe is up-to-date.  For example, if you only have two
        mirrored copies X and Y of the control file:

                CONTROL_FILES = (X, Y)

        and you know you have accidentally overwritten X with an old
        copy, make
       
                CONTROL_FILES = (Y)

        If you are not sure about it, choose any one of the control file
        copies and remove or comment out all the other copies from the
        CONTROL_FILES parameter.

3. Start up the database in restricted mode.

        STARTUP RESTRICT

        If the database comes up fine, move on to Step 4.

        If instead you get ORA-1122, ORA-1110, and ORA-1207, go back to
        Step 2 and make the CONTROL_FILES parameter point to another one
        of the mirrored copies.  If you have already tried each and
        every one of the mirrored copies unsuccessfully, you must create
        a new control file for the database.  See the Solution Reference
        to PR entry 1012929.6 ("How to Recreate the Control File".

        If you get ORA-1113 and ORA-1110 pointing to one of the datafiles,
        it means the copy of the control file you picked is good, but
        the referenced datafile must be recovered before the database can be
        opened.  Try issuing a RECOVER DATABASE command and applying the
        logs you are prompted for.  You may have to resort to the online
        logs to complete media recovery.  For further details, see the
        Solution Reference to PR entry 1012943.6 on ORA-1113.  Once the
        datafile is recovered, issue an ALTER DATABASE OPEN.

4. Shut the database down (normal or immediate).

5. Make all copies of the control file consistent.

        Copy the good mirrored copy of the control file that you just used
        to bring the database up onto all other copies, as originally listed
        in the CONTROL_FILES parameter of your init.ora file (or config.ora
        in an ifile configuration).

6. Restore the CONTROL_FILES parameter to its original value.

        Edit the init.ora file for this instance (or config.ora in an ifile
        configuration) to make the CONTROL_FILES parameter include
        all mirrored copies of the control file again.

7. Start up the database.
原来是拷贝的controlfile与原文件不一致，估计是开始拷出来后，练习时凑巧失败，之后一直以为是语句问题就没再重新拷贝。