如何更改数据库的SCN?

[oracle@jumper oracle]$ sqlplus "/ as sysdba"

SQL*Plus: Release 9.2.0.4.0 - Production on Wed Dec 21 10:33:35 2005

Copyright (c) 1982, 2002,  Corporation.  All rights reserved.

Connected to:
9i Enterprise Edition Release 9.2.0.4.0 - Production
With the Partitioning option
JServer Release 9.2.0.4.0 - Production

SQL> col a for 999999999999999
SQL> select CHECKPOINT_CHANGE# a from v$datafile;

              A
---------------
   107374358304
   107374358304
   107374358304

SQL> oradebug setmypid
Statement processed.
SQL> oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [5000BC68, 5000BC88) = 00000019 0002F97F 00004979 
00000000 00000000 00000000 00000000 5000B948
SQL> oradebug poke 0x5000BC69 4 8
BEFORE: [5000BC68, 5000BC70) = 00000019
AFTER:  [5000BC68, 5000BC70) = 00000819

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SQL> select dbms_flashback.get_system_change_number a from dual;

               A
----------------
   8903467399681

SQL> oradebug DUMPvar SGA kcsgscn_
kcslf kcsgscn_ [5000BC68, 5000BC88) = 00000819 0002FA0C 00004A75 
00000000 00000000 00000000 00000000 5000B948
SQL> 
SQL> alter system checkpoint;

System altered.

SQL> select CHECKPOINT_CHANGE# a from v$datafile;

               A
----------------
   8903467399867
   8903467399867
   8903467399867

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SQL> shutdown abort;
ORACLE instance shut down.
SQL> startup
ORACLE instance started.

Total System Global Area  114365800 bytes
Fixed Size                   451944 bytes
Variable Size              50331648 bytes
Database Buffers           62914560 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-00600: internal error code, arguments: [3756], [1], [25], [195904], [2073], [195259], [], [] 

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SQL> recover database using backup controlfile until cancel;
ORA-00279: change 8903467399867 generated at 12/21/2005 10:57:34 needed for thread 1
ORA-00289: suggestion : /opt/oracle/oradata/conner/archive/1_18.dbf
ORA-00280: change 8903467399867 for thread 1 is in sequence #18

Specify log: {=suggested | filename | AUTO | CANCEL}
cancel
ORA-01547: warning: RECOVER succeeded but OPEN RESETLOGS would get error below
ORA-01194: file 1 needs more recovery to be consistent
ORA-01110: data file 1: '/opt/oracle/oradata/conner/system01.dbf'

ORA-01112: media recovery not started

SQL> alter database open resetlogs;

Database altered.

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