由于博客中有大量代码，通过页面浏览效果更佳。
最近帮朋友弄一个WIN环境的数据库，需要增加SCN值，由于本机软件有问题，导致ORADEBUG工具不能正常使用，只能通过参数来实现，由于在11.2.0.3环境中，event 10015推SCN已经失效，但是还可以通过_MINIMUM_GIGA_SCN来推进SCN的值。_MINIMUM_GIGA_SCN参数在11.2.0.4环境中已经失效。
12C中推进SCN值
环境介绍
WIN7 64
www.htz.pw > select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for 64-bit Windows: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production配置_MINIMUM_GIGA_SCN参数
oradebug setmypid">Statement processed.
www.htz.pw > oradebug dumpvar sga kcsgscn_
kcslf kcsgscn_ [1492D7390, 1492D73C0) = 0018A77E 00000000 00000000 00000000 0000057D 00000000 00000000 00000000 00000000 00000000 492D7020 00000001
www.htz.pw > create pfile='d:\123.ora' from spfile;
File created.
www.htz.pw > alter system set "_MINIMUM_GIGA_SCN"=1 scope=spfile;
System altered.
www.htz.pw > startup force
ORACLE instance started.
Total System Global Area 784998400 bytes
Fixed Size 2259312 bytes
Variable Size 260048528 bytes
Database Buffers 515899392 bytes
Redo Buffers 6791168 bytes
Database mounted.
Database opened.
www.htz.pw > select checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE#
---------------------
1073741826
1073741826
1073741826
1073741826这里看到SCN值已经增加
oradebug推进SCN
oradebug poke 0x1492D7390 4 88888888;">ORA-00081: address range [0x0FFFFFFFF, 0x100000003) is not readable这里报地址问题，是由于我自己的环境安装有问题，重新安装一个ORACLE HOME问题解决
event推进SCN
select checkpoint_change# from v$datafile_header;">
CHECKPOINT_CHANGE#
------------------
2147504180
2147504180
2147504180
2147504180
www.htz.pw > startup force mount;
ORACLE instance started.
Total System Global Area 784998400 bytes
Fixed Size 2259312 bytes
Variable Size 260048528 bytes
Database Buffers 515899392 bytes
Redo Buffers 6791168 bytes
Database mounted.
www.htz.pw > alter session set events '10015 trace name adjust_scn level 10';
Session altered.
www.htz.pw > alter database open ;
Database altered.
www.htz.pw > select checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE#
------------------
2147524508
2147524508
2147524508
2147524508通过event 10015来增加SCN的方式在11.2.0.3环境中已经失效。
------------------作者介绍-----------------------
姓名：黄廷忠
现就职：Oracle中国高级服务团队
曾就职：OceanBase、云和恩墨、东方龙马等
