WIN ORACLE _MINIMUM_GIGA_SCN推进SCN

基础备份与恢复故障处理特殊恢复 huangtingzhong 发布于 2014-10-23 10:21 抢沙发

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。

1，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

2，配置_MINIMUM_GIGA_SCN参数

www.htz.pw > 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

3，oradebug推进SCN

www.htz.pw > 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

4，event 10015推进SCN

www.htz.pw > 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。

_MINIMUM_GIGA_SCN event 10015 oradebug scn