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
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WIN7 64 |
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www.htz.pw > select * from v$version;
BANNER ——————————————————————————– Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 – 64bit Production PL/SQL Release 11.2.0.3.0 – Production CORE 11.2.0.3.0 Production TNS for 64-bit Windows: Version 11.2.0.3.0 – Production NLSRTL Version 11.2.0.3.0 – Production |
2，配置_MINIMUM_GIGA_SCN参数
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www.htz.pw > oradebug setmypid Statement processed. www.htz.pw > oradebug dumpvar sga kcsgscn_ kcslf kcsgscn_ [1492D7390, 1492D73C0) = 0018A77E 00000000 00000000 00000000 0000057D 00000000 00000000 00000000 00000000 00000000 492D7020 00000001
www.htz.pw > create pfile=’d:\123.ora’ from spfile;
File created.
www.htz.pw > alter system set “_MINIMUM_GIGA_SCN”=1 scope=spfile;
System altered.
www.htz.pw > startup force ORACLE instance started.
Total System Global Area 784998400 bytes Fixed Size 2259312 bytes Variable Size 260048528 bytes Database Buffers 515899392 bytes Redo Buffers 6791168 bytes Database mounted. Database opened. www.htz.pw > select checkpoint_change# from v$datafile_header;
CHECKPOINT_CHANGE# ——————— 1073741826 1073741826 1073741826 1073741826 这里看到SCN值已经增加 |
3，oradebug推进SCN
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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
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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。 |
WIN ORACLE _MINIMUM_GIGA_SCN推进SCN：等您坐沙发呢！