《使用oradebug修改数据库scn》的评论 https://www.xifenfei.com/2012/08/%e4%bd%bf%e7%94%a8oradebug%e4%bf%ae%e6%94%b9%e6%95%b0%e6%8d%ae%e5%ba%93scn.html 提供7*24专业数据库(Oracle,SQL Server,MySQL,PostgreSQL等)恢复和技术支持@Tel:17813235971 Thu, 11 Dec 2025 02:46:14 +0000 hourly 1 作者：惜分飞 https://www.xifenfei.com/2012/08/%e4%bd%bf%e7%94%a8oradebug%e4%bf%ae%e6%94%b9%e6%95%b0%e6%8d%ae%e5%ba%93scn.html/comment-page-1#comment-3774 Sat, 18 Jan 2014 13:46:09 +0000 https://www.xifenfei.com/?p=3643#comment-3774 1. scn有两个部分组成wrap scn和base scn，所以第一个问题，你去了解scn的组成
2. 关于a是一个假设值

–求出WRAP SCN值
SQL> select 34360240739/4294967296 from dual;

34360240739/4294967296
———————- 8.00011697

–修改内存中scn值(十六进制)
SQL> oradebug poke 0×20009228 4 0x0000000a
BEFORE: [20009228, 2000922C) = 00000000
AFTER:[20009228, 2000922C) = 0000000A

此处算warp scn是要做什么？另外，修改的scn 0x0000000a 这个值怎么算出来的？

]]> 作者：eooyc https://www.xifenfei.com/2012/08/%e4%bd%bf%e7%94%a8oradebug%e4%bf%ae%e6%94%b9%e6%95%b0%e6%8d%ae%e5%ba%93scn.html/comment-page-1#comment-3729 Wed, 15 Jan 2014 01:23:17 +0000 https://www.xifenfei.com/?p=3643#comment-3729 –求出WRAP SCN值
SQL> select 34360240739/4294967296 from dual;

34360240739/4294967296
———————-
8.00011697

–修改内存中scn值(十六进制)
SQL> oradebug poke 0×20009228 4 0x0000000a
BEFORE: [20009228, 2000922C) = 00000000
AFTER: [20009228, 2000922C) = 0000000A

此处算warp scn是要做什么？另外，修改的scn 0x0000000a 这个值怎么算出来的？

]]> 作者：惜分飞 https://www.xifenfei.com/2012/08/%e4%bd%bf%e7%94%a8oradebug%e4%bf%ae%e6%94%b9%e6%95%b0%e6%8d%ae%e5%ba%93scn.html/comment-page-1#comment-961 Sat, 11 Aug 2012 02:42:49 +0000 https://www.xifenfei.com/?p=3643#comment-961 ORADEBUG POKE使用说明

POKE

To poke memory locations use

ORADEBUG POKE address length value
where address and value can be decimal or hexadecimal and length is in bytes

For Example

    ORADEBUG POKE 0x20005F0C 4 0x46495845
    ORADEBUG POKE 0x20005F10 4 0x44205349
    ORADEBUG POKE 0x20005F14 2 0x5A45
WARNING Do not use the POKE command on a production system
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