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最近发表
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- A_H_README_TO_RECOVER勒索恢复
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- ORA-65088: database open should be retried
- Oracle 19c异常恢复—ORA-01209/ORA-65088
- ORA-600 16703故障再现
标签归档:dul有效期
关于dul有效期描述
dul是oracle内部工具,用于在数据库不open启动下挖取数据文件内容,从而最小程度减少数据损失.主要可以恢复如下情况:
1.用于异常断电,强制关闭数据库等故障导致数据库使用隐含参数,bbed等各种非常规数据库恢复方法无法正常open的数据库恢复
2.用于恢复无truncate,drop表恢复
3.用于丢失system表空间文件数据库恢复
4.用于大量坏块数据库恢复
5.用于丢失部分非system数据文件恢复
关于dul的相关使用文档请参考:ORACLE DUL汇总,因为dul是oracle内部工具,不需要数据库open就可以获得数据,为了数据安全,dul软件增加了有效期,本文就是对于dul的有效期进行了描述
关于dul的有效期
熟悉dul的人都清楚,dul从10开始就有有效期之说,一般的有效期是1到2个月,极少数情况会到3个月的有效期.通过试验验证
--使用上一期dul,在未修改系统时间的情况下提示过期 e:\dul10>dul Data UnLoader: 10.2.0.5.25 - Internal Only - on Sat Jan 25 16:17:41 2014 with 64-bit io functions Copyright (c) 1994 2013 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only Cannot start now You need a more recent DUL version for this os --修改系统时间,提示加载成功 e:\dul10>dul Data UnLoader: 10.2.0.5.25 - Internal Only - on Sat Dec 21 16:21:16 2013 with 64-bit io functions Copyright (c) 1994 2013 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only --配置dul挖取数据文件,dul又提示和以前一样错误 e:\dul10>dul Data UnLoader: 10.2.0.5.25 - Internal Only - on Sat Dec 21 16:19:49 2013 with 64-bit io functions Copyright (c) 1994 2013 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only Cannot open file now You need a more recent DUL version for this os --使用最新版dul,在不修改系统时间和配置挖取文件的情况下均正常使用 e:\dul10>dul Data UnLoader: 10.2.0.5.26 - Internal Only - on Sat Jan 25 16:22:15 2014 with 64-bit io functions Copyright (c) 1994 2014 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only e:\dul10>dul Data UnLoader: 10.2.0.5.26 - Internal Only - on Sat Jan 25 16:22:39 2014 with 64-bit io functions Copyright (c) 1994 2014 Bernard van Duijnen All rights reserved. Strictly Oracle Internal Use Only Found db_id = 4156511432 Found db_name = ORA10G
这里可以知道dul是通过系统时间和数据文件头时间两重保证该软件安全,不能通过修改系统时间来破解