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Former Member

时间戳的安全下限

各位大侠;

今天碰到个问题,时间戳的安全上限看的还比较明白,但是安全下线也许是翻译的问题,看得不太明白,那位大侠能给通俗的解释一下,这里谢谢了.

祝好

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4 Answers

  • author's profile photo Former Member
    Former Member
    Posted on Jan 31, 2010 at 05:34 AM

    假设你用一个时间戳做delta field, 每隔1小时抽取一次,当前是08:00, 下一次抽取是09:00,抽取间隔为08:00-09:00, 抽取完后当前时间点变为09:00,下一次抽取从09:00开始。

    如果你设置了安全上限和下限分别为30分钟,那么实际抽取的间隔为07:30-08:30,目的是为了保证不漏掉数据,缺点是有重复数据,但是如果你BW用的overwrite的DSO, 那么没有任何问题。

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  • author's profile photo Former Member
    Former Member
    Posted on Feb 01, 2010 at 05:17 PM

    对于时间戳增量法,系统存在一个延迟时间,即时间戳设置时间与记账时间的差异,比如时间戳是根据创建时间(或输入时间)来确定是否更新的依据,而在抽取开始时(时间戳已标记),此时凭证已创建而未记账(即未更新至数据库),则此次无法抽取到该凭证,但下次抽取时,由于已在时间戳范围之外,也不再进行抽取,从而导致抽取数据遗漏,避免此问题,SAP帮助上给出了通过设置安全抽取时间的方法,,可根据不同的数据源设置不同的安全时间,两个小时为推荐设置,这个安全时间是对于已经创建但未保存在凭证而言,如果在这个安全时间内保存了,则此次抽取将包含在内。

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  • author's profile photo Former Member
    Former Member
    Posted on Mar 21, 2010 at 02:28 AM

    但,好像安全上下限不好用:

    如:我设置安全上线为2小时,那么我期望的是,BW抽取数据的时候,将上次抽取的统计时间之前的2小时的数据再次抽取。但当我再次抽取的时候,通过RSA3 DEBUG的时候,发现时间戳的条件,是统计时间到这次的请求时间。

    如果这样的话,就导致楼上所说的 遗漏的数据 不能被抽取。

    我用的源系统是46C,不知道是否是因为版本的 问题,有时间了,大家可以讨论哦

    回答楼主的问题:

    安全下限一般用于数字指针

    时间上线 = 2010.01.01 12:00:00 - 2 小时

    数字下限 = 10000 - 100

    Edited by: Steven Zhao on Mar 21, 2010 10:31 AM

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  • Posted on Jun 30, 2010 at 02:22 PM

    这个问题就先设为"默认解决"了..补充一下,一般会在roosource里面看deltasafe1 -- lower limit和deltasafe2 -- upper limit..但是CO-OM的datasource,看的是BWOM2_SAFETY, 默认是2小时,这个是写死在extractor的coding里的..

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    • Former Member Vince Lu

      呵呵,,讨论Safety INterval,我觉得RSA7就够了,正好到现在抽取时间一共2个,现在时间-Upper Limit就是上限,RSA7中的状态-Lower Limit就是下限。

      好像这个问题解决了,咱们也不用热心过度了,就此关闭。

      Best Regards

      Martin Xie

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