BW Delta Management 学习

Delta Process

ABR:Forming deltas with after, before and reverse images that are updated directly in the delta queue, 采用前镜像、后镜像和反转镜像的更新模式,既支持覆盖又支持累加,所以数据源可以更新到DSO或者CUBE

AIM/AIMD:Forming deltas with after image, which are updated directly in the delta queue. 采用后镜像模式,只支持覆盖,不支持累加,所以该类型数据源不能直接加载到CUBE,一般会先加载到DSO;FI-AR/AP中此种增量处理方式应用较多

ADD只支持累加,采用的是附加镜像的更新方式,所以既可以更新到DSO又可以更新到CUBE


V3 Update Mode

V1同步更新模式,即凭证产生就更新增量,与业务数据同步更新;

V2异步更新模式,就如一个两步的操作一样,第一步业务凭证更新了,然后再更新第二步的数据源增量表

V3异步更新模式,与V2的区别在于他的更新时通过后台事件来触发的,即定一个任务定是收集增量并更新至增量表

 

Update Mode:

Direct Delta:这就是一种V1模式,比如销售订单产生之后,订单数据同步更新到R/3的Delta Queue中,这种模式系统负荷很重,特别是对于业务量大的凭证;

Queued Delta:数据先被收集到一个 Exctraction Queue中(V1模式),然后被送到Delta Queue(V3模式)

Unsterilized V3 Update:此类型的最大特征是 没有序列化,就是说Delta Queue 中销售订单是无序的,这个对于采用overwrite 模式的模型来说是最致命的,所以如果目标队列是DSO的话,还是不要采用这种模式好。

 

Check Delta Queue(RSA7)

Delta Update表示当前Delta Queue的数据

Delta Repetition表示的是上一次提取的Delta数据

Image supported by Datasource

New Image:new record if no same key exit.

Anafter imageshows the status after the change, abefore imagethe status before the change with a negative sign and thereverse imagealso shows the negative sign next to the record while indicating it for deletion.
Deletion:Delete
Acumulated:
ADD

Delta Queue:
The delta queue is a data store for new or changed data records for a DataSource (that have occurred since the last data request). The new or changed data records are either written to the delta queue automatically using an update process in the source system, or by means of the DataSource extractor when a data request is received from the BI system (details will be provided later).

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