How to Use Early Delta Initialization

Question

Hi BW Experts,
We are in BI 7.0 Version. Only for Reporting we are using BI 7.0. For modeling, still we are using BW 3.1C only.
We want to use Early Delta Initialization. But this is in Disable Mode in our system
I am getting the following Messages:
<b>"Extractors supporting early delta initialization are not available before plug-in (-A) 2002.1"</b>
<b>"You cannot execute an initialization simulation together with an early delta"</b>
Please can anyone give me the suggestion.
Regards
Anjali

Answer 1

Hi,
you have the option of writing the data into the delta queue or into the delta tables for the application during the initialization request in the source system. This means that you are able to execute the initialization of the delta process (the init request), without having to stop the updating of data in the source system. You can only execute an early delta initialization if the DataSource extractor called in the source system with this data request supports this..Use the Early Delta Initialization indicator in the InfoPackage if you want to avoid a period when no updates can be made (no document processing and update) in the source system while the delta process is being initialized. In some applications (such as LO Cockpit), an update-free period is nevertheless needed to fill the setup tables. In such cases, the update-free time is merely reduced. If you want to carry out early delta initialization, the update in the source system can continue  and the data can be written to the delta queue while the initialization requests are being processed. Note: DataSources that support early delta initialization are available as of the release Plug-In 2002.1. The field ZDD_ABLE (characteristic value = X) for table RSOLTPSOURCE (in BW) or ROOSOURCE (in the source system) indicates whether a DataSource can support early delta initialization.Not always on our systems an important downtime is possible in the initialization process during the reconstruction and the delta init request (just thinking when you need to ask a billing stop period...a real nightmare in some company !)
For this reason, as of PI 2002.1 and BW Release 3.0B, you can use the early delta initialization to perform the initialization for selected datasources (just checking in infopackage update mode tab if this function is available): in this way you can readmit document postings in the OLTP system as early as possible during the initialization procedure..In fact, if an early delta initialization infopackage was started in BW, data may be written immediately to the delta queue.
But, if you are working with the queued delta method, using early delta initialization function doesn’t make sense: as described before, it’s the same method definition that permits to reduce downtime phase.
But leaving aside that, don’t forget that, regardless of the update method selected, it’s ALWAYS necessary to stop any document postings (for the relevant application) during setup tables recompilation run