duplicate data - data mart interface- new

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Data Mart loads leads to duplicate

data after system outage Anil LadMonth 04, 2013



© 2013 SAP AG or an SAP affiliate company. All rights reserved. 2

Background

Data Mart Interface

Data exchange between several BW systems is the point of the Data Mart Interface.

The system that supplies the data is described as the source BW system; the system that receives the

data is the target BW system.

To transfer data between BW systems, you must first link the source BW system to the target BW using

an RFC connection.

Delta Management

A delta update is only possible for loading from SAP source systems:

SAP system -The delta queue is used to extract data from SAP source systems to an BW system.

BW source system - The delta queue is not used to transfer data between BW systems if so-called data

mart scenarios are being used (data transfer between BW data targets). For Export DataSources, when

transferring transaction data, requests are used to determine a delta.




Delta request fails due to system outage

If a datamart delta request fails and the customer runs the delta infopackage again, then automatically a

repeat request is created. If such a repeat request is created, then this will extract the last already

update request and also the new ones.

However, if there is an error in a delta datamart request, then customers must always do as stated in

note 873401.

NOTE : To avoid duplicate data, do not allow for system down scenarios.




Process

Once the data mart load failure occurs in the Process Chain, the correction procedure is MANUAL .

(Note: an automatic repeat via the Process Chain should not happen if Note 1728589 is implemented). The

manual steps are as follows:

Delete (Red) N-request from target PSA

Execute delta – it will be a repeat

The repeat will work correctly if the DM Flag in the source was set before the load failure NO

FURTHER ACTION NEEDED

However, if duplicate data is loaded (because DM Flag was not set before load failure), then as per OSS

873401 Consulting: Data mart delta administration/duplicate data:

Delete the repeat (Green) request from target PSA

Reset Delta Management by deleting it manually in the Source.

Execute delta - This should then transfer ONLY the requests that have not yet been transferred from the

source.




Reset Delta Management I

If you try and delete using this icon , you

get following message




Reset Delta Management II

BEFORE RESET DM

AFTER RESET DM


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Appendix

OSS NOTE 873401 - Consulting: Data mart delta administration/duplicate data

OSS NOTE 902584 - P30:P7:MON: DM status check before setting request to GREEN

OSS NOTE 1728589 - P30:PC:SDL:Autom repeat no longer occurs in PCs for DM srces

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