update rules vs transfer rules

[Former Member]

whats the main difference between update rules and transfer rules, and in which situations do we use each one?

[former_member184494]

gurbinder,

Both the transfer rules and update rules can be used for data transformation. By data transformation I mean activities like validation , format change etc etc. How you use the transfer rules or update rules depends on what is your data transformation logic. If I want some data transformationto be done when the data comes into BW i.e some validation of data when it comes into BW , then I would use the transfer rules , else if I need some summarization from ODS to cube , I would use the update rules since I do not want to change any data coming in. So it all depends on your data model and levels of data transformation.

Arun

[krzysztof_konitz4]

Hi,

Shortly:

transfer rules are linked to InfoSource, update rules are linked to InfoProvider (InfoCube, ODS).

Using transfer rules you can assign DataSource fields to corresponding InfoObjects of the InfoSource

Transfer rules give you possibilty to cleanse data before it is loaded into BW.

Update rules describe how the data is updated into the InfoProvider from the communication structure of an InfoSource.

If you have several InfoCubes or ODS objects connected to one InfoSource you can for example adjust data according to them using update rules.

Krzys