In BI 7,in loading point of view what is the difference

Question

Hello All
In BI 7,in loading point of view
Upto the first level(upto PSA) we use infopackage and from that layer onwards we use DTP's.
My question is why do we want to use DTPs there? Why cant we use infopackage only?
What is the advantage by using this DTPs for loading the data within BI
Please let me know in this regard
Many Thanks
Swami

Answer 1

Hi Swami,
Although not recommended you can still use infopackages if you want in BI 7.x. The introduction of the DTP was to overcome some disadvantages of using infopackages up to and including release 3.x to load the data targets (especially with datamarts where one infopackage loads several data targets,
if something goes wrong with the load to one of these data targets then it can be very difficult to correct).
This section contains some arguments in brief why the DTP was introduced with BI 7.0 :
Transfer from one source to one target
BW 3.X
One InfoPackage / Request supplies data for several data targets
Fixed sequence of steps (DataSource / transfer rules / update rules / data target)
Fixed source type: Combination DataSource/source system
Fixed target type: Cube or ODS object or master data
No init selection for extraction from infoprovider
One request can produce several error requests, depending on the data targets
No error handling into ODS Objects
Delta management
BI 3.X: The Receiver for DataSources is merely a logical system, which makes it impossible to have a separate delta management for several data targets within
one system
BI 7.0
Data Transfer Process transports data from one data source to one data target; new source and target types can easily be defined
Arbitrary number of steps (filter objects/transformations) between two persistent objects
Init selection available
Request produces error records stored in generic error stack
Error handling into ODS Objects possible
Resume from persistent buffer
Delta management
BI 7.0: The delta management is maintained by the data transfer process which connects arbitrary sources and targets
I hope the above helps.
Des.