What is Model Versioning or Versioning in Cognos Framework
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Answer Posted / madhukumark80
The versioning allows you to publish a package without
impacting the current reports in use. You can then perform a
staged testing approach to move the existing reports to the
new package.
It's a protection against changes. Existing reports will
continue to use the previous version of the model until they
are opened and resaved or the old version is phased out by a
subsequent model publish. However, if you have a proper
dev/test/prod setup then the model versioning may be less
useful because you should be doing some quality control
testing of your own before the model reaches production.
Example: In the model you have a calculation for Revenue
which is Price * Quantity. You publish this model with 2
model versions specified. Model versioning is tracked using
the timestamp of the publish activity so we will call this
"Package 2010-07-09". Next, you create a report which uses
this package and the Revenue calculation.
Tomorrow comes along and you decide to update the Revenue
calculation to scale the values for some reason. The
calculation becomes Price*Quantity/1000. You publish this
package with 2 model versions. This creates a timestamped
package that we will refer to as "Package 2010-07-10".
If you go and run that report at this point the report will
use "Package 2010-07-09" because that is the version that
was used to create the report even though a later version of
the package exists. This means that you will be showing
unscaled Revenue values because it will still use the
previous calculation definition. If you open the report in
one of the studios you will be asked to update the report to
the latest package version. Saving the report will point the
report to "Package 2010-07-10". For the sake of this example
we will not save the report so it will still be using
"Package 2010-07-09".
Another day goes by and you decide to update the package
again. Now Revenue is defined using Price*Quantity/1000000.
You publish the package again with 2 model versions
specified. This creates "Package 2010-07-11". However, you
specified that you will only keep 2 model versions and this
means that the first package, "Package 2010-07-09", will be
purged from the content store.
If you go and run the report at this point the package that
it uses will no longer be accessible and it will ask you to
update the report to the current version of the package. The
result is that the report will show the revenue values
scaled to millions as defined in the latest package version,
"Package 2010-07-11".
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