Mapping
Parameters
A mapping
parameter represents a constant value that you can define before running a
session. A mapping parameter retains the same value throughout the entire
session.
When you
use a mapping parameter, you declare and use the parameter in a mapping or
mapplet. Then define the value of the parameter in a parameter file for the
session. During the session, the Informatica Server evaluates all references to
the parameter to that value.
Mapping
Variables
Unlike a
mapping parameter, a mapping variable represents a value that can change
through the session. The Informatica Server saves the value of a mapping
variable to the repository at the end of each successful session run and uses
that value the next time you run the session.
Local variable
You can
use local that you create within a mapping in any transformation expression.
For example, if you use a complex tax calculation throughout a mapping, you
might want to write the expression once and designate it. you thereby increase
performance since the Informatica Server performs the calculation only once.
Local are especially useful when used with stored procedure expressions to
capture multiple return values.
System variable
These are constant through out the mapping and cannot be changed.
These are constant through out the mapping and cannot be changed.
Eg.$$SessStartTime
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