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What is parameter file? & what is the difference between mapping level and session level variables?



                                                                                                                                                                      
Scenario:

What is parameter file? & what is the difference between mapping level and session level variables?

Solution:

Parameter file it will supply the values to session level variables and mapping level variables.
Variables are of two types:
·         Session level variables
·         Mapping level variables

Session level variables are of four types:
·         $DBConnection_Source
·         $DBConnection_Target
·         $InputFile
·         $OutputFile

Mapping level variables are of two types:
·         Variable
·         Parameter
What is the difference between mapping level and session level variables?
Mapping level variables always starts with $$.
A session level variable always starts with $.


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