A teaching set that needs to be implemented to convert data from a source to a target is called a session. Session can be carried out using the session’s manager or pmcmd command. Batch execution can be used to combine sessions executions either in serial manner or in a parallel. Batches can have different sessions carrying forward in a parallel or serial manner.
There can be any number of repositories in informatica but eventually it depends on number of ports.
One can find whether the session is correct or not without connecting the session is with the help of debugging option.