What is batch and describe about types of batches?Grouping of session is known as batch.Batches are two typesSequential: Runs sessions one after the otherConcurrent: Runs session at same time. If you have sessions with source-target dependencies you have to go for sequential batch to start the sessions one after another. If you have several independent sessions you can use concurrent batches. Which runs all the sessions at the same time?What are two types of processes that runs the session?Ans: The two types of processes that runs the session are Load Manager and DTM process.Load manager process starts the session, creates DTM process, and sends post session email when the session completes. DTM process creates threads to initialize the session, read, write and transform data and handle pre-session and post-session operations.