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Introduction to Transactions

Today transactions play a very important role in almost all business sectors (finance, banking, and so on). A transaction encapsulates a set of operations that is either successfully completed or not completed at all.

Let's look at a real-life example of transaction handling. When a customer goes to an ATM to make a transaction, there are a series of operations performed after the customer inserts an ATM card into the machine's card reader slot (see Figure 14.1). They are as follows:

1.	Customer selects the type of operation (withdrawal, deposit, and so on).
2.	Customer enters appropriate details, like customer card number and PIN, which are sent to the bank via the ATM for validation.
3.	Bank validates the details ...