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A database session represents an application's dialog with a relational database. This chapter is a comprehensive reference for database sessions in TopLink. It describes the fundamental concepts required to connect to the database and to perform queries as well as optional and advanced session and query properties.
A transaction is an event which occurs on the database. Generally a transaction reads a value from the database or writes a value to the database. If you have any concept of Operating Systems, then we can say that a transaction is analogous to processes.lthough a transaction can both read and write on the database, there are some fundamental differences between these two classes of operations.