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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.
When a user logs on, Oracle Database enables all privileges granted explicitly to the user and all privileges in the user's default roles. During the session, the user or an application can use the SET ROLE statement any number of times to change the roles currently enabled for the session.