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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.
Tips & Warnings. 1  Before querying for locks, request access from the database administrator (DBA). 2  If a lock does not release in an acceptable time, the DBA can cancel the session and release the resource. 3  Recycling the database is rarely necessary to release a lock.eview the v$lock. Oracle table for locking information. Use the select command to view sid, type, lmode and request.. Sid stands for session ID number and identifies the session that owns the lock.