A transaction is a sequence of SQL statements that the database system treats as a unit. A transaction brings the database from one consistent state to another. If a transaction is interrupted, then the database system returns the database to the state it was in before the transaction began (ROLLBACK).
Concepts of the Database System, Transactions
SQL Reference Manual, Transactions
Database Administration in CCMS: MaxDB, Transactions
Database Administration in CCMS: SAP liveCache Technology, Transactions