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A database transaction groups CUBRID queries into a unit of consistency (for ensuring valid results in multi-user environment) and restore (for making the results of committed transactions permanent and ensuring that the aborted transactions are canceled in the database despite any failure, such as system failure). A transaction is a collection of one or more queries that access and update the database.

CUBRID allows multiple users to access the database simultaneously and manages accesses and updates to prevent inconsistency of the database. For example, if data is updated by one user, the changes made by this transaction are not seen to other users or the database until the updates are committed. This principle is important because the transaction can be rolled back without being committed.

You can delay permanent updates to the database until you are confident of the transaction result. Also, you can remove (ROLLBACK) all updates in the database if an unsatisfactory result or failure occurs in the application or computer system during the transaction. The end of the transaction is determined by the COMMIT WORK or ROLLBACK WORK statement. The COMMIT WORK statement makes all updates permanent while the ROLLBACK WORK statement cancels all updates entered in the transaction. For details, see the Transaction Commit and Transaction Rollback sections.