1. A few essential architectural concepts

1.1 Data integrity

Secure access to company data is a fundamental property of a transactional programming environment.

Data is potentially shared between all users, making it necessary to manage data access procedures rigorously. Otherwise, access conflicts are inevitable, and data integrity can no longer be guaranteed. What's more, in the event of a dispute, or when restoring the database to a previous state, it is essential to manage the chronology of database operations.

This property is guaranteed by the implementation of two mechanisms that play a crucial role in any transactional programming environment:

• Lock Manager ;

• the Log Manager.

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