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The modem module allows your Data-Alert to report alarm conditions to the Data-Term display terminal. Each modem module uses a unique code that distinctly identifies itself to the your Data-Term unit. The modem module can also be used to report the exact time of the triggered event. Your Data-Term display unit can then log the various events from different Data-Alert systems located in different locations. The Data-Term display terminal also permits immediate alarm notification via X-10 ac power modules. Various sirens, lamps, etc., can be activated with the X-10 system. The Data-Alert is designed to monitor four different alarm channels or conditions such as motion monitors, temperature sensors, and door switches. Both the Data-Alert and Data-Term display terminal can be expanded to monitor more channels by modifying the software. The modem module is a small add-on daughter board that plugs into the main DataAlert system board. The modem module consists of three integrated circuits. The heart of the modem module is the MX604 1200-baud modem chip, which is animated by the BS2 controller in the Data-Alert. The second major component is the NJ6355 real-time clock chip, which is used to send the exact time of the event to the remote Data-Term display terminal, and an op-amp chip to amplify the outgoing signal from the modem chip. The MX604 modem chip requires only a few discrete components for operation. The modem chip is a full frequency-shift keying (FSK) modem with transmit and

When more than one user is working against a database, we might expect some concurrency problems to appear. Let s describe the most common problem. User A reads a record. User B also reads the record and then changes it. Any changes user A now decides to post to the database will overwrite the changes that user B made to it.

Regardless of the number of tables that they involve, referential cycles pose special problems for referential integrity constraints. For example, suppose that NULL values were not allowed in the primary or foreign keys of the two tables in Figure 11-5. (This is not, in fact, the way the sample database is actually defined, for reasons that will become obvious in a moment.) Consider this database update request and the INSERT statements that attempt to implement it: You have just hired a new salesperson, Ben Adams (employee number 115), who is the manager of a new sales office in Detroit (office number 14).

Two standard solutions for this kind of problem are pessimistic locking and optimistic locking In the pessimistic locking scenario, user A puts a lock on the record so that nobody can change it until he or she is finished with it (We will not go into the details of how locks are implemented Locks are covered in detail in other SQL Server books At this time, it is important to know that it is possible to mark a record so that no,body else can change it) When user A changes the record, he or she also releases the lock and user B can now access the record and change it The trouble with this solution is that user A might go out for lunch or on vacation and, if he or she didn t close the application calling SQL Server, the lock will not be removed from the record.

TABLE 21-1

This scenario is one of the reasons why this kind of solution is not recommended in a client/server environment In the optimistic locking scenario, user A locks the record only while he or she is actually performing the change A mechanism in SQL Server notifies a user if somebody has changed the record in the meantime The user can then decide either to abandon changes or to overwrite the record A simple way to find out if somebody has changed the record since user A read it would be to compare all fields To run this comparison, user A must keep both an original and a changed record, and he or she needs to send them both to the server Then a process on the server must compare the original record with the record in the table to make sure that it wasn t changed.

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Only then can the record be updated This process is obviously slow and it increases network traffic, but there are solutions in the industry that use precisely this method..

IT-1 IT-2 IT-3 IT-4 IT-5 IT-6 IT-7 IT-8 IT-9 IT-10

SQL Server has a timestamp datatype. It is used for versioning records in a table. When you insert or update a record in a table with a timestamp field, SQL Server timestamps the change. Figure 10-2 demonstrates such behavior. The table is created with a timestamp field. When a record is inserted, SQL Server automatically sets its value. When the record is updated, SQL Server increases the value of the timestamp.