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Pin 5 is the CLK pin, which connected directly to pin 1 of the PS/2 keyboard connector The output sensing pin can be configured to either provide a high true marking output or a low true marking output High true is the standard and in most cases would be used to connect directly to a microprocessor Pin 6 sets the mode of operation When pin 6 is high, then high true marking is selected, while grounding pin 6 allows the output to be low true marking The DATA pin is fed directly from the PS/2 keyboard connector Whenever the CTL, ALT, and DELETE keys are pressed at the same time, the Katbd will output a low true reset pulse on pin 2 of the encoder.

Locking hints change the behavior of the locking manager as it processes a single Transact-SQL statement. They overwrite behavior set by the transaction isolation level. The following table describes hints that can be used to control locking:

Figure 12-8 shows the order-processing application once more. Again, Joe begins taking an order for 100 ACI-41004 Widgets from his customer. A short time later, Mary also begins talking to her customer about the same Widgets, and her program does a singlerow query to find out how many are available. This time Mary's customer inquires about the ACI-41005 Widgets as an alternative, and Mary's program does a single-row query on that row. Meanwhile, Joe's customer decides to order the Widgets, so his program updates that row of the database and does a COMMIT to finalize the order in the database. After considering the ACI-41005 Widgets as an alternative, Mary's customer decides to order the ACI-41004 Widgets that Mary originally proposed. Her program does a new single-row query to get the information for the ACI-41004 Widgets again. But instead of finding the 139 Widgets that were in stock just a moment ago, the new query

Holds a shared lock until a transaction is completed. The lock will not be released when the resource is no longer needed, but when the transaction is completed. This hint applies only to Select statements. SQL Server will not place shared locks, and it will ignore exclusive locks. Uses update instead of shared locks while reading a table. Specifies the granularity of locks at the row level. Specifies the granularity of locks at the page level. Specifies the granularity of locks at the table level. Specifies the granularity of locks at the table level and the type of lock to be exclusive. Equivalent to the default isolation level (Read Committed).

The keyboard encoder is a great accessory chip for the STAMP 2 processor and will allow you construct many different types of remote control applications from robotics to model trains All of the building block ICs are shown in their respective data sheets in App 1..

6:

This hint is applicable only in Select statements working under the Read Committed isolation level. Resultsets created with this hint will not contain records locked by other transactions. Equivalent to Read Uncommitted isolation level. Equivalent to Repeatable Read isolation level.

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Our next building block IC is the 8-pin Sony IR decoder, which is a specially dedicated programmed microprocessor, shown in Fig. 3-6. The Sony IR decoder is from Cricket Robotics

Locking hints can be used in Select, Insert, Update, or Delete statements. They are part of the From clause. For example, the following command will hold a lock until the transaction is completed:

The next example demonstrates the use of hints in an Update statement and the use of more than one hint in a statement:

In this example, unlike the preceding two, the status of the database has remained an accurate model of the real-world situation. There are only 39 ACI-41004 Widgets left because Joe's customer has purchased 100 of them. There is no problem with Mary having seen uncommitted data from Joe's program the order was complete and committed to the database. However, from the point of view of Mary's program, the database did not remain consistent during her transaction. At the beginning of the transaction, a row contained certain data, and later in the same transaction, it contained different data, so "external events" have interfered with her consistent view of the database. This inconsistency can cause problems even if Mary's program never tries to update the database based on the results of the first query. For example, if the program is accumulating totals or calculating statistics, it cannot be sure that the statistics reflect a stable, consistent view of the data. The problem in this case is that Mary's program has been allowed to see committed updates from Joe's program that affect rows that it has already examined. The SQL2 standard refers to this problem as "P2," also known as the "non-repeatable read" problem. The name comes from the fact that Mary's program can't repeat the same read access to the database and obtain the same results.