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Even though you can t control how the database locks data, the SQL commands you execute and how you execute them can have a big impact on how separate concurrent transactions in a database interfere, or don t interfere, with each other.

If you eliminate the code that is specific to the three_d class, you are left with the skeleton for an inserter function, as shown here:

3 0 50 100 150 200 q 250 300 350 400

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Let s look at what might happen if two transactions attempt to modify the same data when the application is not properly designed for concurrency and isolation. Let s assume that we are working on an online reservation system for a small bed & breakfast style hotel. A guest can log on to the site, see which rooms are available, and make reservations for an available room: Time T0 Transaction A Beth logs onto the web site and queries the application for available rooms. The system reads from the database and shows that the Pikes Peak Room is available. Transaction B Jennifer logs onto the web site and performs the same query. Again, the Pikes Peak room is shown as available.

It is important to understand that the macro substitution is simply the replacing of an identifier with its associated string. Therefore, if you want to define a standard message, you might write something like this:

// The first delegate example rewritten to use // statement lambdas. using System; // Declare a delegate type. delegate string StrMod(string s);

Jennifer makes a reservation for the Pikes Peak room. The application updates the database to show that the Pikes Peak room is reserved for Jennifer. Beth makes a reservation for the Pikes Peak room. The application updates the database, this time setting the data to show that the room is reserved for Beth.

One of the signi cant additions to the DVD standard is the widespread adoption of the Universal Data Format (UDF) as the means for dealing with les and volumes stored on disc. Although, theoretically, the data regions of a DVD-ROM can contain any type of data, most companies and organizations have followed the lead championed by OSTA, the Optical Disc Storage Association, and adhered with near-religious zeal to UDF for mapping le and volume structures. Essentially, UDF re nes a more broad framework constructed by the International Standards Organization in ISO 13346. UDF places limitations on ISO 13346, de ning a structure that supports optional multivolume and multipartition divisions on a disc. This allows DVD-ROMs that include lename translations between platforms and support for extended attributes, such as the resource forks, icons, and le/creator types that are familiar to Macintosh users.

Personal Computers Hardware standardization Manufacturer approval Data storage media Display device Basic input devices Network capability Some Not required Large High-resolution monitor Keyboard, mouse, joystick, controller (less common) Modems to broadband Home Game Consoles Strict Required Small or nonexistent Color TV Standardized controller Modems, broadband coming

The graphing of cubic and higher power curves requires techniques you will learn in your calculus course. There are, however, some features of higher power curves that can be learned from an "algebraic" look at the curves.

You can see that at T1, the database has been placed into a particular state. In this state, a table has been updated to show certain information. However, because transaction A was operating on the database based on its original view of the data, when it updates the same table, the updates from transaction B are overwritten or lost. This is known as a lost update. Either transaction could have prevented this problem by the proper use of locking. If pessimistic locking had been used, then the first transaction to perform the original query would have locked that data, preventing the other transaction from modifying the data. If optimistic locking had been used, then the second transaction to attempt to update the table would have been prevented from doing so because it would have found that the table had changed since the original query. In the next two sections, we ll look at each type of locking in more detail.

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