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while loop is similar to the while loop, but the condition is evaluated at the end of the iteration so that the iterated statement is guaranteed to execute at least once The for loop is used to execute a statement a specific number of times The header of the for loop can be used to initialize one or more variables, test a logical condition, and modify the variables The typical use of a for loop is to initialize a counter once, test that a condition is using that counter before each iteration, and modify the counter after each iteration Now you ve seen how you can control the flow of your programs, and combined with user input, we hope you can see how your programs are now a lot more powerful The ability to react to changes in data is what most applications are all about..

In SQL we can declare that a subset of the columns of a table constitute a key by using the UNIQUE constraint At most one of these candidate keys can be declared to be a primary key, using the PRIMARY KEY constraint (SQL does not require that such constraints be declared for a table) Let us revisit our example table de nition and specify key information: CREATE TABLE Students ( sid CHAR(20), name CHAR(30), login CHAR(20), age INTEGER, gpa REAL, UNIQUE (name, age), CONSTRAINT StudentsKey PRIMARY KEY (sid) ) This de nition says that sid is the primary key and that the combination of name and age is also a key The de nition of the primary key also illustrates how we can name a constraint by preceding it with CONSTRAINT constraint-name If the constraint is violated, the constraint name is returned and can be used to identify the error

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After-images are especially useful when les have been destroyed independent of any speci c transaction No transactions have to be reexecuted The cost of restoration can be reduced by sorting the after-images into the le sequence and omitting all older copies Since some blocks are rewritten quite frequently the number of blocks to be replaced during restoration can be greatly reduced

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Transaction progress thread The combination of a transaction-log le and before-

After you write your program in an editor and save it to disk, you must compile it. Compiling is the process of turning the code that you can read into code that the machine can read. For that, you need a compiler. Then, once you ve compiled the program, you need to run and test it. The job of the compiler is to turn your source code into a working program. It turns out to be just slightly more complicated than that because .NET uses an intermediate language called Microsoft Intermediate Language (MSIL, sometimes abbreviated as IL). The compiler reads your source code and produces MSIL. When you run the program, the .NET Just In Time (JIT) compiler reads your MSIL code and produces an executable application in memory. You won t see any of this happen, but it s a good idea to know what s going on behind the scenes.

and after-images provides the capability to recover the les from the current version or from a past version, except where the subsequent use of erroneous stored data by other transactions has further contaminated the le Results presented to users can also have been wrong if the queries referred to bad data In order to determine which transactions were indirectly a ected by a le error, it is necessary to keep a record of every block that was read as well as the blocks that were written by every transaction Since the written blocks have already been copied as after-images and the blocks only read did not change, a simple list of all the a ected blocks will su ce The progress of the transaction is recorded as if a thread were drawn from a ected block to a ected block A list de ning this activity thread is written out on the transaction log at the same time the transaction-complete message is written, as shown in Fig 11-7 No other transactions should have had access to the data written between the commit point and completion of the faulty transaction The activity thread permits listing all subsequent transactions which read data from blocks generated by the faulty transaction Any such transaction found is added to a list of a ected transactions LA, as shown in Fig 11-9 The activity threads of a ected transactions will also be processed to nd yet more a ected transactions The list of a ected transactions also indicates which output messages may have been wrong because data from blocks containing errors were used

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