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If there was a hardware failure causing actual disk damage, there may not be a current version to apply before-images to In order to enable complete restoration, a more extensive log can be kept of all the activities which a ect the database Data are only appended to the log; it cannot be updated Such a log is often written onto magnetic tape, since on such a tape one can collect economically a sequential record of activities Tapes also provide mechanically reliable storage, particularly for blocks which are already on the part of the tape which is wound on the receiving reel Disks are nding increasing use for logs, and can reduce the labor costs Figure 11-6 illustrates the functions which will be discussed 11-4-1 Recovery Methods The purpose of these logs is to allow the recreation of les Depending on the type of error, database recovery can be performed by Restoration: combining earlier, correct versions of the le with updates due to correct input received later Restoration proceeds forward from a past version to the proper current state Even when versioning is not used throughout, a version or backup copy may be created periodically Rollback: undoing e ects of errors from the current state until an errorfree state is restored After rollback some restoration may be done In either case considerable information must be placed on the transaction log 11-4-2 Elements to Be Logged For the protection of individual transactions (Sec 11-3-1) we required the transaction identi cation, some after-images for completion, and if transaction undo is also supported, corresponding before-images For transaction protection the beforeand after-images need not be kept longer than required to con rm successful completion of the transaction In order to support general restoration or rollback these elements are kept much longer, at least to a point where a complete database backup, as discussed in Sec 11-4-3, is available Also all after-images have to be logged to assure recovery from storage errors Additional elements to be logged are the transaction input, the transaction output, and a transaction progress thread Transaction progress is documented by keeping a list of records or blocks touched by the transaction All these elements will be labeled with the transaction identi er A transaction message, all images, and the activity thread due to one transaction are shown in Fig 11-7.

namespace Example_5_19_ _ _ _for_Loop_Without_Iterator { class Program { public static void Main( ) { for (int counter = 0; counter < 10; ) // no increment { Console.WriteLine("counter: {0} ", counter); // do more work here counter++; // increment counter } } } }

Transaction input In order to select faulty transactions or nd poor input data, the transaction request itself should be logged The full message text entered, or a code identifying the transaction type and its input, will be copied onto the transaction log

If you create a for loop with no initializer or incrementer, like this:

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Replaying of all transactions inputs since the original creation of the database should enable the restoration of any subsequent database state Any input messages of transaction that caused errors are of course eliminated from the replay In this manner a recent and proper le status can be established In practice the cost of such a recovery might be enormous This technique is useful after a recovery to an earlier state by rollback or may be applied to a backup copy of the database

3

for ( ; counter < 10 ; )

In some applications transaction input logging may be very di cult If the messages are long, it may be desirable to copy them on the log by a separate preprocessor before letting them enter the system proper Communication preprocessors are a feature of many larger systems and can help provide backup To increase the chance of correct execution the actual transaction processing should be initiated only when the complete message has been received and logged

you have a while loop in for loop s clothing; and of course that construct is silly, and thus not used very often.

Sec 11-4

It is even possible to leave all the statements out, creating what is known as a forever loop:

In some scienti c applications, data are acquired directly from instruments at high rates Logging of all the data received may exceed available computer resources In these instances, backup can be provided by collecting a copy of the data near the source, possibly on analog tape recorders This method, though, will not allow the level of automatic recovery which we can design for the commercial system where messages can be completely copied by the system onto the transaction log

for ( ;; )

.

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