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In the preceding sections we have discussed some of the methods which can be used to collect data to protect the reliability of the database We now will describe a sequence of actions which could be employed when a system failure occurs We will assume that we are using a system which provides the logging facilities discussed earlier Our task is made simpler by the fact that we do not consider the e ects of the interaction of simultaneous programs at this point The following steps will be discussed: Error detection Error-source determination Locating secondary errors Application of corrections 11-5-1 Detection and Error Source Determination The recovery process starts when the existence of an error is detected A variety of entry points into the recovery process can be distinguished We will consider system failures, detected by lack of system action or by unrecoverable redundancy checks, and incorrect output, noted by a user There may be a system crash, either immediately observed by computer operating personnel, who notice that equipment has stopped, or brought to their attention by users whose terminals no longer respond in the expected fashion A crash has

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Sec 11-5

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the advantage that the cause of the error is often obvious and that the time period of incorrect operation has been small If an error has been detected through one of the redundancy-based mechanisms, the error also has had little chance to propagate If the error is due to an erroneous data record obtained from the le, a backward search through the transaction can locate the point where the data was put on the le Such an error has had time to propagate Manual correction of the erroneous element has to be performed if the error is an input-source error If the error is due to malfunction of the storage device itself, it is su cient to locate the after-image which was saved when the block was written and initiate restoration by replacing the bad block If failures are caused by access-path errors, it may be possible to reconstruct the le structure without reference to data portions of the records An index chain which has been damaged can be reconstructed from the data If data records themselves are chained, the damage requires reconstructions from the log tapes Much more insidious is the failure which is detected only by the appearance of incorrect output There may be a very long time interval between occurrence and detection of the error Considerable detective work may be required to locate the cause A search backward through the transaction log can determine all updates and thus nd suspicious transactions

However, every sid value that appears in the instance of the Enrolled table appears in the primary key column of a row in the Students table

Windows and web programs are enormously complex programs that present information to users in graphically rich ways, offering complicated user interfaces, complete with drop-down and pop-up menus, buttons, listboxes, and so forth Behind these interfaces, programs model complex business relationships, such as those among customers, products, orders, and inventory Users can interact with such a program in hundreds, if not thousands, of different ways, and the program must respond appropriately every time To manage this complexity, programmers have developed a technique called objectoriented programming It is based on a very simple premise: you manage complexity by modeling its essential aspects The closer your program models the problem you are trying to solve, the easier it is to understand (and thus to write and to maintain) that program.

Backtracking becomes even more complex when an erroneous value in the database is the actual result of some computation rather than an original input value In order to verify that the computation was carried out correctly, it may have to be repeated To recreate an output, we need 1 The input to the transaction 2 Current images of any block which has not been updated in the interval 3 Before-images of blocks which have been updated in the interval 4 The program used to execute the transaction

Programmers refer to the problem you are trying to solve and all the information you know that relates to your problem as the problem domain For example, if you are writing a program to manage the inventory and sales of a company, the problem domain would include everything you know about how the company acquires and manages inventory, makes sales, handles the income from sales, tracks sales figures, and so forth The sales manager and the stock room manager would be problemdomain experts who can help you understand the situation better A well-designed object-oriented program is filled with objects (things) from the problem domain For example, if the problem domain is an ATM for banking, the things (objects) in your domain might include customers, accounts, monthly statements, and so forth.

Sec 11-5

At the first level of design, you ll think about how these objects interact and what their state, capabilities, and responsibilities are: State A programmer refers to the current conditions and values of an object as that object s state For example, you might have an object representing a customer..

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