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1-7-5 Transaction Processing The most important operating system approach for interactive databases is called transaction processing This method assumes that the computations are naturally small, in terms of both space and time The database system software is assumed to be already available, so that the users computations consist mainly of calls to the database for reading and writing, and a limited amount of numeric and logical computing Such a computation is called a transaction Transactions are started as soon as possible after the user requests them and are permitted to run as long as necessary to ful ll their computational requirements When a transaction comes to a point where it has to wait for a response from terminals or for data from les, it may yield to the system to enable another transaction process to be started or resumed At times a transaction may avoid yielding to prevent release of a le which is not in a well-de ned state A transaction still ties up resources like les that have been exclusively assigned to it, but its total computation time will not have been lengthened by slicing and swapping When a transaction is nished, it will inform the system, which can then free all allocated resources Example 1-1 was written to show a typical transaction program A transaction is also formally de ned as a computation which, after completion, leaves the database in a well-de ned state, or at least not in a worse state than before A failure during the execution of a transaction requires that the database be restored to its original state, Sec 11-3 presents the required mechanisms If only well-behaved transactions operate on a database, the integrity of the database will always be maintained For example, if a transaction is to update a salary and increment the budget amount in a database, it will do either both or neither, so that the sum of the salary amounts will always match the budget A transaction-oriented environment often exercises close control over the computations to prevent one faulty computation from locking up the entire system Limits are applied to program size, execution time, number of le accesses, and locking actions for exclusive use of les This control is applied when the computation is speci ed or bound At execution time little checking is performed and hence the operating system can be considerably less complex A computation which grossly exceeds reasonable limits of resource consumption can be abruptly terminated Typical design constraints are 25 calls to the database system, 2 seconds total execution time, and 25 pages of memory [Inmon79 ] Many database actions can be handled most e ectively in a transaction processing environment.

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Any form of resource sharing is associated with a considerable overhead for operation and management If there is no signi cant bene t to the use of shared resources, a dedicated system that is of just adequate size is preferable Such a system will, of course, not be able to cope well with irregular high-intensity demands Mixed systems, having local and distributed capability as well as access to central shared resources, are of great interest to system designers A distributed system will have data and processing tasks that are of mainly local importance executed at a local computer Requirements for data and processing that cannot be carried out locally will generate requests to remote computers A logically remote computer may be another local computer or a specialized device attached to a central computer Design issues of distributed computation will be covered speci cally in Secs 2-4-4, 5-3-3, 5-4-4, 7, 9-7-1, 11-3-1, 11-3-4, 11-5-4, 13-2-6

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Probably the most straightforward (and elegant) method is to prefix the strings with a keyword (DATE, TIMESTAMP, or INTERVAL) and to adhere to a well-defined notation convention (See the examples in Table 2-3 and the third option in the following list) These are the three options to specify date and time-related constants in SQL: Specify them as alphanumeric constants (strings) and rely on implicit interpretation and conversion by the Oracle DBMS This is dangerous, because things can go wrong if the actual format parameter for that session is different from the format of the string Specify them as alphanumeric constants (strings) and use a CAST or TO_DATE conversion function to specify explicitly how the strings must be interpreted (see 5) Specify them as alphanumeric constants (strings), prefixed with DATE, TIMESTAMP, or INTERVAL.

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We have, up to this point, analyzed the technical performance of le systems The parameters developed in the previous chapters have yet to be translated into nancial costs and economic bene ts before we can provide management with data which will allow them to judge the appropriateness of a database which uses computerbased le systems We have to assume now that the decision to install a database system is made on rational grounds Other considerations that have led to the use of computer systems have been based on the expectation that rapid access to information would eliminate existing operational problems This is unlikely to happen Decisions have also been made in imitation of leaders in the same segment of industry Often substantial pressures are exerted by the sellers of computing equipment In the scope of this book we cannot evaluate all intangible elements which are part and parcel of decisions to install computers, but will rather present a model of a functional evaluation A number of decisions of a nontechnical nature remain, speci cally in the area of attributing nancial or social bene ts to system performance 249

If you use INTERVAL, you also need a suffix to indicate a dimension, such as DAY, MONTH, or YEAR Table 2-3 shows examples of using SQL constants Table 2-3 Examples of SQL Constants (Literals).

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