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It is possible to provide systems that combine approaches In the TOD approach (Fig 8-11) a host-based DBMS also provides programs which allow the use of preprogrammed search requests (ie, Prog1 in Fig 9-2) The user is prompted for parameters Functions such as le updating (Progn), which require more general processing capabilities, are written by programmers in the PL/1 language Having a host available for processing does not remove all concerns about processing from the DBMS In any database system it is desirable to retrieve data in a form that matches the user s view of the data The selection algorithms for data may become quite complex if a user s requirements for a relation involve selection from multiple les Selection requests addressed to the DBMS may retrieve many tuples, but few programming languages can deal with more than one record at a time The DBMS serving a host language has to be able to provide a set of tuples, one record at a time, in a form the language can understand The interface of a host system and DBMS can lead to problems and ine ciency If the DBMS cannot select tuples based on powerful selection criteria, the DBMS will deliver many tuples to the host programs that the programs will reject, so that retrieval and communication e ort will be wasted The host programs do not know the internal schema of the DBMS, so the requests will not be submitted in an optimal sequence E ective sharing of capabilities requires a very complex interface between host system and DBMS In a self-contained DBMS closer interaction between processing and database is possible, this allows greater e ciency Queries can be rearranged to take advantage of the relative accessing e ectiveness of the query attributes Indexes and other auxiliary information available in the system can be used bene cially It is di cult, however, to provide in a self-contained DBMS all the processing facilities available through conventional computing systems, such as auxiliary les, statistical library programs, simulation systems, and communication facilities to other users and their computers The expectations which the users bring to generalized DBMSs are increasing, so that fewer pure self-contained systems are being implemented The availability of a competent host system provides access to many processing facilities The hybrid approach, where the DBMS provides some packages for self-contained operations as well as access for user programs to carry out operations that are not provided as part of the DBMS, is becoming prevalent 9-1-4 Information Hiding and Secrecy The database content will be easier to adapt to changing conditions if the user s external schema can remain unchanged For that reason, it may seem desirable that the actual database structure remains hidden from the user This implies that the internal database schema is to be kept secret from the user of the external schema Elements of the internal schema that may be of interest to a user are the data representation and access path information The data representation indicates the permissible range of domain values in those systems where domains are not explicit Knowledge of access paths can a ect the processing of transactions where more than one computational sequence is feasible The assumption that favors hiding is that lack of knowledge will prevent users from taking advantage of coding.

Solution to Exercise 17-1. Write a countdown alarm program that uses delegates to notify anyone who is interested that the designated amount of time has passed. You ll need a class to simulate the countdown clock that accepts a message and a number of seconds to wait (supplied by the user). After waiting the appropriate amount of time, the countdown clock should fire off an event and pass the message to any registered observers. (When you re calculating the time to wait, remember that Thread.Sleep( ) takes an argument in milliseconds, and requires a using System. Threading statement.) Create an observer class as well that echoes the received message to the console. The CountDownClock example isn t that much different from the Clock example you saw in the chapter, although it behaves a bit differently. In Tester.Run( ), you ask the user for a string message, and a number of seconds to wait, which you then pass to the instance of CountDownClock. To wait the appropriate number of seconds, you simply use Thread.Sleep(seconds * 1000) so that you re waiting for seconds instead of milliseconds. Once the appropriate amount of time has passed, you check to see whether the event has any subscribers, and then call the delegate. You ll need to create a class that derives from EventArgs to hold the message, and pass that to the delegate. The observer class is relatively simple. It needs to create an event handler that echoes the message to the console, and register that event handler with the delegate. We haven t used the event keyword in this exercise, so this handler is still dangerous.

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