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Domain de nitions and their use to restrict assignment can play an important role in keeping improper elements out of a database Furthermore, since the set of values is limited, an e cient encoding can be derived to cover the domain We will try to incorporate such facilities in the schema languages for our database element de nition even where the programming languages do not have such provisions The length of a data element can be xed or variable If the length is xed, it can be speci ed as a number of bits or characters with the element description If the element length is variable, the marking method which is used to determine the length for a given instance of the element can be indicated The available methods are those discussed for marking records (see Sec 2-2-4) The use of variable length data elements leads to a need for variable-length records An example of a variable-length record speci ed in PL/1 is shown in Example 8-3 The variable (address) could also be decomposed into multiple lower level elements

Example A-34. One solution to Exercise 13-1

.

Length Example 8-3

using using using using System; System.Collections.Generic; System.Linq; System.Text;

Variable-Length Record employer record, 2 2 2 2 name CHAR VARYING(40), sex CHAR(6), birthdate INTEGER, address CHAR VARYING(80);

namespace Exercise_13_1 { interface IConvertible { string ConvertToCSharp(string stringToConvert); string ConvertToVB(string stringToConvert); } }

As we have indicated earlier, the record written on the le is a direct image of the declared speci cation The fact that the character strings are speci ed to be VARYING is ignored by most compilers, and the maximum speci ed is always allocated when the employer record is written to a le This practice leads to a considerable waste of space if long records occur infrequently The record cannot be processed without the associated declaration The stored record can be composed as shown in Fig 8-3

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When a relation and its subrelations are implemented in one le we may have alternate data elements in di erent record subtypes Some programming languages support this concept Records in PASCAL allow variants in their structure; a record can have alternate elements Given a variable with two choices, sex = (male,female); then the record of Example 8-3 can be expanded as shown in Example 8-4

Solution to Exercise 13-2. Implement that interface and test it by creating a class ProgramHelper that implements IConvertible. You don t have to write methods to convert the string; just use simple string messages to simulate the conversion. Test your new class with a string of fake code to make sure it works. In this exercise, you ll actually implement the interface that you derived earlier, although your code doesn t need to do anything more than say that it s converting the string. The string we used in Run( ) is just dummy text representing a string of VB code. In Run( ), we pass the string to the ConvertToVB( ) method, and then pass it back to the ConvertToCSharp( ) method. Example A-35 shows the way we did it.

To understand the role of the bu er manager, consider a simple example Suppose that the database contains 1,000,000 pages, but only 1,000 pages of main memory are available for holding data Consider a query that requires a scan of the entire le Because all the data cannot be brought into main memory at one time, the DBMS must bring pages into main memory as they are needed and, in the process, decide what existing page in main memory to replace to make space for the new page The policy used to decide which page to replace is called the replacement policy In terms of the DBMS architecture presented in Section 18, the bu er manager is the software layer that is responsible for bringing pages from disk to main memory as needed The bu er manager manages the available main memory by partitioning it into a collection of pages, which we collectively refer to as the bu er pool The main memory pages in the bu er pool are called frames; it is convenient to think of them as slots that can hold a page (that usually resides on disk or other secondary storage media) Higher levels of the DBMS code can be written without worrying about whether data pages are in memory or not; they ask the bu er manager for the page, and it is brought into a frame in the bu er pool if it is not already there Of course, the higher-level code that requests a page must also release the page when it is no longer needed, by informing the bu er manager, so that the frame containing the page can be reused The higher-level code must also inform the bu er manager if it modi es the requested page; the bu er manager then makes sure that the change is propagated to the copy of the page on disk Bu er management is illustrated in Figure 73.

Example 8-4

Example A-35. Our solution to Exercise 13-2

RECORD name : PACKED ARRAY(1 40) OF CHAR; sex : (Male,Female); day : 131; month : 112; year : 18002000; address : PACKED ARRAY(180) OF CHAR; CASE sex OF Male : (years military: 050); Female : (pregnancies, children: 020) END;

using using using using System; System.Collections.Generic; System.Linq; System.Text;

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