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Files not only are characterized by their size but are further distinguished by their organization Di erences in the organizations of les lead to great di erences in performance when storing and retrieving records The evaluation and comparison of le organizations is an important aspect of this book Six basic le organization types will be analyzed in detail in Chap 3, and Chap 4 will show some of the possible combinations and permutations of these basic le types A database often requires more than one type of le 1-1-3 Input-Output When reading or writing les, data is transferred between storage and memory devices of the computer system When reading input or writing output, data enters or leaves the computer system A database is concerned with the data which remains within the scope of the system Data which is written onto tapes, although the tapes are dismounted, securely stored, and later mounted and read again, can be part of the database Data which is taken out, made accessible for modi cation, and reentered has to be considered new input, since its consistency is not assured

DATA AREA rid = (i,N)

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Examples of devices used for les are nonremovable disks and drums, removable disks that are normally kept mounted, dismountable master tapes or disks kept at the computer site, archival tapes and disks kept in remote vaults for protection, and some times card decks containing master lists that are loaded into the system when needed

The EndsWith( ) method asks a string whether a substring is found at the end of the string. Thus, you might first ask whether s3 ends with the word Training (which it does not), and then whether it ends with the word Consulting (which it does):

Devices used for input and output are terminals and all those machines that read or write media as cards, paper tape, printed reports, micro lm output, and tapes or disks that are shipped between computer systems

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Console.WriteLine("s3:{0}\nEnds with Training : {1}\n", s3, s3.EndsWith("Training") ); Console.WriteLine( "Ends with Consulting : {0}", s3.EndsWith("Consulting"));

In many computer systems the distinction of les versus input and output is not clearly delineated The subject of input and output is at best as complex as the database area and will not be covered in this text We will simply assume that an operating system is available which provides adequate input and output capabilities, including access via on-line terminals where appropriate, when we talk about database systems We will not discuss le organizations that are based on input and output facilities These tend to regard data as a continuous stream of characters Stream les,

The output reflects that the first test fails and the second succeeds:

Sec 1-2

The IndexOf( ) method locates a substring within a string, and the Insert( ) method inserts a new substring into a copy of the original string. The following code locates the first occurrence of Training in s3:

rid = (i,2) Record with rid = (i,1)

as de ned by PL/1, and their equivalents in other systems, are based on the reading and writing of continuous lines of text Continuous text streams are important for communication but are not suitable for data manipulation The word le will also not be used to refer to the hardware used to store the data comprising the les

Console.WriteLine("\nThe first occurrence of Training "); Console.WriteLine ("in s3 is {0}\n", s3.IndexOf("Training"));

In the rst section we considered some of the static aspects of a database, namely, the storage of data as les, records, and elds We now will look at a database from a dynamic point of view The dynamic behavior of programming structures has been studied whenever operating systems have been analyzed The terminology used in this chapter follows Tsichritzis74 The term computation is used to denote a section of an application which manipulates the database Most of the computations which are used to manipulate a data collection are conceptually simple We recognize four kinds of computations related to databases:

The output indicates that the offset is 71:

1 2 3 4

Then use that value to insert the word excellent, followed by a space, into that string. Actually, the insertion is into a copy of the string returned by the Insert( ) method and assigned to s10:

The building of the data collection Updating of data elements in the data collection Retrieval of data from the data collection Reduction of large quantities of data to usable form

string s10 = s3.Insert(71,"excellent "); Console.WriteLine("s10: {0}\n",s10);

20 N

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