Introduction To Database Management System by Atul Kahate

By Atul Kahate

Designed particularly for a unmarried semester, first path on database structures, there are four features that differentiate our ebook from the remaining. simplicity - in most cases, the expertise of database platforms could be very obscure. There are

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Introduction To Database Management System

Designed particularly for a unmarried semester, first direction on database structures, there are four points that differentiate our booklet from the remainder. simplicity - usually, the expertise of database structures may be very obscure. There are

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Solution-. (a) Division method Select a prime number M close to 99, say 97. Then we calculate H{K) as follows: (i) H (3207) = 3207 mod 97 = Remainder of 3207/97 = 6 (ii) H (7147) = 7147 mod 97 = Remainder of 7147/97 = 66 (iii) H (2347) = 2347 mod 97 = Remainder of 2347/97 = 19 Thus, the addresses would be 6, 66, and 19 for these three records. (b) Mid-square method (i) K2 = 10284849 H {K) K = 3207 = Middle two digits of this = 84 2 (ii) K = 7147 K = 51079609 H {K) = Middle two digits of this = 79 2 (iii) K = 2347 K = 5508409 H (K) = Middle two digits of this = 08 Note that in the third case there are no middle digits.

11 for card number 971 (indicating that book number 971 is lost). In any case, the librarian must not remove the card. This is exactly what happens with sequential files on computer disks. When we want to remove a record from a sequential file, the file cannot crunch itself automatically. For example suppose that there are 1000 records in a file, each occupying 100 bytes. The file would occupy a total of 1,00,000 bytes on the disk. Now, suppose that we want to delete record number 971 for some reason.

Having File Systems 27 found them, look for each of these books in the author index and chains. Both schemes look equally good, but which one should we select? There is no fixed rule. We can either go for the first method, or the second. However, our choice could affect the time required to come up with an answer to the query. For instance, suppose there are 50 books by Philip Bailey in the library and only three of them are published by ACS Publications. In addition, ACS has published two other books not authored by Philip Bailey.

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