By S. M. Deen (auth.)
ISBN-10: 0333371003
ISBN-13: 9780333371008
ISBN-10: 1349179582
ISBN-13: 9781349179589
ISBN-10: 3353373373
ISBN-13: 9783353373373
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Example text
But given an operating system, the user may not always have any control on bucket size. The most important of these factors - the address generation technique - is discussed below. Address generation involves the generation of the bucket address from a key value, and it is carried out in three steps. First all non-numeric characters of the keys are converted to numeric form, a convenient method being the replacement of letters A to Z by numbers 10 to 35. In the second step the numeric key values obtained from the first step are transformed into another set of numbers which is evenly distributed over the specified range.
Ii) Use a good overflow handling technique. 2). Instead of using the division technique with data compression, if we divide the records into groups defined by upper and lower keys, then we shall have an indexed sequential file. Some experts are reluctant to call the division technique a true hashing technique, as it produces a sequential, rather than a random, key distribution. Remainder We shall use the previous example of maximum of 1000 records, with 4 digits key values to be distributed over 50 buckets.
A PDA block maintains an additional entry showing the address of its first eOA block. The actual process can be illustrated by the following example. Suppose a PDA block, capable of holding 6 records has the following 5 records 18 Principles and Practice ofDatabase Systems The first IDA cylinder Cylinder Index Entries Independent Overflow Area Cyl inder index occupies part of the first cvl inder followed by IDA. 2 Indexed sequential file If in a subsequent run, records 4, 6 and 8 are inserted, the PDA block will be reorganised as and two eOA blocks will be allocated to this PDA block for records 8 and 10.
Principles and Practice of Database Systems by S. M. Deen (auth.)
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