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11 When reorganizing a sequential le as described in Sec 3-2, it is possible that a newly inserted record on the transaction le is to be deleted by a later transaction entered in the log le What does this require when sorting the transactions and merging the les Draw the owchart for the merge process
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Consider again your initial le application from Exercise 1 of Chap 1 List the attributes you will need, and assign them to les Identify which attributes will require variable length elds Discuss if use of pile les or sequential les would be reasonable for some of the les you expect in your application List any objections the users would have if either method were chosen
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Chap 3
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Exercises
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Would periodic reorganization be acceptable for your application What would be a natural reorganization period Who would be responsible for assuring that reorganizations were done on a timely basis Compute the average fetch time for an indexed-sequential le where the over ow areas are placed on the same cylinder Assume over ow area is equal to 25% of the prime le and reorganizations when over ow area is 80% full Assume B = 2000, R = 100
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15 16 Programming lore advises that input should be sorted in descending order when doing batch updates of les which keep over ows in ascending ordered chains Why Quantify the e ect 17 Equation 3-53 contains a simpli cation that upper level indexes add 5% to the index storage space What does this say about the e ective fanout yef f
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Compare Eq 3-40a and Eq 3-41 for TN Why are they di erent Evaluate both equations for a n = 100 000 and o = 1000 and for b n = 100 000 and o = 50 000
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18 19 What type of indexed-sequential over ow processing would you chose (assuming you could) for the applications listed in Exercise 3-4
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Choose three out of the attributes shown for indexing a personnel le: name, age, sex, job, number dependents, salary of dependents, salary ; and explain why you chose them
Estimate the number of goal records obtained for a partial-match query on sex and job for 500 employees There are 20 job classi cations Give a speci c example of values for these attributes where you expect many more goal records than the average expected, and one where you expect fewer
Prepare a owchart for and compare the performance of a binary search through an index with the multilevel approach for indexed les
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Find a le system where you study or work or in the literature and determine the seven measures of performance (R, TF , TI , etc) for its organization
24 What is the di erence in an index reorganization performance if 2x bu ers can be allocated rather than just x
For the project started in Chap 1, select which les should be piles, sequential, indexed-sequential, or multiply indexed Evaluate the 7 performance parameters for each of those les, using values of the size parameters n, a, a , Ai , Vi appropriate for your application, and values of s, r, t for a reasonable storage device for that application For the project started in Chap 1, assume you are using fully indexed les Estimate the selectivity for all attributes, consider their usefulness, and decide which ones should be indexed You are designing an indexed le system for use on a personal computer A requirement is that, for 90% of the cases, the insertion of a record should be completed in 1 s To assure meeting this constraint you will limit the number
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