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Estimating block accesses in database organizations

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2 Author(s)
Diehr, G. ; Coll. of Bus. Adm., California State Univ., San Marcos, CA, USA ; Saharia, A.N.

The exact expression for the expected number of disk accesses required to retrieve a given number of records, called the Yao function, requires iterative computations. Several authors have developed approximations to the Yao function, all of which have substantial errors in some situations. We derive and evaluate simple upper and lower bounds that never differ by more than a small fraction of a disk access

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Knowledge and Data Engineering, IEEE Transactions on  (Volume:6 ,  Issue: 3 )