Q2: Assume that relation R(a,b,c,d,e) contains 5,000,000 records, where each data block of the relation holds 10 records. R is organized as a sorted file with secondary indexes. Assume that R.a is a candidate key for R, with values in the range 0 to 4,999,999, and that R is stored in R.a order from smaller to larger. For each of the following access methods indicate whether the method is applicable or not for each query listed below. In the case that the access method or algorithm is applicable estimate is cost in terms on number of block accesses. In the case where the algorithm in not applicable state the reason. Access method: (A) Access the sorted file for R directly (file scan). (B) Use a B+ tree index on attribute R.a. (C) Use a hash index on attribute R.a. Queries: 1. Oa<50,000 (R) 2. Oa=50,000(R) Present your answer in the form of a table. File scan oa<50,000(R) oa=50,000(R) B+-tree Linear hashing L L

Q2: Assume that relation R(a,b,c,d,e) contains 5,000,000 records, where each data block of the relation holds 10 records. R is organized as a sorted file with secondary indexes. Assume that R.a is a candidate key for R, with values in the range 0 to 4,999,999, and that R is stored in R.a order from smaller to larger. For each of the following access methods indicate whether the method is applicable or not for each query listed below. In the case that the access method or algorithm is applicable estimate is cost in terms on number of block accesses. In the case where the algorithm in not applicable state the reason. Access method: (A) Access the sorted file for R directly (file scan). (B) Use a B+ tree index on attribute R.a. (C) Use a hash index on attribute R.a. Queries: 1. Oa<50,000 (R) 2. Oa=50,000(R) Present your answer in the form of a table. File scan oa<50,000(R) oa=50,000(R) B+-tree Linear hashing L L

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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