Consider a relation R, with attributes X, y, and z. Suppose that there is an unclustered B+ tree index on the composite key and we want to evaluate the following SQL query: SELECT x, y FROM R WHERE x >=20 Explain whether it is possible to use an index-only plan to evaluate the query if our DBMS supports index-only plans? Consider a relation R, with attributes x, y, and z. Suppose that there is anunclustered B+ tree index on the composite key and we want toevaluate the following SQL query:SELECT x, y FROM R WHERE x >= 20Explain whether it is possible to use an index-only plan to evaluate thequery if our DBMS supports index-only plans?

Introduction=====> used to implement db indexes =>in B+ tree leaf nodes denotes actal data…

Answered: Consider a relation R, with attributes…

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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Consider a relation R, with attributes X, y, and z. Suppose that there is an unclustered B+ tree index on the composite key and we want to evaluate the following SQL query: SELECT x, y FROM R WHERE x >=20 Explain whether it is possible to use an index-only plan to evaluate the query if our DBMS supports index-only plans?

Consider a relation R, with attributes x, y, and z. Suppose that there is an
unclustered B+ tree index on the composite key <x, y> and we want to
evaluate the following SQL query:
SELECT x, y FROM R WHERE x >= 20
Explain whether it is possible to use an index-only plan to evaluate the
query if our DBMS supports index-only plans?

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