Chapter 15: Problem 16

Develop cost functions for an algorithm that consists of two SELECTs, a JOIN, and a final PROJECT, in terms of the cost functions for the individual operations.

Short Answer

Expert verified

The total cost function for an algorithm constituted by two SELECT operations, a JOIN operation, and a PROJECT operation, given the individual operation costs are denoted by \( S \) , \( J \), and \( P \) respectively, is 'Total Cost' = 2*\( S \) + \( J \) + \( P \)

Step by step solution

Address the Cost of SELECT

SELECT operation is used to fetch data from a database. Let's denote the cost of a SELECT operation as \( S \). It should be noted that we have two SELECT operations in this exercise

Address Cost of JOIN

JOIN operation is used to combine rows from two or more tables. This operation is typically resource-intensive. Let's denote the cost of the JOIN operation as \( J \)

Address Cost of PROJECT

PROJECT operation is used to select the necessary fields without selecting all fields. Let's denote the cost of the PROJECT operation as \( P \)

Formulate Aggregate Cost Function

Now, assuming that these operations will be performed one after the other, and considering the number of each operation, the cost function for the entire procedure can be formulated as follows: 'Total Cost' = 2*\( S \) + \( J \) +\( P \)

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Develop cost functions for an algorithm that consists of two SELECTs, a JOIN, and a final PROJECT, in terms of the cost functions for the individual operations.

Short Answer

Step by step solution

Address the Cost of SELECT

Address Cost of JOIN

Address Cost of PROJECT

Formulate Aggregate Cost Function

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