Complete SAS Programming Guide - Learn SAS and Become a Data Ninja - Should You Use an Index?

The video tutorial discusses two main considerations for using an index: the size of the subset and the frequency of use. For large datasets, creating an index is beneficial if the subset needed is up to 15-20% of the total data. Beyond this, performance may degrade. Additionally, frequent use of an index makes it more cost-effective in terms of computing resources.

What is the first main consideration when deciding to use an index?

• The brand of the computer

• The color of the index

• The type of data

• The size of the subset

For a data set with 100,000 observations, what is the ideal maximum percentage of the subset for which creating an index is beneficial?

• 5%

• 10%

• 25%

• 15%

What happens to performance if the subset size exceeds 20%?

• Performance worsens

• Performance becomes unpredictable

• Performance remains the same

• Performance improves

What is the second main consideration for using an index?

• The size of the computer

• The type of data

• The frequency of use

• The color of the index

Why does frequent use of an index make it more cost-effective?

• It makes the data set more colorful

• It decreases the frequency of data updates

• It increases the size of the data set

• It reduces the need for computer resources