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Non-Clustered Indexes and Performance Quiz

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Non-Clustered Indexes and Performance Quiz

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Questions and Answers

What type of index contains the physical locations of the rows in the table?

Filtered index

Clustered index

Non-clustered index (correct)

Include index

In what form does the base data exist if a non-clustered index is separate from it?

B-tree

Hash table

Sorted array

Heap (correct)

What does a filtered index contain?

Rows that meet a user-defined predicate (correct)

Only key column values

Non-key column values

All rows in the table

Which type of index can contain copies of non-key column values at the leaf level of the index tree?

Include index Signup and view all the answers

What happens if values from columns not in the non-clustered index are requested?

The query uses the clustered index Signup and view all the answers

Can a clustered index be filtered?

No, it has to contain all the data in the table Signup and view all the answers

What is the purpose of a clustered index?

To represent the base data as a whole in a specific order Signup and view all the answers

Why might a non-clustered index take longer for a query on Employee2 compared to Employee1?

Employee2 is a physically separate structure with different sort order Signup and view all the answers

What is the drawback of using indexes?

Indexes consume additional storage space Signup and view all the answers

What is the advantage of using a clustered index?

Fast access through a tree structure Signup and view all the answers

Why might indexes slow down updates, deletes, and inserts?

They have to be updated along with the data Signup and view all the answers

What is the purpose of INCLUDE columns in an index?

To speed up data retrieval for specific columns in queries Signup and view all the answers