Discussion
The ______ indexes are forced to store only record IDs in the data structure and require at least one additional I/O Operation to retrieve the actual record.
Answer: C
Correct answer: Un-clustered
In a clustered index the rows are held in index order, so reaching the index entry reaches the row. An un-clustered index stores only a pointer or record id, so a second access is needed to fetch the row itself.
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