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What is the purpose of index in SQL Server MCQ?

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5 months 2 weeks ago#3338by Elias
What is the purpose of index in SQL Server MCQ?
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5 months 2 weeks ago - 5 months 2 weeks ago#3339by Elias
A database index is a data structure that improves the speed of data retrieval operations on a database table at the cost of additional writes. (google)

This is not all. From Oracle I know that if you want a full table scan or above 70% the index delay the retrieval.

If less is ok.In general we use index to find the proper record(s) that must manage (update,delete,view), and in many cases this become faster with index.
Last edit: 5 months 2 weeks ago by Elias.
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