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Alibaba Exam ACA-Operator Topic 6 Question 55 Discussion

Actual exam question for Alibaba's ACA-Operator exam

Question #: 55
Topic #: 6

[All ACA-Operator Questions]

When you use SQL statements to access tables in a database without an index configured, a full table scan will be performed. If a table contains a large amount of data, this kind of scan will access a large amount of data and consume a lot of the database's resources. Which of the following options are best practices when creating database indexes? (Number of correct answers: 3)

AAdd an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

BApplies indices to fields to contain many records.

CA table should not contaiiAiore than 6 indexed fields.

DApply indexing to fields of fixed length (preferably not long fields).

EAdhere to the rightmost prefix principle when using composite indexes

Show Suggested Answer

Suggested Answer: A, C, D

by Eladia at Mar 16, 2024, 02:09 PM

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Mammie

7 months ago

Definitely, it can improve query optimization by using the correct index order.

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Jolene

7 months ago

I've heard that adhering to the rightmost prefix principle when using composite indexes is a good practice too.

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Isreal

7 months ago

That makes sense, it can speed up data retrieval.

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Luis

7 months ago

I believe applying indices to fields with many records can also be helpful.

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Mammie

8 months ago

Yes, that can definitely improve query performance.

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Isreal

8 months ago

I think adding an index to a field that is frequently queried is important.

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Lili

8 months ago

I think adding indexing to fields of fixed length can also be helpful in speeding up data retrieval.

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Reid

8 months ago

Yes, that's a good point. It helps in optimizing the search queries.

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Eladia

8 months ago

I believe we should also adhere to the rightmost prefix principle when using composite indexes.

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France

9 months ago

I agree with that. It will help improve the performance of the queries.

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Hyman

9 months ago

I think we should add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations.

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