Alibaba Exam ACA-Operator Topic 3 Question 62 Discussion

Actual exam question for Alibaba's ACA-Operator exam

Question #: 62
Topic #: 3

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 Lashawn at Jun 19, 2024, 11:41 AM

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Jeniffer

5 months ago

B? Are you kidding me? That's like saying the more records you have, the more indexes you should add. It's like trying to organize a messy room by buying more shelves - it's just gonna make it worse!

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Kanisha

5 months ago

Definitely A, D, and E. Indexing is the secret sauce of databases, but like any good sauce, you don't want to drown the whole dish in it. Moderation is key!

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6 months ago

A, D, and E. Indexing improves query performance, but too many indexes can slow down write operations. Gotta strike the right balance!

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Malcom

5 months ago

Yes, too many indexes can definitely slow down write operations. It's all about finding the right balance.

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Delsie

5 months ago

A, D, and E are the correct options. Indexing is important for query performance.

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Dewitt

6 months ago

I think option A is a good practice because it helps improve query performance without impacting data modification operations.

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