Alibaba Exam ACA-Operator Topic 6 Question 55 Discussion

Actual exam question for Alibaba's ACA System Operator Certification exam

Question #: 55
Topic #: 6

[All ACA System Operator Certification 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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France

1 days ago

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

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Hyman

2 days 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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