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Alibaba ACA-Operator Exam - Topic 4 Question 83 Discussion

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)
A) Add an index to a field that is frequently queried but does not frequently perform add, delete, or modify operations. and C) A table should not contaiiAiore than 6 indexed fields. and D) Apply indexing to fields of fixed length (preferably not long fields).
B) Applies indices to fields to contain many records.
E) Adhere to the rightmost prefix principle when using composite indexes

Alibaba ACA-Operator Exam - Topic 4 Question 83 Discussion

Actual exam question for Alibaba's ACA-Operator exam
Question #: 83
Topic #: 4
[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)

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Suggested Answer: A, C, D

by Isabelle at Apr 29, 2025, 06:56 AM

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Tatum
5 months ago
I thought composite indexes were just a suggestion, not a rule?
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Osvaldo
6 months ago
Fixed length fields are definitely better for indexing.
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Linwood
6 months ago
Wait, are you saying more than 6 indexes is bad?
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Lonna
6 months ago
Totally agree, indexing is key for performance.
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Eden
6 months ago
Full table scans can really slow things down!
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Dean
6 months ago
The rightmost prefix principle for composite indexes was mentioned in our last practice session, so I feel confident about option E being a good choice.
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Belen
7 months ago
I vaguely recall something about limiting the number of indexed fields, but I can't remember if it was 6 or a different number.
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Deandrea
7 months ago
I think option B sounds familiar, but I’m a bit confused about how many records are considered "many" for applying indices.
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Oliva
7 months ago
I remember we discussed that adding indexes to frequently queried fields is important, but I’m not sure if it’s the best practice for fields that change often.
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Alesia
7 months ago
I think I've got a good handle on this. The key is to add indexes to frequently queried fields, but avoid over-indexing the table.
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Karl
7 months ago
Hmm, I'm a bit unsure about the specifics here. I'll need to review my notes on indexing strategies to make sure I get this right.
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Devorah
8 months ago
Ah, I've seen this type of question before. The key is to focus on best practices for creating effective indexes.
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Malinda
8 months ago
Okay, let me think this through. I know that indexes can improve query performance, but I need to be careful about how I use them.
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Altha
8 months ago
This question seems straightforward, but I want to make sure I understand the key points before answering.
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