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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
2 months ago
I thought composite indexes were just a suggestion, not a rule?
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Osvaldo
2 months ago
Fixed length fields are definitely better for indexing.
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Linwood
2 months ago
Wait, are you saying more than 6 indexes is bad?
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Lonna
3 months ago
Totally agree, indexing is key for performance.
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Eden
3 months ago
Full table scans can really slow things down!
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Dean
3 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
3 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
4 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
4 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
4 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
4 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
4 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
5 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
5 months ago
This question seems straightforward, but I want to make sure I understand the key points before answering.
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