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Alibaba ACA-Developer Exam - Topic 7 Question 43 Discussion

What are the benefits of creating indexes on PolarDB? (Number of correct answers: 2)
A) Improve the query efficiency SELECT statements. and B) Improve the efficiency of DML operations such as UPDATE. and C) Improve the efficiency of DDL operations.
D) Reduce invalid data scanning.

Alibaba ACA-Developer Exam - Topic 7 Question 43 Discussion

Actual exam question for Alibaba's ACA-Developer exam
Question #: 43
Topic #: 7
[All ACA-Developer Questions]

What are the benefits of creating indexes on PolarDB? (Number of correct answers: 2)

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Suggested Answer: A, B, C

by Corinne at Jul 09, 2023, 07:29 PM

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Pansy
6 months ago
Wait, can indexes really improve DML that much?
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Vicky
7 months ago
D sounds right, less scanning is always good!
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Frank
7 months ago
C doesn't really apply to indexes, right?
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Renay
7 months ago
B is a bit misleading, though.
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Marion
7 months ago
A definitely helps with SELECT queries!
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Carlene
8 months ago
Reducing invalid data scanning sounds familiar, but I can't remember if that's a direct benefit of indexes. I hope I’m not confusing it with something else!
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Scarlet
8 months ago
I vaguely recall that indexes don't really help with DDL operations, but I could be mixing that up with something else we studied.
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Annamae
8 months ago
I'm not entirely sure about the DML operations, but I remember something about indexes speeding up updates. It feels like it could be right.
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Coral
8 months ago
I think creating indexes definitely helps with SELECT statements, right? That seems like a common benefit we discussed.
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Verda
8 months ago
Okay, let me break this down step-by-step. I think I can work this out.
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Helene
8 months ago
Okay, let me see here. The question is asking about the destination address for the MLDv2 general query. I'm pretty sure it's one of the IPv6 multicast addresses, but I'm not 100% sure which one. I'll have to review my notes on MLDv2 to make sure I get this right.
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Dean
8 months ago
Wait, I thought there could be more than one constructor in a Python class. I'll have to double-check that.
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Carolynn
1 year ago
Ooh, this is a tricky one. I'm going to guess A and C, because who doesn't love faster DDL ops? But I could be way off base here.
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Allene
12 months ago
User 3: I'm not sure, but I'll go with A and B just to mix it up.
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Leota
12 months ago
User 2: I agree, faster SELECT statements and DDL ops are always a plus.
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Janessa
1 year ago
User 1: I think A and C are correct.
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Aleta
1 year ago
I'm going to go with A and D. Reducing invalid data scans sounds like a nice perk of indexing.
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Lavonna
12 months ago
That's a good choice. Indexes can definitely help with those benefits.
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Terrilyn
1 year ago
D) Reduce invalid data scanning.
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Teresita
1 year ago
A) Improve the query efficiency SELECT statements.
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Rima
1 year ago
Haha, I bet the folks at PolarDB would say the benefits are 'polar' opposite of what we expect! But seriously, A and D are my picks.
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Xuan
12 months ago
It's important to consider both A and D when thinking about the benefits of indexes on PolarDB.
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Maile
1 year ago
Reducing invalid data scanning is also a great benefit of creating indexes.
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Cathern
1 year ago
I agree, creating indexes on PolarDB can really improve query efficiency.
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Rickie
1 year ago
I'm not sure about B - I thought indexes were mainly for improving read operations, not writes. But A and D definitely sound right.
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Margery
1 year ago
A and D seem like the clear winners here. Indexes are all about speeding up queries, so those make perfect sense.
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Ivan
1 year ago
So, creating indexes can make database operations faster overall.
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Scarlet
1 year ago
Yes, that's true. It can also improve the efficiency of DML operations like UPDATE.
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Ivan
1 year ago
I think creating indexes on PolarDB can improve query efficiency.
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Davida
1 year ago
I agree. It can also improve the efficiency of DML operations like UPDATE.
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Gussie
1 year ago
Yes, that's correct. Indexes help speed up SELECT statements.
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Reynalda
1 year ago
I think creating indexes on PolarDB can improve query efficiency.
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