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MongoDB C100DBA Exam - Topic 1 Question 36 Discussion

If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?
B) The query used an index to fetch the results
A) None of the above
C) The query returned 0 documents
D) The query returned 30000 documents after scanning the documents

MongoDB C100DBA Exam - Topic 1 Question 36 Discussion

Actual exam question for MongoDB's C100DBA exam
Question #: 36
Topic #: 1
[All C100DBA Questions]

If the value of totalKeysExamined is 30000 and the value of totalDocsExamined is 0, which of the following option is correct?

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Suggested Answer: B

by Lili at May 06, 2022, 12:00 AM

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Mireya
8 months ago
Sounds like a trick question to me!
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Junita
9 months ago
I agree, it has to be B.
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Carmelina
9 months ago
Wait, how can totalKeysExamined be 30000 with 0 docs?
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Walton
9 months ago
Definitely B, using an index here!
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Stephaine
9 months ago
The query returned 0 documents.
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Geraldine
9 months ago
I feel like option C makes sense since if no documents were examined, then it likely returned zero results.
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Gayla
9 months ago
I'm not entirely sure, but I think if totalDocsExamined is 0, it means the query didn't return any documents at all.
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Dolores
9 months ago
I remember something about totalKeysExamined being high while totalDocsExamined is zero indicating an index was used.
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Mozell
9 months ago
I practiced a similar question where a high number of keys examined meant the query was efficient, but I can't recall the exact details.
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Brendan
9 months ago
Ah, I know this one! The property setting to automatically increase the deployment version is "Increment Deployment Version". I'm confident that's the right answer.
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Sarina
9 months ago
Hmm, I'm a little unsure on this one. I know there are different types of financial analysis, but I can't quite remember the specific term for comparing year-over-year changes. I'll have to think this through carefully.
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Tiffiny
9 months ago
Hmm, I'm a bit unsure about this one. I know measures of central tendency have to do with describing the typical or average value in a data set, but I'm not totally clear on the differences between the options. I'll have to think this through carefully.
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