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MongoDB C100DBA Exam - Topic 6 Question 117 Discussion

Actual exam question for MongoDB's C100DBA exam
Question #: 117
Topic #: 6
[All C100DBA Questions]

What does the following query do when performed on the posts collection? db.posts.update({_id:l},{Title:This is post with ID 1"})

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Suggested Answer: B

by Shawna at Nov 24, 2025, 11:24 AM

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Sheridan
10 hours ago
Definitely not a full document replacement.
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Jettie
6 days ago
I think it just updates the Title, right?
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Lourdes
11 days ago
I'd rather update my resume than try to figure out this MongoDB query.
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Nobuko
16 days ago
This query is like a surgeon trying to perform heart surgery with a butter knife.
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Chery
21 days ago
D) Updating a document is possible only with $set
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Josphine
26 days ago
B) Replaces the complete document with _id as 1 with the document specified in second parameter
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James
1 month ago
C) Updates the Title of the post
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Argelia
1 month ago
I feel like I read that you can only update documents using $set, but I’m not sure if that applies here.
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Bette
1 month ago
I practiced a similar question, and I think it’s supposed to update the Title of the post, but I’m not completely confident.
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Jamal
2 months ago
I remember something about the update method, but I’m not sure if it replaces the whole document or just updates a field.
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Lashawna
2 months ago
I think the key here is that the query is using the update() method without the $set operator. Based on that, my guess is that option B is correct - it replaces the entire document with the _id of 1 with the new document specified in the second parameter.
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Idella
2 months ago
I'm a bit confused by this one. The question mentions the posts collection, but the query doesn't have a filter to select a specific document. And the second parameter doesn't look like the normal update syntax. I'm going to have to review my notes on MongoDB update operations before answering this.
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Meaghan
2 months ago
I think this query might have a syntax error because of the missing quotation marks around the title.
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Lorean
3 months ago
That's a syntax error for sure.
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Verlene
3 months ago
Okay, let me see. The query is using the update() method, so it's definitely an update operation. But the second parameter doesn't look like the typical $set format. I'm going to go with option C and say it updates the Title field.
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Gerald
3 months ago
Hmm, I'm not sure about this one. The question says it's updating the posts collection, but the query doesn't have the $set operator that I thought was required for updates. I'll have to think this through carefully.
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Simona
3 months ago
I think this query is updating the Title field of the document with the _id of 1. The second parameter looks like it's specifying the new Title value.
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Veronika
2 months ago
Yeah, the second parameter is clearly a new Title.
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Clorinda
2 months ago
I agree, it seems like it's just updating the Title.
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