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Snowflake COF-C02 Exam - Topic 3 Question 60 Discussion

What happens to the underlying table data when a CLUSTER BY clause is added to a Snowflake table?
D) Data may be colocated by the cluster key within the micro-partitions to improve pruning performance
A) Data is hashed by the cluster key to facilitate fast searches for common data values
B) Larger micro-partitions are created for common data values to reduce the number of partitions that must be scanned
C) Smaller micro-partitions are created for common data values to allow for more parallelism

Snowflake COF-C02 Exam - Topic 3 Question 60 Discussion

Actual exam question for Snowflake's COF-C02 exam
Question #: 60
Topic #: 3
[All COF-C02 Questions]

What happens to the underlying table data when a CLUSTER BY clause is added to a Snowflake table?

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Suggested Answer: D

When aCLUSTER BYclause is added to a Snowflake table, it specifies one or more columns to organize the data within the table's micro-partitions. This clustering aims to colocate data with similar values in the same or adjacent micro-partitions. By doing so, it enhances the efficiency of query pruning, where the Snowflake query optimizer can skip over irrelevant micro-partitions that do not contain the data relevant to the query, thereby improving performance.

References:

Snowflake Documentation on Clustering Keys & Clustered Tables1.

Community discussions on how source data's ordering affects a table with a cluster key


by Merilyn at Aug 19, 2025, 12:48 AM

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Lenna
6 months ago
Wait, are we sure about B? Larger micro-partitions?
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Glenn
7 months ago
I think D makes more sense for pruning performance.
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Noe
7 months ago
A is correct! It helps with faster searches.
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Lili
7 months ago
Totally agree with D, colocating data is key!
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Celeste
8 months ago
I thought clustering just reorganized data, not hashed it.
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Fausto
8 months ago
I believe that clustering can help reduce the number of partitions scanned, so maybe option B is correct, but I’m not entirely confident.
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Ryan
8 months ago
I practiced a similar question, and I feel like the hashing aspect is important, but I can't recall if that's the main effect of CLUSTER BY.
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Kiley
8 months ago
I remember something about how data is colocated by the cluster key, which improves pruning performance. That sounds like option D to me.
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Billy
8 months ago
I think the CLUSTER BY clause helps with data organization, but I'm not sure if it actually creates larger or smaller micro-partitions.
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Pearlie
9 months ago
The CLUSTER BY clause is all about optimizing the micro-partitions, so I'm guessing it's either option B or C. I'll need to think through the tradeoffs a bit more to decide.
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Karl
9 months ago
I'm pretty confident that the CLUSTER BY clause is about hashing the data to facilitate faster searches. I think option A is the right answer here.
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Danica
9 months ago
Based on the options, it seems like the CLUSTER BY clause helps with data pruning and parallelism. I'm leaning towards option D, since that sounds the most relevant.
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Emeline
9 months ago
Hmm, I'm a bit confused on the exact impact of the CLUSTER BY clause. Is it just about creating larger or smaller micro-partitions, or is there more to it?
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Ozell
9 months ago
I think the key here is understanding how Snowflake's micro-partitioning works. The CLUSTER BY clause should help group common data values together to improve query performance.
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Tawna
10 months ago
I see your point, Brandee. Colocating data by the cluster key could indeed improve performance.
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Brandee
10 months ago
I believe the answer is D) Data may be colocated by the cluster key within the micro-partitions to improve pruning performance.
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Edgar
10 months ago
Option D sounds the most accurate to me. Clustering the data by the key should help optimize pruning during query execution.
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Quinn
6 months ago
True, but D really focuses on optimizing queries.
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Elli
6 months ago
I think option A is also valid. Fast searches are important too.
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Leota
7 months ago
Yeah, colocating data should help with pruning.
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Cordelia
7 months ago
I agree, option D seems right. It makes sense for performance.
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Bettye
11 months ago
I agree with Vincenza, hashing the data by the cluster key makes sense for faster searches.
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Vincenza
11 months ago
I think the answer is A) Data is hashed by the cluster key to facilitate fast searches for common data values.
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