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Question 584 - COF-C02 discussion

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What is the MINIMUM size of a table for which Snowflake recommends considering adding a clustering key?

A.
1 Kilobyte (KB)
Answers
A.
1 Kilobyte (KB)
B.
1 Megabyte (MB)
Answers
B.
1 Megabyte (MB)
C.
1 Gigabyte (GB)
Answers
C.
1 Gigabyte (GB)
D.
1 Terabyte (TB)
Answers
D.
1 Terabyte (TB)
Suggested answer: D

Explanation:

Snowflake recommends considering adding a clustering key to a table when its size reaches 1 Terabyte (TB) or larger. Clustering keys help optimize the storage and query performance by organizing the data in a table based on the specified columns. This is particularly beneficial for large tables where data retrieval can become inefficient without proper clustering.

Why Clustering Keys Are Important: Clustering keys ensure that data stored in Snowflake is physically ordered in a way that aligns with the most frequent access patterns, thereby reducing the amount of scanned data during queries and improving performance.

Recommendation Basis: The recommendation for tables of size 1 TB or larger is based on the observation that smaller tables generally do not benefit as much from clustering, given Snowflake's architecture. However, as tables grow in size, the benefits of clustering become more pronounced.

Implementing Clustering Keys:

To set a clustering key for a table, you can use the CLUSTER BY clause during table creation or alter an existing table to add it:

CREATE TABLE my_table (... ) CLUSTER BY (column1, column2);

Or for an existing table:

ALTER TABLE my_table CLUSTER BY (column1, column2);

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asked 23/09/2024
Shaharyar Chaudhry
42 questions
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