ClickHouse Certified Practice Questions - ClickHouse Certified Developer Exam - ClickHouse Certified Practice Questions

Question 1

Which storage model does ClickHouse use to achieve high analytical query performance on large datasets?

Row-oriented storage with B-tree indexes Columnar storage with vectorized execution Document storage with JSON compression Wide-column storage with LSM trees

Correct Answer:

Columnar storage with vectorized execution

Question 2

In ClickHouse, what is a 'granule' in the context of MergeTree storage?

A single row in a MergeTree data part A block of rows (default 8,192) that forms the unit of index granularity A compressed block of 65,536 rows written to disk at once A shard partition containing data for one server

Correct Answer:

A block of rows (default 8,192) that forms the unit of index granularity

Question 3

What is the relationship between the ORDER BY clause and the PRIMARY KEY in a MergeTree table when PRIMARY KEY is not explicitly specified?

The primary key defaults to the first column regardless of ORDER BY The primary key is automatically set equal to the ORDER BY expression A table without an explicit PRIMARY KEY has no sparse index PRIMARY KEY must always be specified separately from ORDER BY

Correct Answer:

The primary key is automatically set equal to the ORDER BY expression

Question 4

A MergeTree table is defined with ORDER BY (tenant_id, event_date, user_id). A query filters only on user_id. What does ClickHouse do with the primary index for this query?

Uses the primary index efficiently since user_id is part of the key Cannot use the primary index at all because user_id is not the first key column Automatically reorders the index to match the query filter Performs a hash join against the index to find matching user_ids

Correct Answer:

Cannot use the primary index at all because user_id is not the first key column

Question 5

What is the purpose of PARTITION BY in a MergeTree table?

It defines the sort order of data within each data part It splits data into separate directories, enabling partition pruning for WHERE filters It determines which shard a row is routed to in a distributed cluster It sets the primary key prefix used for the sparse index

Correct Answer:

It splits data into separate directories, enabling partition pruning for WHERE filters

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About this Exam

Prepare with the ClickHouse Certified Practice Questions - ClickHouse Certified Developer Exam practice quiz. This question bank includes 100 questions covering clickhouse, table, data, query, and mergetree. Use it to review important concepts, identify knowledge gaps, and build confidence for the related exam, course, or assessment.

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ClickHouse Certified Practice Questions - ClickHouse Certified Developer Exam

This practice set contains 100 questions from the matching question bank and focuses on clickhouse, table, data, query, and mergetree. Work through each question carefully, review the provided solutions, and revisit topics that need more study before your next attempt.

This is an independent study resource intended for practice and review; it is not an official examination or an endorsement by any organization named in the title.

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ClickHouse Certified Practice Questions - ClickHouse Certified Developer Exam

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