Free DBT Performance Optimization Questions and Answers

Question 1

Which dbt materialization type reduces query execution time by persisting data in tables rather than views?

Accepted Answer

Table

Answer

View

Answer

Ephemeral

Answer

Seed

Question 2

What is a primary advantage of incremental models in dbt for performance optimization?

Accepted Answer

Update only new or modified records

Answer

Run entire dataset each time

Answer

Skip model compilation

Answer

Disable logging

Question 3

Which SQL technique improves performance by reducing the size of result sets before joins?

Accepted Answer

Filter rows before joins

Answer

Avoid WHERE clauses

Answer

Use SELECT * in subqueries

Answer

Remove indexes

Question 4

Why is using CTEs (Common Table Expressions) beneficial for query performance and maintenance?

Accepted Answer

Organizes complex queries and aids optimization

Answer

Increases runtime significantly

Answer

Requires more hardware resources

Answer

Disables indexes

Question 5

Which configuration parameter can adjust query concurrency limits in dbt Cloud runs?

Accepted Answer

Threads

Answer

Models directory

Answer

Seeds config

Answer

Warehouse size

Question 6

What does the 'persist_docs' setting do in dbt to optimize project documentation management?

Accepted Answer

Persists documentation metadata in the warehouse

Answer

Deletes logs

Answer

Removes ephemeral models

Answer

Increases incremental run frequency

Question 7

Which dbt command can be used to preview model SQL performance by compiling models without executing them?

Accepted Answer

dbt compile

Answer

dbt run

Answer

dbt test

Answer

dbt docs generate

Question 8

Which practice improves incremental model performance by avoiding unnecessary comparisons?

Accepted Answer

Use a unique_key in incremental config

Answer

Disable WHERE filters

Answer

Create redundant CTEs

Answer

Run all models in full-refresh mode

Question 9

Why should 'SELECT *' be avoided in dbt models for performance?

Accepted Answer

Because it retrieves unnecessary columns

Answer

Because it's faster

Answer

Because it disables filters

Answer

Because it increases logging