PostgreSQL Certification Practice Test

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Quizzes Created: 7097 | Total Attempts: 80,150
| Questions: 15 | Updated: Jul 15, 2026
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1. Which isolation level in PostgreSQL prevents dirty reads, non-repeatable reads, and phantom reads?

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About This Quiz
Postgresql Certification Practice Test - Quiz

Test your PostgreSQL knowledge with this college-level certification practice quiz. Covering core database concepts, SQL operations, indexing, transactions, and performance optimization, this quiz prepares you for professional PostgreSQL certifications. Ideal for database administrators and developers seeking to validate their expertise.

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2. What does MVCC stand for in PostgreSQL?

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3. In PostgreSQL, which type of index is best for range queries?

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4. What is the primary purpose of the PostgreSQL WAL (Write-Ahead Logging)?

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5. Which command is used to create a new database in PostgreSQL?

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6. What does ACID stand for in database transactions?

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7. In PostgreSQL, which statement rolls back uncommitted changes in a transaction?

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8. What is the default port number for PostgreSQL?

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9. Which PostgreSQL feature allows you to define custom data types?

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10. In PostgreSQL, what does a foreign key constraint ensure?

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11. PostgreSQL uses which type of replication for high availability?

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12. Which command displays the query execution plan in PostgreSQL?

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13. In PostgreSQL, what is a schema?

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14. PostgreSQL supports which of the following join types?

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15. Which PostgreSQL feature allows automatic execution of database operations in response to events?

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Which isolation level in PostgreSQL prevents dirty reads,...
What does MVCC stand for in PostgreSQL?
In PostgreSQL, which type of index is best for range queries?
What is the primary purpose of the PostgreSQL WAL (Write-Ahead...
Which command is used to create a new database in PostgreSQL?
What does ACID stand for in database transactions?
In PostgreSQL, which statement rolls back uncommitted changes in a...
What is the default port number for PostgreSQL?
Which PostgreSQL feature allows you to define custom data types?
In PostgreSQL, what does a foreign key constraint ensure?
PostgreSQL uses which type of replication for high availability?
Which command displays the query execution plan in PostgreSQL?
In PostgreSQL, what is a schema?
PostgreSQL supports which of the following join types?
Which PostgreSQL feature allows automatic execution of database...
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