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Latest PostgreSQL Essentials Exam Practice Questions

The practice questions for PostgreSQL Essentials exam was last updated on 2025-11-20 .

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Question#1

You want to update statistics for the emp and dept tables to help the query planner.
Which command should you use?

A. VACUUM emp, dept;

B. ANALYZE emp; ANALYZE dept;

C. UPDATE STATISTICS emp, dept;

D. REINDEX emp, dept;

Which psql command displays the command history?

A. \h

B. \s

C. \history

D. \log

Which parameter specifies the number of connections reserved for superusers in PostgreSQL?

A. reserved_connections

B. superuser_reserved_connections

C. admin_connections

D. max_superuser_connections

Which parameter sets the number of autovacuum worker processes?

A. autovacuum_workers

B. autovacuum_max_workers

C. max_autovacuum_workers

D. vacuum_workers

In PostgreSQL 13, what is the difference between GENERATED ALWAYS AS IDENTITY and GENERATED BY DEFAULT AS IDENTITY?

A. ALWAYS prevents manual value insertion, BY DEFAULT allows it

B. They are identical

C. ALWAYS uses UUID, BY DEFAULT uses serial

D. BY DEFAULT prevents manual insertion

Exam Code: PostgreSQL EssentialsQ & A: 71 Q&AsUpdated: 2025-11-20