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Free PostgreSQL-Essentials Exam Braindumps
PostgreSQL Essentials Certification v13 Questions 26–30 (page: 7)

Updated On: 10-Feb-2026

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QUESTION: 26

What is the purpose of shared_buffers configuration parameter in PostgreSQL?

To set the amount of memory for sorting
To determine memory for caching data from disk
To control WAL buffer size
To set connection pool size

Answer(s): B

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QUESTION: 27

Which command in psql toggles between aligned and unaligned output mode?

\a
\t
\align
\format

Answer(s): A

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QUESTION: 28

You need to reload the PostgreSQL configuration without restarting the server.
Which function should you use?

pg_restart_conf()
pg_reload_conf()
reload_configuration()
refresh_config()

Answer(s): B

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QUESTION: 29

Which psql meta-command lists all schemas in the current database?

\ds
\dn
\schemas
\ls

Answer(s): B

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QUESTION: 30

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

ALWAYS prevents manual value insertion, BY DEFAULT allows it
They are identical
ALWAYS uses UUID, BY DEFAULT uses serial
BY DEFAULT prevents manual insertion

Answer(s): A

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