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Question #:1
What is the purpose of the autovacuum parameter in PostgreSQL?
To manually run vacuum
To enable automatic vacuuming of tables
To compress database files
To backup data automatically
Answer: B
Question #:2
Which command in psql toggles between aligned and unaligned output mode?
Answer: A Question #:3
PostgreSQL supports SQL dump backup. You have configured a nightly backup of a database in plain SQL dump format. Due to database corruption, you need to restore your database using the SQL dump backup. Which of the following commands can be used to restore a SQL dump?
psql -f sqldumpfilename --all -d databasename -U username
psql -f sqldumpfilename --tuples -d databasename -U username
psql -f sqldumpfilename -1 -d databasename -U username
psql -f sqldumpfilename -quiet -d databasename -U username
Answer: C
Question #:4
In PostgreSQL 13, which command is used to switch your connection to a different database in psql?
\connect dbname
USE dbname;
SWITCH dbname; SET DATABASE dbname;
Answer: A
Question #:5
Autocommit occurs in which of the following situations?
All DML statements
All DDL statements
On DML and DDL statements
None of the above
Answer: B
Question #:6
In PostgreSQL, archiving can be enabled for hot backups. During recovery, all the archive logs can be played on the restored backup and Point-in-Time Recovery can be performed. Which of the following parameters directly influences Mean Time to Recovery and is also used to control the size of the WAL area?
wal_level
wal_size
checkpoint_timeout
max_wal_size
Answer: D
Question #:7
Which configuration parameter limits the total number of connections available for your database cluster?
log_connection
max_connections
tcp_keepalives_count
superuser_reserved_connection
Answer: B
Question #:8
You want to check the current value of the max_connections parameter. Which SQL command should you use?
SELECT max_connections; SHOW max_connections; GET max_connections; DISPLAY max_connections;
Answer: B
Question #:9
Which command displays the current search path in PostgreSQL?
SELECT search_path; SHOW search_path; GET search_path; \path
Answer: B
Question #:10
You want to allow up to 200 connected users in your PostgreSQL cluster. Which parameter should you modify in postgresql.conf?
max_users = 200
max_connections = 200
connection_limit = 200
max_clients = 200
Answer: B
A. B.
C.
D.
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