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NEW QUESTION # 48
What is the purpose of the autovacuum parameter in PostgreSQL?
- A. To backup data automatically
- B. To manually run vacuum
- C. To enable automatic vacuuming of tables
- D. To compress database files
Answer: C
NEW QUESTION # 49
Which of the following commands in psql will execute SQL commands from a file?
- A. \e filename
- B. \i filename
- C. \f filename
- D. \x filename
Answer: B
NEW QUESTION # 50
You want to export query results to a CSV file from psql. Which command should you use?
- A. EXPORT TO 'filename.csv'
- B. \copy tablename TO 'filename.csv' CSV
- C. SAVE AS 'filename.csv'
- D. \export filename.csv
Answer: B
NEW QUESTION # 51
Which configuration file controls client authentication in PostgreSQL?
- A. postgresql.conf
- B. auth.conf
- C. pg_hba.conf
- D. pg_ident.conf
Answer: C
NEW QUESTION # 52
You need to reload the PostgreSQL configuration without restarting the server. Which function should you use?
- A. pg_restart_conf()
- B. refresh_config()
- C. reload_configuration()
- D. pg_reload_conf()
Answer: D
NEW QUESTION # 53
Which parameter sets the number of autovacuum worker processes?
- A. max_autovacuum_workers
- B. autovacuum_workers
- C. autovacuum_max_workers
- D. vacuum_workers
Answer: C
NEW QUESTION # 54
You want to list all available databases in your PostgreSQL cluster using psql. Which command should you use?
- A. \list
- B. SHOW DATABASES;
- C. \l
- D. SELECT databases();
Answer: C
NEW QUESTION # 55
You want to view all available functions in the current database using psql. Which command should you use?
- A. \df
- B. \fn
- C. \f
- D. \functions
Answer: A
NEW QUESTION # 56
You want to export the emp table to a CSV file with column headers using the COPY command. Which command should you use?
- A. COPY emp TO '/path/emp.csv' WITH CSV;
- B. COPY emp TO '/path/emp.csv' WITH CSV HEADER;
- C. EXPORT emp TO '/path/emp.csv' CSV HEADER;
- D. COPY emp TO '/path/emp.csv' DELIMITER ',' HEADER;
Answer: B
NEW QUESTION # 57
You are writing an initialization script to help your team in creating a new database cluster. You want to ensure that a new database cluster is initialized with md5 as the default authentication method. Which of the following options of the initdb command can be used to specify the default authentication method?
- A. -U
- B. -authenticate
- C. -A
- D. -db-auth
Answer: C
NEW QUESTION # 58
Which command displays the current search path in PostgreSQL?
- A. GET search_path;
- B. \path
- C. SELECT search_path;
- D. SHOW search_path;
Answer: D
NEW QUESTION # 59
Which psql meta-command is used to display all roles and their attributes?
- A. \du
- B. \dr
- C. \users
- D. \roles
Answer: A
NEW QUESTION # 60
You want to set temporary memory to 8MB. Which parameter should you configure?
- A. temp_memory = 8MB
- B. work_mem = 8MB
- C. temp_buffers = 8MB
- D. temporary_memory = 8MB
Answer: C
NEW QUESTION # 61
In PostgreSQL 13, which command is used to switch your connection to a different database in psql?
- A. USE dbname;
- B. SWITCH dbname;
- C. SET DATABASE dbname;
- D. \connect dbname
Answer: D
NEW QUESTION # 62
SERIAL and IDENTITY columns can be used to add an auto-incrementing column in a Postgres table. Which of these two column types are SQL standard compliant?
- A. None
- B. Serial
- C. Identity
Answer: C
NEW QUESTION # 63
You need to restore only the schema from a custom format backup file. Which pg_restore option should you use?
- A. --schema-only
- B. Both B and C
- C. -s
- D. --data-only
Answer: B
NEW QUESTION # 64
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