PostgreSQL-Essentials EnterpriseDB PostgreSQL Essentials Certification v13 exact Exam Questions

PostgreSQL Essentials Certification v13

Last Update 20 hours ago Total Questions : 116

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Question # 11

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

Question # 12

You want to export query results to a CSV file from psql. Which command should you use?

\copy tablename TO ' filename.csv ' CSV

EXPORT TO ' filename.csv '

\export filename.csv

SAVE AS ' filename.csv '

Question # 13

You are connected to a PostgreSQL database. After executing a complex query an error message is displayed. You want to edit and rerun the previously executed query. Which command can be used to edit the query buffer?

Question # 14

In PostgreSQL 13, which parameter must be set to enable WAL archiving for Point-in-Time Recovery?

wal_level must be set to replica or higher

wal_archiving must be set to on

archive_level must be set to full

backup_mode must be set to archive

Question # 15

Examine the following SQL:

CREATE VIEW vw_emp_details AS SELECT ename, sal, sal*12 AS annsal FROM emp;

After creating the above view, what will be the result of the following query?

UPDATE vw_emp_details SET annsal = annsal + 100;

Error: Views cannot be updated

Error: Cannot update column annsal

Statement executes successfully but none of the rows of emp table are modified

Statement executes successfully and all the rows of emp table are modified

Question # 16

In PostgreSQL, which view provides information about currently running queries?

pg_stat_activity

pg_current_queries

pg_running_queries

pg_active_sessions

Question # 17

You are working as a Postgres DBA. Due to an increase in transactional load on your Postgres instance, the server is experiencing frequent checkpoints. You have decided to increase the WAL area size. You have also decided to upgrade your database instance to PostgreSQL 13. While initializing your database cluster in PostgreSQL 13, you have decided to increase the WAL segment size. Which of the following options can be used with the initdb command to set a custom WAL segment size?

=- waldir

--wal-segsize

-x

No such option is available in PostgreSQL