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EnterpriseDB PostgreSQL-Essentials Exam Syllabus Topics:
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NEW QUESTION # 40
Which psql meta-command lists all schemas in the current database?
- A. \ds
- B. \ls
- C. \dn
- D. \schemas
Answer: C
NEW QUESTION # 41
You need to restore a database from a compressed format backup file created with pg_dump -Fc option.
Which utility should you use?
- A. psql
- B. pg_basebackup
- C. pg_dump
- D. pg_restore
Answer: D
NEW QUESTION # 42
You need to reclaim storage occupied by dead tuples in the customers table. Which command should you use?
- A. ANALYZE customers;
- B. CLUSTER customers;
- C. VACUUM customers;
- D. REINDEX customers;
Answer: C
NEW QUESTION # 43
Which command rebuilds an index that is performing slowly for better performance?
- A. ANALYZE INDEX indexname;
- B. VACUUM INDEX indexname;
- C. REINDEX INDEX indexname;
- D. REBUILD INDEX indexname;
Answer: C
NEW QUESTION # 44
Which parameter controls the amount of memory allocated for maintenance operations like VACUUM and CREATE INDEX?
- A. work_mem
- B. temp_buffers
- C. maintenance_work_mem
- D. vacuum_mem
Answer: C
NEW QUESTION # 45
You want to list all available databases in your PostgreSQL cluster using psql. Which command should you use?
- A. SELECT databases();
- B. \l
- C. \list
- D. SHOW DATABASES;
Answer: B
NEW QUESTION # 46
You want to gracefully terminate a user's connection to the database. Which function should you use?
- A. pg_disconnect_backend(pid)
- B. pg_kill_backend(pid)
- C. pg_terminate_backend(pid)
- D. pg_cancel_backend(pid)
Answer: C
NEW QUESTION # 47
Which command can be used to display all roles and their attributes in PostgreSQL using psql?
- A. \dr
- B. SHOW ROLES;
- C. LIST ROLES;
- D. \du
Answer: D
NEW QUESTION # 48
You want to check the current value of the max_connections parameter. Which SQL command should you use?
- A. GET max_connections;
- B. DISPLAY max_connections;
- C. SHOW max_connections;
- D. SELECT max_connections;
Answer: C
NEW QUESTION # 49
Which PostgreSQL configuration parameter controls the amount of memory used for sorting operations before writing to temporary disk files?
- A. maintenance_work_mem
- B. work_mem
- C. temp_buffers
- D. shared_buffers
Answer: B
NEW QUESTION # 50
You need to determine the names and definitions of all views in the edbuser schema. Which query should you use?
- A. Both B and C
- B. SELECT * FROM pg_views WHERE schemaname='edbuser';
- C. SELECT * FROM information_schema.views WHERE table_schema='edbuser';
- D. SELECT * FROM pg_views;
Answer: A
NEW QUESTION # 51
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?
- A. --wal-segsize
- B. --waldir
- C. -x
- D. No such option is available in PostgreSQL
Answer: A
NEW QUESTION # 52
Which psql command quits the psql interface?
- A. \exit
- B. All of the above
- C. \quit
- D. \q
Answer: B
NEW QUESTION # 53
You want to reload the PostgreSQL configuration without restarting the server. Which function should you execute?
- A. reload_configuration()
- B. pg_restart_conf()
- C. pg_refresh_conf()
- D. pg_reload_conf()
Answer: D
NEW QUESTION # 54
You need to restore only the schema from a custom format backup file. Which pg_restore option should you use?
- A. -s
- B. --schema-only
- C. Both B and C
- D. --data-only
Answer: C
NEW QUESTION # 55
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