PDF無料ダウンロードにはPostgreSQL-Essentials有効な練習テスト問題 [Q41-Q60]

PDF無料ダウンロードにはPostgreSQL-Essentials有効な練習テスト問題

PostgreSQL-Essentialsテストエンジンお試しセット、PostgreSQL-Essentials問題集PDF

EnterpriseDB PostgreSQL-Essentials 認定試験の出題範囲：

トピック	出題範囲
トピック 1	Creating and Managing Databases: This section of the exam measures the skills of Database Developers and focuses on creating, configuring, and maintaining databases. It assesses understanding of database lifecycle management, including setup, schema creation, and performance adjustments.
トピック 2	Backup and Recovery Tools Overview: This section of the exam measures the skills of System Engineers and covers the use of various backup and recovery tools, including their functionality, compatibility, and configuration. It focuses on selecting appropriate tools based on database type, size, and organizational recovery objectives.
トピック 3	Backup And Recovery Strategies: This section of the exam measures the skills of Database Administrators and focuses on developing an understanding of essential backup and recovery methods. It evaluates the ability to design, implement, and manage strategies that ensure data protection and system continuity in case of unexpected failures or data loss scenarios.
トピック 4	Fundamental SQL: This section of the exam measures the skills of Database Developers and covers foundational SQL concepts, including queries, joins, and data manipulation. It ensures that candidates can efficiently retrieve, update, and manage data within relational databases.
トピック 5	Database Maintenance: This section of the exam measures the skills of Database Administrators and covers maintenance operations such as updates, indexing, and performance optimization. The focus is on ensuring long-term database efficiency, integrity, and minimal downtime.

 

質問 # 41
Which configuration parameter limits the total number of connections available for your database cluster?

• A. log_connection
• B. superuser_reserved_connection
• C. tcp_keepalives_count
• D. max_connections

正解：D

質問 # 42
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. --data-only
• D. -s

正解：B

質問 # 43
You want to reload the PostgreSQL configuration without restarting the server. Which function should you execute?

• A. pg_reload_conf()
• B. pg_restart_conf()
• C. pg_refresh_conf()
• D. reload_configuration()

正解：A

質問 # 44
What is the purpose of the autovacuum parameter in PostgreSQL?

• A. To manually run vacuum
• B. To compress database files
• C. To enable automatic vacuuming of tables
• D. To backup data automatically

正解：C

質問 # 45
Which of the following commands in psql will execute SQL commands from a file?

• A. \i filename
• B. \x filename
• C. \e filename
• D. \f filename

正解：A

質問 # 46
Which of the following directories store symbolic links for user-defined tablespaces in PostgreSQL?

• A. base
• B. pg_wal
• C. global
• D. pg_tblspc

正解：D

質問 # 47
Which parameter specifies the number of connection slots reserved for superusers?

• A. admin_connections
• B. superuser_connections
• C. superuser_reserved_connections
• D. reserved_connections

正解：C

質問 # 48
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. No such option is available in PostgreSQL
• B. --wal-segsize
• C. -x
• D. --waldir

正解：B

質問 # 49
You are working as a Postgres DBA. You want to configure logging for slow running queries on your database cluster. Which setting needs to be modified to log all the queries which take more than 5 seconds?

• A. log_duration
• B. log_destination
• C. log_statement
• D. log_min_duration_statement

正解：D

質問 # 50
You want to take a data-only dump of the edbstore database, disable all triggers for faster restore, and use the INSERT command instead of COPY. Which pg_dump command options should you use?

• A. --data-only --inserts
• B. -a --inserts --disable-triggers
• C. -d --inserts --disable-triggers
• D. -a --copy --disable-triggers

正解：B

質問 # 51
You want to view all available functions in the current database using psql. Which command should you use?

• A. \df
• B. \f
• C. \fn
• D. \functions

正解：A

質問 # 52
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;

• A. Error: Cannot update column annsal
• B. Statement executes successfully and all the rows of emp table are modified
• C. Statement executes successfully but none of the rows of emp table are modified
• D. Error: Views cannot be updated

正解：A

質問 # 53
You need to reclaim storage occupied by dead tuples in the customers table. Which command should you use?

• A. VACUUM customers;
• B. CLUSTER customers;
• C. REINDEX customers;
• D. ANALYZE customers;

正解：A

質問 # 54
You have created a database user named edbuser with password 'password'. Which command grants connection rights to the edbstore database for user edbuser?

• A. GRANT ACCESS ON DATABASE edbstore TO edbuser;
• B. GRANT CONNECT ON DATABASE edbstore TO edbuser;
• C. GRANT ALL ON DATABASE edbstore TO edbuser;
• D. GRANT LOGIN ON DATABASE edbstore TO edbuser;

正解：B

質問 # 55
Which command reclaims all obsolete row space and compacts the customers table for reuse?

• A. VACUUM customers;
• B. VACUUM FULL customers;
• C. CLUSTER customers;
• D. ANALYZE customers;

正解：B

質問 # 56
Which command can be used to display all roles and their attributes in PostgreSQL using psql?

• A. LIST ROLES;
• B. \du
• C. SHOW ROLES;
• D. \dr

正解：B

質問 # 57
Which pg_dump option allows you to dump only the data without schema definitions?

• A. -d
• B. --no-schema
• C. --data-only
• D. -D

正解：C

質問 # 58
Which pg_restore option allows you to drop database objects before recreating them?

• A. -d
• B. -r
• C. -c or --clean
• D. --drop-all

正解：C

質問 # 59
Which parameter specifies the number of connections reserved for superusers in PostgreSQL?

• A. admin_connections
• B. superuser_reserved_connections
• C. max_superuser_connections
• D. reserved_connections

正解：B

質問 # 60
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