PostgreSQL, often referred to as Postgres, is a powerful open-source relational database management system (RDBMS) known for its scalability, robustness, and extensibility. It offers advanced features like ACID compliance, support for complex data types, and support for both SQL and NoSQL data. PostgreSQL is highly regarded for its performance, security, and reliability, making it a popular choice for applications ranging from small startups to large enterprises. Its active developer community continuously enhances and maintains the software. PostgreSQL is an excellent choice for data storage, analysis, and management in various domains, including web applications, data warehousing, and geospatial applications.
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Practice Test
101. What is the purpose of a "pg_dump" command in PostgreSQL?
A. To create a logical backup of a PostgreSQL database
B. To physically copy database files
C. To restore a database from a backup
D. To optimize query performance
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Answer: To create a logical backup of a PostgreSQL database
102. What does a "pg_dumpall" command do in PostgreSQL backup?
A. It creates a backup of all PostgreSQL databases and roles
B. It performs a full system backup of the PostgreSQL server
C. It optimizes the database performance
D. It copies only specific tables from a database
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Answer: It creates a backup of all PostgreSQL databases and roles
103. Which PostgreSQL command is used to back up a database cluster, including all databases and configuration files?
A. pg_basebackup
B. pg_dump
C. pg_copy
D. pg_restore
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Answer: pg_basebackup
104. What is the purpose of a "pg_dump" with the "--format=c" option?
A. To create a custom-format backup file
B. To create a plain-text SQL file
C. To optimize query performance
D. To copy binary database files
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Answer: To create a custom-format backup file
105. What does a "pg_dump" with the "--file" option do in PostgreSQL backup?
A. Specifies the output file for the backup
B. Specifies the database to be backed up
C. Enables parallel backup
D. Compresses the backup
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Answer: Specifies the output file for the backup
106. What is the purpose of a "pg_restore" command in PostgreSQL?
A. To restore a database from a backup created with pg_dump
B. To optimize query performance
C. To create a backup of the PostgreSQL configuration
D. To physically copy database files
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Answer: To restore a database from a backup created with pg_dump
107. What does a "pg_restore" with the "--create" option do?
A. It creates a new database during the restore process
B. It optimizes the database's query performance
C. It deletes all existing data before restoring
D. It specifies the file to restore
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Answer: It creates a new database during the restore process
108. Which PostgreSQL command is used to perform a point-in-time recovery (PITR) from a continuous archive of WAL files?
A. pg_waldump
B. pg_restore
C. pg_basebackup
D. pg_receivewal
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Answer: pg_waldump
109. What is the purpose of a "pg_receivewal" command in PostgreSQL?
A. To stream Write-Ahead Logs (WAL) from a primary to a standby server
B. To create a backup of the database
C. To optimize query performance
D. To restore a database from a backup
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Answer: To stream Write-Ahead Logs (WAL) from a primary to a standby server
110. What is the primary goal of continuous archiving and point-in-time recovery (PITR) in PostgreSQL backup and restore?
A. To provide a way to recover the database to a specific point in time
B. To create an exact copy of the database
C. To optimize query performance
D. To create daily backups
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Answer: To provide a way to recover the database to a specific point in time
