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.
Show All Answers
Practice Test
81. What is the primary goal of high availability in a PostgreSQL database system?
A. To minimize downtime and ensure database availability
B. To maximize data storage capacity
C. To improve query performance
D. To reduce the number of database connections
Show Answer
Report This Question
Answer: To minimize downtime and ensure database availability
82. In PostgreSQL, what is "failover" in the context of replication?
A. The process of switching to a standby server if the primary server becomes unavailable
B. The process of creating a new database
C. The process of optimizing query performance
D. The process of taking database backups
Show Answer
Report This Question
Answer: The process of switching to a standby server if the primary server becomes unavailable
83. What is "synchronous replication" in PostgreSQL?
A. A replication method where data changes are synchronized with the primary server before a transaction is considered committed
B. A method for creating read-only replicas
C. A method for optimizing query performance
D. A method for creating new databases
Show Answer
Report This Question
Answer: A replication method where data changes are synchronized with the primary server before a transaction is considered committed
84. What is a "standby server" in PostgreSQL replication?
A. A replica server that can take over as the primary in case of a failure
B. A server for creating new databases
C. A server for query optimization
D. A server used for database backups
Show Answer
Report This Question
Answer: A replica server that can take over as the primary in case of a failure
85. What is "streaming replication" in PostgreSQL?
A. A method of replicating data by streaming changes from the primary to the standby server
B. A method for optimizing query performance
C. A method for creating new databases
D. A method for taking database backups
Show Answer
Report This Question
Answer: A method of replicating data by streaming changes from the primary to the standby server
86. What is "asynchronous replication" in PostgreSQL?
A. A replication method where data changes are not synchronized with the primary server immediately
B. A method for creating read-only replicas
C. A method for taking database backups
D. A method for optimizing query performance
Show Answer
Report This Question
Answer: A replication method where data changes are not synchronized with the primary server immediately
87. What is the purpose of "replication slots" in PostgreSQL?
A. To keep track of which changes have been received by standby servers
B. To store backups of the database
C. To optimize query performance
D. To create new databases
Show Answer
Report This Question
Answer: To keep track of which changes have been received by standby servers
88. In PostgreSQL, what is the term for a standby server that is in "hot standby" mode, ready to take over as the primary?
A. Hot Standby
B. Active Standby
C. Primary Standby
D. Warm Standby
Show Answer
Report This Question
Answer: Hot Standby
89. What is the "write-ahead log" (WAL) in PostgreSQL replication?
A. A log that records all changes made to the database, used for replication and recovery
B. A log that stores query plans
C. A log that tracks database connections
D. A log for taking database backups
Show Answer
Report This Question
Answer: A log that records all changes made to the database, used for replication and recovery
90. What is "logical replication" in PostgreSQL?
A. A method of replicating data based on changes to specific tables or columns
B. A method for creating new databases
C. A method for optimizing query performance
D. A method for taking database backups
Show Answer
Report This Question
Answer: A method of replicating data based on changes to specific tables or columns
