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.
81. What is the primary goal of high availability in a PostgreSQL database system?
Answer:To minimize downtime and ensure database availability
82. In PostgreSQL, what is "failover" in the context of replication?
Answer:The process of switching to a standby server if the primary server becomes unavailable
83. What is "synchronous replication" in PostgreSQL?
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?
Answer:A replica server that can take over as the primary in case of a failure
85. What is "streaming replication" in PostgreSQL?
Answer:A method of replicating data by streaming changes from the primary to the standby server
86. What is "asynchronous replication" in PostgreSQL?
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?
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?
89. What is the "write-ahead log" (WAL) in PostgreSQL replication?
Answer:A log that records all changes made to the database, used for replication and recovery
90. What is "logical replication" in PostgreSQL?
Answer:A method of replicating data based on changes to specific tables or columns