This tutorial introduces the key concepts of PostgreSQL high availability to ensure data consistency and minimize downtime.
Understanding the principles of replication, clustering, and failover is crucial for building robust and reliable database systems.
Replication is the process of copying data from a primary server to one or more secondary servers.
Different types of replication exist, including synchronous and asynchronous replication.
Synchronous replication ensures that data is written to the secondary server before the primary server acknowledges the write.
Asynchronous replication allows the primary server to write data before the secondary server is fully synchronized, which can improve write performance.
Clustering combines multiple database servers into a single logical unit.
This allows for automatic failover and provides redundancy.
Clustering can be implemented using various technologies, including database-specific clustering features.
Failover is the automatic switching of processing from one database server to another in the event of a failure.
Failover mechanisms can be configured to automatically failover to a standby server.
Benefits of PostgreSQL high availability include:
Implementing high availability principles is vital for maintaining data integrity and business continuity.