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PostgreSQL High Availability (or simply PostgreSQL HA) is a feature of PostgreSQL that replicates data from one PostgreSQL database server (called the master) to one or more PostgreSQL database servers (slaves). Database servers therefore can work together to allow a second server to take over quickly if the primary server fails (high availability), or to allow several computers to serve the same data (load balancing), database servers could work together seamlessly.
The PostgreSQL HA Setup Service includes:
PostgreSQL HA manager talks PostgreSQL's backend and frontend protocol, and relays a connection between them. Therefore, a database application (frontend) thinks that PostgreSQL HA is the actual PostgreSQL server, and the server (backend) sees PostgreSQL HA as one of its clients. Because PostgreSQL HA is transparent to both the server and the client, an existing database application can be used with PostgreSQL almost without a change to its sources.
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