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The Ultimate Guide to Database High Availability

Percona

Load balancing : Traffic is distributed across multiple servers to prevent any one component from becoming overloaded. Load balancers can detect when a component is not responding and put traffic redirection in motion. Please note that these are presented as general best practices.

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Setting Up and Deploying PostgreSQL for High Availability

Percona

Backup and continuous archiving: PostgreSQL asynchronous replication relies on the write-ahead log (WAL) stream, and it’s vital to have centralized storage that all nodes can access. Such a proxy acts as the traffic cop between the applications and the database servers. Let’s start with the architectures.