Best Practices Hardware Small Business Virtualization 
Percona
JUNE 22, 2023
Defining high availability In general terms, high availability refers to the continuous operation of a system with little to no interruption to end users in the event of hardware or software failures, power outages, or other disruptions. If a primary server fails, a backup server can take over and continue to serve requests.
Percona
JULY 7, 2023
The tolerable downtime depends on business size, operations, and objectives, but that downtime must be minimal to minuscule (see the “Measuring high availability” chart below). HA in PostgreSQL databases delivers virtually continuous availability, fault tolerance, and disaster recovery. there cannot be high availability.
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