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We have a setup where the WordPress's MySQL database is replicated to a secondary MySQL server in case the primary fails. Are there any plugins or methods which would automatically switch to the secondary database server if the first one is unreachable ?

PS. Tried Hyper-DB but we don't exactly trust it since development on it stopped a while ago.

Thanks in advance.

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HyperDB is awesome. You shouldn't worry about its dev date (which by the way, its being done by Automattic - the team behind WordPress).

HyperDB has some bigger advantages like spreading read/writes across servers and splitting them and its mostly used for such purposes (bigger scales).

In your case, I would go for a VIP VPS that would run Heartbeat, or a Failover service, since I do understand that your scope is HA and not Load Balancing.

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