Okay. So each DHIS instance will require its own set of connections, so you should take required connections per instance and multiply with number of dhis instances for your max_connections.
Running 12 dhis instances on a single database servers sounds a bit too much, then the db must have enough mem to support close to 1000 connections. So bumping your max_connections will fix the problem, but might lead to trouble down the line. max_connections = 900
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