I manage a site that got a sudden and unexpected increase in traffic. Because of that, there are database access timeouts, with the "Error Establishing Database Connection" message.
This is not a configuration problem, but a 'load' problem. I have installed a caching plugin to help, which has helped somewhat.
What I would like to do, while still trying to mitigate traffic levels, is to change the message that is shown on the screen. Is there a filter or a template that can be used to change that error message.
Note that my question is not related to database authentication problems, but how to put up a message other than the one shown, or to redirect to a more 'static' page (that the caching plugin can help with). The hosting location cannot provide additional resources, and I don't want/need to change to a more powerful and expensive hosting solution.