Site went down for 400 contemporary visitors

Do you think it's normal that our site went down with 400 simultaneous visitors during a live stream event?
The message "Error connecting to the database" was the only thing showing up on the wordpress based site.
We have the following plan:

4 GB RAM
2 CPU Cores
80 GB SSD Storage
4 TB Transfer
40 Gbps Network In
4000 Mbps Network Out

How many simultaneous visitors do you think this plan allow?

2 Replies

I would start by checking your database server logs.

If you haven't already, I'd recommend looking into both WordPress caching and optimizing MySQL for better performance. There's many WordPress caching plugins to choose from, but they'll all work to allow your site to serve static content where possible. This will reduce the load on your database while the optimization will allow your database to handle more traffic in most cases.

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