Adding RAM (vertical scaling) helps for a while, but eventually, you’ll hit a wall where a single server just can’t keep up with the read/write demands. That’s when you should look at database clusters.
Clustering spreads your data across multiple nodes, which gives you much better performance and, more importantly, “high availability”. If one node has an issue, the others keep the database online so your app doesn’t go down.
Setting this up manually is complicated, so a managed cloud platform like AccuWeb.Cloud is helpful here. They offer one-click setups for database clusters like MySQL, MariaDB, and PostgreSQL. It’s a lot easier than trying to configure replication and failover protocols by yourself.