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A database connection limit is one of those settings you never think about until a busy day makes it suddenly very relevant.
What a Connection Is
Each time your website's code needs to talk to the database, it opens a connection. Under normal traffic, these connections open and close quickly, often in milliseconds.
Why Limits Exist
Each open connection consumes server memory. A limit keeps one site or application from consuming so many simultaneous connections that it starves other sites on the same shared server of database resources.
What Happens When You Hit the Limit
New connection attempts fail, typically producing a "too many connections" error and preventing parts of your site from loading correctly until existing connections free up.
What Usually Causes This
A genuine traffic spike is the most common cause, but inefficient code that opens connections without properly closing them (a "connection leak") can also gradually exhaust the limit even under normal traffic.
How to Address It
Caching reduces how often your code needs to query the database at all. If your traffic has genuinely grown, upgrading to a plan with a higher connection limit — typically available on VPS and dedicated plans — resolves it directly.
