Fix 'too many connections' in Go by setting MaxOpenConns, MaxIdleConns, and ConnMaxLifetime on your sql.DB instance.
The error occurs because your application is creating more database connections than the pool allows or the database can handle. Increase the maximum open connections and set a timeout for idle connections to prevent leaks.
db.SetMaxOpenConns(25)
db.SetMaxIdleConns(10)
db.SetConnMaxLifetime(time.Hour)
If the error persists, ensure you are reusing the same *sql.DB instance across your application instead of creating a new one for every request.
The "too many connections" error with Go Database Pools means your program is trying to talk to the database with too many open lines at once. Think of it like a phone switchboard where every caller gets a new line; if everyone calls at once, the switchboard crashes. The fix is to limit how many lines are open at the same time and close old ones that aren't being used.