I am using nextjs 15 app router with mongodb as database.i simply want to fetch data in server component.Here i'm following the official example.

https://github.com/vercel/next.js/tree/canary/examples/with-mongodb

They use this file: mongodb.ts

import { MongoClient } from "mongodb";

if (!process.env.MONGODB_URI) {
  throw new Error('Invalid/Missing environment variable: "MONGODB_URI"');
}

const uri = process.env.MONGODB_URI;
const options = { appName: "devrel.template.nextjs" };

let client: MongoClient;

if (process.env.NODE_ENV === "development") {
  // In development mode, use a global variable so that the value
  // is preserved across module reloads caused by HMR (Hot Module Replacement).
  let globalWithMongo = global as typeof globalThis & {
    _mongoClient?: MongoClient;
  };

  if (!globalWithMongo._mongoClient) {
    globalWithMongo._mongoClient = new MongoClient(uri, options);
  }
  client = globalWithMongo._mongoClient;
} else {
  // In production mode, it's best to not use a global variable.
  client = new MongoClient(uri, options);
}

// Export a module-scoped MongoClient. By doing this in a
// separate module, the client can be shared across functions.

export default client;

But they are not telling how to properly connect to db before making a request

They have this testDatabaseConnection() functoin in actions.ts file,which is called in the page.tsx file.So am i supposed to call this function in every page ?

Additional question: 1.Do i need to cache database connection? 2.Will face any problems in production when lot of users connect to the database?

Note:

I don't want to use mongoose because my use case is different.