Node.js – How to manage MongoDB connections in a Node.js web application

connection-poolingdatabase connectionmongodbnode.js

I'm using the node-mongodb-native driver with MongoDB to write a website.

I have some questions about how to manage connections:

  1. Is it enough using only one MongoDB connection for all requests? Are there any performance issues? If not, can I setup a global connection to use in the whole application?

  2. If not, is it good if I open a new connection when request arrives, and close it when handled the request? Is it expensive to open and close a connection?

  3. Should I use a global connection pool? I hear the driver has a native connection pool. Is it a good choice?

  4. If I use a connection pool, how many connections should be used?

  5. Are there other things I should notice?

Best Answer

The primary committer to node-mongodb-native says:

You open do MongoClient.connect once when your app boots up and reuse the db object. It's not a singleton connection pool each .connect creates a new connection pool.

So, to answer your question directly, reuse the db object that results from MongoClient.connect(). This gives you pooling, and will provide a noticeable speed increase as compared with opening/closing connections on each db action.

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