Why is it recommended not to close a MongoDB connection anywhere in Node.js code?

by

You open a Db connection once with MongoClient and reuse it across your application. If you need to use multiple db’s you use the .db function on the Db object to work on a different db using the same underlying pool of connections. A pool is kept to ensure a single blocking operation cannot freeze up your node.js application. Default size if 5 connections in a pool.

http://mongodb.github.io/node-mongodb-native/driver-articles/mongoclient.html

I also forgot to add. As the other answer pointed out setting up a new TCP connection is EXPENSIVE timewise and memory wise that’s why you reuse connections. Also a new connection will cause a new Thread to be created on MongoDB using memory on the Db as well.

More Related Contents:

  1. Unable to delete data from mongoDB
  2. collection is not defined in mongodb
  3. Push items into mongo array via mongoose
  4. Mongoose populate vs object nesting
  5. Populate nested array in mongoose
  6. Cannot overwrite model once compiled Mongoose
  7. Can mongo upsert array data?
  8. Mongoose Schema hasn’t been registered for model
  9. Mongoose findByIdAndUpdate not returning correct model
  10. Mongoose duplicate key error with upsert
  11. How can I use a cursor.forEach() in MongoDB using Node.js?
  12. MongoDB Node check if objectid is valid
  13. MongoNetworkError: failed to connect to server [localhost:27017] on first connect [MongoNetworkError: connect ECONNREFUSED 127.0.0.1:27017]
  14. Mongoose update without callback
  15. projection not working with find query
  16. Model.find().toArray() claiming to not have .toArray() method
  17. How to fix ‘Error: querySrv EREFUSED’ when connecting to MongoDB Atlas?
  18. MongoError: connect ECONNREFUSED 127.0.0.1:27017
  19. Difference between MongoDB and Mongoose
  20. How can I save multiple documents concurrently in Mongoose/Node.js?
  21. Setting up singleton connection with node.js and mongo
  22. log all queries that mongoose fire in the application
  23. Combine two OR-queries with AND in Mongoose
  24. Node.js + MongoDB: insert one and return the newly inserted document
  25. Mongoose – finding subdocuments by criteria
  26. Mongoose findOneAndUpdate and runValidators not working
  27. Mongoose select fields to return from findOneAndUpdate
  28. mongoose recursive populate
  29. Heroku app crashes after MongoDB updated to 3.0
  30. Error at connecting to MongoDb Atlas Server

Leave a Comment