Mongo command to add a field to all documents in a collection

Question

This code appends a boolean column to all documents in the birds collection.

db.birds
 .find()
 .snapshot()
 .forEach(function(el) {
 el.hi = true
 db.birds.save(el)
 })

Here's how the command is run in production.

mongo db_stuff/db_name -u username -p password theScript.js

This command runs very slowly. Should I look into the $set operator or something else that will speed this up?

• Mast: What does your db look like? Size? Columns? Types? A schema is usually required when asking about db optimisations.

Answer 1

This is a lot faster:

db. birds.updateMany(
 {},
 { $set:
 {
 hi: true
 }
 }
)

• t3chb0t: That's great! But this is not a review :-(
• Yitzchok: This is definitely the way to go.