is mongo update ($set) on a single document atomic

Question

I have a code similar to

db.myColletion.update({'_id':ObjectId("...")}, {'$set': {'state': 'CA'}})

Is above an atomic operation?

Do I need to use findAndModify even on single document for atomicity??

possible duplicate of [what's the diff between findAndModify and update in MongoDB?](http://stackoverflow.com/questions/10778493/whats-the-diff-between-findandmodify-and-update-in-mongodb) — pennstatephil, May 31 '14 at 21:04

score 10 · Accepted Answer · edited Oct 22 '18 at 20:14

10

Yes, all write operations with MongoDB are atomic at the level of a single document.

The key difference between update and findAnyModify is that the latter also provides you with the original or updated document.

edited Oct 22 '18 at 20:14

Community

answered May 31 '14 at 21:07

JohnnyHK

score 5 · Answer 2 · answered Feb 10 '15 at 23:24

5

When modifying a single document, both findAndModify and the update() method atomically update the document.

answered Feb 10 '15 at 23:24

turtlemonvh

2 Answers2