CODEWITHSUNDEEP
meteor
yazz.com
yazz.com

Reputation: 58786

How does Meteor.js detect changes in MongoDB or Mysql?

How does Meteor.js detect changes in MongoDB or Mysql? Does it add triggers, or does it poll for changes? If if polls for changes then this seems a rather expensive operation

Update

I also found an explanation on the Meteor site after some more digging around:

https://www.meteor.com/livequery

Upvotes: 1

Views: 489

Answers (1)

user3374348
user3374348

Reputation: 4101

For MongoDB, Meteor tails the operation log (oplog) for changes. In production, this requires the database to be set up as a replica set (a one-member replica set is fine); if it isn't then it will fall back to polling. In development mode, oplog tailing is enabled by default. For more information, see this (slightly out-of-date) wiki page.

There's no native MySQL support in Meteor. There are packages which add MySQL support, but you'll have to read those packages' documentation to see if it uses triggers or polling.

Upvotes: 3

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