How do change streams with fullDocument=updateLookup works?

Change stream send a new query to Mongo server for full document when set fullDocument:updateLookup?
How does it affect performance?

Hi @YLY_SW,

T
Welcome to MongoDB community!

The exact impact is hard to predict and it requires performance testing with ur data .

However, there is obviously an overhead to the operation as the full document must be lookedup as not all data is present in oplog for it

Best
Pavel

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