one of my aggregation query using match (a,b), graphlookup and unwind has explain output with index being used (idx_a_1_b_1) shows keys & docs examined is 0 with docs returned is around 300. So, my question is why does the docs and keys examined are 0 event though documents are returned?
Hi @Sateesh_Bammidi welcome to the community!
This is very hard to determine without actual examples, do you mind posting:
- some example documents
- the actual query you did
- the output of query explain plan using
db.collection.explain.aggregate(...)in the mongo shell - also the output of db.collection.getIndexes()
Best regards
Kevin