Template
single collection
multiple collections
mgodatagen
update
indexe
explain
Stage
Database
bson
mgodatagen
[{"_id":"id0"},{"_id":"id0#spr#a"},{"_id":"id1"},{"_id":"id1#spr#b"}]
Query
db.collection.find({_id:{$regex:"(^id0$)|(^id0#spr#)|(^id1$)|(^id1#spr#)"}})
Result