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// Desired unique index: | |
// db.collection.ensureIndex({ firstField: 1, secondField: 1 }, { unique: true}) | |
db.collection.aggregate([ | |
{ $group: { | |
_id: { firstField: "$firstField", secondField: "$secondField" }, | |
uniqueIds: { $addToSet: "$_id" }, | |
count: { $sum: 1 } | |
}}, | |
{ $match: { | |
count: { $gt: 1 } | |
}} | |
]) |
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