findupdateOneinsertOne – InterviewSolution

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1.	findupdateOneinsertOne
Answer» MongoDB supports Capped COLLECTIONS which are fixed-size collections. Once the allocated space is filled up, space is made for new documents by REMOVING (OVERWRITING) oldest documents. The insertion order is preserved and if a query does not specify any ORDERING then the ordering of results is same as the insertion order. The oplog.rs collection is a capped collection, thus ensuring that the collection of logs do not GROW infinitely.

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db.employee.find({"employeeid" : {"$gte" : 15000, "$lte" : 70000}});