Explanation:Certain mongo shell functions and properties are inaccessible in map-reduce operations. 10.The aggregation pipeline can use ___________ to improve its performance during some of its stages.
A. indexes
B. OptmData
C. functions
D. All of the mentioned
Answer:A
Explanation:Certain mongo shell functions and properties are inaccessible in map-reduce operations. 10.The aggregation pipeline can use ___________ to improve its performance during some of its stages.
A. indexes B. OptmData C. functions D. All of the mentioned
Explanation:Both the aggregation pipeline and map-reduce can operate on a sharded collection. Sanfoundry Global Education & Learning Series – MongoDB.