Question
a.
In MongoDB 3.0, cursor.explain() returns the indexOnly field to indicate whether the index covered a query
b.
When an index covers a query, MongoDB can both match the query conditions and return the results using only the index keys
c.
For read-heavy applications, deploy sharding and add one or more shards to a sharded cluster to distribute load among mongod instances
d.
All of the mentioned
Posted under MongoDb Administration Concepts MongoDB
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