Explanation:In MongoDB, sort operations can obtain the sort order by retrieving documents based on the ordering in an index. 2. Point out the wrong statement :
A. The query scans the index and not the collection
B. If overall selectivity is high, and if MongoDB must read a number of documents to return results, then some queries may perform faster without indexes
C. A better strategy, depending on your queries, would be to create a compound index that includes the high-selectivity field and another field
D. None of the mentioned
Answer:A
Explanation:In MongoDB, sort operations can obtain the sort order by retrieving documents based on the ordering in an index. 2. Point out the wrong statement :
A. The query scans the index and not the collection B. If overall selectivity is high, and if MongoDB must read a number of documents to return results, then some queries may perform faster without indexes C. A better strategy, depending on your queries, would be to create a compound index that includes the high-selectivity field and another field D. None of the mentioned
Explanation:To ensure selectivity, write queries that limit the number of possible documents with the indexed field. Write queries that are appropriately selective relative to your indexed data. 3. _________ defines a circle for a geospatial query that uses spherical geometry.