Explanation:Querying only the index can be much faster than querying documents outside of the index. 2. Point out the wrong statement :
A. Query selectivity refers to how well the query predicate excludes or filters out documents in a collection
B. Query selectivity can determine whether or not queries can use indexes effectively or even use indexes at all
C. More selective queries match a larger percentage of documents
D. All of the mentioned
Answer:A
Explanation:Querying only the index can be much faster than querying documents outside of the index. 2. Point out the wrong statement :
A. Query selectivity refers to how well the query predicate excludes or filters out documents in a collection B. Query selectivity can determine whether or not queries can use indexes effectively or even use indexes at all C. More selective queries match a larger percentage of documents D. All of the mentioned
Explanation:More selective queries match a smaller percentage of documents. 3. ___________ is used to determine whether a query is a covered query .