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Note: The question is part of a series of questions that use the same or similar answer choices. An answer choice may be correct for more than one question in the series. Each question is independent of the other question in the series. Information and details provided in a question apply only to that question. You have a database named DB1. The database does not use a memory-optimized filegroup. The database contains a table named Table1. The table must support the following workloads: You need to add the most efficient index to support the new OLTP workload, while not deteriorating the existing Reporting query performance. What should you do?
Correct Answer: C
Explanation/Reference: Explanation: A filtered index is an optimized nonclustered index, especially suited to cover queries that select from a well-defined subset of data. It uses a filter predicate to index a portion of rows in the table. A well-designed filtered index can improve query performance, reduce index maintenance costs, and reduce index storage costs compared with full-table indexes. References:https://technet.microsoft.com/en-us/library/cc280372(v=sql.105).aspx