SELECT * FROM XYZ WHERE del_date BETWEEN @datefrom AND @dateto AND orderid=@orderid AND seqno=@seqno ORDER BY orderid,
Now, after implementing the index, the query still responds very slowly. What other steps are needed to resolve the problem?
- Evaluate building a clustered index with the same column definition
- Evaluate building a clustered index based on an identity and separate non-clustered indexes for each column
- Evaluate building three separate non-clustered indexes for each of the columns
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