Is it good to create new indexes for better performance - SQL Server
I always take careful consideration when creating indexes on production systems, always try to create in DEV first. There are several reasons, but the top three for me are. First, there is a cost associated to indexes, essentially more overhead, so depending on your table the cost can be quite high. Second, I am never always privy to all the functionality that could be accessing that table/dataset, so I have seen negative results in other parts of an application due to adding indexes for other reasons. Third, if this is a data warehouse or a table that experiences frequent writes/loads, then you may actually negatively affect performance (unless you drop and add the indexes before and after).