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I’m working in Sql Server 2005. I have an event log table that tracks user actions, and I want to make sure that inserts into the table are as fast as possible. Currently the table doesn’t have any indexes. Does adding a single non-clustered index slow down inserts at all? Or is it only clustered indexes that slow down inserts? Or should I just add a clustered index and not worry about it?
Indexes, clustered or non-clustered,will always slow down inserts as SQL has to maintain both the table and index. This slowdown is in an “absolute” sense and you may not notice it. I would add whatever indexes are necessary to retrieve your data.