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cluster index and update and delete

We have a performance issue for a large database. I plan to place a cluster index to a key table which involved a lot of update and delete activity. I want to know if cluster index will slow down the update and delete activities. What is the best way to do that? any other alternative?
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my question is still I want to know if having cluster index will help faster update or delete in the table if I implement the column(s) correctly?
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Yes, it has currently non-clustered index(es) in place over the same columns. What's your other suggestion?
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I wonder if dropping the original non-cluster index will cause problem for the application?
It will if you don't have the clustered index in place first.
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You should capture and save all existing index stats as well as the missing index stats before changing the indexes, otherwise the current info will be lost.

You should also review that info to verify that you are creating the clustered index with the correct column(s).