If I stop a long running query, does it rollback?

Question

A query that is used to loop through 17 millions records to remove duplicates has been running now for about 16 hours and I wanted to know if the query is sto

Answer 1

DELETES that have been performed up to this point will not be rolled back.

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As the original author of the code in question, and having issued the caveat that performance will be dependant on indexes, I would propose the following items to speed this up.

RecordId better be PRIMARY KEY. I don't mean IDENTITY, I mean PRIMARY KEY. Confirm this using sp_help

Some index should be used in evaluating this query. Figure out which of these four columns has the least repeats and index that...

SELECT *
FROM MyTable
WHERE @long = longitude
  AND @lat = latitude
  AND @businessname = BusinessName
  AND @phoneNumber = Phone

Before and After adding this index, check the query plan to see if index scanning has been added.