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Identity values are not affected by ROLLBACK operations, so if you insert rows in your table and then issue a ROLLBACK, the identity column will be incremented anyway. Even if your UNIQUE constraint causes the INSERT commands to fail, the identity values are consumed anyway. Example: IF OBJECT_ID('tempdb..#test_identity') IS NOT NULL DROP TABLE ...


LOAD the new data into a separate table (staging), without including the AUTO_INCREMENT field. Decide whether there are any duplicates that need to be avoided. INSERT ... SELECT (without id) to copy the "new" data into the real table. DROP TABLE staging;


As soon as you insert the data in new table, your next auto_increment value will be Max(id) + 1. Which means if you insert new row, the id given will be highest number in the id column. This post may be relevant to your question.

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