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Identity column as primary key

What are cons and pros for using IDENTITY property as PK in SQL SERVER 2000?

- small (4 bytes)
- automatic
- relatively predictable (unlike GUID)
- more usable (try WHERE guidColumn = {AECB...} when debugging a problem)

- meaningless identifier (this can also be a good thing)
- can have gaps (after delete or rollback)
- can't be used in some types of replication
- hotspot for insert if it is also clustered index
- not portable

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