Primary versus unique keys

Hi

What impact is there in using a unique index instead of a primary key?

How does this impact performance?

How does this impact data file size?

Does it impact anything else?

Thanks

Hi,

http://www.mssqlcity.com/FAQ/General/primary_vs_unique_constraints.htm

HTH, jens Suessmeyer.

http://www.sqlserver2005.de

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Hi

It that the only difference?

Is there any impact on Replication, Database Mirroing (SQL 2005), or any other features?

Thanks

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There is an impact on transactional replication (all options) since it requires a primary key (unique indexes do not work). No impact to either merge or snapshot replication.

Database Mirroring and other features don't care.