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    <p>Not the answer you may be looking for, but you should consider using a GUID as a key. This will ensure that you have some type of unique identifier for your all records and that you can avoid collisions with identity keys / integer based indexes. It would add another degree of traceability should something go wrong when you migrate between databases.</p> <p>SplendidCRM uses this technique when importing data from other DB systems. </p> <hr> <p>Update:</p> <p>My assumption was that the operation of transferring data between databases was not that frequent and that you needed database architecture for that task. I would use the GUID as lookup key specifically validation for the transfer of data, but I would NOT use that as a primary key for joins for standard operations like URL's. Although unique across databases, the trade-off is that GUIDs are slow.</p> <p>In other words, the GUIDS would in addition to your existing primary keys now, and act as a means of validation for you should something go wrong. If you need ClientID in Database A to retain the same value in Database B then an identity column as that identifier will be an issue. You may have to create another identifier that is not "auto-generated". This could something other than the GUID, but my instinct is that integers alone will not be enough. Maybe you can create a columns that is a hash of the identity key, customer name and database name, or more simply, just concatenate those columns into a varchar column.</p>
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    1. POMoving client data from one database to a new one
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    1. USDavid Robbins
    1. USDavid Robbins
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    1. CODavid, are there performance trade-offs if you use GUID keys and do a lot of joins? Also, one reason we did not go this route is we thought it would make a mess of our application URLs when referring to a resource.
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