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>My suggestion would be to check out the Primary Key article on Craig's site (www.craigberntson.com). Uniqueness is enforced by an flock() on the keys table before obtaining the next key value (which I think is clever, Craig).
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Thanks. For the record, many people have told me they use my code to generate their PKs, often times in heavily used tables. No one has experienced any problems with the FLOCK().