Reasons not to use an auto-incrementing number for a primary key

Question

I\'m currently working on someone else\'s database where the primary keys are generated via a lookup table which contains a list of table names and the last primary key used

Answer 1

An auto generated ID can cause problems in situations where you are using replication (as I'm sure the techniques you've found can!). In these cases, I generally opt for a GUID.

If you are not likely to use replication, then an auto-incrementing PK will most likely work just fine.