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??? You need to know how to work within your specific database environment, which often
includes having to know the ins and outs of the specific SQL syntax your database engine
supports. Dealing with the various SQL syntax gets worse if you intend to develop against
one database backend but release to production on another
?– Note Switching from one database backend to another is common in Rails development, because it??™s
usually easier to work locally with a database like MySQL, but many people prefer the higher performance of
an Oracle or SQL Server for production environments.
??? As you make updates and changes to your database, you must maintain those changes
across all of your environments??”and often there is no easy way of rolling back or
undoing those changes if errors occur.
CHAPTER 3 ?–  SETTING UP YOUR DATABASE 45
While none of these problems are show stoppers on their own, it certainly seems like
there should be an easier way to do things. And, as you probably guessed by now, Active
Record does have another option for you??”migrations.


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