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The InnoDB and Berkley DB (BDB) database engines are direct products of the technology that makes MySQL so flexible, the MySQL++ API. Almost every challenge you're likely to face when using MySQL stems directly from the fact that the ISAM and MyISAM database engines aren't transactional and lack foreign-key support. Although much slower than the ISAM and MyISAM engines, InnoDB and BDB include the transactional and foreign-key support missing from the former two choices. As such, if your design requires either or both of these features, you are actually compelled to use one of these two choices.
