http://mysql.new21.com

http://innodb.com/

MySQL/InnoDB-3.23.56, March 17, 2003

Fixed a major bug in InnoDB query optimization: queries of type SELECT ... WHERE indexcolumn < x and SELECT ... WHERE indexcolumn > x could cause a table scan even if the selectivity would have been very good.

버그 수정^^ innodb 를 사용하지 않는 경우에는 굳이 업그레이드 하지 않아도 될듯..