 <p>providing the data is inserted in sequential order you shouldnt experience any performance issues.</p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/innodb-physical-structure.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.0/en/innodb-physical-structure.html</a></p> <p><a href="http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html" rel="nofollow noreferrer">http://dev.mysql.com/doc/refman/5.0/en/innodb-index-types.html</a></p>