http://www.kinusati.net/2011/01/27/mysql%E3%81%8A%E5%8B%89%E5%BC%B7%E3%83%A1%E3%83%A2myisam%E3%82%B9%E3%83%88%E3%83%AC%E3%83%BC%E3%82%B8%E3%82%A8%E3%83%B3%E3%82%B8%E3%83%B3/ http://dev.mysql.com/doc/refman/5.1/ja/concurrent-inserts.html ht…