{"id":456,"date":"2010-07-21T15:50:44","date_gmt":"2010-07-21T06:50:44","guid":{"rendered":"http:\/\/labs.gree.jp\/blog\/?p=456"},"modified":"2021-04-27T15:03:17","modified_gmt":"2021-04-27T06:03:17","slug":"post456","status":"publish","type":"post","link":"https:\/\/labs.gree.jp\/blog\/2010\/07\/456\/","title":{"rendered":"\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30fb\u30e9\u30f3\u30ad\u30f3\u30b0\u3092\u8003\u3048\u308b"},"content":{"rendered":"<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_0\"> \u306f\u3058\u3081\u306b<\/h3>\n<p>\u3053\u3093\u306b\u3061\u306f\u3002\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u958b\u767a\u90e8\u306esp1rytus\u3068\u7533\u3057\u307e\u3059\u3002<br \/>\n\u5148\u65e5\u3001\u79c1\u3082\u3064\u3044\u306b30\u6b73\u306e\u304a\u3063\u3055\u3093\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3057\u305f\u3002\u52a0\u9f62\u81ed\u304c\u51fa\u306a\u3044\u3088\u3046\u306b\u304c\u3093\u3070\u308a\u307e\u3059\uff01<\/p>\n<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_1\"> \u30e9\u30f3\u30ad\u30f3\u30b0\u3063\u3066\uff1f<\/h3>\n<p>\u30e9\u30f3\u30ad\u30f3\u30b0\u306f\u8ab0\u3067\u3082\u308f\u304b\u308b\u3001\u4f55\u3089\u304b\u306e\u5f97\u70b9\u3092\u30bd\u30fc\u30c8\u3057\u3066\u9806\u4f4d\u4f4d\u7f6e\u3092\u6c7a\u5b9a\u3059\u308b\u51c4\u304f\u7c21\u5358\u3067\u30b7\u30f3\u30d7\u30eb\u306a\u3082\u306e\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u30b2\u30fc\u30e0\u3092\u6271\u3046\u30b3\u30f3\u30c6\u30f3\u30c4\u30fb\u30b5\u30fc\u30d3\u30b9\u306b\u304a\u3044\u3066\u306f\u3001\u5f97\u70b9\u3092\u901a\u7b97\/\u65e5\u5225\u306b\u9806\u4f4d\u4ed8\u3051\u3055\u308c\u305f\u3082\u306e\u304c\u76f4\u3050\u306b\u76ee\u306b\u5165\u308b\u3088\u3046\u306b\u3001\u4ed6\u4eba\u3068\u81ea\u5206\u3092\u6bd4\u8f03\u3059\u308b\u975e\u5e38\u306b\u91cd\u8981\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u3053\u3067\u3001\u3053\u306e\u8a18\u4e8b\u3067\u306f\u6b21\u306e\uff13\u3064\u8981\u4ef6\u3092\u6e80\u305f\u3059\u3088\u3046\u306a\u30e9\u30f3\u30ad\u30f3\u30b0\u30fb\u30b7\u30b9\u30c6\u30e0\u306e\u96e3\u3057\u3055\u3068\u3001\u305d\u308c\u3092\u89e3\u6c7a\u3059\u308b\u305f\u3081\u306e\u4e00\u4f8b\u3092\u7c21\u5358\u306b\u8aac\u660e\u3055\u305b\u3066\u9802\u304d\u307e\u3059\u3002<\/p>\n<ul>\n<li> \u9806\u4f4d\u4ed8\u3051\u306f\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u884c\u3044\u3001\u96c6\u8a08\u6642\u9593\u3092\u5fc5\u8981\u3068\u3057\u306a\u3044\u3002<\/li>\n<li> 100\u4e07\u4ef6\u4ee5\u4e0a\u306e\u5f97\u70b9\u30c7\u30fc\u30bf\u304c\u6271\u3048\u308b\u3002<\/li>\n<li> \u3059\u3079\u3066\u306e\u30c7\u30fc\u30bf\u304c\u6b63\u3057\u3044\u9806\u4f4d\u4ed8\u3051\u3067\u53d6\u5f97\u3067\u304d\u308b(\u7dda\u5f62\u88dc\u5b8c\u306a\u3069\u3067\u9806\u4f4d\u3092\u6982\u7b97\u3057\u306a\u3044\uff09\u3002<\/li>\n<\/ul>\n<p>\u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u306b\u3088\u308b\u6b63\u78ba\u306a\u9806\u4f4d\u4ed8\u3051\u306f\u3001\u30c7\u30fc\u30bf\u4ef6\u6570\u304c\u5c0f\u3055\u3044\u5834\u5408\u306b\u306f\u5bb9\u6613\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u305d\u3046\u3067\u3059\u304c\u3001\u30c7\u30fc\u30bf\u4ef6\u6570\u304c\u591a\u304f\u306a\u308b\u306b\u3064\u308c\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3088\u304f\u52d5\u4f5c\u3055\u305b\u308b\u3053\u3068\u304c\u975e\u5e38\u306b\u56f0\u96e3\u306b\u306a\u3063\u3066\u304d\u307e\u3059\u3002<\/p>\n<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_2\"> \u30c7\u30fc\u30bf\u4ef6\u6570\u304c\u5c11\u306a\u3044\u3068\u304d\u306e\u624b\u7d9a\u304d<\/h3>\n<p>\u30e6\u30fc\u30b6ID\u3068\u5f97\u70b9\u3092\u3001\u6b21\u306e\u3088\u3046\u306bMySQL\u3067\u7ba1\u7406\u3059\u308b\u5834\u5408\u3092\u4f8b\u306b\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n mysql> SELECT * FROM user_point;\n +---------+--------+\n | user_id | point  | \n +---------+--------+\n |     109 | 294870 | \n |     108 |  94746 | \n |     107 |  61065 | \n |     106 |  41248 | \n |     105 |  32730 | \n |     104 |   8590 | \n |     103 |   7859 | \n |     102 |   5756 | \n |     101 |   4641 | \n |     100 |   1541 | <\/pre>\n<p>\u30e6\u30fc\u30b6ID:105\u3001\u5f97\u70b9:32730\u70b9\u306e\u9806\u4f4d\uff08\u5f97\u70b9\u306e\u9ad8\u3044\u9806\u306b\u30bd\u30fc\u30c8\uff09\u3092\u6c42\u3081\u308b\u5834\u5408\u3001\u6b21\u306e\u3088\u3046\u306a\u30af\u30a8\u30ea\u30fc\u3092\u4f7f\u3046\u3068\u7c21\u5358\u306b\u6c42\u3081\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n mysql> SELECT point FROM user_point WHERE user_id = 105;\n +-------+\n | point |\n +-------+\n | 32730 |\n +-------+\n\n mysql> SELECT COUNT(*) + 1 AS rank FROM user_point WHERE 32730 < point;\n +------+\n | rank |\n +------+\n |    5 |\n +------+<\/pre>\n<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_3\"> \u30c7\u30fc\u30bf\u4ef6\u6570\u304c\u591a\u304f\u306a\u308b\u3068\u306a\u306b\u304c\u8d77\u3053\u308b\u306e\u304b<\/h3>\n<p>\u5f97\u70b9\u30c7\u30fc\u30bf\u304c\u983b\u7e41\u306b\u66f4\u65b0(UPDATE)\u3055\u308c\u308b\u3088\u3046\u306a\u30e9\u30f3\u30ad\u30f3\u30b0\u30fb\u30b7\u30b9\u30c6\u30e0\u306e\u5834\u5408\u3001\u30c6\u30fc\u30d6\u30eb\u30ed\u30c3\u30af\u3068\u3044\u3046\u7279\u6027\u3092\u6301\u3064MyISAM\u3060\u3068\u30c7\u30fc\u30bf\u306e\u66f4\u65b0\u304c\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u306b\u306a\u308b\u305f\u3081\u3001\u4e26\u5217\u6027\u304c\u9ad8\u3044\u884c\u30ec\u30d9\u30eb\u30ed\u30c3\u30af\u3067\u3042\u308bInnoDB\u3092\u4f7f\u3044\u307e\u3059\u3002\u3057\u304b\u3057\u3001InnoDB\u3092\u63a1\u7528\u3057\u305f\u3053\u3068\u306b\u3088\u308a\u5f97\u70b9\u30c7\u30fc\u30bf\u304c10\u4e07\u4ef6\u3092\u8d85\u3048\u305f\u8fba\u308a\u304b\u3089\u6b21\u306e\u3088\u3046\u306a\u73fe\u8c61\u304c\u8d77\u3053\u308a\u306f\u3058\u3081COUNT\u30af\u30a8\u30ea\u30fc\u306b\u5de5\u592b\u304c\u5fc5\u8981\u3060\u3068\u611f\u3058\u306f\u3058\u3081\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\nMySQL slow-query \u30ed\u30b0\u3088\u308a\n# Query_time:21.1  Lock_time:0.026247 Rows_sent: 1  Rows_examined:112418\nmysql> select COUNT(*) + 1 AS rank from user_point WHERE 32730 < point;<\/pre>\n<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_4\"> \u8ca0\u8377\u3092\u8efd\u6e1b\u3055\u305b\u308b\u8003\u3048\u65b9<\/h3>\n<p>\u3042\u308b\u5f97\u70b9\u304b\u3089\u3001\u3042\u308b\u5f97\u70b9\u307e\u3067\u306e\u533a\u9593\u306b\u73fe\u5728\u4f55\u4eba\u304c\u5c5e\u3057\u3066\u3044\u308b\u304b\u3092\u6b21\u306e\u3088\u3046\u306a\u30c7\u30fc\u30bf\u69cb\u6210\u3067\u8868\u73fe\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"superpre \">\n mysql> select * from user_point;\n +---------+--------+---------------+\n | user_id | point  | partition_id  |\n +---------+--------+---------------+\n |     100 |   1541 |            10 |\n |     101 |   4641 |            10 |\n |     102 |   5756 |            10 |\n |     103 |   7859 |            10 |\n |     104 |   8590 |            10 |\n |     105 |  32730 |             7 |\n |     106 |  41248 |             6 |\n |     107 |  61065 |             5 |\n |     108 |  94746 |             5 |\n |     109 | 294870 |             1 | \n\n mysql> select * from partition;\n +------+-----------+------------+------+\n | id   | min_point | max_point  | num  |\n +------+-----------+------------+------+\n |    1 |    250000 |     300000 | 245  |\n |    2 |    200000 |     250000 | 132  |\n |    3 |    150000 |     200000 | 144  |\n |    4 |    100000 |     150000 | 1561 |\n |    5 |     50000 |     100000 | 1244 |\n |    6 |     40000 |      50000 | 1309 |\n |    7 |     30000 |      40000 | 1345 |\n |    8 |     20000 |      30000 | 1627 |\n |    9 |     10000 |      20000 | 2736 |\n |   10 |         0 |      10000 | 2736 |   \u2190 num\u306e\u5024\u306f\u30b5\u30f3\u30d7\u30eb\u3067\u3059\n +------+-----------+------------+------+<\/pre>\n<p>\u6307\u5b9a\u30e6\u30fc\u30b6\u306e\u5f97\u70b9\u9806\u4f4d\u3092\u6c42\u3081\u308b\u624b\u7d9a\u304d<\/p>\n<ol>\n<li> user_id\u3092\u304b\u3089(\u5f97\u70b9, \u6240\u5c5e\u3059\u308b\u533a\u9593)\u30c7\u30fc\u30bf\u3092\u53d6\u5f97\u3059\u308b\u3002<\/li>\n<li> (1)\u3067\u53d6\u5f97\u3057\u305f\u30e6\u30fc\u30b6\u306e\u6240\u5c5e\u533a\u9593\u3088\u308a\u4e0a\u4f4d(min_point, or max_point\u304c\u5927\u304d\u3044)\u533a\u9593\u306e\u4eba\u6570\u5408\u8a08\u3092\u6c42\u3081\u308b\u3002<\/li>\n<li> (1)\u3067\u53d6\u5f97\u3057\u305f\u30e6\u30fc\u30b6\u306e\u6240\u5c5e\u533a\u9593\u5185\u3067\u3001\u5927\u304d\u3044\u5f97\u70b9\u3068\u306a\u308b\u4eba\u6570\u3092\u6c42\u3081\u308b\u3002<\/li>\n<li> (2), (3)\u3067\u6c42\u3081\u3089\u308c\u305f\u4eba\u6570\u306e\u548c + 1\u304c\u9806\u4f4d\u306b\u306a\u308b\u3002<\/li>\n<\/ol>\n<p>(\u4f8b) user_id:105\u3067\u4e0a\u306e\u624b\u9806\u3092\u5b9f\u884c\u3059\u308b\u3068<\/p>\n<ol>\n<li> (\u5f97\u70b9, \u6240\u5c5e\u3059\u308b\u533a\u9593)\u30c7\u30fc\u30bf\u53d6\u5f97 point:32730 partition_id:7<\/li>\n<li> \u4e0a\u4f4d\u533a\u9593\u4eba\u6570\u306e\u5408\u8a08 245+132+144+1561+1244+1309= 4635(\u4eba)<\/li>\n<li> \u540c\u3058\u533a\u9593\u3067\u5f97\u70b9\u304c\u9ad8\u3044\u4eba\u6570\u3092\u6c42\u3081\u308b SELECT COUNT(point) FROM user_point WHERE point BETWEEN 32730 AND 40000 (\u4eee\u3067\u4e0a\u306e\u30af\u30a8\u30ea\u30fc\u767a\u884c\u306740\u4eba\u3044\u305f\u3068\u3057\u307e\u3059\uff09<\/li>\n<li> \u9806\u4f4d\u3092\u6c42\u3081\u308b 4635 + 40 + 1 = 4676 (\u4f4d)<\/li>\n<\/ol>\n<p>\u4e0a\u306e\u3088\u3046\u306a\u51e6\u7406\u3092\u884c\u3063\u305f\u5834\u5408\u3001MySQL\u7684\u306b\u306a\u306b\u304c\u6539\u5584\u3055\u308c\u308b\u304b\u3092\u898b\u3066\u307f\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"superpre \">\n\u5358\u7d14\u306a\u30af\u30a8\u30ea\u30fc\u306e\u5834\u5408\nmysql> explain SELECT COUNT(point) FROM user_point WHERE 32730 < point ;\n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n| id | select_type | table      | type  | possible_keys | key   | key_len | ref  | rows | Extra                    |\n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n|  1 | SIMPLE      | user_point | range | point         | point | 4       | NULL | 3846 | Using where; Using index | \n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n1 row in set (0.00 sec)\n\n\u5f97\u70b9\u533a\u5206\u3092\u7528\u3044\u305f\u30e9\u30f3\u30ad\u30f3\u30b0\u306e\u5834\u5408\nmysql> explain SELECT COUNT(point) FROM user_point WHERE point BETWEEN 32730 AND 40000;\n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n| id | select_type | table      | type  | possible_keys | key   | key_len | ref  | rows | Extra                    |\n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n|  1 | SIMPLE      | user_point | range | point         | point | 4       | NULL |  130 | Using where; Using index | \n+----+-------------+------------+-------+---------------+-------+---------+------+------+--------------------------+\n1 row in set (0.00 sec)<\/pre>\n<p>\u3063\u3068\u3044\u3063\u305f\u5177\u5408\u306b\u3001\u6761\u4ef6\u3092\u8a2d\u3051\u305f\u3053\u3068\u306b\u3088\u308a\u30b9\u30ad\u30e3\u30f3\u3059\u308brows\u304c\u6e1b\u308a\u8ca0\u8377\u306e\u8efd\u6e1b\u304c\u898b\u8fbc\u3081\u305d\u3046\u3067\u3059\u3002<\/p>\n<h3 id=\"hs_e64cd21422eff1984954517ea1570fa0_header_5\"> 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