\u3053\u3093\u306b\u3061\u308f\u3002\u305b\u3058\u307e\u3067\u3059\u3002\u4eca\u56de\u306f\u5730\u5473\u3067\u6ce5\u81ed\u3044\u8a71\u3092\u3057\u307e\u3059\u3002\u305f\u3060\u3001\u5272\u3068\u5e73\u6613\u306a\u5185\u5bb9\u304b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u521d\u5b66\u8005\u306e\u65b9\u306b\u3082\u30aa\u30b9\u30b9\u30e1\u3067\u3059\u3002<\/p>\n
\u30b2\u30fc\u30e0\u3067\u306f\u3001\u53d7\u53d6\u671f\u9650\u306e\u3064\u3044\u305f\u30ed\u30b0\u30a4\u30f3\u30dc\u30fc\u30ca\u30b9\u7684\u306a\u3082\u306e\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002\u30e6\u30fc\u30b6\u304c\u671f\u9650\u307e\u3067\u306b\u53d7\u3051\u53d6\u3089\u306a\u3044\u3068\u3001\u30e6\u30fc\u30b6\u304b\u3089\u305d\u306e\u30c7\u30fc\u30bf\u306f\u4e0d\u53ef\u8996\u306b\u306a\u308a\u307e\u3059\u304c\u3001\u5fc5\u305a\u3057\u3082\u3001\u4e0d\u53ef\u8996\u306b\u306a\u3063\u305f\u77ac\u9593\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u304b\u3089\u76f4\u3061\u306b\u524a\u9664\u3055\u308c\u308b\u3001\u3068\u3044\u3046\u308f\u3051\u3067\u3082\u3042\u308a\u307e\u305b\u3093\u3002\u30d0\u30c3\u30c1\u30b8\u30e7\u30d6\u304b\u4f55\u304b\u3067\u3001\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u3088\u3046\u306b\u524a\u9664\u3059\u308b\u30b1\u30fc\u30b9\u304c\u591a\u3044\u306e\u3067\u306f\u306a\u3044\u3067\u3057\u3087\u3046\u304b\u3002<\/p>\n
\u307e\u305f\u3001\u8ad6\u7406\u524a\u9664\u3068\u3044\u3046\u6982\u5ff5\u3082\u3042\u308a\u307e\u3059\u3002\u8ad6\u7406\u524a\u9664\u306b\u3064\u3044\u3066\u306f\u3044\u308d\u3044\u308d\u610f\u898b\u3084\u8003\u3048\u65b9\u304c\u3042\u308b\u304b\u3068\u601d\u3044\u307e\u3059\u306e\u3067\u3001\u3053\u3053\u3067\u305d\u308c\u306b\u3064\u3044\u3066\u306f\u8ad6\u3058\u307e\u305b\u3093\u304c\u3001\u300c\u524a\u9664\u30d5\u30e9\u30b0\u304c\u7acb\u3063\u3066\u30e6\u30fc\u30b6\u304b\u3089\u4e0d\u53ef\u8996\u306b\u306a\u3063\u305f\u5f8c\u3001\u4e09\u30f6\u6708\u4ee5\u4e0a\u7d4c\u904e\u3057\u305f\u30c7\u30fc\u30bf\u3092\u524a\u9664\u3057\u305f\u3044\u300d\u307f\u305f\u3044\u306a\u3053\u3068\u306f\u3001\u30b2\u30fc\u30e0\u306b\u9650\u3089\u305a\u3001\u3057\u3070\u3057\u3070\u3042\u308b\u3093\u3058\u3083\u306a\u3044\u304b\u306a\u3068\u601d\u3044\u307e\u3059\u3002<\/p>\n
\u3053\u3046\u3044\u3063\u305f\u3001\u30e6\u30fc\u30b6\u304b\u3089\u4e0d\u53ef\u8996\u306b\u306a\u3063\u3066\u3057\u3070\u3089\u304f\u7d4c\u904e\u3057\u305f\u30c7\u30fc\u30bf\u3092\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u84c4\u7a4d\u3057\u7d9a\u3051\u308b\u3068\u3001\u30b9\u30c8\u30ec\u30fc\u30b8\u306e\u4f7f\u7528\u91cf\u304c\u5897\u3048\u3066\u3044\u3063\u305f\u308a\u3001MySQL\u7684\u306b\u306fRows_examined\u304c\u5897\u3048\u305f\u308a\u3001 buffer pool \u306b\u30c6\u30fc\u30d6\u30eb\u304c\u53ce\u307e\u3089\u306a\u304f\u306a\u3063\u305f\u308a\u3068\u3001\u69d8\u3005\u306a\u30c7\u30e1\u30ea\u30c3\u30c8\u304c\u767a\u751f\u3057\u305f\u308a\u3082\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u53e4\u3044\u6d88\u305b\u308b\u30c7\u30fc\u30bf\u306f\u524a\u9664\u3057\u305f\u65b9\u304c\u826f\u3044\u3067\u3059\u3088\u306d\u3001\u3068\u3044\u3063\u305f\u610f\u3067\u3001\u6b21\u306e\u30b9\u30e9\u30a4\u30c9<\/a>\u3067\u3082\u66f8\u304b\u305b\u3066\u3044\u305f\u3060\u304d\u307e\u3057\u305f\u3002<\/p>\n \u3067\u306f\u3053\u3046\u3044\u3063\u305f\u3068\u304d\u3001\u3069\u306e\u3088\u3046\u306a\u3053\u3068\u3092\u8003\u3048\u306a\u304c\u3089\u6d88\u3057\u3066\u884c\u3051\u3070\u3088\u3044\u306e\u304b\u3001\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3092\u5165\u308c\u305a\u3001\u30e6\u30fc\u30b6\u306b\u3082\u5f71\u97ff\u3092\u4e0e\u3048\u306a\u3044\u3088\u3046\u306b\u3057\u306a\u304c\u3089\u524a\u9664\u3057\u3066\u3044\u304f\u306b\u306f\u3069\u3046\u3059\u308c\u3070\u3088\u3044\u306e\u304b\u3001\u793e\u5185\u5411\u3051\u306b\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u66f8\u3053\u3046\u304b\u3068\u601d\u3063\u305f\u306e\u3067\u3059\u304c\u3001\u793e\u5185\u306b\u7559\u307e\u3089\u305a\u793e\u5916\u306b\u5411\u3051\u3066\u516c\u958b\u3057\u3066\u3082\u826f\u3044\u3093\u3058\u3083\u306a\u3044\u304b\u306a\u3068\u601d\u3063\u305f\u306e\u3067\u3001blog\u306b\u66f8\u304f\u3053\u3068\u306b\u3057\u307e\u3057\u305f\u3002<\/p>\n \u57fa\u672c\u7684\u306b\u306fMySQL\u3084Aurora MySQL\u306a\u3069\u3092\u524d\u63d0\u306b\u66f8\u304d\u307e\u3059\u304c\u3001\u4ed6\u306eRDBMS\u306a\u3069\u3067\u3082\u3001\u53c2\u8003\u306b\u306a\u308b\u304b\u3082\u3057\u308c\u307e\u305b\u3093\u3002<\/p>\n \u6b21\u306e\u3088\u3046\u306a\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n \u3042\u308b\u3044\u306f\u3001\u6b21\u306e\u3088\u3046\u306a\u30c6\u30fc\u30d6\u30eb\u304c\u3042\u308b\u3068\u3057\u307e\u3059\u3002<\/p>\n \u3053\u308c\u3089\u306e\u30c6\u30fc\u30d6\u30eb\u3067\u3001 \u9577\u3005\u3068\u8aad\u3080\u306e\u306f\u624b\u9593\u3067\u3057\u3087\u3046\u304b\u3089\u3001\u6700\u521d\u306b\u307e\u3068\u3081\u3092\u66f8\u3044\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n\n\t\t\t\t\t\t\t\tClient Challenge<\/a>
\n\t\t\t\t\t\t\t<\/h5>\n
\n\t\t\t\t\t\t\t\t\t\t\t\t\t\t\t\thttp:\/\/www.slideshare.net\t\t\t\t\t\t\t<\/a>\n\t\t\t\t\t\t<\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n\u30c6\u30fc\u30d6\u30eb\u5b9a\u7fa9<\/h2>\n
\nmysql> show create table sejima\\G\n*************************** 1. row ***************************\n Table: sejima\nCreate Table: CREATE TABLE `sejima` (\n `id` bigint NOT NULL AUTO_INCREMENT,\n `value` varchar(255) DEFAULT NULL,\n `created_at` datetime NOT NULL,\n `updated_at` timestamp NOT NULL,\n PRIMARY KEY (`id`)\n) ENGINE=InnoDB AUTO_INCREMENT=458728 DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci\n1 row in set (0.00 sec)\n\nmysql> select min(id),max(id),count(*) from sejima;\n+---------+---------+----------+\n| min(id) | max(id) | count(*) |\n+---------+---------+----------+\n| 1 | 409578 | 294912 |\n+---------+---------+----------+\n1 row in set (0.01 sec)\n\nmysql>\n<\/pre>\n
\nmysql> show create table sejima2\\G\n*************************** 1. row ***************************\n Table: sejima2\nCreate Table: CREATE TABLE `sejima2` (\n `user_id` bigint NOT NULL,\n `item_id` int NOT NULL,\n `value` varchar(255) DEFAULT NULL,\n `created_at` datetime NOT NULL,\n `updated_at` timestamp NOT NULL,\n PRIMARY KEY (`user_id`,`item_id`)\n) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_0900_ai_ci\n1 row in set (0.00 sec)\n\nmysql> select min(user_id),max(user_id),count(*) from sejima2;\n+--------------+--------------+----------+\n| min(user_id) | max(user_id) | count(*) |\n+--------------+--------------+----------+\n| 1 | 409578 | 1179648 |\n+--------------+--------------+----------+\n1 row in set (0.04 sec)\n\nmysql>\n<\/pre>\n
updated_at<\/code> \u304c\u3042\u308b\u7a0b\u5ea6\u53e4\u3044\u3082\u306e\u3092\u6d88\u3057\u3066\u3044\u304f\u30b1\u30fc\u30b9\u3092\u8003\u3048\u3066\u307f\u307e\u3059\u3002<\/p>\n\u5148\u305a\u306f\u307e\u3068\u3081<\/h2>\n
PRIMARY KEY \u304c AUTO_INCREMENT \u306e\u5834\u5408<\/h3>\n
\n
SELECT MIN(id), MAX(id) FROM sejima;<\/code> \u3067id\u306e\u4e0b\u9650\u3068\u4e0a\u9650\u3092\u8abf\u3079\u308b\u3002<\/li>\n\n
SELECT id FROM sejima WHERE id BETWEEN ${min_id} AND ${min_id}+${delta}\/10 AND updated_at < ? LIMIT ?;<\/code>\n\n
\n
DELETE FROM sejima WHERE id IN (...,) AND updated_at < ?;<\/code>\n\n
\n
\n
SELECT id FROM sejima WHERE id BETWEEN ${min_id}+${delta}\/10)+1 AND ${min_id}+(${delta}\/10)*2 AND updated_at < ? LIMIT ?;<\/code> \u306a\u3069<\/li>\nSELECT id FROM sejima WHERE id BETWEEN ${min_id}+(${delta}\/10)*9)+1 AND ${max_id} AND updated_at < ? LIMIT ?;<\/code> \u307e\u3067\u7e70\u308a\u8fd4\u3059<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ol>\nPRIMARY KEY \u304c\u8907\u5408\u30ad\u30fc\u306e\u5834\u5408<\/h3>\n
\n
SELECT MIN(user_id), MAX(user_id) FROM sejima2;<\/code> \u3067 user_id\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5de6\u7aef\u306e\u30d7\u30ea\u30d5\u30a3\u30af\u30b9\uff09\u306e\u4e0b\u9650\u3068\u4e0a\u9650\u3092\u8abf\u3079\u308b\u3002\n\n
\n
SELECT user_id, item_id FROM sejima2 WHERE user_id BETWEEN ${min_id} AND ${min_id}+${delta}\/10 AND updated_at < ? LIMIT ?;<\/code>\n\n
\n
\n
DELETE FROM sejima2 WHERE (user_id,item_id) IN ((?,?),(?,?),(?,?),(?,?)...,) AND updated_at < ?;<\/code><\/li>\n<\/ul>\n<\/li>\n