{"id":20930,"date":"2026-08-23T15:05:18","date_gmt":"2026-08-23T13:05:18","guid":{"rendered":"https:\/\/webhosting.de\/mariadb-query-optimizer-intern-erklaert-sql-tuning-insight\/"},"modified":"2026-08-23T15:05:18","modified_gmt":"2026-08-23T13:05:18","slug":"mariadb-%e3%82%af%e3%82%a8%e3%83%aa%e3%82%aa%e3%83%97%e3%83%86%e3%82%a3%e3%83%9e%e3%82%a4%e3%82%b6%e3%83%bc%e3%81%ae%e5%86%85%e9%83%a8%e6%a7%8b%e9%80%a0%e8%a7%a3%e8%aa%ac%ef%bc%9asql%e3%83%81%e3%83%a5","status":"publish","type":"post","link":"https:\/\/webhosting.de\/ja\/mariadb-query-optimizer-intern-erklaert-sql-tuning-insight\/","title":{"rendered":"MariaDB \u30af\u30a8\u30ea\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u306e\u5185\u90e8\u69cb\u9020\u89e3\u8aac\uff1a\u57fa\u790e\u3001\u5b9f\u884c\u30d7\u30e9\u30f3\u3001\u5b9f\u8df5"},"content":{"rendered":"<p>\u79c1\u304c\u8aac\u660e\u3059\u308b\u306e\u306f\u3001 <strong>MariaDB \u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6<\/strong> \u5b9f\u52d9\u304b\u3089\u306e\u4e8b\u4f8b\uff1a\u5f7c\u304c\u3069\u306e\u3088\u3046\u306b\u5b9f\u884c\u30d7\u30e9\u30f3\u3092\u69cb\u7bc9\u3057\u3001\u30b3\u30b9\u30c8\u3092\u898b\u7a4d\u3082\u308a\u3001\u306a\u305c\u6642\u3005\u898b\u5f53\u9055\u3044\u306b\u306a\u308b\u306e\u304b\u3002\u3053\u308c\u306b\u3088\u308a\u3001SQL\u5b9f\u884c\u30d7\u30e9\u30f3\u3092\u7684\u78ba\u306b\u8aad\u307f\u89e3\u304d\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u9069\u5207\u306b\u6d3b\u7528\u3057\u3001\u76f4\u611f\u3067\u306f\u306a\u304f\u4e8b\u5b9f\u306b\u57fa\u3065\u3044\u3066\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u3092\u8a98\u5c0e\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n<h2>\u4e2d\u5fc3\u70b9<\/h2>\n\n<p>\u307e\u305a\u5192\u982d\u3067\u3001\u6700\u3082\u91cd\u8981\u306a\u69cb\u6210\u8981\u7d20\u3092\u7c21\u6f54\u306b\u307e\u3068\u3081\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8aad\u8005\u306e\u7686\u3055\u3093\u304c\u4ee5\u964d\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3092\u7684\u78ba\u306b\u7406\u89e3\u3057\u3001 <strong>\u6982\u8981<\/strong> \u4fdd\u6301\u3059\u308b\u3002.<\/p>\n<ul>\n  <li><strong>\u30d5\u30a7\u30fc\u30ba<\/strong>: \u89e3\u6790\u3001\u6e96\u5099\u3001\u6700\u9069\u5316\u3001\u5b9f\u884c\u306f\u3001\u3042\u3089\u3086\u308b\u30af\u30a8\u30ea\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb\u3092\u69cb\u6210\u3057\u3066\u3044\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb<\/strong>: \u30de\u30a4\u30af\u30ed\u79d2\u5358\u4f4d\u306e\u6642\u9593\u30d9\u30fc\u30b9\u306e\u5024\u304c\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u9078\u629e\u3001\u30b9\u30ad\u30e3\u30f3\u3001\u304a\u3088\u3073\u7d50\u5408\u306e\u9806\u5e8f\u3092\u5236\u5fa1\u3057\u307e\u3059\u3002.<\/li>\n  <li><strong>\u7d71\u8a08\u60c5\u5831<\/strong>: \u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3068\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u306f\u3001\u9078\u629e\u6027\u306e\u63a8\u5b9a\u3092\u6c7a\u5b9a\u3065\u3051\u308b\u3002.<\/li>\n  <li><strong>\u900f\u660e\u6027<\/strong>: EXPLAIN\u3001EXPLAIN ANALYZE\u3001\u304a\u3088\u3073Optimizer Trace\u306f\u3001\u30d6\u30e9\u30c3\u30af\u30dc\u30c3\u30af\u30b9\u306e\u5185\u5074\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0<\/strong>: \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u30af\u30a8\u30ea\u306e\u30ea\u30e9\u30a4\u30c8\u3001ANALYZE TABLE\u3001\u304a\u3088\u3073\u30b3\u30b9\u30c8\u30d1\u30e9\u30e1\u30fc\u30bf\u304c\u51e6\u7406\u901f\u5ea6\u3092\u5411\u4e0a\u3055\u305b\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img fetchpriority=\"high\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/mariaDB-query-plans-9842.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>MariaDB\u306b\u304a\u3051\u308b\u30af\u30a8\u30ea\u306e\u30e9\u30a4\u30d5\u30b5\u30a4\u30af\u30eb<\/h2>\n\n<p>\u30d7\u30e9\u30f3\u304c\u7b56\u5b9a\u3055\u308c\u308b\u524d\u306b\u3001\u30af\u30a8\u30ea\u306f4\u3064\u306e\u6bb5\u968e\u3092\u7d4c\u307e\u3059\u304c\u3001\u79c1\u306f\u65e5\u5e38\u696d\u52d9\u306b\u304a\u3044\u3066\u3001\u4ee5\u4e0b\u306e\u76ee\u7684\u3067\u3053\u308c\u3089\u3092\u91cd\u70b9\u7684\u306b\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002 <strong>\u539f\u56e0<\/strong> \u51e6\u7406\u304c\u9045\u304f\u306a\u308b\u539f\u56e0\u3092\u7279\u5b9a\u3059\u308b\u3002\u30d1\u30fc\u30b7\u30f3\u30b0\u306e\u969b\u3001MariaDB\u306fSQL\u3092\u5185\u90e8\u69cb\u9020\u306b\u5909\u63db\u3059\u308b\u305f\u3081\u3001\u3053\u306e\u6bb5\u968e\u3067\u69cb\u6587\u30a8\u30e9\u30fc\u304c\u691c\u51fa\u3055\u308c\u308b\u3002\u6e96\u5099\u6bb5\u968e\u3067\u306f\u3001\u30a8\u30f3\u30b8\u30f3\u304c\u30c6\u30fc\u30d6\u30eb\u3001\u30ab\u30e9\u30e0\u3001\u304a\u3088\u3073\u5019\u88dc\u3068\u306a\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u691c\u8a3c\u3057\u3001\u7c21\u5358\u306a\u5909\u63db\u3092\u884c\u3046\u3002 \u7d9a\u3044\u3066\u6700\u9069\u5316\u304c\u884c\u308f\u308c\u3001\u5019\u88dc\u3068\u306a\u308b\u5b9f\u884c\u8a08\u753b\u304c\u8a08\u7b97\u3055\u308c\u3001\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb\u3092\u7528\u3044\u3066\u8a55\u4fa1\u3055\u308c\u307e\u3059\u3002\u5b9f\u884c\u6bb5\u968e\u3067\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306f\u9078\u629e\u3055\u308c\u305f\u5b9f\u884c\u8a08\u753b\u3092\u6bb5\u968e\u7684\u306b\u5b9f\u884c\u3057\u307e\u3059\u3002\u5177\u4f53\u7684\u306b\u306f\u3001\u8aad\u307f\u53d6\u308a\u3001\u7d50\u5408\u3001\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3001\u8fd4\u5374\u3068\u3044\u3046\u9806\u5e8f\u3067\u884c\u308f\u308c\u307e\u3059\u3002.<\/p>\n\n<p>\u79c1\u306f\u89e3\u6790\u30a8\u30e9\u30fc\u3092\u30d5\u30a7\u30fc\u30ba\u3054\u3068\u306b\u660e\u78ba\u306b\u5206\u985e\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u539f\u56e0\u306e\u7279\u5b9a\u304c\u3088\u308a\u8fc5\u901f\u306b\u9032\u307f\u3001 <strong>\u5bfe\u7b56<\/strong> \u7684\u3092\u7d5e\u3063\u3066\u5bfe\u51e6\u3059\u308b\u3002\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u554f\u984c\u306f\u3001\u305f\u3044\u3066\u3044\u6700\u9069\u5316\u306b\u539f\u56e0\u304c\u3042\u308b\uff1a\u8aa4\u3063\u305f\u898b\u7a4d\u3082\u308a\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u6b20\u5982\u3001\u3042\u308b\u3044\u306f\u4e0d\u9069\u5207\u306a\u30b8\u30e7\u30a4\u30f3\u9806\u5e8f\u306a\u3069\u3060\u3002\u30d1\u30fc\u30b7\u30f3\u30b0\u30a8\u30e9\u30fc\u306f\u4e9b\u7d30\u306a\u3082\u306e\u3060\u304c\u3001\u30d7\u30ea\u30da\u30a2\u30ea\u30f3\u30b0\u306e\u6bb5\u968e\u3067\u306f\u3001\u30d3\u30e5\u30fc\u306e\u5c55\u958b\u3084\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u5909\u63db\u3068\u3044\u3063\u305f\u5de5\u592b\u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u3082\u3042\u308b\u3002 \u5b9f\u884c\u6bb5\u968e\u3067\u306f\u3001\u4e8b\u524d\u306b\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u304c\u9078\u629e\u3055\u308c\u3066\u3044\u305f\u5834\u5408\u3001\u975e\u52b9\u7387\u6027\u304c\u5bb9\u8d66\u306a\u304f\u9732\u5448\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u79c1\u306f\u8abf\u67fb\u306e\u305f\u3073\u306b\u3001\u3053\u308c\u30894\u3064\u306e\u6bb5\u968e\u3059\u3079\u3066\u3092\u4f53\u7cfb\u7684\u306b\u78ba\u8a8d\u3059\u308b\u3053\u3068\u304b\u3089\u59cb\u3081\u307e\u3059\u3002.<\/p>\n\n<h2>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u304c\u5185\u90e8\u3067\u3069\u306e\u3088\u3046\u306b\u5224\u65ad\u3059\u308b\u304b<\/h2>\n\n<p>MariaDB\u306f\u30b3\u30b9\u30c8\u30d9\u30fc\u30b9\u3067\u52d5\u4f5c\u3057\u3001 <strong>\u30b3\u30b9\u30c8\u95a2\u6570<\/strong>. \u5404\u30d0\u30ea\u30a8\u30fc\u30b7\u30e7\u30f3\u306b\u3064\u3044\u3066\u3001\u30b5\u30fc\u30d0\u30fc\u306f\u8aad\u307f\u8fbc\u307e\u308c\u308b\u884c\u6570\u3001WHERE\/ON\u306e\u9078\u629e\u6027\u3001\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30b9\u30ad\u30e3\u30f3\u3001\u30ec\u30f3\u30b8\u30b9\u30ad\u30e3\u30f3\u3068\u3044\u3063\u305f\u30a2\u30af\u30bb\u30b9\u7a2e\u5225\u3001\u304a\u3088\u3073\u500b\u3005\u306e\u64cd\u4f5c\u306b\u304b\u304b\u308b\u6642\u9593\u3092\u63a8\u5b9a\u3057\u307e\u3059\u3002 \u5185\u90e8\u7684\u306b\u306f\u3001\u30b5\u30fc\u30d0\u30fc\u306f`join_preparation`\u3068`join_optimization`\u3092\u533a\u5225\u3057\u3066\u3044\u307e\u3059\u3002`join_preparation`\u3067\u306f\u3001\u30af\u30a8\u30ea\u306e\u66f8\u304d\u63db\u3048\u3001\u6761\u4ef6\u306e\u7c21\u7565\u5316\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306e\u5909\u63db\u3001\u304a\u3088\u3073\u30d3\u30e5\u30fc\u306e\u5c55\u958b\u304c\u884c\u308f\u308c\u307e\u3059\u3002 join_optimization\u3067\u306f\u3001\u7d50\u5408\u9806\u5e8f\u3092\u8a08\u7b97\u3057\u3001ref_optimizer_key_uses\u3092\u4ecb\u3057\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5019\u88dc\u3092\u691c\u8a3c\u3057\u3001\u7bc4\u56f2\u30b9\u30ad\u30e3\u30f3\u3092\u901a\u3058\u3066\u884c\u6570\u3092\u63a8\u5b9a\u3057\u3001\u6761\u4ef6\u3092\u53ef\u80fd\u306a\u9650\u308a\u65e9\u3044\u6bb5\u968e\u3067\u5177\u4f53\u7684\u306a\u30c6\u30fc\u30d6\u30eb\u306b\u5272\u308a\u5f53\u3066\u307e\u3059\u3002.<\/p>\n\n<p>\u3053\u306e\u4ed5\u7d44\u307f\u306b\u3088\u3063\u3066\u3001\u5c0f\u3055\u306a\u30d5\u30a3\u30eb\u30bf\u30fc\u304c\u9593\u9055\u3063\u305f\u5834\u6240\u306b\u8a2d\u7f6e\u3055\u308c\u3066\u3044\u308b\u3060\u3051\u3067\u3001\u306a\u305c\u9ad8\u4fa1\u306a <strong>\u7d50\u679c<\/strong> \u304c\u3042\u308b\u3002attaching_conditions_to_tables \u306e\u51e6\u7406\u304c\u9045\u308c\u3066\u884c\u308f\u308c\u308b\u3068\u3001\u5b9f\u884c\u8a08\u753b\u306f\u4e0d\u5fc5\u8981\u306b\u591a\u304f\u306e\u884c\u3092\u7d50\u5408\u51e6\u7406\u306b\u5f15\u304d\u305a\u308a\u8fbc\u3093\u3067\u3057\u307e\u3046\u3002\u7d71\u8a08\u60c5\u5831\u304c\u53e4\u304f\u306a\u3063\u3066\u3044\u308b\u5834\u5408\u3001rows_estimation \u3084 Selectivity \u306e\u5024\u304c\u8aa4\u3063\u305f\u3082\u306e\u3068\u306a\u308a\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306f\u4e00\u898b\u6709\u5229\u3060\u304c\u5b9f\u969b\u306b\u306f\u9045\u3044\u30a2\u30af\u30bb\u30b9\u30d1\u30b9\u3092\u63a1\u7528\u3057\u3066\u3057\u307e\u3046\u3002 \u79c1\u306f\u307e\u3055\u306b\u3053\u308c\u3089\u306e\u8abf\u6574\u70b9\u306b\u7740\u76ee\u3057\u3066\u3044\u307e\u3059\u3002\u3059\u306a\u308f\u3061\u3001\u3088\u308a\u6b63\u78ba\u306a\u7d71\u8a08\u60c5\u5831\u3001\u3088\u308a\u660e\u78ba\u306a\u8ff0\u8a9e\u3001\u9069\u5207\u306b\u30bd\u30fc\u30c8\u3055\u308c\u305f\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u3059\u3002\u3053\u308c\u3089\u3092\u6539\u5584\u3059\u308b\u3068\u3001\u5b9f\u884c\u30d7\u30e9\u30f3\u306e\u9078\u629e\u304c\u9855\u8457\u306b\u5909\u5316\u3059\u308b\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/MariaDBQueryOptKonferenz1234.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>MariaDB 11.0\u4ee5\u964d\u306e\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb<\/h2>\n\n<p>\u6700\u65b0\u306e\u30ea\u30ea\u30fc\u30b9\u3067\u306f\u3001\u4f5c\u696d\u306e\u8a55\u4fa1\u3092\u5927\u307e\u304b\u306a\u91cd\u307f\u4ed8\u3051\u3067\u306f\u306a\u304f\u3001\u6b21\u306e\u3088\u3046\u306b\u884c\u3063\u3066\u3044\u307e\u3059\u3002 <strong>\u30de\u30a4\u30af\u30ed\u79d2<\/strong> \u5177\u4f53\u7684\u306a\u30b9\u30c8\u30ec\u30fc\u30b8\u64cd\u4f5c\u306b\u5bfe\u3057\u3066\u3002optimizer_disk_read_cost\u3001optimizer_disk_read_ratio\u3001optimizer_where_cost \u3068\u3044\u3063\u305f\u30d1\u30e9\u30e1\u30fc\u30bf\u306b\u3088\u308a\u3001\u30e2\u30c7\u30eb\u306f\u5b9f\u969b\u306e\u5b9f\u884c\u6642\u9593\u306b\u3055\u3089\u306b\u8fd1\u3065\u304d\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306f\u5b9f\u969b\u306e\u6642\u9593\u60f3\u5b9a\u306b\u57fa\u3065\u3044\u3066\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fb\u30ec\u30f3\u30b8\u30fb\u30b9\u30ad\u30e3\u30f3\u3068\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u6bd4\u8f03\u3057\u307e\u3059\u3002 LAST_QUERY_COST \u306f\u63a8\u5b9a\u7dcf\u30b3\u30b9\u30c8\u3092\u8868\u793a\u3057\u3001\u4ee5\u524d\u3088\u308a\u3082\u73fe\u5b9f\u3068\u306e\u76f8\u95a2\u6027\u304c\u5927\u5e45\u306b\u5411\u4e0a\u3057\u3066\u3044\u307e\u3059\u3002\u30c7\u30fc\u30bf\u96c6\u7d04\u578b\u30b7\u30b9\u30c6\u30e0\u306b\u304a\u3044\u3066\u306f\u3001\u3053\u306e\u3088\u308a\u304d\u3081\u7d30\u304b\u306a\u8a55\u4fa1\u57fa\u6e96\u304c\u5373\u5ea7\u306b\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002.<\/p>\n\n<p>\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306e\u7279\u6027\u304c\u6a19\u6e96\u7684\u306a\u4eee\u5b9a\u3068\u76f8\u53cd\u3057\u3001\u305d\u306e\u7d50\u679c\u3001 <strong>\u30d7\u30e9\u30f3\u9078\u629e<\/strong> \u6b6a\u3081\u308b\u3002NVMe SSD\u3001\u5206\u6563\u30b9\u30c8\u30ec\u30fc\u30b8\u3001\u3042\u308b\u3044\u306f\u5c02\u7528\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u306f\u3001\u30c7\u30a3\u30b9\u30af\u6bd4\u7387\u3084\u8aad\u307f\u53d6\u308a\u6642\u9593\u3092\u8457\u3057\u304f\u5909\u5316\u3055\u305b\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002optimizer_costs \u3092\u308f\u305a\u304b\u306b\u8abf\u6574\u3059\u308b\u3060\u3051\u3067\u3001MariaDB \u306f\u9069\u5207\u306a\u5b9f\u884c\u30d1\u30b9\u3092\u512a\u5148\u3059\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002 \u79c1\u306f\u5909\u66f4\u70b9\u3092\u3059\u3079\u3066\u8a18\u9332\u3057\u3001\u305d\u306e\u5f8c EXPLAIN ANALYZE \u3092\u78ba\u8a8d\u3057\u3066\u305d\u306e\u5f71\u97ff\u3092\u6e2c\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u6e2c\u5b9a\u3092\u884c\u308f\u306a\u3051\u308c\u3070\u3001\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306f\u8ced\u3051\u4e8b\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u9078\u629e\u6027\u3001\u7d71\u8a08\u3001\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0<\/h2>\n\n<p>\u6b63\u78ba\u306a\u63a8\u5b9a\u306f\u3001\u6b63\u78ba\u306a <strong>\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3<\/strong> \u305d\u3057\u3066\u4fe1\u983c\u6027\u306e\u9ad8\u3044\u9078\u629e\u6027\u3002MariaDB\u306f\u5217\u3054\u3068\u306e\u3055\u307e\u3056\u307e\u306a\u5024\u306b\u95a2\u3059\u308b\u7d71\u8a08\u60c5\u5831\u3092\u4fdd\u6301\u3057\u3066\u304a\u308a\u3001\u30aa\u30d7\u30b7\u30e7\u30f3\u3067\u5206\u5e03\u306e\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3082\u53ef\u80fd\u3067\u3059\u3002 \u7279\u306b\u3001\u4e0d\u5747\u4e00\u306a\u30c7\u30fc\u30bf\uff08\u30db\u30c3\u30c8\u30b9\u30dd\u30c3\u30c8\u3001\u30b8\u30c3\u30d7\u5206\u5e03\u3001\u5b63\u7bc0\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u306a\u3069\uff09\u306f\u3001\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u306e\u6069\u6075\u3092\u53d7\u3051\u307e\u3059\u3002\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u5909\u66f4\u3092\u884c\u3063\u305f\u5f8c\u306f\u3001\u6700\u9069\u5316\u304c\u5b9f\u969b\u306e\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u52d5\u4f5c\u3059\u308b\u3088\u3046\u306b\u3001ANALYZE TABLE\u3092\u5b9f\u884c\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u3092\u5fd8\u308c\u308b\u3068\u3001\u5ba2\u89b3\u7684\u306b\u898b\u3066\u8aa4\u3063\u305f\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u304c\u884c\u308f\u308c\u308b\u30ea\u30b9\u30af\u304c\u3042\u308a\u307e\u3059\u3002.<\/p>\n\n<p>ANALYZE\u3092\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u306b\u5408\u308f\u305b\u3066\u5b9a\u671f\u30b8\u30e7\u30d6\u3068\u3057\u3066\u8a2d\u5b9a\u3059\u308b\u4e88\u5b9a\u3067\u3059\u3002 <strong>\u5909\u66f4\u70b9<\/strong> \u30c7\u30fc\u30bf\u91cf\u304a\u3088\u3073\u91cd\u8981\u306a\u30c6\u30fc\u30d6\u30eb\u306b\u304a\u3044\u3066\u3002\u5217\u306e\u5206\u5e03\u304c\u5927\u304d\u304f\u6b6a\u3093\u3067\u3044\u308b\u5834\u5408\u3001\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u306f\u7279\u7570\u5024\u306e\u9078\u629e\u6027\u3092\u73fe\u5b9f\u7684\u306b\u628a\u63e1\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002 \u3053\u308c\u306b\u3088\u308a\u3001\u30ec\u30f3\u30b8\u30b9\u30ad\u30e3\u30f3\u3084\u30de\u30fc\u30b8\u6226\u7565\u306b\u304a\u3051\u308b\u8aa4\u3063\u305f\u8a55\u4fa1\u304c\u8efd\u6e1b\u3055\u308c\u307e\u3059\u3002\u9069\u5207\u306a\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u30d2\u30c3\u30c8\u7cbe\u5ea6\u304c\u5287\u7684\u306b\u5411\u4e0a\u3057\u307e\u3059\u3002\u305d\u306e\u7d50\u679c\u3001\u5b9f\u884c\u6642\u9593\u304c\u77ed\u7e2e\u3055\u308c\u3001I\/O\u3082\u524a\u6e1b\u3055\u308c\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/mariadb-query-optimizer-guide-4729.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>EXPLAIN \u304a\u3088\u3073\u5b9f\u884c\u8a08\u753b\u306e\u8aad\u307f\u65b9<\/h2>\n\n<p>\u6c7a\u5b9a\u5185\u5bb9\u3092\u53ef\u8996\u5316\u3059\u308b\u305f\u3081\u306b\u3001EXPLAIN\u3001EXPLAIN EXTENDED\u3001\u304a\u3088\u3073 <strong>FORMAT=JSON<\/strong>. \u6a19\u6e96\u7684\u306a\u30ab\u30e9\u30e0\u304b\u3089\u306f\u3001\u4e00\u76ee\u3067\u6982\u8981\u3092\u628a\u63e1\u3067\u304d\u307e\u3059\uff1aid\u3001select_type\u3001table\u3001type\u3001possible_keys\u3001key\u3001key_len\u3001ref\u3001rows\u3001\u304a\u3088\u3073\u5834\u5408\u306b\u3088\u3063\u3066\u306ffiltered\u3002 type=ALL \u306f\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u793a\u3057\u3066\u304a\u308a\u3001\u3053\u308c\u306f\u307b\u3068\u3093\u3069\u671b\u307e\u3057\u304f\u306a\u3044\u3002FORMAT=JSON \u3067\u306f\u3001\u6761\u4ef6\u304c\u3069\u306e\u3088\u3046\u306b\u79fb\u52d5\u3055\u308c\u305f\u304b\u3001\u307e\u305f\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u304c\u3069\u306e\u30d1\u30b9\u3092\u8a55\u4fa1\u3057\u305f\u304b\u304c\u8a73\u7d30\u306b\u793a\u3055\u308c\u308b\u3002\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u6587\u8108\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u30ac\u30a4\u30c9\u3092\u53c2\u7167\u3059\u308b\u3053\u3068\u3092\u304a\u52e7\u3081\u3059\u308b\uff1a <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%81%ae%e3%82%af%e3%82%a8%e3%83%aa%e5%ae%9f%e8%a1%8c%e3%83%97%e3%83%a9%e3%83%b3%e3%80%81%e6%9c%80%e9%81%a9%e5%8c%96%e3%83%91%e3%83%95%e3%82%a9\/\">\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306b\u304a\u3051\u308b\u5b9f\u884c\u30d7\u30e9\u30f3<\/a>, \u3001\u8a08\u753b\u60c5\u5831\u3092\u30a4\u30f3\u30d5\u30e9\u306e\u5f71\u97ff\u3068\u95a2\u9023\u4ed8\u3051\u308b\u305f\u3081\u3002.<\/p>\n\n<p>\u7d20\u65e9\u304f\u89e3\u91c8\u3059\u308b\u305f\u3081\u306b\u3001\u5178\u578b\u7684\u306a\u5024\u3092\u7c21\u6f54\u306b\u307e\u3068\u3081\u305f\u5c0f\u3055\u306a\u8868\u304c\u5f79\u7acb\u3063\u3066\u304a\u308a\u3001\u305d\u308c\u306b\u3088\u3063\u3066 <strong>\u8aa4\u3063\u305f\u89e3\u91c8<\/strong> \u9632\u6b62\u3059\u308b\u3002.<\/p>\n\n<table>\n  <thead>\n    <tr>\n      <th>EXPLAIN\u30d5\u30a3\u30fc\u30eb\u30c9<\/th>\n      <th>\u4ee3\u8868\u5024<\/th>\n      <th>\u5b9f\u52d9\u306b\u304a\u3051\u308b\u610f\u7fa9<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>\u30bf\u30a4\u30d7<\/td>\n      <td>ALL\u3001range\u3001ref\u3001eq_ref\u3001const<\/td>\n      <td>\u53f3\u306b\u884c\u304f\u307b\u3069\u9078\u629e\u6027\u304c\u5f37\u304f\u306a\u308a\u3001\u300cALL\u300d\u306f\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u793a\u3059\u3002.<\/td>\n    <\/tr>\n    <tr>\n      <td>possible_keys<\/td>\n      <td>\u7d22\u5f15\u4e00\u89a7<\/td>\n      <td>\u7406\u8ad6\u7684\u306b\u9069\u5408\u3059\u308b\u6307\u6a19\u2015\u2015\u3053\u3053\u306b\u5019\u88dc\u304c\u6b20\u3051\u3066\u3044\u308c\u3070\u3001\u69cb\u9020\u3082\u6b20\u3051\u3066\u3044\u308b\u3053\u3068\u306b\u306a\u308b\u3002.<\/td>\n    <\/tr>\n    <tr>\n      <td>\u9470<\/td>\n      <td>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u540d<\/td>\n      <td>\u5b9f\u969b\u306b\u4f7f\u7528\u3055\u308c\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3002\u7a7a\u306e\u5834\u5408\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u306a\u3044\u3053\u3068\u3092\u610f\u5473\u3059\u308b\u3002.<\/td>\n    <\/tr>\n    <tr>\n      <td>\u884c<\/td>\n      <td>\u756a\u53f7<\/td>\n      <td>\u63a8\u5b9a\u8aad\u4e86\u884c\u6570\uff1b\u73fe\u5b9f\u3068\u5927\u304d\u304f\u4e56\u96e2\u3057\u3066\u3044\u308b\uff1d\u7d71\u8a08\u306e\u7cbe\u5ea6\u304c\u4f4e\u3044\u3002.<\/td>\n    <\/tr>\n    <tr>\n      <td>\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u6e08\u307f<\/td>\n      <td>\u30d1\u30fc\u30bb\u30f3\u30c8<\/td>\n      <td>\u30d5\u30a3\u30eb\u30bf\u30fc\u3092\u901a\u904e\u3057\u305f\u5f8c\u306e\u91cf\u304c\u3069\u308c\u304f\u3089\u3044\u304b\u3002\u5c11\u306a\u3044\u307b\u3069\u826f\u3044\u5834\u5408\u304c\u591a\u3044\u3002.<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n\n<h2>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u304c\u6642\u3005\u7684\u5916\u308c\u306b\u306a\u308b\u7406\u7531<\/h2>\n\n<p>\u3069\u306e\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb\u3082\u3042\u3089\u3086\u308b\u72b6\u6cc1\u306b\u5f53\u3066\u306f\u307e\u308b\u308f\u3051\u3067\u306f\u306a\u3044\u305f\u3081\u3001\u4fee\u6b63\u3057\u307e\u3059 <strong>\u5931\u6557<\/strong> \u7684\u3092\u7d5e\u3063\u3066\u3002\u53e4\u3044\u7d71\u8a08\u60c5\u5831\u306f\u3001\u884c\u6570\u306e\u8aa4\u3063\u305f\u63a8\u5b9a\u3084\u4e0d\u9069\u5207\u306a\u7d50\u5408\u9806\u5e8f\u306b\u3064\u306a\u304c\u308a\u307e\u3059\u3002 \u69cb\u6210\u304c\u4e0d\u9069\u5207\u306a\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u8907\u6570\u5217\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u6642\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5229\u7528\u3092\u59a8\u3052\u307e\u3059\u3002\u904e\u5ea6\u306b\u30cd\u30b9\u30c8\u3055\u308c\u305f\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u3001\u52b9\u679c\u7684\u306a\u30ea\u30e9\u30a4\u30c8\u3092\u56f0\u96e3\u306b\u3057\u3001\u30de\u30c6\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3092\u963b\u5bb3\u3057\u307e\u3059\u3002\u30d5\u30a3\u30eb\u30bf\u306e\u6b20\u843d\u3084\u8aa4\u89e3\u3092\u62db\u304f\u3088\u3046\u306a\u30d5\u30a3\u30eb\u30bf\u306f\u3001\u6709\u7528\u306a\u8ff0\u8a9e\u304c\u9069\u7528\u3055\u308c\u308b\u524d\u306b\u3001\u30a8\u30f3\u30b8\u30f3\u306b\u591a\u304f\u306e\u884c\u3092\u79fb\u52d5\u3055\u305b\u308b\u3053\u3068\u3092\u4f59\u5100\u306a\u304f\u3055\u305b\u307e\u3059\u3002.<\/p>\n\n<p>\u307e\u305a\u3001\u30af\u30a8\u30ea\u306e\u8a18\u8ff0\u304c <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/strong> \u5b9f\u969b\u306b\u6d3b\u7528\u3057\u3066\u3044\u308b\u306e\u306f\u3001\u5de6\u5074\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u898f\u5247\u3001\u9069\u5207\u306a\u30bd\u30fc\u30c8\u9806\u5e8f\u3001WHERE\u53e5\u3067\u306e\u5217\u306b\u5bfe\u3059\u308b\u95a2\u6570\u306e\u4f7f\u7528\u56de\u907f\u3067\u3059\u3002\u305d\u306e\u5f8c\u3001EXPLAIN ANALYZE\u3092\u78ba\u8a8d\u3057\u3001\u63a8\u5b9a\u5024\u304c\u5b9f\u969b\u306e\u7d50\u679c\u3068\u4e00\u81f4\u3057\u3066\u3044\u308b\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001ANALYZE TABLE\u3092\u5b9f\u884c\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30ea\u30e9\u30a4\u30c8\u3092\u884c\u3044\u307e\u3059\u3002 FORCE INDEX\u3084\u30d2\u30f3\u30c8\u306e\u4f7f\u7528\u306f\u3001\u5c06\u6765\u306e\u6700\u9069\u5316\u3092\u5236\u9650\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u3042\u304f\u307e\u3067\u6700\u5f8c\u306e\u624b\u6bb5\u3068\u3057\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/mariadboptimizer_2219.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u30c8\u30ec\u30fc\u30b9\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3059\u308b<\/h2>\n\n<p>EXPLAIN\u3060\u3051\u3067\u306f\u4e0d\u5341\u5206\u306a\u5834\u5408\u306f\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30c8\u30ec\u30fc\u30b9\u3092\u6709\u52b9\u306b\u3057\u3066\u3001\u6b21\u306e\u70b9\u3092\u8ffd\u8de1\u3057\u307e\u3059\u3002 <strong>\u6c7a\u65ad<\/strong> JSON\u30ed\u30b0\u5185\u3067\u3059\u3002\u305d\u3053\u3067\u306f\u3001\u3069\u306e\u30d7\u30e9\u30f3\u304c\u691c\u8a0e\u3055\u308c\u3001\u5374\u4e0b\u3055\u308c\u3001\u3042\u308b\u3044\u306f\u53d7\u3051\u5165\u308c\u3089\u308c\u305f\u304b\u3092\u78ba\u8a8d\u3067\u304d\u307e\u3059\u3002\u6761\u4ef6\u306e\u9069\u7528\u304c\u9045\u308c\u305f\u7406\u7531\u3084\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u5019\u88dc\u304b\u3089\u5916\u308c\u305f\u7406\u7531\u3082\u628a\u63e1\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u3053\u306e\u30ed\u30b0\u306b\u306f\u6761\u4ef6\u306e\u4e26\u3079\u66ff\u3048\u72b6\u6cc1\u3082\u8a18\u9332\u3055\u308c\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u8996\u70b9\u306f\u7406\u89e3\u3092\u6df1\u3081\u3001\u6b21\u56de\u306e\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306b\u5411\u3051\u305f\u5177\u4f53\u7684\u306a\u6539\u5584\u7b56\u3092\u793a\u3057\u3066\u304f\u308c\u307e\u3059\u3002.<\/p>\n\n<p>\u30c8\u30ec\u30fc\u30b9\u306e\u95a2\u9023\u3059\u308b\u90e8\u5206\u3092\u3001\u30af\u30a8\u30ea\u30cf\u30c3\u30b7\u30e5\u3068\u3068\u3082\u306b\u4fdd\u5b58\u3057\u3001 <strong>\u30d1\u30e9\u30e1\u30fc\u30bf<\/strong>\u8a18\u9332\u3057\u3066\u304a\u304f\u3002\u305d\u3046\u3059\u308c\u3070\u3001\u5f8c\u3067\u3069\u306e\u5909\u66f4\u304c\u3069\u306e\u3088\u3046\u306a\u52b9\u679c\u3092\u3082\u305f\u3089\u3057\u305f\u304b\u3092\u6bd4\u8f03\u3067\u304d\u308b\u3002MariaDB\u30b5\u30fc\u30d0\u30fc\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3084\u30a8\u30b3\u30b7\u30b9\u30c6\u30e0\u5185\u306e\u3055\u307e\u3056\u307e\u306a\u8b1b\u6f14\u3067\u306f\u3001\u3053\u308c\u3089\u306e\u30d5\u30a3\u30fc\u30eb\u30c9\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u8aac\u660e\u3055\u308c\u3066\u3044\u308b\uff08\u51fa\u5178\uff1aMariaDB\u30b5\u30fc\u30d0\u30fc\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u300c\u30af\u30a8\u30ea\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u300d\u304a\u3088\u3073\u300c\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u30c8\u30ec\u30fc\u30b9\u300d\uff09\u3002 \u3053\u306e\u30c4\u30fc\u30eb\u3092\u4f7f\u3048\u3070\u3001\u8a66\u884c\u932f\u8aa4\u3088\u308a\u3082\u65e9\u304f\u8aa4\u3063\u305f\u4eee\u5b9a\u3092\u898b\u3064\u3051\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u7279\u306b\u3001\u8907\u96d1\u306a\u7d50\u5408\u3092\u884c\u3046\u969b\u306b\u6642\u9593\u3092\u5927\u5e45\u306b\u7bc0\u7d04\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u5b9f\u8df5\uff1a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30fb\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7<\/h2>\n\n<p>\u79c1\u306f\u3001\u3042\u3089\u3086\u308b\u6700\u9069\u5316\u3092\u660e\u78ba\u306a <strong>\u6e2c\u5b9a<\/strong>. \u554f\u984c\u306e\u691c\u51fa\u306f\u3001\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0\u3068\u305d\u308c\u3092\u901a\u3058\u3066\u884c\u3063\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/mysql%e3%81%ae%e9%81%85%e3%81%84%e3%82%af%e3%82%a8%e3%83%aa%e3%83%ad%e3%82%b0%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0%e3%81%afqueryperf%e3%82%92%e5%88%86%e6%9e%90%e3%81%99%e3%82%8b\/\">\u9045\u3044\u30af\u30a8\u30ea\u30ed\u30b0<\/a>. \u3002\u305d\u306e\u5f8c\u3001EXPLAIN\u3068EXPLAIN ANALYZE\u3092\u6bd4\u8f03\u3057\u3001\u5b9f\u884c\u8a08\u753b\u3068\u5b9f\u969b\u306e\u7d50\u679c\u3092\u91cd\u306d\u5408\u308f\u305b\u3066\u78ba\u8a8d\u3057\u307e\u3059\u3002 \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u6226\u7565\u306f\u3001WHERE\u3001JOIN\u3001ORDER BY\u306b\u5408\u308f\u305b\u3066\u8abf\u6574\u3057\u307e\u3059\u3002\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u30a2\u30af\u30bb\u30b9\u983b\u5ea6\u306e\u9ad8\u3044\u7b87\u6240\u306b\u5408\u308f\u305b\u3066\u8a2d\u5b9a\u3057\u307e\u3059\u3002FORCE INDEX\u306f\u3001\u7d71\u8a08\u60c5\u5831\u304c\u6b63\u3057\u304f\u3066\u3082\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u304c\u8aa4\u3063\u305f\u5019\u88dc\u3092\u9078\u629e\u3057\u305f\u5834\u5408\u306b\u306e\u307f\u4f7f\u7528\u3057\u307e\u3059\u3002.<\/p>\n\n<p>\u3069\u306e\u30b9\u30c6\u30c3\u30d7\u306b\u3082\u3001\u4ee5\u4e0b\u306e\u30b1\u30a2\u304c\u6b20\u304b\u305b\u307e\u305b\u3093\u3002 <strong>\u7d71\u8a08\u60c5\u5831<\/strong>: \u30a2\u30af\u30bb\u30b9\u983b\u5ea6\u306e\u9ad8\u3044\u30c6\u30fc\u30d6\u30eb\u306b\u5bfe\u3059\u308b ANALYZE TABLE \u5b9f\u884c\u3001\u504f\u3063\u305f\u5206\u5e03\u306b\u5bfe\u3059\u308b\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u306e\u4f5c\u6210\u3002\u4e0d\u8981\u306a\u30b5\u30d6\u30af\u30a8\u30ea\u3092\u7c21\u7d20\u5316\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u4e2d\u9593\u7d50\u679c\u3092\u30de\u30c6\u30ea\u30a2\u30e9\u30a4\u30ba\u3057\u3001\u53e4\u3044\u30ef\u30fc\u30af\u30a2\u30e9\u30a6\u30f3\u30c9\u3092\u6574\u7406\u3057\u307e\u3059\u3002\u7279\u6b8a\u306a\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3092\u4f7f\u7528\u3059\u308b\u5834\u5408\u306f\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30b3\u30b9\u30c8\u3092\u78ba\u8a8d\u3057\u3001\u30de\u30a4\u30af\u30ed\u79d2\u5358\u4f4d\u306e\u30e2\u30c7\u30eb\u304c\u6b63\u3057\u3044\u3053\u3068\u3092\u4fdd\u8a3c\u3057\u307e\u3059\u3002 \u5909\u66f4\u306e\u90fd\u5ea6\u3001\u5909\u66f4\u524d\u5f8c\u306e\u5024\u3092\u8a18\u9332\u3057\u3001\u305d\u306e\u52b9\u679c\u3092\u9577\u671f\u7684\u306b\u8ffd\u8de1\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/mariadb_query_optimizer_8390.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u306e\u5178\u578b\u7684\u306a\u554f\u984c\u3068\u89e3\u6c7a\u7b56<\/h2>\n\n<p>possible_keys\u304c\u57cb\u307e\u3063\u3066\u3044\u308b\u306b\u3082\u304b\u304b\u308f\u3089\u305aEXPLAIN type=ALL\u304c\u8868\u793a\u3055\u308c\u308b\u5834\u5408\u3001\u307e\u305a\u4ee5\u4e0b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 <strong>\u9078\u629e\u6027<\/strong>. \u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5185\u306e\u5217\u9806\u5e8f\u304c\u9069\u5207\u3067\u306a\u3044\u5834\u5408\u3084\u3001\u95a2\u6570\u306e\u5f71\u97ff\u3067\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u5229\u7528\u3067\u304d\u306a\u3044\u3053\u3068\u304c\u3088\u304f\u3042\u308a\u307e\u3059\u3002 \u305d\u306e\u3088\u3046\u306a\u5834\u5408\u3001\u9806\u5e8f\u3092\u5165\u308c\u66ff\u3048\u305f\u308a\u3001\u554f\u984c\u3068\u306a\u308b\u95a2\u6570\u3092\u524a\u9664\u3057\u305f\u308a\u3001\u8ff0\u8a9e\u3092\u5206\u5272\u3057\u305f\u308a\u3057\u307e\u3059\u3002\u7d50\u5408\u9806\u5e8f\u304c\u4e0d\u9069\u5207\u306a\u5834\u5408\u306f\u3001\u9078\u629e\u6761\u4ef6\u306e\u53b3\u3057\u3044\u30c6\u30fc\u30d6\u30eb\u3092\u5148\u306b\u6301\u3063\u3066\u304f\u308b\u306a\u3069\u3001\u65e9\u671f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u304c\u53ef\u80fd\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u30b5\u30d6\u30af\u30a8\u30ea\u306b\u3064\u3044\u3066\u306f\u3001\u9069\u5207\u3067\u3042\u308c\u3070\u7d50\u5408\u3084TEMPORARY\u30c6\u30fc\u30d6\u30eb\u306b\u5909\u63db\u3057\u307e\u3059\u3002.<\/p>\n\n<p>\u79c1\u306f\u3001\u8457\u3057\u304f\u9038\u8131\u3057\u3066\u3044\u308b\u70b9\u304b\u3089\u3082\u3001\u8aa4\u3063\u305f\u5224\u65ad\u3092\u898b\u629c\u304f\u3053\u3068\u304c\u3067\u304d\u308b <strong>\u884c<\/strong> \u8a08\u753b\u3068\u73fe\u5b9f\u306e\u30ae\u30e3\u30c3\u30d7\u3002\u305d\u306e\u5834\u5408\u306f\u3001ANALYZE TABLE \u307e\u305f\u306f\u5bfe\u8c61\u306e\u5217\u306b\u5bfe\u3059\u308b\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002\u6b63\u3057\u3044\u7d71\u8a08\u60c5\u5831\u3067\u3082\u76ee\u7684\u304c\u9054\u6210\u3067\u304d\u306a\u3044\u5834\u5408\u306f\u3001\u660e\u793a\u7684\u306a\u30d2\u30f3\u30c8\u306e\u4f7f\u7528\u3092\u691c\u8a0e\u3057\u307e\u3059\u3002 \u305d\u306e\u524d\u306b\u3001\u30af\u30ed\u30b9\u30c1\u30a7\u30c3\u30af\u3068\u6e2c\u5b9a\u5024\u3092\u78ba\u5b9f\u306b\u8a18\u9332\u3057\u3066\u304a\u304d\u3001\u5f8c\u7d9a\u306e\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u304c\u3001\u4fdd\u5b58\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306b\u3088\u3063\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u4f4e\u4e0b\u3057\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002\u3053\u3053\u3067\u306e\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u4f5c\u6210\u306b\u304a\u3051\u308b\u5fb9\u5e95\u3057\u305f\u59ff\u52e2\u304c\u3001\u6700\u7d42\u7684\u306b\u5831\u308f\u308c\u308b\u306e\u3067\u3059\u3002.<\/p>\n\n<h2>\u30db\u30b9\u30c6\u30a3\u30f3\u30b0\u306e\u80cc\u666f\u3068\u904b\u7528\u4e0a\u306e\u5074\u9762<\/h2>\n\n<p>\u30af\u30a8\u30ea\u306e\u54c1\u8cea\u3068\u30a4\u30f3\u30d5\u30e9\u30b9\u30c8\u30e9\u30af\u30c1\u30e3\u306f\u4e92\u3044\u306b\u9069\u5408\u3057\u3066\u3044\u306a\u3051\u308c\u3070\u306a\u308a\u307e\u305b\u3093\u3002\u305d\u3046\u3067\u306a\u3051\u308c\u3070\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u4fa1\u5024\u304c\u53f0\u7121\u3057\u306b\u306a\u3063\u3066\u3057\u307e\u3044\u307e\u3059\u3002 <strong>\u30dd\u30c6\u30f3\u30b7\u30e3\u30eb<\/strong>. \u9ad8\u901f\u306aSSD\u3001\u4e00\u8cab\u6027\u306e\u3042\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u305d\u3057\u3066\u6574\u7136\u3068\u3057\u305f\u69cb\u6210\u306f\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u304c\u9069\u5207\u306a\u5224\u65ad\u3092\u4e0b\u3059\u305f\u3081\u306e\u57fa\u76e4\u3068\u306a\u308a\u307e\u3059\u3002\u30c8\u30e9\u30d5\u30a3\u30c3\u30af\u304c\u591a\u3044\u74b0\u5883\u3067\u306f\u30d5\u30eb\u30b9\u30ad\u30e3\u30f3\u306f\u8a31\u3055\u308c\u305a\u3001\u308f\u305a\u304b\u306a\u4e0d\u826f\u30af\u30a8\u30ea\u3067\u3082\u30b7\u30b9\u30c6\u30e0\u5168\u4f53\u306e\u52d5\u4f5c\u3092\u8457\u3057\u304f\u9045\u3089\u305b\u3066\u3057\u307e\u3044\u307e\u3059\u3002\u672c\u756a\u74b0\u5883\u306b\u304a\u3051\u308bMySQL\/MariaDB\u74b0\u5883\u5411\u3051\u306b\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u5b9f\u8df5\u7684\u306a\u30d2\u30f3\u30c8\u304c\u63d0\u4f9b\u3055\u308c\u3066\u3044\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/mysql-%e3%82%aa%e3%83%97%e3%83%86%e3%82%a3%e3%83%9e%e3%82%a4%e3%82%b6-%e3%82%af%e3%82%a8%e3%83%aa-%e3%83%9b%e3%82%b9%e3%83%86%e3%82%a3%e3%83%b3%e3%82%b0-%e6%9c%80%e9%81%a9%e5%8c%96-serverboost\/\">MySQL \u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc<\/a> \u8a08\u753b\u3068\u30d7\u30e9\u30c3\u30c8\u30d5\u30a9\u30fc\u30e0\u306e\u7d44\u307f\u5408\u308f\u305b\u306b\u95a2\u3059\u308b\u6709\u76ca\u306a\u793a\u5506\u3002\u3053\u306e\u5074\u9762\u3082\u8003\u616e\u306b\u5165\u308c\u308b\u3053\u3068\u3067\u3001\u30dc\u30c8\u30eb\u30cd\u30c3\u30af\u304c\u6df1\u523b\u5316\u3059\u308b\u524d\u306b\u672a\u7136\u306b\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<p>\u79c1\u306f\u5e38\u306b\u8a08\u753b\u5206\u6790\u3092\u3001\u4ee5\u4e0b\u306e\u6307\u6a19\u3068\u7d50\u3073\u3064\u3051\u3066\u3044\u307e\u3059 <strong>\u5165\u51fa\u529b<\/strong>, \u3001\u30ec\u30a4\u30c6\u30f3\u30b7\u3001\u304a\u3088\u3073\u4e26\u884c\u51e6\u7406\u3002\u5024\u304c\u60f3\u5b9a\u3057\u305f\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb\u3068\u4e00\u81f4\u3057\u306a\u3044\u5834\u5408\u306f\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u305d\u306e\u5f8c\u3001\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba\u3001\u4e26\u5217\u30ef\u30fc\u30af\u30ed\u30fc\u30c9\u3001\u304a\u3088\u3073\u30db\u30c3\u30c8\u30bb\u30c3\u30c8\u306e\u5206\u5e03\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002\u3053\u3046\u3057\u305f\u8996\u70b9\u3092\u6301\u3064\u3053\u3068\u3067\u3001\u30af\u30a8\u30ea\u3068\u30ea\u30bd\u30fc\u30b9\u3092\u8abf\u548c\u3055\u305b\u3066\u904b\u7528\u3057\u3001\u30d4\u30fc\u30af\u6642\u306e\u8ca0\u8377\u3092\u5236\u5fa1\u53ef\u80fd\u306a\u7bc4\u56f2\u306b\u6291\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u5b9f\u52d9\u306b\u304a\u3051\u308b\u7d50\u5408\u30d1\u30b9\u3068\u30a2\u30af\u30bb\u30b9\u30d1\u30b9<\/h2>\n\n<p>\u79c1\u306f\u3001\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u8aac\u660e\u3059\u308b\u3053\u3068\u3067\u3001\u591a\u304f\u306e\u8aa4\u89e3\u3092\u89e3\u3044\u3066\u3044\u307e\u3059\u3002 <strong>\u30a2\u30af\u30bb\u30b9\u65b9\u6cd5<\/strong> \u610f\u56f3\u7684\u306b\u6bd4\u8f03\u691c\u8a0e\u3059\u308b\u3002\u4e00\u3064\u306f <em>\u7bc4\u56f2<\/em>- \u307e\u305f\u306f <em>ref<\/em>-\u30a2\u30af\u30bb\u30b9\u306f\u307b\u307c\u5e38\u306b\u6210\u529f\u3059\u308b <em>ALL<\/em>. \u4e00\u610f\u30ad\u30fc\u306b\u57fa\u3065\u304f\u8ad6\u7406\u7d50\u5408\u306e\u5834\u5408\uff08<em>eq_ref<\/em>) \u3067\u306f\u3001\u8a08\u753b\u304c\u7279\u306b\u5b89\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001 <strong>\u30ab\u30d0\u30ec\u30c3\u30b8\u6307\u6570<\/strong> \u30af\u30a8\u30ea\u3092\u5b8c\u5168\u306b\u51e6\u7406\u3067\u304d\u308b\uff1a\u5fc5\u8981\u306a\u5217\u304c\u3059\u3079\u3066\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001MariaDB\u306f\u30b3\u30b9\u30c8\u306e\u304b\u304b\u308b\u30c6\u30fc\u30d6\u30eb\u3078\u306e\u30a2\u30af\u30bb\u30b9\u3092\u7701\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002. <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fb\u30b3\u30f3\u30c7\u30a3\u30b7\u30e7\u30f3\u30fb\u30d7\u30c3\u30b7\u30e5\u30c0\u30a6\u30f3\uff08ICP\uff09<\/strong> \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5185\u3067\u8ffd\u52a0\u306eWHERE\u6761\u4ef6\u3092\u4e8b\u524d\u306b\u691c\u8a3c\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u8fd4\u3055\u308c\u308b\u884c\u6570\u3068I\/O\u304c\u524a\u6e1b\u3055\u308c\u307e\u3059\u3002.<\/p>\n\n<p>\u306b\u3064\u3044\u3066 <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30de\u30fc\u30b8<\/strong> MariaDB \u3067\u306f\u3001\u8907\u6570\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\uff08\u5171\u901a\u90e8\u5206\uff0f\u548c\u96c6\u5408\uff09\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f OR \u8ff0\u8a9e\u3084\u8907\u6570\u306e\u9078\u629e\u6761\u4ef6\u304c\u3042\u308b\u5834\u5408\u306b\u5f79\u7acb\u3061\u307e\u3059\u304c\u3001\u9069\u5207\u306b\u9078\u629e\u3055\u308c\u305f\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3088\u308a\u3082\u51e6\u7406\u901f\u5ea6\u304c\u9045\u304f\u306a\u308b\u5834\u5408\u304c\u591a\u3044\u3067\u3059\u3002\u307e\u305f\u3001\u79c1\u306f\u4ee5\u4e0b\u306e\u70b9\u306b\u3064\u3044\u3066\u3082\u8a55\u4fa1\u3057\u3066\u3044\u307e\u3059\u3002 <strong>MRR<\/strong> \uff08\u30de\u30eb\u30c1\u30ec\u30f3\u30b8\u8aad\u307f\u53d6\u308a\uff09\u304a\u3088\u3073 <strong>BKA<\/strong> (Batched Key Access)\u3002MRR\u306f\u3001\u30e9\u30f3\u30c0\u30e0I\/O\u3092\u5e73\u6ed1\u5316\u3059\u308b\u305f\u3081\u306b\u8aad\u307f\u8fbc\u3080\u4e3b\u30ad\u30fc\u3092\u30bd\u30fc\u30c8\u3057\u307e\u3059\u3002\u4e00\u65b9\u3001BKA\u306f\u30b8\u30e7\u30a4\u30f3\u306e\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u675f\u306d\u308b\u3082\u306e\u3067\u3001\u7279\u306b\u975e\u30ab\u30d0\u30ec\u30c3\u30b8\u30b8\u30e7\u30a4\u30f3\u306b\u304a\u3044\u3066\u305d\u306e\u52b9\u679c\u3092\u767a\u63ee\u3057\u307e\u3059\u3002 \u5b9f\u969b\u306b\u306f\u3001optimizer_switch \u3092\u4f7f\u7528\u3057\u3066 BKA\/MRR \u3092\u30c6\u30b9\u30c8\u3057\u3001EXPLAIN ANALYZE \u3067 I\/O \u30d1\u30bf\u30fc\u30f3\u304c\u6e1b\u5c11\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002\u4e00\u65b9\u3001MariaDB \u304c <strong>\u30d6\u30ed\u30c3\u30af\u30cd\u30b9\u30c8\u30eb\u30fc\u30d7<\/strong> (BNL) \u306e\u5834\u5408\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u30b8\u30e7\u30a4\u30f3\u30d0\u30c3\u30d5\u30a1\uff08join_buffer_size\uff09\u3092\u5897\u3084\u3059\u304b\u3001\u3042\u308b\u3044\u306f\u5b9f\u969b\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u7d50\u5408\u3092\u53ef\u80fd\u306b\u3059\u308b\u30ea\u30e9\u30a4\u30c8\u3092\u884c\u3046\u65b9\u304c\u52b9\u679c\u7684\u3067\u3059\u3002.<\/p>\n\n<pre><code>-- \u4f8b\uff1a\u7d50\u5408\uff0b\u30d5\u30a3\u30eb\u30bf\uff0b\u4e26\u3079\u66ff\u3048\u7528\u306e\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\nCREATE INDEX ix_orders_cust_status_created\n  ON orders (customer_id, status, created_at);\n\n-- \u4e00\u822c\u7684\u306a\u30a2\u30af\u30bb\u30b9\u4f8b\nSELECT *\nFROM orders o\nJOIN customers c ON c.id = o.customer_id\nWHERE o.status = 'open' AND o.created_at &gt;= '2026-01-01'\nORDER BY o.created_at DESC\nLIMIT 50;\n<\/code><\/pre>\n\n<p>\u4e0a\u8a18\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306f\u6700\u3082\u9078\u629e\u6027\u306e\u9ad8\u3044\u9806\u5e8f\u3092\u9078\u629e\u3057\u3001\u30d5\u30a3\u30eb\u30bf\u3092\u65e9\u671f\u306b\u8a55\u4fa1\u3057\u3001\u591a\u304f\u306e\u5834\u5408\u3001\u8ffd\u52a0\u306e\u30d5\u30a1\u30a4\u30eb\u30bd\u30fc\u30c8\u3092\u5fc5\u8981\u3068\u305b\u305a\u306b\u30bd\u30fc\u30c8\u3092\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>ORDER BY\u3001GROUP BY\u3001\u30d5\u30a1\u30a4\u30eb\u30bd\u30fc\u30c8\u3001\u304a\u3088\u3073\u4e00\u6642\u30c6\u30fc\u30d6\u30eb<\/h2>\n\n<p>\u4e26\u3079\u66ff\u3048\u3084\u96c6\u8a08\u306b\u306f\u6642\u9593\u304c\u304b\u304b\u308a\u307e\u3059\u3002\u79c1\u304c\u78ba\u5b9f\u306b <strong>ORDER BY<\/strong> \u305d\u3057\u3066 <strong>GROUP BY<\/strong> \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u9806\u5e8f\u306b\u5f93\u3063\u3066\u5b9f\u884c\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u306f\u3001\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3068\u65b9\u5411\u304c\u5b8c\u5168\u306b\u4e00\u81f4\u3059\u308b\u5834\u5408\u306b\u6a5f\u80fd\u3057\u307e\u3059\u3002\u305d\u3046\u3067\u306a\u3044\u5834\u5408\u306f\u3001 <strong>\u30d5\u30a1\u30a4\u30eb\u30bd\u30fc\u30c8<\/strong> \u30bd\u30fc\u30c8\u30d0\u30c3\u30d5\u30a1\uff08sort_buffer_size\uff09\u304a\u3088\u3073\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u7d50\u679c\u30bb\u30c3\u30c8\u306b\u5e45\u306e\u5e83\u3044TEXT\/BLOB\u5217\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u5834\u5408\u3001MariaDB\u306e\u65b9\u304c\u9ad8\u901f\u306b\u51e6\u7406\u3055\u308c\u307e\u3059 <em>\u30aa\u30f3\u30c7\u30a3\u30b9\u30af<\/em> TEMP-Tables\uff08Aria\uff09\u306b\u3064\u3044\u3066\u3002\u5fc5\u8981\u306a\u5217\u306e\u307f\u3092\u9078\u629e\u3057\u305f\u308a\u3001\u5927\u304d\u306a\u30d5\u30a3\u30fc\u30eb\u30c9\u306f\u6700\u5f8c\u306b\u8aad\u307f\u8fbc\u3093\u3060\u308a\u3001\u9577\u3055\u304c\u5236\u9650\u3055\u308c\u305f\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u305f\u308a\u3059\u308b\u3053\u3068\u3067\u3001\u554f\u984c\u3092\u672a\u7136\u306b\u9632\u3044\u3067\u3044\u307e\u3059\u3002.<\/p>\n\n<p>\u96c6\u8a08\u3092\u884c\u3046\u969b\u306f\u3001\u53ef\u80fd\u306a\u9650\u308a\u3001, <strong>\u30eb\u30fc\u30ba\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fb\u30b9\u30ad\u30e3\u30f3<\/strong> \uff08\u4f8b\uff1a\u5148\u982d\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u90e8\u5206\u3067\u306e GROUP BY\uff09\u3092\u884c\u3044\u3001\u30b0\u30eb\u30fc\u30d7\u5316\u306b\u6cbf\u3063\u3066\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u9078\u629e\u3057\u307e\u3059\u3002\u4e2d\u9593\u7d50\u679c\u304c\u5927\u304d\u304f\u306a\u308b\u3068\u3001\u9069\u5207\u306a\u30ad\u30fc\u3092\u7528\u3044\u305f\u30de\u30c6\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u306e\u65b9\u304c\u3001\u5358\u4e00\u306e\u30e1\u30ac\u7d50\u5408\u3088\u308a\u3082\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306b\u512a\u308c\u3066\u3044\u307e\u3059\u3002 \u79c1\u306f\u5b9a\u671f\u7684\u306b\u30cf\u30f3\u30c9\u30e9\u306e\u30e1\u30c8\u30ea\u30af\u30b9\u3084 Created_tmp_* \u30ab\u30a6\u30f3\u30bf\u30fc\u3092\u6e2c\u5b9a\u3057\u3001\u30bd\u30fc\u30c8\u3084\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u306e\u30db\u30c3\u30c8\u30b9\u30dd\u30c3\u30c8\u3092\u7279\u5b9a\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<h2>\u30b5\u30d6\u30af\u30a8\u30ea\u3001\u30bb\u30df\u30b8\u30e7\u30a4\u30f3\u3001\u304a\u3088\u3073\u30de\u30c6\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3<\/h2>\n\n<p>\u591a\u304f\u306e\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u3001\u6e96\u5099\u6bb5\u968e\u3067\u52b9\u7387\u7684\u306b\u66f8\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002IN\/EXISTS\u69cb\u6587\u306f\u3001 <strong>\u30bb\u30df\u30b8\u30e7\u30a4\u30f3<\/strong> \u5b9f\u884c\u3057\u3001\u30de\u30c6\u30ea\u30a2\u30e9\u30a4\u30bc\u30fc\u30b7\u30e7\u30f3\u3084LooseScan\u3068\u3044\u3063\u305f\u6226\u7565\u3092\u7528\u3044\u307e\u3059\u3002\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u304c <strong>derived_merge<\/strong> \u5b9f\u884c\u3067\u304d\u305f\uff1a\u6d3e\u751f\u30c6\u30fc\u30d6\u30eb\uff08\u307e\u305f\u306fWITH-CTE\uff09\u304c\u5916\u5074\u306e\u5b9f\u884c\u8a08\u753b\u306b\u7d44\u307f\u8fbc\u307e\u308c\u308b\u3068\u3001\u305d\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u76f4\u63a5\u5229\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308b\u3002 \u305d\u308c\u304c\u3067\u304d\u306a\u3044\u5834\u5408\u3001\u30b5\u30d6\u30af\u30a8\u30ea\u306f\u4e00\u6642\u30c6\u30fc\u30d6\u30eb\u306b\u683c\u7d0d\u3055\u308c\u307e\u3059\u3002\u305d\u306e\u969b\u306f\u3001\u53ef\u80fd\u3067\u3042\u308c\u3070\uff08\u4f8b\u3048\u3070\u3001\u30ad\u30fc\u5217\u306b\u5bfe\u3057\u3066SELECT DISTINCT\/ORDER BY\u3092\u5b9f\u884c\u3059\u308b\u306a\u3069\u3057\u3066\uff09\u30ad\u30fc\u3092\u5272\u308a\u5f53\u3066\u3001\u7d50\u5408\u64cd\u4f5c\u304c\u300c\u884c\u65b9\u4e0d\u660e\u300d\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3057\u307e\u3059\u3002.<\/p>\n\n<pre><code>-- \u4f8b\uff1aIN\u306e\u4ee3\u308f\u308a\u306bEXISTS\u3092\u4f7f\u7528\u3057\u3001\u30de\u30fc\u30b8\u53ef\u80fd\u306a\u6d3e\u751f\u30c6\u30fc\u30d6\u30eb\nSELECT o.id\nFROM orders o\nWHERE EXISTS (\n  SELECT 1 FROM payments p\n  WHERE p.order_id = o.id AND p.state = 'captured'\n);\n\n-- \u660e\u78ba\u306a\u30ad\u30fc\u3092\u7528\u3044\u305f\u6d3e\u751f\u30c6\u30fc\u30d6\u30eb\nWITH paid_orders AS (\n  SELECT DISTINCT order_id\n  FROM payments\n  WHERE state = 'captured'\n)\nSELECT o.*\nFROM orders o\nJOIN paid_orders po ON po.order_id = o.id;\n<\/code><\/pre>\n\n<p>EXPLAIN FORMAT=JSON \u3092\u4f7f\u7528\u3057\u3066\u3001\u4ee5\u4e0b\u306e\u3053\u3068\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 <strong>\u5177\u73fe\u5316\u3055\u308c\u305f<\/strong> \u6216\u3044\u306f <strong>\u5f93\u5c5e\u30b5\u30d6\u30af\u30a8\u30ea<\/strong> \u9078\u51fa\u3055\u308c\u305f\u304b\u3069\u3046\u304b\u3001\u304a\u3088\u3073\u6761\u4ef6\uff08<strong>\u6761\u4ef6\u30d7\u30c3\u30b7\u30e5\u30c0\u30a6\u30f3<\/strong>) \u65e9\u3081\u306b\u624b\u3092\u6253\u3064\u3002.<\/p>\n\n<h2>\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30cb\u30f3\u30b0\u3068\u30d7\u30eb\u30fc\u30cb\u30f3\u30b0<\/h2>\n\n<p>\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u5206\u5272\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4ee3\u308f\u308a\u306b\u306f\u306a\u308a\u307e\u305b\u3093\u304c\u3001 <strong>1\u56de\u306e\u30a2\u30af\u30bb\u30b9\u3042\u305f\u308a\u306e\u30c7\u30fc\u30bf\u91cf<\/strong> \u5927\u5e45\u306b\u524a\u6e1b\u3059\u308b\u3002\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u306f\u3001\u8ff0\u8a9e\u304c <strong>\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u30ad\u30fc<\/strong> \u660e\u78ba\u306b\u4e00\u81f4\u3057\u3001\u95a2\u6570\u306b\u3088\u3063\u3066\u5224\u5225\u4e0d\u80fd\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u305f\u3081\u3067\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u5316\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306eWHERE\u53e5\u3067\u306fDATE(created_at)\u306e\u3088\u3046\u306a\u5f0f\u306f\u907f\u3051\u3001\u4ee3\u308f\u308a\u306b\u7bc4\u56f2\u306e\u5883\u754c\u5024\u3092\u4f7f\u7528\u3057\u3066\u3044\u307e\u3059\u3002EXPLAIN\u3092\u5b9f\u884c\u3059\u308b\u3068\u3001\u3069\u306e\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u304c\u8aad\u307f\u8fbc\u307e\u308c\u308b\u304b\u304c\u5206\u304b\u308a\u307e\u3059\u3002\u7bc4\u56f2\u304c\u5e83\u3044\u5834\u5408\u306f\u3001\u30d7\u30eb\u30fc\u30cb\u30f3\u30b0\u304c\u4e0d\u5341\u5206\u3067\u3042\u308b\u3053\u3068\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<p>\u5c0f\u3055\u306a\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u304c\u591a\u3059\u304e\u308b\u3068\u3001\u8a08\u753b\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u304c\u5897\u5927\u3057\u307e\u3059\u3002\u305d\u306e\u305f\u3081\u3001\u9069\u5207\u306a\u7c92\u5ea6\uff08\u4f8b\u3048\u3070\u3001\u6bce\u65e5\u3067\u306f\u306a\u304f\u6bce\u6708\u306a\u3069\uff09\u3092\u9078\u629e\u3057\u3001\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u3054\u3068\u306e\u7d71\u8a08\u60c5\u5831\u3092\u6700\u65b0\u306e\u72b6\u614b\u306b\u4fdd\u3061\uff08ANALYZE PARTITION\uff09\u3001\u91cd\u8981\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u5185\u306b\u30ed\u30fc\u30ab\u30eb\u306b\u5b58\u5728\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u3092\u78ba\u8a8d\u3057\u3066\u3044\u307e\u3059\u3002 \u79fb\u884c\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u306f\u3001\u30ec\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3084\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3078\u306e\u5f71\u97ff\u3082\u8003\u616e\u306b\u5165\u308c\u307e\u3059\u3002\u3053\u308c\u30892\u3064\u306f\u3001\u30d1\u30fc\u30c6\u30a3\u30b7\u30e7\u30f3\u5206\u5272\u3092\u3069\u306e\u7a0b\u5ea6\u7a4d\u6975\u7684\u306b\u884c\u3046\u304b\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u304b\u3089\u3067\u3059\u3002.<\/p>\n\n<h2>\u30b5\u30fc\u30b8\u30d3\u30ea\u30c6\u30a3\u3068\u30ea\u30e9\u30a4\u30c8\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n<p>\u6700\u3082\u30b7\u30f3\u30d7\u30eb\u306a\u624b\u6bb5\u306f\u4f9d\u7136\u3068\u3057\u3066 <strong>\u30b5\u30fc\u30b8\u30d3\u30ea\u30c6\u30a3<\/strong> \u2013 \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3067\u304d\u308b\u6761\u4ef6\u3002WHERE\u53e5\u3067\u306e\u5217\u306b\u5bfe\u3059\u308b\u95a2\u6570\u306e\u4f7f\u7528\u306f\u907f\u3051\u3001\u5217\u5074\u3067\u5b9a\u6570\u3092\u8fd4\u3057\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066OR\u6761\u4ef6\u3092 <strong>\u30e6\u30cb\u30aa\u30f3\u30fb\u30aa\u30fc\u30eb<\/strong>. \u5148\u982d\u306b\u30a2\u30f3\u30ab\u30fc\u306e\u306a\u3044LIKE\u691c\u7d22\uff08\u300c%foo\u300d\uff09\u306b\u306f\u3001BTREE\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u5f79\u306b\u7acb\u305f\u306a\u3044\u3002\u3053\u306e\u5834\u5408\u306f\u3001\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u691c\u7d22\u304b\u3001\u9069\u5207\u306a\u691c\u7d22\u30b5\u30fc\u30d3\u30b9\u3092\u5229\u7528\u3059\u308b\u3053\u3068\u3092\u691c\u8a0e\u3057\u3066\u3044\u308b\u3002\u8a08\u7b97\u306b\u306f <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u8a2d\u5b9a\u3055\u308c\u305f\u751f\u6210\u5217<\/strong>, \u3001\u3053\u308c\u306b\u3088\u308a\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5185\u306e\u30ed\u30b8\u30c3\u30af\u3092\u7279\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/p>\n\n<pre><code>-- \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u5217\u306b\u5bfe\u3059\u308b\u95a2\u6570\nWHERE DATE(created_at) = '2026-08-01'\n-- \u3088\u308a\u826f\u3044\u65b9\u6cd5\uff1a\u751f\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u304f\u7bc4\u56f2\u6307\u5b9a\nWHERE created_at &gt;= '2026-08-01' AND created_at &lt; &#039;2026-08-02&#039;\n\n-- \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1aOR\u53e5\u306b\u3088\u308a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u5229\u7528\u3067\u304d\u306a\u3044\nWHERE status = &#039;open&#039; OR customer_id = 42\n-- \u3088\u308a\u826f\u3044\u65b9\u6cd5\uff1aUNION ALL \u3092\u4f7f\u7528\u3057\u305f 2 \u3064\u306e\u691c\u7d22\u3068\u3001\u305d\u308c\u305e\u308c\u306b\u72ec\u81ea\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\n(SELECT ... WHERE status = &#039;open&#039;)\nUNION ALL\n(SELECT ... WHERE customer_id = 42&#039;);\n<\/code><\/pre>\n\n<p>\u8907\u5408\u6307\u6570\u306b\u3064\u3044\u3066\u306f\u3001\u79c1\u306f <strong>\u5de6\u5074\u63a5\u982d\u8f9e\u306e\u898f\u5247<\/strong> \u53b3\u5bc6\u306b\u9075\u5b88\u3057\u3001\u5217\u3092\u9078\u629e\u6027\u306e\u9806\u3001\u304a\u3088\u3073\u5f8c\u3067\u5fc5\u8981\u3068\u306a\u308b\u30bd\u30fc\u30c8\u9806\u306b\u4e26\u3079\u66ff\u3048\u307e\u3059\u3002\u964d\u9806\u306e ORDER BY \u304c\u5fc5\u8981\u306b\u306a\u308b\u5834\u5408\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30ec\u30a4\u30a2\u30a6\u30c8\u306b\u305d\u306e\u70b9\u3092\u53cd\u6620\u3055\u305b\u307e\u3059\u3002\u305d\u3046\u3059\u308b\u3053\u3068\u3067\u3001\u30d5\u30a1\u30a4\u30eb\u30bd\u30fc\u30c8\u3092\u56de\u907f\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n<h2>\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u30b9\u30a4\u30c3\u30c1\u3068\u30b3\u30b9\u30c8\u306e\u5fae\u8abf\u6574<\/h2>\n\n<p>\u30af\u30a8\u30ea\u3092\u5b9f\u884c\u3059\u308b\u524d\u306b\u3001\u6b21\u306e\u70b9\u3092\u78ba\u8a8d\u3057\u307e\u3059\u3002 <strong>optimizer_switch<\/strong> \u304a\u3088\u3073\u30d0\u30c3\u30d5\u30a1\u3002\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u6a5f\u80fd\u3068\u3057\u3066 <em>mrr<\/em>, <em>batched_key_access<\/em>, <em>index_merge<\/em>, <em>\u30bb\u30df\u30b8\u30e7\u30a4\u30f3<\/em>, <em>derived_merge<\/em> \u6216\u3044\u306f <em>\u6d3e\u751f\u578b\u306b\u5bfe\u3059\u308b\u6761\u4ef6\u30d7\u30c3\u30b7\u30e5\u30c0\u30a6\u30f3<\/em> \u306f\u30bb\u30c3\u30b7\u30e7\u30f3\u3054\u3068\u306b\u8abf\u6574\u53ef\u80fd\u3067\u3059\u3002\u79c1\u306f\u30c6\u30b9\u30c8\u30bb\u30c3\u30b7\u30e7\u30f3\u3054\u3068\u306b\u5019\u88dc\u3092\u610f\u56f3\u7684\u306b\u6709\u52b9\u5316\u3057\u3001EXPLAIN ANALYZE \u3067\u6e2c\u5b9a\u3092\u884c\u3044\u3001\u52b9\u679c\u304c\u5f97\u3089\u308c\u306a\u3044\u5834\u5408\u306f\u5143\u306b\u623b\u3057\u307e\u3059\u3002\u7d50\u5408\u30d1\u30b9\u306f\u3001\u5341\u5206\u306a <strong>\u7d50\u5408\u30d0\u30c3\u30d5\u30a1\u30b5\u30a4\u30ba<\/strong>; \u3055\u307e\u3056\u307e\u306a\u7a2e\u985e\u306e <strong>\u30bd\u30fc\u30c8\u30fb\u30d0\u30c3\u30d5\u30a1\u30fb\u30b5\u30a4\u30ba<\/strong>. \u540c\u6642\u306b\u3001\u4e26\u884c\u51e6\u7406\u306b\u3088\u308b\u8ca0\u8377\u304c\u304b\u304b\u3063\u305f\u969b\u306b\u30b5\u30fc\u30d0\u30fc\u304c\u30b9\u30ef\u30c3\u30d7\u72b6\u614b\u306b\u9665\u3089\u306a\u3044\u3088\u3046\u3001\u4e26\u884c\u51e6\u7406\u6570\u306b\u5bfe\u3059\u308b\u30d0\u30c3\u30d5\u30a1\u306e\u72b6\u6cc1\u3092\u5e38\u306b\u76e3\u8996\u3057\u3066\u3044\u307e\u3059\u3002.<\/p>\n\n<p>\u30b3\u30b9\u30c8\u9762\u3067\u306f\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3001\u524d\u8ff0\u306e <strong>optimizer_costs<\/strong> \u30de\u30a4\u30af\u30ed\u79d2\u5358\u4f4d\u3067\u3002\u79c1\u306e\u6307\u91dd\u306f\u3001\u6e2c\u5b9a\u30dd\u30a4\u30f3\u30c8\u3092\u8a18\u9332\u3057\u305f\u3001\u5c0f\u3055\u304f\u3066\u5143\u306b\u623b\u305b\u308b\u30b9\u30c6\u30c3\u30d7\u3092\u8e0f\u3080\u3053\u3068\u3067\u3059\u3002\u79c1\u306f <strong>LAST_QUERY_COST<\/strong> \u59a5\u5f53\u6027\u30c1\u30a7\u30c3\u30af\u3092\u884c\u3046\u305f\u3081\u3001\u307e\u305f\u3001\u8a08\u753b\u306f\u5177\u4f53\u7684\u306a\u30ea\u30c6\u30e9\u30eb\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3059\u308b\u53ef\u80fd\u6027\u304c\u3042\u308b\u305f\u3081\u3001\u73fe\u5b9f\u7684\u306a\u30d1\u30e9\u30e1\u30fc\u30bf\u5024\u3092\u7528\u3044\u3066\u6e2c\u5b9a\u3092\u7e70\u308a\u8fd4\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u8a08\u753b\u306e\u5b89\u5b9a\u6027\u3001\u56de\u5e30\u5206\u6790\u3001\u30c1\u30fc\u30e0\u306e\u30ef\u30fc\u30af\u30d5\u30ed\u30fc<\/h2>\n\n<p>\u512a\u308c\u305f\u8a08\u753b\u3067\u3042\u3063\u3066\u3082\u3001\u30c7\u30fc\u30bf\u306e\u5897\u52a0\u3084\u30d0\u30fc\u30b8\u30e7\u30f3\u306e\u5909\u66f4\u306b\u3088\u3063\u3066 <strong>\u50be\u304f<\/strong>. \u305d\u306e\u305f\u3081\u3001\u30af\u30a8\u30ea\u30cf\u30c3\u30b7\u30e5\u3001EXPLAIN-JSON\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30c8\u30ec\u30fc\u30b9\u306e\u629c\u7c8b\u3001EXPLAIN ANALYZE\u306e\u5b9f\u884c\u6642\u9593\u3068\u3044\u3063\u305f\u5b9f\u884c\u8a08\u753b\u306b\u95a2\u3059\u308b\u60c5\u5831\u3092\u78ba\u5b9f\u306b\u8a18\u9332\u3057\u3066\u3044\u307e\u3059\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5909\u66f4\u3084\u30ea\u30e9\u30a4\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u5909\u66f4\u524d\u5f8c\u306e\u8a3c\u62e0\u3092\u6dfb\u4ed8\u3057\u305f\u30d7\u30eb\u30ea\u30af\u30a8\u30b9\u30c8\u3068\u3057\u3066\u63d0\u51fa\u3057\u3066\u3044\u307e\u3059\u3002 CI\/CD\u74b0\u5883\u3067\u306f\u3001\u4ee3\u8868\u7684\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u7528\u3044\u3066\u3001\u91cd\u8981\u306a\u30af\u30a8\u30ea\u3092\u81ea\u52d5\u7684\u306b\u691c\u8a3c\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001 <strong>\u56de\u5e30\u8a08\u753b<\/strong> \u65e9\u671d\u306b\u3002.<\/p>\n\n<p>\u5384\u4ecb\u306a\u30b1\u30fc\u30b9\u306b\u306f\u3001\u79c1\u306f <strong>\u30d2\u30f3\u30c8<\/strong> \uff08FORCE INDEX\u3001STRAIGHT_JOIN\u3001\u30af\u30a8\u30ea\u3054\u3068\u306eoptimizer_switch\uff09\u306f\u6700\u5f8c\u306e\u624b\u6bb5\u3068\u3057\u3066\u7528\u610f\u3055\u308c\u3066\u3044\u307e\u3059\u304c\u3001\u4f7f\u7528\u306f\u63a7\u3048\u3081\u306b\u3057\u3001\u6709\u52b9\u671f\u9650\u3092\u8a2d\u3051\u3066\u304f\u3060\u3055\u3044\u3002\u3080\u3057\u308d\u3001\u539f\u56e0\uff08\u7d71\u8a08\u60c5\u5831\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u30af\u30a8\u30ea\u306e\u8a18\u8ff0\uff09\u305d\u306e\u3082\u306e\u3092\u6539\u5584\u3059\u308b\u65b9\u304c\u671b\u307e\u3057\u3044\u3067\u3059\u3002 \u30c1\u30fc\u30e0\u5185\u3067\u306f\u3001Sargability\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u8a2d\u8a08\u3001\u6e2c\u5b9a\u306e\u5fb9\u5e95\u306b\u95a2\u3059\u308b\u7c21\u6f54\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u3051\u308b\u3053\u3068\u3067\u3001\u65b0\u6a5f\u80fd\u306e\u5c0e\u5165\u306b\u3088\u3063\u3066\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u4e0a\u306e\u554f\u984c\u304c\u898b\u904e\u3054\u3055\u308c\u308b\u3053\u3068\u3092\u9632\u3050\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/p>\n\n\n<figure class=\"wp-block-image size-full is-resized\">\n  <img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/webhosting.de\/wp-content\/uploads\/2026\/08\/mariadb-query-optimizer-7832.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u6982\u8981\uff1a\u8a08\u753b\u304b\u3089\u6210\u679c\u3078<\/h2>\n\n<p>\u8ab0\u304c\u5229\u7528\u3067\u304d\u308b\u304b <strong>\u30d7\u30e9\u30f3<\/strong> \u7406\u89e3\u3059\u308b\u3053\u3068\u304c\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5de6\u53f3\u3057\u307e\u3059\u3002\u300cParsing\u300d\u300cPreparing\u300d\u300cOptimizing\u300d\u300cExecuting\u300d\u306e\u5404\u30d5\u30a7\u30fc\u30ba\u3092\u5206\u6790\u3059\u308b\u3053\u3068\u3067\u3001\u3069\u3053\u3067\u6642\u9593\u304c\u6d6a\u8cbb\u3055\u308c\u3066\u3044\u308b\u304b\u304c\u660e\u3089\u304b\u306b\u306a\u308a\u307e\u3059\u3002\u30d0\u30fc\u30b8\u30e7\u30f311.0\u4ee5\u964d\u3067\u5c0e\u5165\u3055\u308c\u305f\u6642\u9593\u30d9\u30fc\u30b9\u306e\u30b3\u30b9\u30c8\u30e2\u30c7\u30eb\u3001\u9069\u5207\u306b\u7ba1\u7406\u3055\u308c\u305f\u7d71\u8a08\u60c5\u5831\u3001\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u306b\u3088\u308a\u3001\u898b\u7a4d\u3082\u308a\u306e\u4fe1\u983c\u6027\u304c\u9ad8\u307e\u308a\u307e\u3059\u3002 EXPLAIN\u3001EXPLAIN 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