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<strong>\u76ee\u6a19<\/strong> \u3068\u5b9f\u969b\u306e\u5024\u3092\u6e2c\u5b9a\u3059\u308b\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6700\u5927\u306e\u4fa1\u5024\u3092\u767a\u63ee\u3059\u308b\u5834\u6240\u3067\u3042\u308b\u305f\u3081\u3001\u79c1\u306f\u8aad\u307f\u8fbc\u307f\u306e\u591a\u3044\u30af\u30a8\u30ea\u3092\u512a\u5148\u3057\u3066\u3044\u308b\u3002 <strong>\u52b9\u679c<\/strong>. .\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u305f\u3073\u306b\u633f\u5165\u3084\u66f4\u65b0\u306e\u30b9\u30d4\u30fc\u30c9\u304c\u843d\u3061\u308b\u306e\u3067\u3001\u66f8\u304d\u8fbc\u307f\u96c6\u4e2d\u578b\u306e\u30c6\u30fc\u30d6\u30eb\u306f\u614e\u91cd\u306b\u6271\u3046\u3002\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3088\u308a\u3082\u5c0f\u3055\u306a\u30c6\u30fc\u30d6\u30eb\u3092\u30b9\u30ad\u30e3\u30f3\u3059\u308b\u65b9\u304c\u901f\u3044\u306e\u3067\u3001\u5c0f\u3055\u306a\u30c6\u30fc\u30d6\u30eb\u306f\u5909\u66f4\u3057\u306a\u3044\u3053\u3068\u304c\u591a\u3044\u3002 <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/strong>. .\u305d\u3057\u3066\u3001\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\u3092\u6301\u7d9a\u7684\u306b\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306b\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u3092\u7d44\u307f\u5408\u308f\u305b\u3066\u3044\u308b\u3002 <strong>\u4e0b\u3052\u308b<\/strong>.<\/p>\n<ul>\n  <li><strong>\u8aad\u66f8\u91cf<\/strong> \u512a\u5148\u9806\u4f4dWHERE, JOIN, ORDER BY \u512a\u5148\u9806\u4f4d<\/li>\n  <li><strong>\u9078\u629e\u6027<\/strong> \u30c1\u30a7\u30c3\u30af\uff1a\u91cd\u8907\u3059\u308b\u5024\u306f\u307b\u3068\u3093\u3069\u306a\u3044\u3002<\/li>\n  <li><strong>\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/strong> \u30ce\u30fc\u30c8\u7b46\u8a18\u304c\u9045\u304f\u306a\u308b<\/li>\n  <li><strong>wp_postmeta<\/strong> \u3067\u3001wp_options \u3092\u7279\u5225\u306b\u6271\u3046\u3002<\/li>\n  <li><strong>\u8aac\u660e\u3059\u308b<\/strong> \u5f53\u3066\u305a\u3063\u307d\u3046\u3067\u306f\u306a\u304f\u3001\u4f7f\u3063\u3066\u6e2c\u308b<\/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\/01\/wordpress-datenbank-indexe-9381.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>MySQL\u3068WordPress\u306b\u304a\u3051\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4ed5\u7d44\u307f<\/h2>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f <strong>\u76ee\u6b21<\/strong>\u5404\u884c\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u4ee3\u308f\u308a\u306b\u3001MySQL\u306f\u9069\u5207\u306a\u7bc4\u56f2\u306b\u76f4\u63a5\u30b8\u30e3\u30f3\u30d7\u3059\u308b\u3002B-tree\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u30bd\u30fc\u30c8\u3001\u7bc4\u56f2\u30d5\u30a3\u30eb\u30bf\u3001JOIN\u3092\u975e\u5e38\u306b\u7c21\u5358\u306b\u884c\u3046\u3053\u3068\u304c\u3067\u304d\u308b\u305f\u3081\u3001WordPress\u306e\u307b\u3068\u3093\u3069\u306e\u30b1\u30fc\u30b9\u3092\u30ab\u30d0\u30fc\u3057\u307e\u3059\u3002 <strong>\u826f\u3044<\/strong> \u3092\u30b5\u30dd\u30fc\u30c8\u3057\u3066\u3044\u307e\u3059\u3002\u30cf\u30c3\u30b7\u30e5\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u6b63\u78ba\u306a\u6bd4\u8f03\u3092\u9ad8\u901f\u5316\u3059\u308b\u304c\u3001\u691c\u7d22\u3067\u3088\u304f\u76ee\u306b\u3059\u308b\u7bc4\u56f2\u3084LIKE\u30af\u30a8\u30ea\u306b\u306f\u9069\u3057\u3066\u3044\u306a\u3044\u3002\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u5358\u8a9e\u3092\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3057\u3001post_content\u306e\u3088\u3046\u306a\u9577\u3044\u30c6\u30ad\u30b9\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22\u3092\u5927\u5e45\u306b\u30b9\u30d4\u30fc\u30c9\u30a2\u30c3\u30d7\u3057\u307e\u3059\u3002\u610f\u5473\u306e\u3042\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u306a\u3051\u308c\u3070\u3001\u8907\u96d1\u306a\u30af\u30a8\u30ea\u306f\u3059\u3079\u3066\u30d5\u30eb\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u3067\u7d42\u308f\u3063\u3066\u3057\u307e\u3046\u3002 <strong>\u5f85\u3061\u6642\u9593<\/strong>.<\/p>\n\n<h2>WordPress\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u672c\u5f53\u306b\u5f79\u7acb\u3064\u3068\u304d<\/h2>\n<p>\u79c1\u306f\u3001\u30af\u30a8\u30ea\u304c\u9078\u629e\u7684\u306b\u5b9a\u671f\u7684\u306b\u5b9f\u884c\u3055\u308c\u308b\u3088\u3046\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8a2d\u5b9a\u3057\u3066\u3044\u308b\u3002 <strong>ID<\/strong>, E\u30e1\u30fc\u30eb\u3001\u30b9\u30e9\u30c3\u30b0\u3001post_date\u3002wp_posts\u3067\u306f\u3001post_author\u3001post_date\u3001post_status\u306b\u5bfe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u52b9\u679c\u7684\u3067\u3059\u3002\u3053\u308c\u3089\u306e\u30ab\u30e9\u30e0\u306fWHERE\u3084ORDER BY\u306b\u3088\u304f\u767b\u5834\u3059\u308b\u304b\u3089\u3067\u3059\u3002wp_postmeta\u3067\u306f\u3001meta_key\u3068\u30aa\u30d7\u30b7\u30e7\u30f3\u3067(meta_key, meta_value)\u306b\u5bfe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3001\u30c6\u30fc\u30de\u3084\u30d7\u30e9\u30b0\u30a4\u30f3\u304c\u591a\u304f\u306e\u30ab\u30b9\u30bf\u30e0\u30d5\u30a3\u30fc\u30eb\u30c9\u3092\u30af\u30a8\u30ea\u3059\u308b\u5834\u5408\u306b\u5927\u304d\u306a\u30b8\u30e3\u30f3\u30d7\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002wp_posts\u3068wp_postmeta\u9593\u306eJOIN\u306f\u3001\u4e21\u65b9\u306e\u30da\u30fc\u30b8\u304c\u4e00\u81f4\u3059\u308b\u30ad\u30fc\u3092\u6301\u3064\u3068\u3059\u3050\u306b\u9855\u8457\u306a\u6069\u6075\u3092\u53d7\u3051\u308b\u3002\u307e\u305f\u3001\u5927\u304d\u306a\u30c6\u30fc\u30d6\u30eb\u3001\u30ec\u30dd\u30fc\u30c8\u3001\u30a2\u30fc\u30ab\u30a4\u30d6\u3001\u30ab\u30c6\u30b4\u30ea\u30da\u30fc\u30b8\u3067\u306f\u3001\u30af\u30a8\u30ea\u304c\u6570\u767e\u4e07\u884c\u306b\u6e21\u3063\u3066\u3067\u306f\u306a\u304f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304b\u3089\u8aad\u307f\u8fbc\u307e\u308c\u308b\u5834\u5408\u306b\u6069\u6075\u3092\u53d7\u3051\u308b\u3002 <strong>\u30de\u30b9\u30c8<\/strong>.<\/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\/01\/wordpress_datenbank_meeting_9284.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u307b\u3068\u3093\u3069\u5f79\u306b\u7acb\u305f\u305a\u3001\u5bb3\u306b\u3055\u3048\u306a\u308b\u5834\u5408<\/h2>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30921\u3064\u8ffd\u52a0\u3059\u308b\u3054\u3068\u306b <strong>\u30e1\u30e2\u30ea<\/strong> \u3068\u306a\u308a\u3001MySQL 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<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%82%a4%e3%83%b3%e3%83%87%e3%83%83%e3%82%af%e3%82%b9%e3%81%ae%e6%90%8d%e5%ae%b3%e5%88%a9%e7%94%a8mysql%e3%81%ae%e8%90%bd%e3%81%a8%e3%81%97\/\">MySQL\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30c8\u30e9\u30c3\u30d7<\/a> \u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u3002 <strong>\u4f7f\u7528<\/strong>.<\/p>\n\n<h2>\u5b9f\u8df5\uff1a\u6e2c\u5b9a\u304b\u3089\u5909\u9769\u3078<\/h2>\n<p>\u79c1\u306f\u6e2c\u5b9a\u304b\u3089\u59cb\u3081\u308b\u3002 <strong>\u76f4\u611f<\/strong>WordPress\u30d0\u30c3\u30af\u30a8\u30f3\u30c9\u306e\u30af\u30a8\u30ea\u30e2\u30cb\u30bf\u306f\u3001\u9045\u3044\u30af\u30a8\u30ea\u3001\u30d1\u30e9\u30e1\u30fc\u30bf\u3001\u547c\u3073\u51fa\u3057\u5143\u3092\u8868\u793a\u3057\u3066\u304f\u308c\u308b\u3002EXPLAIN\u306f\u3001MySQL\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u3063\u3066\u3044\u308b\u306e\u304b\u3001ALL\u3067\u30c6\u30fc\u30d6\u30eb\u5168\u4f53\u3092\u30b9\u30ad\u30e3\u30f3\u3057\u3066\u3044\u308b\u306e\u304b\u3092\u6559\u3048\u3066\u304f\u308c\u308b\u3002\u3053\u306e\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u3001WHERE\u3001JOIN\u3001ORDER BY\u306e\u30ab\u30e9\u30e0\u5c02\u7528\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u5404\u5909\u66f4\u306e\u5f8c\u3001\u518d\u5ea6\u6e2c\u5b9a\u3057\u3001\u5909\u66f4\u5c65\u6b74\u3092\u8a18\u9332\u3059\u308b\u3053\u3068\u3067\u3001\u60aa\u5f71\u97ff\u3092\u7d20\u65e9\u304f\u53d6\u308a\u9664\u304f\u3053\u3068\u304c\u3067\u304d\u308b\u3002\u5f85\u3061\u6642\u9593\u304c\u4e3b\u306b\u30af\u30a8\u30ea\u8a2d\u8a08\u306b\u8d77\u56e0\u3059\u308b\u5834\u5408\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u8a2d\u5b9a\u3057\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%81%aa%e3%81%9c%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%81%ae%e3%83%ac%e3%82%a4%e3%83%86%e3%83%b3%e3%82%b7%e3%83%bc%e3%81%8c%e9%ab%98%e3%81%84%e3%81%ae%e3%81%af%e3%83%9b%e3%82%b9\/\">\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u306e\u4ee3\u308f\u308a\u306b\u30af\u30a8\u30ea\u30fc\u30c7\u30b6\u30a4\u30f3<\/a>, \u306a\u305c\u306a\u3089\u3001\u3088\u308a\u5f37\u529b\u306a\u30b5\u30fc\u30d0\u30fc\u306f\u96a0\u3059\u3060\u3051\u3060\u304b\u3089\u3060\u3002 <strong>\u539f\u56e0<\/strong>.<\/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\/01\/wordpress-datenbank-indizes-vergleich-8271.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>WordPress\u30c6\u30fc\u30d6\u30eb\u306e\u30bf\u30fc\u30b2\u30c3\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210\uff1a\u6982\u8981\u3068\u4f8b<\/h2>\n<p>wp_posts\u3067\u306f\u3001\u30a2\u30fc\u30ab\u30a4\u30d6\u3001\u8457\u8005\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u95a2\u3059\u308b\u30af\u30a8\u30ea\u3092 <strong>\u6295\u7a3f\u65e5<\/strong>, post_author\u3001post_status\u3001\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u3053\u308c\u3089\u306e\u7d44\u307f\u5408\u308f\u305b\u3002wp_postmeta\u3067\u306f\u3001\u30ad\u30fc\u3068\u5024\u306e\u3069\u3061\u3089\u3092\u983b\u7e41\u306b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3059\u308b\u304b\u306b\u3088\u3063\u3066\u3001meta_key\u3068\u5fc5\u8981\u306b\u5fdc\u3058\u3066(post_id, meta_key)\u307e\u305f\u306f(meta_key, meta_value)\u3092\u8a2d\u5b9a\u3059\u308b\u3002wp_comments\u3067\u306f\u3001comment_post_ID\u306b\u5bfe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3001\u6295\u7a3f\u3054\u3068\u306e\u30b3\u30e1\u30f3\u30c8\u4e00\u89a7\u3092\u9ad8\u901f\u5316\u3059\u308b\u305f\u3081\u306b\u6a5f\u80fd\u3059\u308b\u3002wp_users\u3067\u306f\u3001user_email\u3068user_login\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3001\u30ed\u30b0\u30a4\u30f3\u3084\u7ba1\u7406\u8005\u691c\u7d22\u306e\u305f\u3081\u306e\u8fc5\u901f\u306a\u30a2\u30af\u30bb\u30b9\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u30bf\u30af\u30bd\u30ce\u30df\u30fc\u30fb\u30c6\u30fc\u30d6\u30eb\u3067\u306f\u3001\u30ab\u30c6\u30b4\u30ea\u30fc\u3001\u30bf\u30b0\u3001\u5546\u54c1\u5c5e\u6027\u306b\u5bfe\u3059\u308b\u30af\u30a8\u30ea\u304c\u53ef\u80fd\u306a\u9650\u308a\u9ad8\u901f\u306b\u306a\u308b\u3088\u3046\u306b\u3001JOIN\u30d1\u30b9\u306b\u6ce8\u610f\u3092\u6255\u3063\u3066\u3044\u308b\u3002 <strong>\u76f4\u306b<\/strong> \u4ed5\u4e8b\u3060\u3002<\/p>\n<table>\n  <thead>\n    <tr>\n      <th>WP\u30c6\u30fc\u30d6\u30eb\/\u30d5\u30a3\u30fc\u30eb\u30c9<\/th>\n      <th>\u4ee3\u8868\u7684\u306a\u30d5\u30a3\u30eb\u30bf\u30fc<\/th>\n      <th>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u63a8\u85a6<\/th>\n      <th>\u30d9\u30cd\u30d5\u30a3\u30c3\u30c8<\/th>\n      <th>\u30ea\u30b9\u30af<\/th>\n    <\/tr>\n  <\/thead>\n  <tbody>\n    <tr>\n      <td>wp_posts (post_date, post_status)<\/td>\n      <td>\u30a2\u30fc\u30ab\u30a4\u30d6\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u30ea\u30b9\u30c8<\/td>\n      <td>INDEX(post_status, post_date)<\/td>\n      <td>\u8fc5\u901f\u306a\u30bd\u30fc\u30c8\u3068\u7bc4\u56f2<\/td>\n      <td>\u3088\u308a\u591a\u304f\u306e\u30e9\u30a4\u30c6\u30a3\u30f3\u30b0\u30fb\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9<\/td>\n    <\/tr>\n    <tr>\n      <td>wp_posts (post_author)<\/td>\n      <td>\u8457\u8005\u30da\u30fc\u30b8<\/td>\n      <td>INDEX(\u6295\u7a3f\u8457\u8005)<\/td>\n      <td>\u9ad8\u901f\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/td>\n      <td>\u5c0f\u898f\u6a21\u30b5\u30a4\u30c8\u3067\u306f\u4f4e\u53ce\u76ca<\/td>\n    <\/tr>\n    <tr>\n      <td>wp_postmeta (meta_key, meta_value)<\/td>\n      <td>\u30ab\u30b9\u30bf\u30e0\u30d5\u30a3\u30fc\u30eb\u30c9<\/td>\n      <td>\u5fc5\u8981\u306b\u5fdc\u3058\u3066INDEX(meta_key) (meta_key, meta_value)<\/td>\n      <td>\u5927\u5e45\u306a\u52a0\u901f<\/td>\n      <td>\u3088\u308a\u5927\u304d\u306a\u30b9\u30c8\u30ec\u30fc\u30b8\u8981\u4ef6<\/td>\n    <\/tr>\n    <tr>\n      <td>wp_comments (comment_post_ID)<\/td>\n      <td>\u6295\u7a3f\u3054\u3068\u306e\u30b3\u30e1\u30f3\u30c8<\/td>\n      <td>INDEX(\u30b3\u30e1\u30f3\u30c8\u6295\u7a3fID)<\/td>\n      <td>\u30af\u30a4\u30c3\u30af\u30a2\u30ed\u30b1\u30fc\u30b7\u30e7\u30f3<\/td>\n      <td>\u9ad8\u3044\u66f4\u65b0\u30b3\u30b9\u30c8<\/td>\n    <\/tr>\n    <tr>\n      <td>wp_users (user_email, user_login)<\/td>\n      <td>\u30ed\u30b0\u30a4\u30f3\u3001\u7ba1\u7406\u8005\u691c\u7d22<\/td>\n      <td>UNIQUE(user_email)\u3001INDEX(user_login)<\/td>\n      <td>\u5b8c\u5168\u4e00\u81f4<\/td>\n      <td>\u30d0\u30eb\u30af\u8f38\u5165\u306b\u304b\u304b\u308b\u8cbb\u7528<\/td>\n    <\/tr>\n  <\/tbody>\n<\/table>\n<p>\u9577\u3044\u6587\u5b57\u5217\u306b\u306f\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3082\u4f7f\u3046\u3002 <strong>\u30e1\u30bf\u30ad\u30fc<\/strong>(20)\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u5fc5\u8981\u306a\u5bb9\u91cf\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u30d5\u30c3\u30c8\u30d7\u30ea\u30f3\u30c8\u3092\u5236\u9650\u3057\u3066\u3044\u308b\u3002\u79c1\u306f\u3001\u30af\u30a8\u30ea\u5185\u306e\u30d5\u30a3\u30eb\u30bf\u30b7\u30fc\u30b1\u30f3\u30b9\u306b\u5f93\u3063\u3066\u3001\u5de6\u5074\u306e\u63a5\u982d\u8f9e\u304c\u4f7f\u7528\u3055\u308c\u308b\u3088\u3046\u306b\u30de\u30eb\u30c1\u30ab\u30e9\u30e0\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6574\u5217\u3055\u305b\u308b\u3002\u4e2d\u5bb9\u91cf\u306e\u30c6\u30ad\u30b9\u30c8\u691c\u7d22\u3067\u306f\u3001post_content\u306b\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30ec\u30b9\u30dd\u30f3\u30b9\u30bf\u30a4\u30e0\u304c\u5927\u5e45\u306b\u77ed\u7e2e\u3055\u308c\u308b\u3002\u5148\u982d\u306e\u30d7\u30ec\u30fc\u30b9\u30db\u30eb\u30c0\u30fc\uff08c\uff09\u304c\u3042\u308bLIKE\u691c\u7d22\u3067\u306f\u3001\u53e4\u5178\u7684\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u306f\u5bfe\u5fdc\u3067\u304d\u306a\u3044\u306e\u3067\u3001\u3053\u306e\u3042\u305f\u308a\u3067\u8a08\u753b\u3092\u7acb\u3066\u308b\u3002\u305d\u3057\u3066\u3001\u30c6\u30fc\u30d6\u30eb\u3092\u5909\u66f4\u3059\u308b\u524d\u306b\u3001\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u3092\u30d0\u30c3\u30af\u30a2\u30c3\u30d7\u3057\u3001\u5909\u66f4\u3092 <strong>\u30b9\u30c6\u30fc\u30b8\u30f3\u30b0<\/strong>-\u74b0\u5883\u3002.<\/p>\n\n<h2>\u6e2c\u5b9a\u3068\u5236\u5fa1\uff1aEXPLAIN\u3001SHOW INDEX\u3001\u30ed\u30b0<\/h2>\n<p>EXPLAIN\u3092\u4f7f\u3048\u3070\u3001\u30af\u30a8\u30ea\u304c\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u304c\u4e00\u76ee\u77ad\u7136\u3067\u3059\u3002 <strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9<\/strong> type=ref\u307e\u305f\u306frange\u304c\u826f\u304f\u3001ALL\u306f\u30c6\u30fc\u30d6\u30eb\u30b9\u30ad\u30e3\u30f3\u3092\u6307\u3059\u3002SHOW INDEX FROM\u30c6\u30fc\u30d6\u30eb\u306f\u3001\u65e2\u5b58\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3001\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3001\u91cd\u8907\u3092\u660e\u3089\u304b\u306b\u3057\u307e\u3059\u3002my.cnf\u306bslow_query_log\u3092\u7a4d\u6975\u7684\u306b\u66f8\u304d\u3001\u5b9f\u884c\u6642\u9593\u306e\u9577\u3044\u30af\u30a8\u30ea\u3092\u53ce\u96c6\u3057\u3001\u7279\u5225\u306b\u51e6\u7406\u3059\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u5909\u66f4\u5f8c\u306f\u3001OPTIMIZE TABLE\u3092\u4f7f\u3063\u3066\u7d71\u8a08\u3068\u30d5\u30e9\u30b0\u30e1\u30f3\u30c6\u30fc\u30b7\u30e7\u30f3\u3092\u66f4\u65b0\u3057\u307e\u3059\u3002\u305d\u3057\u3066\u3001\u5909\u66f4\u5185\u5bb9\u3092\u30b3\u30e1\u30f3\u30c8\u3068\u65e5\u4ed8\u3067\u76f4\u63a5 <strong>SQL<\/strong>-\u30b9\u30af\u30ea\u30d7\u30c8\u3092\u4f7f\u3048\u3070\u3001\u5f8c\u3067\u518d\u73fe\u3067\u304d\u308b\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\/01\/wordpress_datenbank_indizes_4872.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>WooCommerce\u3001wp_postmeta\u3068\u5168\u6587\uff1a\u5b9f\u8df5\u7684\u306a\u6700\u9069\u5316<\/h2>\n<p>\u591a\u304f\u306e\u5546\u54c1\u3092\u6271\u3046\u5e97\u306f\u3001\u591a\u304f\u306e\u60a9\u307f\u3092\u62b1\u3048\u3066\u3044\u308b\u3002 <strong>\u30b8\u30e7\u30a4\u30f3\u30ba<\/strong> \u30d7\u30ed\u30d1\u30c6\u30a3\u3068\u30d5\u30a3\u30eb\u30bf\u30fc\u306fwp_postmeta\u306b\u914d\u7f6e\u3055\u308c\u3066\u3044\u308b\u304b\u3089\u3067\u3059\u3002(post_id\u3001meta_key)\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u5546\u54c1\u30da\u30fc\u30b8\u3001\u30d5\u30a3\u30eb\u30bf\u30fc\u3001API\u30b3\u30fc\u30eb\u3092\u5927\u5e45\u306b\u9ad8\u901f\u5316\u3057\u307e\u3059\u3002\u30ab\u30c6\u30b4\u30ea\u30fc\u30da\u30fc\u30b8\u3067\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u7d44\u307f\u5408\u308f\u305b\u304c\u91cd\u8981\u3067\u3001\u7e70\u308a\u8fd4\u3057\u8868\u793a\u3055\u308c\u308b\u30ea\u30b9\u30c8\u304c\u5e38\u306b\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u306b\u8ca0\u62c5\u3092\u304b\u3051\u306a\u3044\u3088\u3046\u306b\u3059\u308b\u3002\u5546\u54c1\u691c\u7d22\u3067\u306f\u3001\u30bf\u30a4\u30c8\u30eb\u3068\u30b3\u30f3\u30c6\u30f3\u30c4\u306b\u95a2\u3059\u308b\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6709\u52b9\u3067\u3001\u79c1\u306f\u307e\u305a\u30b9\u30c8\u30c3\u30d7\u30ef\u30fc\u30c9\u3001\u6700\u5c0f\u5358\u8a9e\u306e\u9577\u3055\u3001\u95a2\u9023\u6027\u3092\u30c6\u30b9\u30c8\u3059\u308b\u3002\u30d5\u30a3\u30eb\u30bf\u30fc\u304cmeta_value\u306b\u5927\u304d\u304f\u4f9d\u5b58\u3059\u308b\u5834\u5408\u306f\u3001\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u8abf\u3079\u305f\u308a\u3001\u7e70\u308a\u8fd4\u3055\u308c\u308b\u5024\u3092\u6b63\u898f\u5316\u3055\u308c\u305f\u30c6\u30fc\u30d6\u30eb\u306b\u4fdd\u5b58\u3057\u3001\u660e\u78ba\u306a <strong>\u9375<\/strong> \u3088\u308a\u3002<\/p>\n\n<h2>wp_options\u306e\u30af\u30ea\u30fc\u30f3\u30a2\u30c3\u30d7\uff1a\u30aa\u30fc\u30c8\u30ed\u30fc\u30c9\u3068\u30c8\u30e9\u30f3\u30b8\u30a8\u30f3\u30c8<\/h2>\n<p>wp_options\u30c6\u30fc\u30d6\u30eb\u306f\u3057\u3070\u3057\u3070 <strong>\u30dc\u30c8\u30eb\u30cd\u30c3\u30af<\/strong>, autoload\u306e\u30a8\u30f3\u30c8\u30ea\u304c\u5236\u5fa1\u4e0d\u80fd\u306a\u307b\u3069\u5897\u3048\u305f\u3068\u304d\u3002\u79c1\u306f\u3001autoload=yes\u3092\u5fc5\u8981\u6700\u5c0f\u9650\u306b\u6291\u3048\u3001\u53e4\u3044\u30c8\u30e9\u30f3\u30b8\u30a7\u30f3\u30c8\u3092\u524a\u9664\u3059\u308b\u3053\u3068\u3067\u3001WordPress\u304c\u8d77\u52d5\u6642\u306b\u8aad\u307f\u8fbc\u3080\u30e1\u30e2\u30ea\u3092\u6e1b\u3089\u3057\u3066\u3044\u308b\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u8ffd\u52a0\u3059\u308b\u3053\u3068\u306f\u3001\u4e00\u8cab\u3057\u305f\u30c7\u30fc\u30bf\u306e\u30e1\u30f3\u30c6\u30ca\u30f3\u30b9\u3068\u8ce2\u660e\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u306b\u6bd4\u3079\u308c\u3070\u3001\u3042\u307e\u308a\u5f79\u306b\u7acb\u3061\u307e\u305b\u3093\u3002\u69cb\u9020\u5316\u3055\u308c\u305f\u5c0e\u5165\u306e\u305f\u3081\u306b\u3001\u79c1\u306f\u6b21\u306e\u30ac\u30a4\u30c9\u3092\u4f7f\u3044\u307e\u3059\u3002 <a href=\"https:\/\/webhosting.de\/ja\/%e3%83%af%e3%83%bc%e3%83%89%e3%83%97%e3%83%ac%e3%82%b9%e3%83%87%e3%83%bc%e3%82%bf%e3%83%99%e3%83%bc%e3%82%b9%e3%81%ae%e6%9c%80%e9%81%a9%e5%8c%96-wpoptions-tips-%e3%83%87%e3%83%bc%e3%82%bf%e3%83%a1\/\">wp_options\u306e\u6700\u9069\u5316<\/a> \u305d\u3057\u3066\u5b9a\u671f\u7684\u306b\u30dc\u30ea\u30e5\u30fc\u30e0\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3002\u5fc5\u8981\u3067\u3042\u308c\u3070\u3001\u3081\u3063\u305f\u306b\u4f7f\u308f\u306a\u3044\u30aa\u30d7\u30b7\u30e7\u30f3\u306f\u5225\u306e\u30c6\u30fc\u30d6\u30eb\u306b\u79fb\u52d5\u3055\u305b\u305f\u308a\u3001\u8a08\u753b\u7684\u306b\u6e1b\u3089\u3057\u3066\u3044\u304f\u3002 <strong>\u6e05\u6383\u4f5c\u696d<\/strong>.<\/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\/01\/wordpress_datenbank_index_7495.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>\u8907\u6570\u5217\u3001\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u3001\u300c\u30ab\u30d0\u30fc\u30ea\u30f3\u30b0\u300d\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6b63\u3057\u304f\u9078\u629e\u3059\u308b\u3002<\/h2>\n<p>\u79c1\u306f\u3001\u30de\u30eb\u30c1\u30fb\u30ab\u30e9\u30e0\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u30ab\u30e9\u30e0\u30fb\u30b7\u30fc\u30b1\u30f3\u30b9\u3092\u3001\u5b9f\u969b\u306e\u30ab\u30e9\u30e0\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306b\u5f93\u3063\u3066\u9078\u629e\u3059\u308b\u3002 <strong>\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0<\/strong> \u3092WHERE\u3067\u6307\u5b9a\u3059\u308b\u3002\u9078\u629e\u7684\u691c\u7d22\u304c\u52b9\u679c\u3092\u767a\u63ee\u3059\u308b\u305f\u3081\u306b\u306f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5148\u982d\u90e8\u5206\u306b\u6700\u3082\u5f37\u3044\u5236\u9650\u304c\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044\u3002\u30bd\u30fc\u30c8\u306b\u3064\u3044\u3066\u306f\u3001\u30bd\u30fc\u30c8\u3059\u308b\u5217\u304c\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u9069\u5207\u306a\u4f4d\u7f6e\u306b\u3042\u308b\u304b\u3069\u3046\u304b\u3001\u307e\u305f\u3001\u305d\u306e\u65b9\u5411\u304c\u9069\u5408\u3057\u3066\u3044\u308b\u304b\u3069\u3046\u304b\u306b\u3088\u3063\u3066\u52b9\u679c\u304c\u7570\u306a\u308a\u307e\u3059\u3002\u30af\u30a8\u30ea\u306b\u5fc5\u8981\u306a\u5168\u3066\u306e\u30ab\u30e9\u30e0\u3092\u542b\u3080\u30ab\u30d0\u30ec\u30c3\u30b8\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306f\u3001\u8ffd\u52a0\u306e\u30c6\u30fc\u30d6\u30eb\u30a2\u30af\u30bb\u30b9\u3092\u56de\u907f\u3057\u3001\u5f85\u3061\u6642\u9593\u3092\u9855\u8457\u306b\u77ed\u7e2e\u3059\u308b\u3002\u307e\u305f\u3001\u53ef\u5909\u6587\u5b57\u5217\u306e\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u3092\u524a\u6e1b\u3057\u3001\u30d0\u30c3\u30d5\u30a1\u30d7\u30fc\u30eb\u3092\u5c0f\u3055\u304f\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u52b9\u7387\u7684<\/strong>.<\/p>\n\n<h2>\u30a2\u30fc\u30ad\u30c6\u30af\u30c1\u30e3\u306e\u554f\u984c\uff1a\u30ad\u30e3\u30c3\u30b7\u30e5\u3001\u30d7\u30fc\u30ea\u30f3\u30b0\u3001\u30b5\u30fc\u30d0\u30fc\u8a2d\u5b9a<\/h2>\n<p>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u6700\u3082\u3046\u307e\u304f\u6a5f\u80fd\u3059\u308b\u306e\u306f\u3001\u6b21\u306e\u3088\u3046\u306b\u7d44\u307f\u5408\u308f\u305b\u305f\u3068\u304d\u3060\u3002 <strong>\u5bfe\u8c61<\/strong>-\u30ad\u30e3\u30c3\u30b7\u30e5 (Redis \u306a\u3069) \u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30af\u30a8\u30ea\u306e\u7e70\u308a\u8fd4\u3057\u3092\u907f\u3051\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u6301\u7d9a\u7684\u306a\u63a5\u7d9a\u51e6\u7406\u3068\u30af\u30ea\u30fc\u30f3\u306a\u30d7\u30fc\u30ea\u30f3\u30b0\u8a2d\u5b9a\u306b\u3088\u308a\u3001PHP\u30ef\u30fc\u30ab\u30fc\u306e\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u6642\u9593\u3092\u77ed\u7e2e\u3057\u307e\u3059\u3002innodb_buffer_pool_size\u306a\u3069\u306eInnoDB\u30d1\u30e9\u30e1\u30fc\u30bf\u3092\u6700\u9069\u5316\u3057\u3001\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3084\u30c7\u30fc\u30bf\u30da\u30fc\u30b8\u304c\u30e1\u30e2\u30ea\u306b\u4fdd\u5b58\u3055\u308c\u308b\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u540c\u69d8\u306b\u91cd\u8981\u306a\u306e\u306f\u3001\u30ea\u30af\u30a8\u30b9\u30c8\u3042\u305f\u308a\u306e\u30aa\u30fc\u30d0\u30fc\u30d8\u30c3\u30c9\u3092\u6291\u3048\u3089\u308c\u308b\u3088\u3046\u306b\u3001\u305f\u304f\u3055\u3093\u306e\u5c0f\u3055\u306a\u30af\u30a8\u30ea\u3067\u306f\u306a\u304f\u3001\u5c11\u6570\u306e\u3088\u304f\u8a2d\u8a08\u3055\u308c\u305f\u30af\u30a8\u30ea\u3092\u4f7f\u3046\u3053\u3068\u3067\u3059\u3002\u30cf\u30fc\u30c9\u30a6\u30a7\u30a2\u3092\u30a2\u30c3\u30d7\u30b0\u30ec\u30fc\u30c9\u3059\u308b\u524d\u306b\u3001\u30af\u30a8\u30ea\u30d7\u30e9\u30f3\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ab\u30d0\u30ec\u30c3\u30b8\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u30ed\u30b8\u30c3\u30af\u3092\u30c1\u30a7\u30c3\u30af\u3057\u307e\u3059\u3002 <strong>\u30ec\u30d0\u30fc<\/strong> \u3092\u63d0\u4f9b\u3059\u308b\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\/01\/wordpress-datenbankindizes-9381.png\" alt=\"\" width=\"1536\" height=\"1024\"\/>\n<\/figure>\n\n\n<h2>WP\u306e\u4e00\u822c\u7684\u306a\u30af\u30a8\u30ea\u30fc\u30d1\u30bf\u30fc\u30f3\u3092\u6b63\u3057\u304f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5316\u3059\u308b<\/h2>\n<p>WordPress\u306e\u5178\u578b\u7684\u306a\u30af\u30a8\u30ea\u306f\u3001\u7e70\u308a\u8fd4\u3055\u308c\u308b\u30d1\u30bf\u30fc\u30f3\u306b\u5f93\u3063\u3066\u3044\u308b\u3002\u79c1\u306f\u4e00\u8cab\u3057\u3066\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\uff1a<\/p>\n<ul>\n  <li>\u7bc4\u56f2\u306e\u524d\u306b\u7b49\u3057\u3044WHERE\u306e\u7d44\u307f\u5408\u308f\u305b\uff1a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3067\u306f\u3001\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u30ab\u30e9\u30e0\u3092\u4e26\u3079\u308b\u3002 <strong>=<\/strong>-\u6761\u4ef6 <strong>\u9593<\/strong>, <strong>&gt;<\/strong>, <strong>&lt;<\/strong> \u307e\u305f\u306fLIKE \u201aabc%\u2018\u3002\u3053\u308c\u306f\u691c\u7d22\u7a7a\u9593\u3092\u5c0f\u3055\u304f\u4fdd\u3061\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5185\u306e\u7bc4\u56f2\u5217 \u201efrom to \u201c\u306b\u5bfe\u3057\u3066\u5b9f\u884c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/li>\n  <li>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u305f ORDER BY \u3092\u30ab\u30d0\u30fc\u3059\u308b: \u30af\u30a8\u30ea\u304c\u7279\u5b9a\u306e post_status \u306b\u5bfe\u3057\u3066 post_date DESC \u3067\u30bd\u30fc\u30c8\u3059\u308b\u5834\u5408\u3001(post_status, post_date DESC) \u306e\u3088\u3046\u306a\u8907\u5408\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002\u6700\u8fd1\u306e MySQL \u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u3067\u306f <strong>\u4e0b\u964d<\/strong> \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30ab\u30e9\u30e0\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3092Filesort\u306f\u907f\u3051\u3066\u3044\u307e\u3059\u3002.<\/li>\n  <li>JOIN\u30d1\u30b9\u3092\u6700\u5c0f\u9650\u306b\u3059\u308b\uff1awp_posts \u2192 wp_postmeta \u3092 post_id \u3067 JOIN \u3059\u308b\u5834\u5408\u3001(post_id, meta_key) \u306f\u7279\u5b9a\u306e\u30ad\u30fc\u306e\u691c\u7d22\u3092\u304b\u306a\u308a\u9ad8\u901f\u5316\u3057\u307e\u3059\u3002\u53cd\u5bfe\u5074\u300d\u3067\u306f\u3001wp_posts\u3067\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3055\u308c\u305f\u30ab\u30e9\u30e0\uff08\u4f8b\u3048\u3070post_status\uff09\u306b\u5bfe\u3059\u308b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u3001\u4e21\u65b9\u306e\u30b9\u30c6\u30c3\u30d7\u3092\u9078\u629e\u7684\u306b\u3059\u308b\u306e\u306b\u5f79\u7acb\u3061\u307e\u3059\u3002.<\/li>\n  <li>\u5927\u91cf\u306e\u5834\u5408\u306fIN\u306e\u4ee3\u308f\u308a\u306bEXISTS\u3092\u4f7f\u7528\u3059\u308b\uff1a\u30b5\u30d6\u30af\u30a8\u30ea\u304c\u591a\u304f\u306e\u5024\u3092\u63d0\u4f9b\u3059\u308b\u5834\u5408\u3001\u30bb\u30de\u30f3\u30c6\u30a3\u30c3\u30af\u306b\u540c\u4e00\u306eEXISTS\u30d0\u30ea\u30a2\u30f3\u30c8\u306f\u3057\u3070\u3057\u3070\u3088\u308a\u6709\u5229\u3067\u3042\u308a\u3001\u3088\u308a\u826f\u3044\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5229\u7528\u3092\u53ef\u80fd\u306b\u3057\u307e\u3059\u3002.<\/li>\n<\/ul>\n\n<h2>\u6700\u65b0\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fb\u30c1\u30e5\u30fc\u30cb\u30f3\u30b0\u306e\u305f\u3081\u306eMySQL\u6a5f\u80fd<\/h2>\n<p>\u73fe\u5728\u306eMySQL\/MariaDB\u306e\u30d0\u30fc\u30b8\u30e7\u30f3\u306b\u306f\u3001\u79c1\u304c\u7279\u306b\u4f7f\u7528\u3057\u3066\u3044\u308b\u95a2\u6570\u304c\u7528\u610f\u3055\u308c\u3066\u3044\u308b\uff1a<\/p>\n<ul>\n  <li><strong>EXPLAIN ANALYZE<\/strong> \u306f\u30d7\u30e9\u30f3\u30b9\u30c6\u30c3\u30d7\u3054\u3068\u306e\u5b9f\u969b\u306e\u30e9\u30f3\u30bf\u30a4\u30e0\u3092\u793a\u3057\u3066\u3044\u307e\u3059\u3002\u30d7\u30e9\u30f3\u304c\u9069\u5408\u3057\u3066\u3044\u308b\u306e\u304b\u3001\u7d71\u8a08\u304c\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u3092\u60d1\u308f\u305b\u308b\u306e\u304b\u304c\u308f\u304b\u308a\u307e\u3059\u3002.<\/li>\n  <li><strong>\u76ee\u306b\u898b\u3048\u306a\u3044\u6307\u6a19<\/strong> \u30c6\u30b9\u30c8\u306b\u4f7f\u3063\u3066\u3044\u307e\u3059\uff1a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4e00\u6642\u7684\u306b\u4e0d\u53ef\u8996\u306b\u3057\u3066\u3001\u30af\u30a8\u30ea\u304c\u9045\u304f\u306a\u308b\u304b\u3069\u3046\u304b\u3092\u89b3\u5bdf\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u30d0\u30e9\u30b9\u30c8\u3092\u5b89\u5168\u306b\u53d6\u308a\u9664\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002.<\/li>\n  <li><strong>\u6a5f\u80fd\uff0f\u751f\u6210\u30b3\u30e9\u30e0<\/strong>LOWER(email)\u3092\u6bd4\u8f03\u3059\u308b\u30af\u30a8\u30ea\u3067\u306f\u3001\u6b63\u898f\u5316\u3055\u308c\u305f\u8868\u73fe\u3067\u751f\u6210\u3055\u308c\u305f\u30ab\u30e9\u30e0\u3092\u4f5c\u6210\u3057\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f5c\u6210\u3057\u307e\u3059\u3002\u3053\u3046\u3059\u308b\u3053\u3068\u3067\u3001WHERE\u306b\u95a2\u6570\u304c\u3042\u3063\u3066\u3082\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f7f\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30d2\u30b9\u30c8\u30b0\u30e9\u30e0\u3068\u7d71\u8a08<\/strong>\u975e\u5e38\u306b\u4e0d\u5747\u8861\u306a\u5206\u5e03\u306e\u5834\u5408\u3001\u30aa\u30d7\u30c6\u30a3\u30de\u30a4\u30b6\u30fc\u304c\u9078\u629e\u6027\u3092\u73fe\u5b9f\u7684\u306b\u63a8\u5b9a\u3067\u304d\u308b\u3088\u3046\u306b\u7d71\u8a08\u91cf\u3092\u66f4\u65b0\u3059\u308b\u3002.<\/li>\n<\/ul>\n\n<h2>\u30c0\u30a6\u30f3\u30bf\u30a4\u30e0\u306a\u3057\u306e\u5909\u66f4\uff1a\u5b89\u5168\u306a\u30c7\u30d7\u30ed\u30a4\u3068\u30ed\u30fc\u30eb\u30d0\u30c3\u30af<\/h2>\n<p>\u79c1\u306f\u3001\u30b5\u30a4\u30c8\u304c\u30aa\u30f3\u30e9\u30a4\u30f3\u3092\u7dad\u6301\u3067\u304d\u308b\u3088\u3046\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u5909\u66f4\u3092\u8a08\u753b\u3057\u307e\u3059\u3002\u8ca0\u8377\u306e\u4f4e\u3044\u79fb\u884c\u30a6\u30a3\u30f3\u30c9\u30a6\u3092\u4f7f\u7528\u3057\u3001\u30aa\u30f3\u30e9\u30a4\u30f3\u5bfe\u5fdc\u306eALTER\u30d0\u30ea\u30a2\u30f3\u30c8\u306b\u4f9d\u5b58\u3057\u3001\u305d\u306e\u9593\u306e\u5f85\u3061\u6642\u9593\u3068\u30ed\u30c3\u30af\u5f85\u3061\u6642\u9593\u3092\u76e3\u8996\u3057\u307e\u3059\u3002\u8ffd\u52a0\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u30d0\u30c3\u30d5\u30a1\u30d7\u30fc\u30eb\u3092\u5727\u8feb\u3057\u306a\u3044\u3088\u3046\u306b\u3001\u4e8b\u524d\u306b\u5fc5\u8981\u306a\u30e1\u30e2\u30ea\u3092\u6e2c\u5b9a\u3057\u3066\u304a\u304d\u307e\u3059\u3002\u304d\u308c\u3044\u306a\u30ed\u30fc\u30eb\u30d0\u30c3\u30af\u306e\u305f\u3081\u306b\u3001DROP\/CREATE\u30b9\u30af\u30ea\u30d7\u30c8\u3068\u305d\u308c\u305e\u308c\u306e\u30b3\u30e1\u30f3\u30c8\u3092\u65e5\u4ed8\u3068\u3068\u3082\u306b\u624b\u5143\u306b\u7f6e\u3044\u3066\u304a\u304d\u3001\u3059\u3050\u306b\u6b21\u306e\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3057\u3066\u304a\u304f\u3002 <strong>\u5f15\u304d\u53d6\u308b<\/strong> \u7f36\u3002<\/p>\n\n<h2>WooCommerce\u3092\u5177\u4f53\u7684\u306b: HPOS\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3001\u30d5\u30a3\u30eb\u30bf\u30fc<\/h2>\n<p>\u6700\u65b0\u306eWooCommerce\u30bb\u30c3\u30c8\u30a2\u30c3\u30d7\u3067\u306f <strong>\u30aa\u30fc\u30c0\u30fc\u30c6\u30fc\u30d6\u30eb\u3068\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u30c6\u30fc\u30d6\u30eb<\/strong> \u304c\u5927\u304d\u306a\u5f79\u5272\u3092\u679c\u305f\u3057\u3066\u3044\u307e\u3059\u3002\u79c1\u306f\u3001\u30b9\u30c6\u30fc\u30bf\u30b9\u3084\u65e5\u4ed8\u306b\u3088\u308b\u6ce8\u6587\u6982\u8981\u306e\u30af\u30a8\u30ea\u306b\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6301\u305f\u305b\u3001\u7ba1\u7406\u8005\u30ea\u30b9\u30c8\u3084\u30ec\u30dd\u30fc\u30c8\u304c\u7d20\u65e9\u304f\u958b\u304f\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u5c5e\u6027\u3001\u4fa1\u683c\u3001\u5728\u5eab\u30ec\u30d9\u30eb\u306b\u57fa\u3065\u304f\u5546\u54c1\u30d5\u30a3\u30eb\u30bf\u30fc\u306f\u3001\u7279\u5b9a\u306e\u30ad\u30fc\u3092\u6301\u3064\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u30c6\u30fc\u30d6\u30eb\u304c\u5f79\u7acb\u3061\u307e\u3059\u3002\u30d5\u30a3\u30eb\u30bf\u30fc\u304cmeta_value\u306b\u8ca0\u62c5\u3092\u304b\u3051\u308b\u5834\u5408\u3001\u30b3\u30f3\u30bb\u30d7\u30c8\u306e\u5909\u66f4\u304c\u5f79\u306b\u7acb\u3061\u307e\u3059\u3002\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u5c5e\u6027\u3092\u6b63\u898f\u5316\u3059\u308b\u304b\u3001\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u30c6\u30fc\u30d6\u30eb\u3067\u5b9f\u4f53\u5316\u3059\u308b\u3053\u3068\u3067\u3001wp_postmeta\u306e\u8ca0\u62c5\u3092\u8efd\u6e1b\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u30de\u30eb\u30c1\u30b5\u30a4\u30c8\u3068\u5927\u898f\u6a21\u30a4\u30f3\u30b9\u30c8\u30fc\u30eb<\/h2>\n<p>\u30de\u30eb\u30c1\u30b5\u30a4\u30c8\u74b0\u5883\u3067\u306f\u3001WordPress\u306f\u30b5\u30a4\u30c8\u3054\u3068\u306b\u30c6\u30fc\u30d6\u30eb\u3092\u5206\u3051\u3066\u30b9\u30b1\u30fc\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002\u3053\u308c\u306b\u3088\u308a\u3001\u500b\u3005\u306e\u30c6\u30fc\u30d6\u30eb\u3092\u5c0f\u3055\u304f\u4fdd\u3064\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002 <strong>\u9078\u629e\u6027<\/strong> \u3068\u30ad\u30e3\u30c3\u30b7\u30e5\u30fb\u30d2\u30c3\u30c8\u3002\u79c1\u306f\u3001\u6e96\u5099\u3055\u308c\u305f\u96c6\u8a08\u306e\u306a\u3044\u30b0\u30ed\u30fc\u30d0\u30eb\u306a\u30af\u30ed\u30b9\u30b5\u30a4\u30c8\u30ec\u30dd\u30fc\u30c8\u306f\u907f\u3051\u3066\u3044\u308b\u3002\u591a\u304f\u306e\u30b5\u30a4\u30c8\u3092\u8981\u7d04\u3059\u308b\u5fc5\u8981\u304c\u3042\u308b\u5834\u5408\u306f\u3001\u5b9a\u671f\u7684\u306b\u96c6\u8a08\u30c6\u30fc\u30d6\u30eb\u3092\u6e80\u305f\u3057\u3001\u30af\u30a8\u30ea\u30fc\u30d1\u30b9\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u30bf\u30fc\u30b2\u30c3\u30c8\u306b\u3057\u3066\u4f5c\u696d\u3059\u308b\u3002.<\/p>\n\n<h2>\u6587\u5b57\u30bb\u30c3\u30c8\u3001\u7167\u5408\u9806\u5e8f\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u9577<\/h2>\n<p>\u3068\u4e00\u7dd2\u306b <strong>utf8mb4<\/strong> \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30fb\u30ad\u30fc\u306e\u5e45\u306f\u5927\u304d\u304f\u306a\u308b\u3002\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3042\u305f\u308a\u306e3072\u30d0\u30a4\u30c8\u5236\u9650\u304c\u969c\u5bb3\u306b\u306a\u3089\u306a\u3044\u3088\u3046\u306b\u3001\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u30fb\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\uff08\u4f8b\u3048\u3070(meta_key(20))\uff09\u3092\u610f\u56f3\u7684\u306b\u8a08\u753b\u3057\u3066\u3044\u308b\u3002\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u691c\u7d22\u3067\u306f\u3001\u9069\u5207\u306a\u7167\u5408\u9806\u5e8f\u3092\u9078\u629e\u3059\u308b\u3002\u305d\u308c\u3067\u3082\u6b63\u898f\u5316\uff08LOWER\/UPPER\uff09\u3092\u6b63\u78ba\u306b\u6bd4\u8f03\u3057\u305f\u3044\u5834\u5408\u306f\u3001WHERE\u3067\u95a2\u6570\u306e\u4ee3\u308f\u308a\u306b\u751f\u6210\u30ab\u30e9\u30e0\u3092\u4f7f\u7528\u3059\u308b\u3002\u9577\u3044\u30c6\u30ad\u30b9\u30c8\u30d5\u30a3\u30fc\u30eb\u30c9\u306e\u5834\u5408\u3001\u3084\u307f\u304f\u3082\u306b\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4f5c\u6210\u3059\u308b\u3053\u3068\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u9ad8\u3044\u30ab\u30fc\u30c7\u30a3\u30ca\u30ea\u30c6\u30a3\u3092\u9054\u6210\u3059\u308b\u305f\u3081\u306b\u3069\u308c\u304f\u3089\u3044\u306e\u63a5\u982d\u8f9e\u304c\u3042\u308c\u3070\u5341\u5206\u304b\u3092\u6e2c\u5b9a\u3057\u3001\u305d\u308c\u306b\u5fdc\u3058\u3066\u63a5\u982d\u8f9e\u3092\u9078\u629e\u3057\u307e\u3059\u3002.<\/p>\n\n<h2>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u4e0a\u66f8\u304d\u3059\u308b\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h2>\n<p>\u30d1\u30bf\u30fc\u30f3\u306b\u3088\u3063\u3066\u306f\u3001\u591a\u304f\u306e\u6642\u9593\u3092\u8cbb\u3084\u3057\u3001\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u6d3b\u7528\u3092\u59a8\u3052\u308b\u3082\u306e\u3082\u3042\u308b\uff1a<\/p>\n<ul>\n  <li><strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u5217\u306b\u5bfe\u3059\u308b\u95a2\u6570<\/strong> \u306eWHERE\uff08\u4f8b\u3048\u3070DATE(post_date)\uff09\u3067\u3001\u65e2\u5b58\u306e\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u4f7f\u7528\u3055\u308c\u306a\u3044\u3088\u3046\u306b\u3057\u3066\u3044\u307e\u3059\u3002\u305d\u306e\u4ee3\u308f\u308a\u306b\u3001\u7bc4\u56f2\uff08post_date &gt;= ... AND post_date &lt; ...\uff09\u3092\u4f7f\u3063\u3066\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3057\u307e\u3059\u3002.<\/li>\n  <li><strong>\u30ea\u30fc\u30c9\u3059\u308b\u30ef\u30a4\u30eb\u30c9\u30ab\u30fc\u30c9<\/strong> \u306eLIKE (\u201ac\u2018)\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u53ef\u80fd\u3067\u306f\u3042\u308a\u307e\u305b\u3093\u3002\u73fe\u5728\u3001\u518d\u8a08\u753b\u4e2d\u3067\u3059\uff08\u30d7\u30ec\u30d5\u30a3\u30c3\u30af\u30b9\u691c\u7d22\u3001\u30d5\u30eb\u30c6\u30ad\u30b9\u30c8\u3001\u305d\u306e\u4ed6\u306e\u30c7\u30fc\u30bf\u69cb\u9020\uff09\u3002.<\/li>\n  <li><strong>\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u304c\u591a\u3059\u304e\u308b<\/strong> \u540c\u3058\u5217\u3001\u307e\u305f\u306f\u540c\u3058\u5de6\u63a5\u982d\u8f9e\u306f\u3001\u307b\u3068\u3093\u3069\u5f79\u306b\u7acb\u305f\u306a\u3044\u304c\u3001\u57f7\u7b46\u30b3\u30b9\u30c8\u3092\u5897\u52a0\u3055\u305b\u308b\u3002\u79c1\u306f\u91cd\u8907\u3092\u7d71\u5408\u3059\u308b\u3002.<\/li>\n  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