{"id":3411,"date":"2023-05-16T11:54:00","date_gmt":"2023-05-16T02:54:00","guid":{"rendered":"https:\/\/yorozu.cloudfree.jp\/wordpress\/?p=3411"},"modified":"2025-07-20T07:56:57","modified_gmt":"2025-07-19T22:56:57","slug":"%e3%83%88%e3%83%a9%e3%83%b3%e3%82%b6%e3%82%af%e3%82%b7%e3%83%a7%e3%83%b3%e3%81%ae%e5%90%8c%e6%99%82%e6%9b%b4%e6%96%b0","status":"publish","type":"post","link":"https:\/\/yorozu.cloudfree.jp\/wordpress\/?p=3411","title":{"rendered":"\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u540c\u6642\u66f4\u65b0"},"content":{"rendered":"\n<h4 class=\"wp-block-heading\"><strong>\uff11\uff0e\u30c0\u30fc\u30c6\u30a3\u30ea\u30fc\u30c9\uff08Dirty Read\uff09<\/strong><\/h4>\n\n\n\n<p>\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u51e6\u7406\u306e\u6700\u4e2d\u306b\u30b9\u30c8\u30ec\u30fc\u30b8\u306b\u66f8\u304d\u8fbc\u3093\u3060\u672a\u78ba\u5b9a\u306a\u30c7\u30fc\u30bf\u3092\u3001<br>\u3000\u3000\u3000\u5225\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u8aad\u307f\u8fbc\u3093\u3067\u4f7f\u7528\u3057\u3066\u3057\u307e\u3046<br><br>\u3000\u5bfe\u5fdc\u7b56<br>\u3000\u3000\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u5206\u96e2\u30ec\u30d9\u30eb \u201cREAD COMMITTED\u201d \u304c\u5fc5\u8981\u306b\u306a\u308b<br>\u3000\u3000\u3000\u3000\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u51e6\u7406\u4e2d\u306b\u3088\u3063\u3066\u5909\u66f4\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306f<br>\u3000\u3000\u3000\u3000\u3000\u305d\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u7d42\u4e86\u3059\u308b\u307e\u3067\u4ed6\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304b\u3089\u8aad\u307f<br>\u3000\u3000\u3000\u3000\u3000\u53d6\u308c\u306a\u3044\u3088\u3046\u30ed\u30c3\u30af\u3059\u308b\u306a\u3069\u306e\u5bfe\u7b56\u304c\u8981\u6c42\u3055\u308c\u308b<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\uff12\uff0e\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\uff08Dead Lock\uff09<\/strong><\/h4>\n\n\n\n<p>\u3000\u304a\u4e92\u3044\u304c\u30ed\u30c3\u30af\u89e3\u9664\u5f85\u3061\u72b6\u614b\u3068\u306a\u308a\u3001\u3069\u3061\u3089\u3082\u51e6\u7406\u304c\u9032\u884c\u3067\u304d\u306a\u304f\u306a\u308b\u72b6\u614b<br>\u3000\u3000\u3000\u307e\u305a\u306f\u3058\u3081\u306b\u300c\u8cc7\u6e90\u300d\u3092\u30ed\u30c3\u30af\u3059\u308b<br>\u3000\u3000\u3000\u30ed\u30c3\u30af\u3055\u308c\u305f\u300c\u8cc7\u6e90\u300d\u306f\u30ed\u30c3\u30af\u304c\u89e3\u9664\u3055\u308c\u308b\u307e\u3067\u3001<br>\u3000\u3000\u3000\u3000\u3000\u4ed6\u306e\u30bf\u30b9\u30af\uff08\u51e6\u7406\uff09\u304b\u3089\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u306a\u304f\u306a\u308b\u306e\u3067<br>\u3000\u3000\u3000\u51e6\u7406\u304c\u7d42\u308f\u3063\u305f\u3089\u30ed\u30c3\u30af\u3092\u89e3\u9664\u3059\u308b<br><br>\u3000\u3000\u3000\u89e3\u9664\u3057\u306a\u3044\u3068\u3001\u4e92\u3044\u306b\u30ed\u30c3\u30af\u304c\u89e3\u9664\u3055\u308c\u308b\u306e\u3092\u5f85\u3061\u7d9a\u3051\u3066\u3057\u307e\u3046\u3042<br>\u3000\u3000\u3000\u3000\u3000\u3053\u306e\u72b6\u614b\u3092\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u3068\u3044\u3046<br><br>\u3000\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u304c\u767a\u751f\u3059\u308b\u3068\u51e6\u7406\u304c\u3068\u307e\u3063\u3066\u3057\u307e\u3046<br><br>\u3000\u5bfe\u5fdc\u7b56<br>\u3000\u3000\u3000\u30c7\u30c3\u30c9\u30ed\u30c3\u30af\u3092\u56de\u907f\u3059\u308b\u306b\u306f<br>\u3000\u3000\u3000\u3000\u3000\u8cc7\u6e90\u306e\u30ed\u30c3\u30af\u9806\u5e8f\u3092\u4e21\u65b9\u306e\u30bf\u30b9\u30af\u3067\u63c3\u3048\u308b<br>\u3000\u3000\u3000\u3000\u3000\u4e0d\u5fc5\u8981\u306b\u30ed\u30c3\u30af\u3092\u639b\u3051\u306a\u3044<br>\u3000\u3000\u3000\u3000\u3000\u53ef\u80fd\u306a\u9650\u308a\u884c\u30ed\u30c3\u30af\u3092\u63a1\u7528\u3059\u308b\uff08\u5168\u4f53\u3067\u306f\u306a\u304f\u3001\u884c\u90e8\u5206\u306e\u307f\u30ed\u30c3\u30af\uff09<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\uff13\uff0e\u30ce\u30f3\u30ea\u30d4\u30fc\u30bf\u30d6\u30eb\u30ea\u30fc\u30c9(Non-Repeatable Read)<\/strong><\/h4>\n\n\n\n<p>\u3000\u540c\u3058\u30ec\u30b3\u30fc\u30c9\u3092\u4f55\u5ea6\u3082\u7e70\u308a\u8fd4\u3057\u8aad\u307f\u51fa\u3059\u51e6\u7406\u306e\u5834\u5408<br>\u3000\u3000\u3000\u9014\u4e2d\u3067\u4ed6\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u304c\u5185\u5bb9\u3092\u66f4\u65b0\u3057\u3066\u3057\u307e\u3046<br><br>\u3000\u5bfe\u5fdc\u7b56<br>\u3000\u3000\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u5206\u96e2\u30ec\u30d9\u30eb \u201cREPEATABLE READ\u201d \u304c\u5fc5\u8981\u306b\u306a\u308b\u306e\u3067<br>\u3000\u3000\u3000\u3000\u30002\u756a\u76ee\u306b\u9ad8\u3044\u30ec\u30d9\u30eb\u3067\u3042\u308a\u3001\u305d\u306e\u5206\u3060\u3051\u6027\u80fd\u306f\u4f4e\u304f\u306a\u308b<br><br>\u3000\u3000\u3000\u51e6\u7406\u306e\u7279\u6027\u3084\u30b3\u30b9\u30c8\u7b49\u306e\u517c\u306d\u5408\u3044\u3067\u5b8c\u5168\u306b\u9632\u3050\u5fc5\u8981\u304c\u3042\u308b\u304b\u5224\u65ad\u3059\u308b\u3000<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\uff14\uff0e\u30ed\u30b9\u30c8\u30a2\u30c3\u30d7\u30c7\u30fc\u30c8\uff08Lost Update\uff09<\/strong><\/h4>\n\n\n\n<p>\u3000\u8907\u6570\u306e\u30e6\u30fc\u30b6\u30fc\u304c\u540c\u6642\u306b\u30a2\u30af\u30bb\u30b9\u3057\u305f\u3068\u304d\u306b\u8d77\u3053\u308b<br>\u3000\u3000\u3000\u66f4\u65b0\u3057\u305f\u306f\u305a\u306e\u30c7\u30fc\u30bf\u304c\u300c\u5931\u308f\u308c\u3066\u3057\u307e\u3046\u300d\u72b6\u614b<br><br>\u3000\u5bfe\u5fdc\u7b56<br>\u3000\u3000\u3000\u697d\u89b3\u30ed\u30c3\u30af(Optimistic Locking)<br>\u3000\u3000\u3000\u3000\u3000\u540c\u6642\u30a2\u30af\u30bb\u30b9\u306f\u3042\u307e\u308a\u8d77\u304d\u306a\u3044\u3060\u308d\u3046\u3068\u3044\u3046\u697d\u89b3\u7684\u306a\u30ed\u30c3\u30af<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u306e\u540c\u6642\u66f4\u65b0\u304c\u4f4e\u3044\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u8aad\u307f\u53d6\u308a\u64cd\u4f5c\u304c\u591a\u304f\u3001\u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\u304c\u5c11\u306a\u3044\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000SNS\u7b49\u3067\u30e6\u30fc\u30b6\u30fc\u304c\u6295\u7a3f\u3084\u30b3\u30e1\u30f3\u30c8\u3092\u7de8\u96c6\u3059\u308b\u5834\u5408\u306b\u6709\u52b9<br><br>\u3000\u3000\u3000\u3000\u3000\u5404\u30c7\u30fc\u30bf\u30ec\u30b3\u30fc\u30c9\u306b\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u3084\u30bf\u30a4\u30e0\u30b9\u30bf\u30f3\u30d7\u3092\u4ed8\u4e0e\u3059\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u304c\u3044\u3064\u66f4\u65b0\u3055\u308c\u305f\u304b\u3092\u8ffd\u8de1\u3067\u304d\u308b<br>\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u3092\u66f4\u65b0\u3059\u308b\u969b\u306b\u306f\u4e8b\u524d\u306b\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u7b49\u3092\u8aad\u307f\u8fbc\u3080<br>\u3000\u3000\u3000\u3000\u3000\u66f4\u65b0\u3059\u308b\u969b\u306b\u3082\u3046\u4e00\u5ea6\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u7b49\u3092\u8aad\u307f\u8fbc\u3080<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30d0\u30fc\u30b8\u30e7\u30f3\u756a\u53f7\u7b49\u304c\u5909\u308f\u3063\u3066\u3044\u308c\u3070\u3001\u7af6\u5408\u304c\u3042\u3063\u305f\u3068\u898b\u306a\u3059<br><br>\u3000\u3000\u3000\u3000\u3000\u7af6\u5408\u304c\u691c\u51fa\u3055\u308c\u305f\u5834\u5408\u3001\u901a\u5e38\u306f\u66f4\u65b0\u3092\u62d2\u5426\u3057<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u6700\u65b0\u306e\u30c7\u30fc\u30bf\u306b\u57fa\u3065\u3044\u3066\u518d\u5ea6\u66f4\u65b0\u51e6\u7406\u3092\u884c\u3046<br><br>\u3000\u3000\u3000\u3000\u3000\u5229\u70b9<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u5168\u4f53\u3078\u306e\u30ed\u30c3\u30af\u3067\u306f\u306a\u3044\u305f\u3081<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30b7\u30b9\u30c6\u30e0\u306e\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u304c\u5411\u4e0a\u3059\u308b<br>\u3000\u3000\u3000\u3000\u3000\u6b20\u70b9<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u7af6\u5408\u304c\u983b\u7e41\u306b\u767a\u751f\u3059\u308b\u74b0\u5883\u3067\u306f\u518d\u8a66\u884c\u304c\u5897\u3048\u52b9\u7387\u304c\u4f4e\u4e0b\u3059\u308b<br><br>\u3000\u3000\u3000\u60b2\u89b3\u30ed\u30c3\u30af\u00a0(Pessimistic locking)<br>\u3000\u3000\u3000\u3000\u3000\u540c\u6642\u30a2\u30af\u30bb\u30b9\u304c\u983b\u7e41\u306b\u8d77\u304d\u308b\u3060\u308d\u3046\u3068\u3044\u3046\u60b2\u89b3\u7684\u306a\u30ed\u30c3\u30af<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u540c\u3058\u30c7\u30fc\u30bf\u306b\u5bfe\u3057\u540c\u6642\u66f4\u65b0\u306e\u53ef\u80fd\u6027\u304c\u9ad8\u3044\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u304c\u975e\u5e38\u306b\u91cd\u8981\u3067\u3001<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u7af6\u5408\u306b\u3088\u308b\u30ea\u30b9\u30af\u3092\u6700\u5c0f\u9650\u306b\u6291\u3048\u305f\u3044\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u51e6\u7406\u6642\u9593\u304c\u9577\u6642\u9593\u306e\u5834\u5408\u306f\u30c7\u30fc\u30bf\u4fdd\u8b77\u306e\u305f\u3081\u306b\u306f\u6709\u52b9<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u66f8\u304d\u8fbc\u307f\u64cd\u4f5c\u304c\u983b\u7e41\u306b\u884c\u308f\u308c\u308b\u5834\u5408\u306b\u9069\u3057\u3066\u3044\u308b<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u9280\u884c\u306e\u53e3\u5ea7\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u8cc7\u91d1\u79fb\u52d5\u306b\u6709\u52b9<br><br>\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u306b\u30a2\u30af\u30bb\u30b9\u3057\u3001\u4ed6\u304b\u3089\u306e\u30a2\u30af\u30bb\u30b9\u304c\u3067\u304d\u306a\u3044\u3088\u3046\u306b\u30ed\u30c3\u30af\u3059\u308b<br>\u3000\u3000\u3000\u3000\u3000\u30ed\u30c3\u30af\u306f\u30c7\u30fc\u30bf\u306e\u66f4\u65b0\u304c\u5b8c\u4e86\u3059\u308b\u307e\u3067\u7d99\u7d9a\u3059\u308b<br>\u3000\u3000\u3000\u3000\u3000\u60b2\u89b3\u30ed\u30c3\u30af\u306f\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3092\u4fdd\u8b77\u3059\u308b\u305f\u3081\u306b\u4f7f\u7528\u3055\u308c\u308b<br><br>\u3000\u3000\u3000\u3000\u3000\u5229\u70b9<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c7\u30fc\u30bf\u306e\u6574\u5408\u6027\u3068\u5b89\u5168\u6027\u304c\u5f37\u5316\u3055\u308c\u30c7\u30fc\u30bf\u306e\u54c1\u8cea\u304c\u5411\u4e0a\u3059\u308b<br><br>\u3000\u3000\u3000\u3000\u3000\u6b20\u70b9<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30ed\u30c3\u30af\u306b\u3088\u3063\u3066\u5168\u4f53\u306e\u30b9\u30eb\u30fc\u30d7\u30c3\u30c8\u304c\u4f4e\u4e0b\u3059\u308b<\/p>\n\n\n\n<h4 class=\"wp-block-heading\"><strong>\uff15\uff0e\u88dc\u8db3<\/strong><\/h4>\n\n\n\n<p>\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u5206\u96e2\u30ec\u30d9\u30eb\u306b\u3064\u3044\u3066<br>\u3000\u3000\u3000\u3069\u306e\u7a0b\u5ea6\u306e\u6c34\u6e96\u3067\u4e21\u7acb\uff08\u59a5\u5354\uff09\u3059\u308b\u304b\u3092\u8868\u3059<br>\u3000\u3000\u3000\u3000\u3000\u6700\u3082\u72ec\u7acb\u6027\u306e\u9ad8\u3044\u300cSERIALIZABLE\u300d\u304b\u3089<br>\u3000\u3000\u3000\u3000\u3000\u6700\u3082\u4f4e\u3044\u300cREAD UNCOMMITED\u300d\u307e\u3067\uff14\u6bb5\u968e\u304c\u5b9a\u7fa9\u3055\u308c\u3066\u3044\u308b<br><br>\u3000\u3000\u3000SERIALIZABLE<br>\u3000\u3000\u3000\u3000\u3000\u6700\u3082\u72ec\u7acb\u6027\uff08\u5b89\u5168\u6027\uff09\u304c\u9ad8\u3044\u5206\u96e2\u30ec\u30d9\u30eb<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u3092\u9806\u756a\u306b\u5b9f\u884c\uff08\u76f4\u5217\u5316\uff09\u3057\u305f\u306e\u3068\u540c\u3058\u69d8\u306b\u3001<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u4ed6\u306e\u30c8\u30e9\u30f3\u30b6\u30af\u30b7\u30e7\u30f3\u306e\u30c7\u30fc\u30bf\u66f4\u65b0\u306e\u5f71\u97ff\u3092\u307e\u3063\u305f\u304f\u53d7\u3051\u306a\u3044<br>\u3000\u3000\u3000\u3000\u3000\u6700\u3082\u6027\u80fd\u306f\u4f4e\u3044<br>\u3000\u3000\u3000\u3000\u3000\u3000\u3000\u30a2\u30af\u30bb\u30b9\u304c\u7af6\u5408\u3059\u308b\u3068\u300c\u5148\u5ba2\u300d\u306e\u7d42\u4e86\u3092\u5f85\u305f\u306a\u3051\u308c\u3070\u306a\u3089\u306a\u3044<br><br>\u3000\u3000\u3000REPEATABLE 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