{"id":10006313,"date":"2022-08-25T12:47:14","date_gmt":"2022-08-25T04:47:14","guid":{"rendered":"https:\/\/ityet.com\/?p=10006313"},"modified":"2022-08-25T12:47:14","modified_gmt":"2022-08-25T04:47:14","slug":"%e8%af%a6%e8%a7%a3mysql%e9%9a%94%e7%a6%bb%e7%ba%a7%e5%88%ab","status":"publish","type":"post","link":"https:\/\/itmax.cn\/?p=10006313","title":{"rendered":"\u8be6\u89e3MySQL\u9694\u79bb\u7ea7\u522b"},"content":{"rendered":"<blockquote><p>\u4e00\u4e2a\u4e8b\u52a1\u5177\u6709<code>ACID<\/code>\u7279\u6027\uff0c\u4e5f\u5c31\u662f\uff08Atomicity\u3001Consistency\u3001Isolation\u3001Durability\uff0c\u5373<code>\u539f\u5b50\u6027<\/code>\u3001<code>\u4e00\u81f4\u6027<\/code>\u3001<code>\u9694\u79bb\u6027<\/code>\u3001<code>\u6301\u4e45\u6027<\/code>\uff09\uff0c\u672c\u6587\u4e3b\u8981\u8bb2\u89e3\u4e00\u4e0b\u5176\u4e2d\u7684<code>Isolation<\/code>\uff0c\u4e5f\u5c31\u662f\u4e8b\u52a1\u7684<code>\u9694\u79bb\u6027<\/code>\u3002<\/p><\/blockquote>\n<h2>\u6982\u8ff0<\/h2>\n<p>\u56db\u79cd\u9694\u79bb\u7ea7\u522b\u5206\u522b\u662f\uff1a<\/p>\n<ul>\n<li>\n<p><code>\u8bfb\u672a\u63d0\u4ea4\uff08read uncommitted\uff09<\/code><\/p>\n<ul>\n<li>\u4e00\u4e2a\u4e8b\u52a1\u8fd8\u6ca1\u63d0\u4ea4\u65f6\uff0c\u5b83\u4fee\u6539\u7684\u6570\u636e\u90fd\u53ef\u4ee5\u88ab\u522b\u7684\u4e8b\u7269\u770b\u5230\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><code>\u8bfb\u5df2\u63d0\u4ea4(read committed)<\/code><\/p>\n<ul>\n<li>\u4e00\u4e2a\u4e8b\u52a1\u63d0\u4ea4\u4e4b\u540e\uff0c\u5b83\u4fee\u6539\u7684\u6570\u636e\u624d\u4f1a\u88ab\u522b\u7684\u4e8b\u7269\u770b\u5230\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><code>\u53ef\u91cd\u590d\u8bfb(repeatable read)<\/code><\/p>\n<ul>\n<li>\u4e00\u4e2a\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u770b\u5230\u7684\u6570\u636e\uff0c\u603b\u662f\u548c\u8fd9\u4e2a\u4e8b\u52a1\u5f00\u542f\u65f6\u770b\u5230\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\u3002\u5728\u53ef\u91cd\u590d\u8bfb\u7684\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u672a\u63d0\u4ea4\u7684\u4e8b\u52a1\u5bf9\u5176\u4ed6\u4e8b\u52a1\u4e5f\u662f\u4e0d\u53ef\u89c1\u7684\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><code>\u4e32\u884c\u5316(serializable)<\/code><\/p>\n<ul>\n<li>\u6570\u636e\u7684<code>\u8bfb<\/code>\u548c<code>\u5199<\/code>\u90fd\u4f1a<code>\u52a0\u9501<\/code>\uff0c<code>\u8bfb<\/code>\u4f1a\u52a0<code>\u8bfb\u9501<\/code>\uff0c<code>\u5199<\/code>\u4f1a\u52a0<code>\u5199\u9501<\/code>\u3002\u5f53\u9047\u5230\u8bfb\u5199\u9501\u51b2\u7a81\u65f6\uff0c\u540e\u8bbf\u95ee\u7684\u4e8b\u52a1\u5fc5\u987b\u7b49\u524d\u4e00\u4e2a\u4e8b\u52a1\u6267\u884c\u5b8c\u6210\u540e\uff0c\u518d\u7ee7\u7eed\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<blockquote><p>\u4ee5\u4e0a\u56db\u79cd\u9694\u79bb\u7ea7\u522b\uff0c\u7531\u4e0a\u5f80\u4e0b\u9694\u79bb\u5f3a\u5ea6\u8d8a\u6765\u8d8a\u5927\uff0c\u4f46\u662f\u6267\u884c\u6548\u7387\u4f1a\u968f\u4e4b\u964d\u4f4e\u3002\u5728\u8bbe\u7f6e\u9694\u79bb\u7ea7\u522b\u65f6\u5019\uff0c\u9700\u8981\u5728<code>\u9694\u79bb\u7ea7\u522b<\/code>\u548c<code>\u6267\u884c\u6548\u7387<\/code>\u4e24\u8005\u505a\u5e73\u8861\u53d6\u820d\u3002<\/p><\/blockquote>\n<p>\u4e3a\u4e86\u4fbf\u4e8e\u7406\u89e3\uff0c\u4e0b\u9762\u5c31\u4e3e\u4e00\u4e2a\u4f8b\u5b50\uff1a<\/p>\n<p><img decoding=\"async\" referrerpolicy=\"no-referrer\" src=\"https:\/\/segmentfault.com\/img\/bVc1XCk\" alt=\"image.png\" title=\"image.png\" loading=\"lazy\"><\/p>\n<p>\u5728\u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c<code>\u4e8b\u52a1A<\/code>\u4f1a\u6709\u54ea\u4e9b\u4e0d\u540c\u7684\u8fd4\u56de\u7ed3\u679c\uff0c\u4e5f\u5c31\u662f\u56fe\u4e2d\u7684<code>V1<\/code>\u3001<code>V2<\/code>\u3001<code>V3<\/code>\u7684\u8fd4\u56de\u503c\u5206\u522b\u662f\u4ec0\u4e48\u3002<\/p>\n<ul>\n<li>\u5982\u679c\u9694\u79bb\u7ea7\u522b\u662f\u8bfb\u672a\u63d0\u4ea4\uff0c<code>\u4e8b\u52a1B<\/code>\u4fee\u6539\u540e\u6570\u636e\u65e0\u9700\u63d0\u4ea4\u4e8b\u52a1\uff0c\u5c31\u80fd\u88ab<code>\u4e8b\u52a1A<\/code>\u8bfb\u53d6\uff0c\u6240\u4ee5<code>V1<\/code>\u3001<code>V2<\/code>\u3001<code>V3<\/code>\u7684\u503c\u90fd\u662f<code>2<\/code>\u3002<\/li>\n<li>\u5982\u679c\u9694\u79bb\u7ea7\u522b\u662f\u8bfb\u5df2\u63d0\u4ea4\uff0c<code>\u4e8b\u52a1B<\/code>\u4fee\u6539\u540e\u9700\u8981\u63d0\u4ea4\u540e\uff0c\u4fee\u6539\u540e\u7684\u6570\u636e\u624d\u80fd\u88ab<code>\u4e8b\u52a1A<\/code>\u8bfb\u53d6\uff0c\u6240\u4ee5<code>V1<\/code>\u7684\u503c\u662f<code>1<\/code>\uff0c<code>\u4e8b\u52a1B<\/code>\u63d0\u4ea4\uff0c<code>\u4e8b\u52a1A<\/code>\u8bfb\u53d6\u4fee\u6539\u540e\u7684\u6570\u636e,\u6240\u4ee5<code>V2<\/code>\u7684\u503c\u662f<code>2<\/code>,<code>V3<\/code>\u7684\u503c\u4e5f\u662f<code>2<\/code>\u3002<\/li>\n<li>\u5982\u679c\u9694\u79bb\u7ea7\u522b\u662f\u53ef\u91cd\u590d\u8bfb\uff0c\u6574\u4e2a\u4e8b\u52a1\u770b\u5230\u7684\u4e8b\u52a1\u548c\u4e8b\u52a1\u5f00\u542f\u65f6\u770b\u5230\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\uff0c\u5f00\u542f\u770b\u5230\u7684\u6570\u636e\u662f<code>1<\/code>\uff0c\u6240\u4ee5<code>V1<\/code>\u3001<code>V2<\/code>\u7684\u503c\u90fd\u662f<code>1<\/code>,\u4e8b\u52a1A\u63d0\u4ea4\u4e4b\u540e\uff0c\u83b7\u53d6\u5230\u4fee\u6539\u540e\u7684\u6570\u636e\uff0c\u6240\u4ee5<code>V3<\/code>\u7684\u503c\u662f<code>2<\/code>\u3002<\/li>\n<li>\u5982\u679c\u9694\u79bb\u7ea7\u522b\u662f\u4e32\u884c\u5316\uff0c\u4f1a\u88ab\u9501\u4f4f\uff0c\u6b64\u65f6\u4e8b\u52a1B\u5bf9\u5e94\u7684\u7ebf\u7a0b\u5904\u4e8e\u963b\u585e\u72b6\u6001\uff0c\u76f4\u5230\u4e8b\u52a1A\u63d0\u4ea4\u4e4b\u540e\uff0c\u4e8b\u52a1B\u624d\u4f1a\u7ee7\u7eed<code>\u5c061\u6539\u62102<\/code>\u3002\u6240\u4ee5<code>V1<\/code>\u3001<code>V2<\/code>\u7684\u503c\u662f<code>1<\/code>\uff0c<code>V3<\/code>\u7684\u503c\u662f<code>2<\/code>\u3002<\/li>\n<\/ul>\n<blockquote><p><code>MySQL<\/code>\u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\u662f<code>\u53ef\u91cd\u590d\u8bfb<\/code>\u3002<\/p><\/blockquote>\n<h3>\u9694\u79bb\u7ea7\u95ee\u9898<\/h3>\n<p>\u5148\u4e86\u89e3\u51e0\u4e2a\u57fa\u672c\u6982\u5ff5\uff1a<\/p>\n<p><strong>\u810f\u8bfb<\/strong>\uff1a<code>\u4e8b\u52a1A<\/code>\u4fee\u6539\u6570\u636e\uff0c<code>\u4e8b\u52a1B<\/code>\u8bfb\u53d6\u4e86\u6570\u636e\u540e<code>\u4e8b\u52a1A<\/code>\u62a5\u9519\u56de\u6eda\uff0c\u4fee\u6539\u7684\u6570\u636e\u6ca1\u6709\u63d0\u4ea4\u5230\u6570\u636e\u5e93\u4e2d\uff0c\u6b64\u65f6<code>\u4e8b\u52a1B<\/code>\u8bfb\u53d6\u4fee\u6539\u7684\u6570\u636e\u5c31\u662f\u4e00\u4e2a<strong>\u810f\u8bfb<\/strong>\uff0c\u4e5f\u5c31\u662f\u4e00\u4e2a\u4e8b\u52a1\u8bfb\u53d6\u5230\u53e6\u4e00\u4e2a\u4e8b\u52a1\u672a\u63d0\u4ea4\u7684\u6570\u636e\u5c31\u662f<strong>\u810f\u8bfb<\/strong>\u3002<\/p>\n<p><strong>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/strong>\uff1a<code>\u4e8b\u52a1A<\/code>\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u4e0a\u591a\u6b21\u8bfb\u53d6\u540c\u4e00\u4e2a\u6570\u636e\uff0c\u5728<code>\u4e8b\u52a1A<\/code>\u8fd8\u6ca1\u6709\u7ed3\u675f\u65f6\uff0c<code>\u4e8b\u52a1B<\/code>\u4fee\u6539\u4e86\u8be5\u6570\u636e\uff0c\u7531\u4e8e<code>\u4e8b\u52a1B<\/code>\u7684\u4fee\u6539\uff0c\u5bfc\u81f4<code>\u4e8b\u52a1A<\/code>\u4e24\u6b21\u8bfb\u53d6\u7684\u6570\u636e\u4e0d\u4e00\u81f4\uff0c\u5c31\u51fa\u73b0\u4e86<strong>\u4e0d\u53ef\u4ee5\u91cd\u590d\u8bfb<\/strong>\u7684\u73b0\u8c61\u3002<\/p>\n<p><strong>\u5e7b\u8bfb<\/strong>\uff1a<code>\u4e8b\u52a1A<\/code>\u6839\u636e\u6761\u4ef6\u67e5\u8be2\u5f97\u5230<code>N<\/code>\u6761\u6570\u636e\uff0c\u4f46\u6b64\u65f6<code>\u4e8b\u52a1B<\/code>\u66f4\u6539\u6216\u8005\u589e\u52a0\u4e86<code>M<\/code>\u6761\u7b26\u5408<code>\u4e8b\u52a1A<\/code>\u67e5\u8be2\u7684\u6761\u4ef6\u7684\u6570\u636e\u3002\u8fd9\u6837\u5f53<code>\u4e8b\u52a1A<\/code>\u518d\u6b21\u67e5\u8be2\u7684\u65f6\u5019\u53d1\u73b0\u4f1a\u6709<code>N + M<\/code>\u6761\u6570\u636e\uff0c\u4ea7\u751f\u4e86\u5e7b\u8bfb\u3002 <\/p>\n<p>\u51e0\u79cd\u9694\u79bb\u7ea7\u522b\u53ef\u80fd\u4f1a\u6709<code>\u810f\u8bfb<\/code>\u3001<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u6216\u8005<code>\u5e7b\u8bfb<\/code>\u7684\u95ee\u9898\uff0c\u5b83\u4eec\u4e4b\u95f4\u7684\u5173\u7cfb\u5982\u4e0b\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th align=\"center\">\u9694\u79bb\u7ea7\u522b<\/th>\n<th align=\"center\">\u810f\u8bfb<\/th>\n<th align=\"center\">\u4e0d\u53ef\u91cd\u590d\u8bfb<\/th>\n<th align=\"center\">\u5e7b\u8bfb<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td align=\"center\"><code>\u8bfb\u672a\u63d0\u4ea4<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><code>\u8bfb\u63d0\u4ea4<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><code>\u53ef\u91cd\u590d\u8bfb<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<td align=\"center\"><code>\u221a<\/code><\/td>\n<\/tr>\n<tr>\n<td align=\"center\"><code>\u4e32\u884c\u5316<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<td align=\"center\"><code>\u00d7<\/code><\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<ul>\n<li><code>\u8bfb\u672a\u63d0\u4ea4<\/code>\uff1a\u53ef\u80fd\u4f1a\u51fa\u73b0<code>\u810f\u8bfb<\/code>\u3001<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3001<code>\u5e7b\u8bfb<\/code>\uff0c\u8bfb\u53d6\u672a\u63d0\u4ea4\u4e8b\u52a1\u7684\u6570\u636e\uff0c\u6570\u636e\u64a4\u56de\u4e86\uff0c\u5c31\u662f\u4e00\u79cd<code>\u810f\u8bfb<\/code>\u3002\u5982\u679c\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539\u540c\u4e00\u4e2a\u6570\u636e\uff0c\u4e8b\u52a1\u8bfb\u53d6\u7684\u6570\u636e\u4e5f\u662f\u4e0d\u540c\u7684\uff0c\u6240\u4ee5\u4e5f\u5b58\u5728<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3002\u540c\u65f6\u4e5f\u80fd\u8bfb\u53d6\u5230\u5176\u4ed6\u4e8b\u52a1\u6dfb\u52a0\u7684\u6570\u636e\uff0c\u6240\u4ee5\u4e5f\u5b58\u5728<code>\u5e7b\u8bfb<\/code>\u3002<\/li>\n<li><code>\u8bfb\u5df2\u63d0\u4ea4<\/code>\uff1a\u8be5\u9694\u79bb\u7ea7\u522b\u53ea\u80fd\u8bfb\u53d6\u5230\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u540e\u7684\u6570\u636e\uff0c\u6240\u4ee5<code>\u4e0d\u5b58\u5728\u810f\u8bfb<\/code>\u3002\u4f46\u662f\u5728\u7b2c\u4e00\u6b21\u8bfb\u53d6\u6570\u636e\u540e\uff0c\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539\u540e\u6570\u636e\u5e76\u63d0\u4ea4\u4e8b\u52a1\uff0c\u6b64\u65f6\u4e8b\u52a1\u8bfb\u53d6\u5230\u6570\u636e\u5c31\u548c\u7b2c\u4e00\u6b21\u8bfb\u5230\u7684\u6570\u636e\u4e0d\u4e00\u81f4\u4e86\uff0c\u4e5f\u5c31<code>\u5b58\u5728\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3002\u540c\u65f6\u5176\u4ed6\u4e8b\u52a1\u53ef\u4ee5\u6dfb\u52a0\u591a\u6761\u6570\u636e\uff0c\u4e5f<code>\u5b58\u5728\u5e7b\u8bfb<\/code>\u3002<\/li>\n<li><code>\u53ef\u91cd\u590d\u5ea6\u8bfb<\/code>\uff1a\u8868\u793a\u6574\u4e2a\u4e8b\u52a1\u770b\u5230\u7684\u4e8b\u52a1\u548c\u5f00\u542f\u540e\u7684\u4e8b\u52a1\u80fd\u770b\u5230\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\uff0c\u65e2\u7136\u6570\u636e\u662f\u4e00\u81f4\u7684\uff0c\u6240\u4ee5<code>\u4e0d\u5b58\u5728\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3002\u800c\u4e14\u4e0d\u4f1a\u8bfb\u53d6\u5176\u4ed6\u4e8b\u52a1\u4fee\u6539\u7684\u6570\u636e\uff0c\u4e5f\u5c31\u662f<code>\u4e0d\u5b58\u5728\u810f\u8bfb<\/code>\u3002\u800c\u5bf9<code>\u540c\u4e00\u4e2a\u6279<\/code>\u6570\u636e\uff0c\u53ef\u80fd\u4f1a\u5b58\u5728\u6dfb\u52a0\u7684\u60c5\u51b5\uff0c\u6240\u4ee5\u53ef\u80fd\u4f1a\u5b58\u5728\u5e7b\u8bfb\u7684\u60c5\u51b5\u3002<\/li>\n<li><code>\u7a9c\u884c\u5316<\/code>\uff1a\u5f53\u53d1\u751f\u8bfb\u5199\u9501\u51b2\u7a81\u65f6\uff0c\u540e\u9762\u7684\u4e8b\u52a1\u8981\u7b49\u524d\u9762\u7684\u4e8b\u52a1\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\u518d\u6267\u884c\uff0c\u6240\u4ee5\u4e00\u5b9a\u662f\u5148\u8bfb\u6216\u8005\u5148\u5199\u7684\u6267\u884c\u5b8c\u6bd5\u4e4b\u540e\u518d\u6267\u884c\u540e\u8bfb\u6216\u8005\u5199\uff0c\u8bfb\u5199\u6309\u7167\u987a\u5e8f\u4f9d\u6b21\u8fdb\u884c\uff0c\u6240\u4ee5<code>\u4e0d\u5b58\u5728\u810f\u8bfb<\/code>\u3001<code>\u4e0d\u5b58\u5728\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3001<code>\u4e5f\u4e0d\u5b58\u5728\u5e7b\u8bfb<\/code>\u3002<\/li>\n<\/ul>\n<h3>\u9694\u79bb\u7ea7\u522b\u539f\u7406<\/h3>\n<p>\u9694\u79bb\u7ea7\u522b\u7684\u4e3b\u8981\u662f\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236<code>MVCC<\/code>,<code>MVCC<\/code>\u662f\u901a\u8fc7\u4fdd\u5b58\u6570\u636e\u5728\u67d0\u4e2a\u65f6\u95f4\u70b9\u7684\u5feb\u7167\u6765\u5b9e\u73b0\u7684\u3002<\/p>\n<p><code>InnoDB<\/code>\u5b9e\u73b0\u7684<code>MVCC<\/code>\uff0c\u662f\u901a\u8fc7\u5728\u6bcf\u884c\u8bb0\u5f55\u540e\u9762\u4fdd\u5b58\u4e24\u4e2a\u9690\u85cf\u5217\u6765\u5b9e\u73b0\uff0c\u4e00\u4e2a\u662f\u4fdd\u5b58\u884c\u7684\u521b\u5efa\u65f6\u95f4\uff0c\u53e6\u4e00\u4e2a\u662f\u4fdd\u5b58\u884c\u7684\u8fc7\u671f\u65f6\u95f4\u3002\u5f53\u7136\u5b58\u50a8\u7684\u4e0d\u662f\u65f6\u95f4\uff0c\u800c\u662f<code>\u7cfb\u7edf\u7248\u672c\u53f7<\/code>\u3002\u6bcf\u5f00\u542f\u4e00\u4e2a\u65b0\u7684\u4e8b\u52a1\uff0c\u7cfb\u7edf\u7248\u672c\u53f7\u5148\u81ea\u52a8\u9012\u589e\uff0c\u8be5\u7cfb\u7edf\u7248\u672c\u53f7\u4f1a\u4f5c\u4e3a\u4e8b\u52a1\u7684\u7248\u672c\u53f7\uff0c\u7528\u6765\u548c\u67e5\u8be2\u5230\u7684\u6bcf\u884c\u8bb0\u5f55\u7684\u7248\u672c\u53f7\u505a\u6bd4\u8f83\u3002\u6bd4\u5982\u5728<code>\u53ef\u91cd\u590d\u8bfb<\/code>\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c<code>MVCC<\/code>\u662f\u5982\u4f55\u64cd\u4f5c\u7684\uff1a<\/p>\n<ul>\n<li>\n<p>SELECT<\/p>\n<ul>\n<li>\n<p><code>InnoDB<\/code>\u4f1a\u6839\u636e\u4ee5\u4e0b\u4e24\u4e2a\u6761\u4ef6\u68c0\u67e5\u6bcf\u884c\u8bb0\u5f55\uff1a<\/p>\n<ul>\n<li>\n<ol>\n<li><code>InnoDB<\/code>\u53ea\u67e5\u627e\u7248\u672c\u53f7\u65e9\u4e8e\u5f53\u524d\u4e8b\u52a1\u7684\u6570\u636e\u884c\uff08\u7cfb\u7edf\u7248\u672c\u53f7\u5c0f\u4e8e\u6216\u8005\u7b49\u4e8e\u4e8b\u52a1\u7684\u7cfb\u7edf\u7248\u672c\u53f7\uff09\uff0c\u8fd9\u6837\u53ef\u4ee5\u786e\u4fdd\u4e8b\u52a1\u8bfb\u53d6\u7684\u884c\uff0c\u8981\u4e48\u662f\u5728\u4e8b\u52a1\u5f00\u59cb\u524d\u5c31\u5b58\u5728\uff0c\u8981\u4e48\u662f\u4e8b\u52a1\u81ea\u8eab\u63d2\u5165\u6216\u8005\u66f4\u65b0\u8fc7\u3002<\/li>\n<\/ol>\n<\/li>\n<li>\n<ol start=\"2\">\n<li>\u884c\u7684\u5220\u9664\u7248\u672c\u8981\u4e48\u672a\u5b9a\u4e49\uff0c\u8981\u4e48\u5927\u4e8e\u5f53\u524d\u4e8b\u52a1\u7248\u672c\u53f7\u3002\u8fd9\u53ef\u4ee5\u786e\u4fdd\u4e8b\u52a1\u8bfb\u53d6\u5230\u7684\u884c\uff0c\u5728\u4e8b\u52a1\u5f00\u59cb\u4e4b\u524d\u672a\u88ab\u5220\u9664\u3002<\/li>\n<\/ol>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<ul>\n<li>\u53ea\u6709\u7b26\u5408\u4e0a\u8ff0\u4e24\u4e2a\u6761\u4ef6\u7684\u8bb0\u5f55\uff0c\u624d\u80fd\u8fd4\u56de\u4f5c\u4e3a\u67e5\u8be2\u7684\u7ed3\u679c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>INSERT<\/p>\n<ul>\n<li><code>InnoDB<\/code>\u4e3a\u65b0\u63d2\u5165\u7684\u6bcf\u4e00\u884c\u4fdd\u5b58\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u4f5c\u4e3a\u884c\u7248\u672c\u53f7\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>DELETE<\/p>\n<ul>\n<li><code>InnoDB<\/code>\u4e3a\u5220\u9664\u7684\u6bcf\u4e00\u884c\u4fdd\u5b58\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u4f5c\u4e3a\u884c\u5220\u9664\u7684\u6807\u8bc6\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p>UPDATE<\/p>\n<ul>\n<li><code>InnoDB<\/code>\u4e3a\u63d2\u5165\u4e00\u884c\u65b0\u8bb0\u5f55\uff0c\u4fdd\u5b58\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u4f5c\u4e3a\u884c\u7248\u672c\u53f7\uff0c\u540c\u65f6\u4fdd\u5b58\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u5230\u539f\u6765\u7684\u884c\u4f5c\u4e3a\u884c\u5220\u9664\u6807\u8bc6\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>\u4fdd\u5b58\u7740\u4e24\u4e2a\u989d\u5916\u7684\u7cfb\u7edf\u7248\u672c\u53f7\uff0c\u5927\u591a\u6570\u8bfb\u64cd\u4f5c\u90fd\u53ef\u4ee5<code>\u4e0d\u7528\u52a0\u9501<\/code>\u3002\u8fd9\u6837\u8bbe\u8ba1\u662f\u7684\u8bfb\u6570\u636e\u7684\u64cd\u4f5c\u5f88\u7b80\u5355\uff0c\u6027\u80fd\u5f88\u597d\uff0c\u5e76\u4e14\u4e5f\u80fd\u4fdd\u8bc1\u53ea\u4f1a\u8bfb\u53d6\u5230\u7b26\u5408\u6807\u51c6\u7684\u884c\u3002\u4e0d\u8db3\u4e4b\u5904\u662f\u6bcf\u884c\u8bb0\u5f55\u90fd\u9700\u8981\u989d\u5916\u7684\u5b58\u50a8\u7a7a\u95f4\uff0c\u9700\u8981\u505a\u66f4\u591a\u7684\u884c\u68c0\u67e5\u5de5\u4f5c\uff0c\u4ee5\u53ca\u4e00\u4e9b\u989d\u5916\u7684\u7ef4\u62a4\u5de5\u4f5c\u3002<\/p>\n<blockquote><p><code>MVCC<\/code>\u53ea\u5728<code>\u8bfb\u5df2\u63d0\u4ea4<\/code>\u548c<code>\u53ef\u91cd\u590d\u8bfb<\/code>\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u4e0b\u751f\u6548\u3002\u5176\u4ed6\u4e24\u4e2a\u9694\u79bb\u7ea7\u522b\u4e0bMVCC\u90fd\u4e0d\u80fd\u751f\u6548\uff0c\u56e0\u4e3a<code>\u8bfb\u672a\u63d0\u4ea4<\/code>\u603b\u662f\u8bfb\u53d6\u5230\u6700\u65b0\u7684\u6570\u636e\u884c\uff0c\u65e0\u9700\u8bb0\u5f55\u5f53\u524d\u4e8b\u52a1\u7248\u672c\u53f7\u3002\u800c<code>\u4e32\u884c\u5316<\/code>\u4f1a\u5bf9\u6240\u6709\u7684\u8bfb\u5199\u90fd\u4f1a\u8fdb\u884c\u52a0\u9501\uff0c<code>\u5148\u8bfb\u3001\u5148\u5199<\/code>\u7684\u5148\u6267\u884c\uff0c<code>\u540e\u8bfb<\/code>\u3001<code>\u540e\u5199<\/code>\u7684\u540e\u6267\u884c\u3002\u4e5f\u4e0d\u9700\u8981\u8bb0\u5f55\u8bb0\u5f55\u7248\u672c\u53f7\u7cbe\u5fc3\u6bd4\u5bf9\u3002<\/p><\/blockquote>\n<p><code>InnoDB<\/code>\u7684\u884c\u6570\u636e\u6709\u591a\u4e2a\u7248\u672c\uff0c\u6bcf\u4e2a\u6570\u636e\u7248\u672c\u90fd\u6709\u81ea\u5df1\u7684<code>row trx_id<\/code>\uff0c\u6bcf\u4e2a\u4e8b\u52a1\u6216\u8005\u8bed\u53e5\u90fd\u6709\u81ea\u5df1\u7684\u4e00\u81f4\u6027\u89c6\u56fe\u3002\u67e5\u8be2\u8bed\u53e5\u662f\u4e00\u81f4\u6027\u8bfb\uff0c\u4e00\u81f4\u6027\u8bfb\u4f1a\u6839\u636e<code>row trx_id<\/code>\u548c\u4e00\u81f4\u6027\u89c6\u56fe\u786e\u5b9a\u6570\u636e\u7248\u672c\u7684\u53ef\u89c1\u6027\u3002<\/p>\n<ul>\n<li>\u53ef\u91cd\u590d\u8bfb\uff0c\u53ea\u67e5\u8be2\u5728\u4e8b\u52a1\u542f\u52a8\u524d\u5c31\u63d0\u4ea4\u5b8c\u6210\u7684\u6570\u636e\u3002<\/li>\n<li>\u8bfb\u5df2\u63d0\u4ea4\uff0c\u53ea\u67e5\u8be2\u8bed\u53e5\u542f\u52a8\u524d\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n<h2>\u603b\u7ed3<\/h2>\n<ul>\n<li>\n<p>\u56db\u79cd\u9694\u79bb\u7ea7\u522b:<\/p>\n<ul>\n<li><code>\u8bfb\u672a\u63d0\u4ea4<\/code>\uff1a\u6570\u636e\u4f1a\u8bfb\u53d6\u5176\u4ed6\u4e8b\u52a1\u672a\u66f4\u65b0\u5230\u6570\u636e\u7684\u6570\u636e\u3002\u53ef\u80fd\u4f1a\u5b58\u5728<code>\u810f\u8bfb<\/code>\u3001<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3001<code>\u5e7b\u8bfb<\/code>\u7684\u95ee\u9898\u3002<\/li>\n<li><code>\u8bfb\u5df2\u63d0\u4ea4(read committed)<\/code>\uff1a\u6570\u636e\u53ea\u80fd\u8bfb\u53d6\u5176\u4ed6\u4e8b\u52a1\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u4e0d\u5b58\u5728<code>\u810f\u8bfb<\/code>\uff0c\u4f46\u662f\u53ef\u80fd\u4f1a\u5b58\u5728<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\u3001<code>\u5e7b\u8bfb<\/code>\u7684\u95ee\u9898\u3002<\/li>\n<li><code>\u53ef\u91cd\u590d\u8bfb(repeatable read)<\/code>:\u4e8b\u52a1\u6267\u884c\u8fc7\u7a0b\u4e2d\u770b\u5230\u7684\u6570\u636e\uff0c\u603b\u662f\u548c\u8fd9\u4e2a\u4e8b\u52a1\u5f00\u542f\u65f6\u770b\u5230\u7684\u6570\u636e\u662f\u4e00\u81f4\u7684\u3002\u5728\u53ef\u91cd\u590d\u8bfb\u7684\u9694\u79bb\u7ea7\u522b\u4e0b\uff0c\u672a\u63d0\u4ea4\u7684\u4e8b\u52a1\u5bf9\u5176\u4ed6\u4e8b\u52a1\u4e5f\u662f\u4e0d\u53ef\u89c1\u7684\u3002\u4e0d\u5b58\u5728<code>\u810f\u8bfb<\/code>\u3001<code>\u4e0d\u53ef\u91cd\u590d\u8bfb<\/code>\uff0c\u4f46\u662f\u53ef\u80fd\u4f1a\u5b58\u5728<code>\u5e7b\u8bfb<\/code>\u95ee\u9898\u3002<\/li>\n<li><code>\u4e32\u884c\u5316(serializable)<\/code>\uff1a\u5b58\u5728<code>\u8bfb\u5199\u9501<\/code>\u51b2\u7a81\u65f6\uff0c\u540e\u8bbf\u95ee\u7684\u4e8b\u52a1\u4f1a\u7b49\u524d\u4e00\u4e2a\u4e8b\u52a1\u6267\u884c\u5b8c\u6bd5\u540e\uff0c\u518d\u7ee7\u7eed\u6267\u884c\u3002<\/li>\n<\/ul>\n<\/li>\n<li>\n<p><code>MySQL<\/code>\u91c7\u7528\u4e86<code>MVVC<\/code>(\u591a\u7248\u672c\u5e76\u53d1\u63a7\u5236)\u89e3\u51b3<code>\u8bfb\u5df2\u63d0\u4ea4<\/code>\u3001<code>\u53ef\u91cd\u590d\u8bfb<\/code>\u9694\u79bb\u95ee\u9898\u3002<\/p>\n<ul>\n<li>\u6267\u884c\u4e00\u6761<code>SQL<\/code>\u8bed\u53e5\uff0c\u90fd\u4f1a\u4fdd\u5b58\u4e24\u4e2a\u9690\u85cf\u7684\u5217\u3002\u4e00\u4e2a\u662f\u4fdd\u5b58\u521b\u5efa\u65f6\u95f4\uff0c\u4e00\u4e2a\u4fdd\u5b58\u8fc7\u671f\u65f6\u95f4\uff0c\u50a8\u5b58\u7684<code>\u7cfb\u7edf\u7248\u672c\u53f7<\/code>\u3002<\/li>\n<li>\n<p>\u6bcf\u6b21\u5f00\u542f\u4e00\u4e2a\u4e8b\u52a1\u90fd\u4f1a\u7cfb\u7edf\u4f1a\u9012\u589e\u4e00\u4e2a<code>\u7cfb\u7edf\u7248\u672c\u53f7<\/code>,\u4f5c\u4e3a\u4e8b\u52a1\u7684\u7248\u672c\u53f7\u3002<\/p>\n<ul>\n<li><code>select<\/code>\uff0c\u67e5\u8be2\u65e9\u4e8e\u5f53\u524d\u4e8b\u52a1\u7684\u6570\u636e\u3002<\/li>\n<li><code>insert<\/code>\u6dfb\u52a0\u7248\u672c\u53f7\u3002<\/li>\n<li><code>delete<\/code>\u4e3a\u5220\u9664\u7684\u884c\u628a\u7248\u672c\u53f7\u4f5c\u4e3a\u5220\u9664\u6807\u8bc6\u3002<\/li>\n<li><code>update<\/code>\uff0c\u5148\u63d2\u5165\u4e00\u6761\u6570\u636e\uff0c\u4fdd\u5b58\u5f53\u524d\u7cfb\u7edf\u7248\u672c\u53f7\u3002\u540c\u65f6\u4fdd\u5b58\u539f\u6765\u7684\u884c\u4f5c\u4e3a\u884c\u5220\u9664\u6807\u5fd7\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2>\u53c2\u8003<\/h2>\n<p><a href=\"https:\/\/link.segmentfault.com\/?enc=PHVtPwcD5bZHZ3zBeuRlRw%3D%3D.rDe2wtu9B7iN1RPRcjUra59LVbQ97dCvNuHHcFsYAvqw3jB1FTFTb8xvMI2SAiHs\" rel=\"nofollow\">\u4e8b\u52a1\u5230\u5e95\u662f\u9694\u79bb\u7684\u8fd8\u662f\u4e0d\u9694\u79bb\u7684\uff1f<\/a><\/p>\n<p><a href=\"https:\/\/link.segmentfault.com\/?enc=7c%2BPcTLTgpknptEa6Ek1Yg%3D%3D.gQGkI7dsYonDUxYl3a%2B1%2BNI1FA9GUMqXMwaOCNX1H6vyBoH%2FYO3nI3sfXFBo7pzV\" rel=\"nofollow\">\u9ad8\u6027\u80fdMySQL<\/a><\/p>\n<p><a href=\"https:\/\/segmentfault.com\/a\/1190000042374161\">https:\/\/segmentfault.com\/a\/1190000042374161<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u4e2a\u4e8b\u52a1\u5177\u6709ACID\u7279\u6027\uff0c\u4e5f\u5c31\u662f\uff08Atomicity\u3001Consistency\u3001Isolation\u3001Durabi [&hellip;]<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[],"tags":[],"class_list":["post-10006313","post","type-post","status-publish","format-standard","hentry"],"jetpack_sharing_enabled":true,"jetpack_featured_media_url":"","_links":{"self":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006313","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=10006313"}],"version-history":[{"count":0,"href":"https:\/\/itmax.cn\/index.php?rest_route=\/wp\/v2\/posts\/10006313\/revisions"}],"wp:attachment":[{"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=10006313"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=10006313"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/itmax.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=10006313"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}