{"id":1739,"date":"2021-08-02T15:53:38","date_gmt":"2021-08-02T07:53:38","guid":{"rendered":"https:\/\/egonlin.com\/?p=1739"},"modified":"2022-02-07T17:21:38","modified_gmt":"2022-02-07T09:21:38","slug":"mysql%e5%b8%b8%e8%a7%81%e9%9d%a2%e8%af%95%e9%a2%98","status":"publish","type":"post","link":"https:\/\/egonlin.com\/?p=1739","title":{"rendered":"mysql\u5e38\u89c1\u9762\u8bd5\u9898"},"content":{"rendered":"<h2>\u4e00\u3001\u7b80\u8ff0MySQL\u7d22\u5f15\u53ca\u5176\u4f5c\u7528\uff1f<\/h2>\n<pre><code class=\"language-bash\">    \u662f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e2d\u4e00\u4e2a\u6392\u5e8f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6839\u636e\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u7d22\u5f15\u5206\u4e3aHash\u7d22\u5f15\u3001B+\u6811\u7d22\u5f15\u7b49\u3002\u5e38\u89c1\u7684InnoDB\u5b58\u50a8\u5f15\u64ce\u7684\u9ed8\u8ba4\u7d22\u5f15\u5b9e\u73b0\u4e3a\uff1aB+\u6811\u7d22\u5f15\u3002\u7d22\u5f15\u53ef\u4ee5\u534f\u52a9\u5feb\u901f\u67e5\u8be2\u3001\u66f4\u65b0\u6570\u636e\u5e93\u8868\u4e2d\u6570\u636e\u3002<\/code><\/pre>\n<h2>\u4e8c\u3001\u4ec0\u4e48\u662f\u4e8b\u52a1\uff1f<\/h2>\n<pre><code class=\"language-bash\">    \u4e8b\u52a1\u662f\u4e00\u7cfb\u5217\u7684\u64cd\u4f5c\uff0c\u9700\u8981\u8981\u7b26\u5408ACID\u7279\u6027\uff0c\u5373\uff1a\u4e8b\u52a1\u4e2d\u7684\u64cd\u4f5c\u8981\u4e48\u5168\u90e8\u6210\u529f\uff0c\u8981\u4e48\u5168\u90e8\u5931\u8d25\u3002<\/code><\/pre>\n<h2>\u4e09\u3001\u5982\u4f55\u4fdd\u8bc1\u6570\u636e\u7684\u5b8c\u6574\u6027?\uff08\u4e8b\u52a1\u7684\u7279\u70b9\uff09<\/h2>\n<p><strong>\u7279\u70b9\uff1a<\/strong><\/p>\n<pre><code class=\"language-bash\">Atomicity \u539f\u5b50\u6027\nConsistency \u4e00\u81f4\u6027\nIsolation \u9694\u79bb\u6027\nDurability \u8010\u4e45\u6027<\/code><\/pre>\n<h3>1\u3001\u539f\u5b50\u6027<\/h3>\n<pre><code class=\"language-bash\">\u539f\u5b50\u6027\uff1a\u6240\u6709\u8bed\u53e5\u4f5c\u4e3a\u4e00\u4e2a\u5355\u5143\u5168\u90e8\u6210\u529f\u6267\u884c\u6216\u5168\u90e8\u53d6\u6d88\u3002\u4e0d\u80fd\u51fa\u73b0\u4e2d\u95f4\u72b6\u6001\u3002\n\n    \u521d\u4e2d\u77e5\u8bc6\uff1a\u539f\u5b50\u662f\u7269\u8d28\u7684\u6784\u6210\u5355\u5143\u4e4b\u4e00\uff0c\u5177\u5907\u5316\u5b66\u4e0d\u53ef\u5206\u5272\u6027\n    \u5728\u4e00\u4e2a\u4e8b\u52a1\u5de5\u4f5c\u5355\u5143\u4e2d\uff0c\u6240\u6709\u6807\u51c6\u4e8b\u52a1\u8bed\u53e5\uff08DML\uff09\uff0c\u8981\u4e48\u5168\u6210\u529f\uff0c\u8981\u4e48\u5168\u56de\u6eda\u3002<\/code><\/pre>\n<h3>2\u3001\u4e00\u81f4\u6027<\/h3>\n<pre><code class=\"language-bash\">\u4e00\u81f4\u6027\uff1a\u5982\u679c\u6570\u636e\u5e93\u5728\u4e8b\u52a1\u5f00\u59cb\u65f6\u5904\u4e8e\u4e00\u81f4\u72b6\u6001\uff0c\u5219\u5728\u6267\u884c\u8be5\u4e8b\u52a1\u671f\u95f4\u5c06\u4fdd\u7559\u4e00\u81f4\u72b6\u6001\u3002\n\n    \u4e8b\u52a1\u53d1\u751f\u524d\u3001\u4e2d\u3001\u540e\u90fd\u5e94\u8be5\u4fdd\u8bc1\u6570\u636e\u59cb\u7ec8\u4e00\u81f4\u72b6\u6001\n    MySQL\u7684\u5404\u9879\u529f\u80fd\u7684\u8bbe\u7f6e\uff0c\u90fd\u662f\u6700\u7ec8\u8981\u4fdd\u8bc1\u4e00\u81f4\u6027\u3002\n\n   \u4f8b\u5982\uff1a\n        \u4e00\u4e2a\u8f6c\u8d26\u4e8b\u52a1\uff0c\u91cc\u9762\u6709\u4e24\u6761sql\u8bed\u53e5\uff0c\u4e00\u6761\u662f\u5f20\u4e09\u51cf\u5c11100\u5143\uff0c\u53e6\u4e00\u4e2a\u662f\u674e\u56db\u52a0100\u5143\n        \u8f6c\u8d26\u524d\uff1a\n            \u5f20\u4e09\uff1a500\u5143\n            \u674e\u56db\uff1a500\u5143\n            \u603b\u989d\uff1a1000\u5143\n\n        \u4e8b\u52a1\u6267\u884c\u5b8c\u6210\u540e\uff0c\u5373\u8f6c\u8d26\u540e\n            \u5f20\u4e09\uff1a400\u5143\n            \u674e\u56db\uff1a600\u5143\n            \u4e24\u4e2a\u4eba\u603b\u94b1\u6570\uff1a1000\u5143\n\n        ps\uff1a\u524d\u540e\u6570\u636e\u7c7b\u578b\u4e5f\u8981\u4fdd\u6301\u4e00\u81f4<\/code><\/pre>\n<h3>3\u3001\u9694\u79bb\u6027<\/h3>\n<pre><code class=\"language-bash\">\u9694\u79bb\u6027\uff1a\u4e8b\u52a1\u4e4b\u95f4\u4e0d\u76f8\u4e92\u5f71\u54cd\u3002\n    mysql\u652f\u6301\u591a\u4e8b\u52a1\u5e76\u53d1\u5de5\u4f5c\u7684\u7cfb\u7edf\u3002\n    a\u5de5\u4f5c\u7684\u65f6\u5019\u4e0d\u80fd\u6536\u5230\u5176\u4ed6\u4e8b\u7269\u7684\u5f71\u54cd<\/code><\/pre>\n<h3>4\u3001\u6301\u4e45\u6027<\/h3>\n<pre><code class=\"language-bash\">\u6301\u4e45\u6027\uff1a\u4e8b\u52a1\u6210\u529f\u5b8c\u6210\u540e\uff0c\u6240\u505a\u7684\u6240\u6709\u66f4\u6539\u90fd\u4f1a\u51c6\u786e\u5730\u8bb0\u5f55\u5728\u6570\u636e\u5e93\u4e2d\u3002\u6240\u505a\u7684\u66f4\u6539\u4e0d\u4f1a\u4e22\u5931\u3002\n\n\u5f53\u4e8b\u52a1\u63d0\u4ea4\uff08commit\u547d\u4ee4\u6267\u884c\u6210\u529f\u540e\uff0c\u6b64\u6b21\u4e8b\u52a1\u64cd\u4f5c\u7684\u6240\u6709\u6570\u636e\u201c\u843d\u76d8\u201d\uff09\uff0c\u90fd\u8981\u6c38\u4e45\u4fdd\u5b58\u4e0b\u53bb\u3002\u4e0d\u4f1a\u56e0\u4e3a\u6570\u636e\u5b9e\u4f8b\u53d1\u751f\u6545\u969c\u3002<\/code><\/pre>\n<h2>\u56db\u3001\u4e8b\u52a1\u7684\u9694\u79bb\u673a\u5236<\/h2>\n<h3>1\u3001\u672a\u63d0\u4ea4\u8bfb(Read Uncommitted)<\/h3>\n<pre><code class=\"language-bash\">    \u5141\u8bb8\u810f\u8bfb\uff0c\u5176\u4ed6\u4e8b\u52a1\u53ea\u8981\u4fee\u6539\u4e86\u6570\u636e\uff0c\u5373\u4f7f\u672a\u63d0\u4ea4\uff0c\u672c\u4e8b\u52a1\u4e5f\u80fd\u770b\u5230\u4fee\u6539\u540e\u7684\u6570\u636e\u503c\u3002\u4e5f\u5c31\u662f\u53ef\u80fd\u8bfb\u53d6\u5230\u5176\u4ed6\u4f1a\u8bdd\u4e2d\u672a\u63d0\u4ea4\u4e8b\u52a1\u4fee\u6539\u7684\u6570\u636e\u3002\n\n\u6709\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898\uff1a\n    \u810f\u9875\u8bfb\uff0c\u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u5e7b\u8bfb<\/code><\/pre>\n<h3>2\u3001\u63d0\u4ea4\u8bfb(Read Committed)<\/h3>\n<pre><code class=\"language-bash\">    \u53ea\u80fd\u8bfb\u53d6\u5230\u5df2\u7ecf\u63d0\u4ea4\u7684\u6570\u636e\u3002Oracle\u7b49\u591a\u6570\u6570\u636e\u5e93\u9ed8\u8ba4\u90fd\u662f\u8be5\u7ea7\u522b (\u4e0d\u91cd\u590d\u8bfb)\u3002\n\n\u6709\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898\uff1a\n    \u4e0d\u53ef\u91cd\u590d\u8bfb\uff0c\u5e7b\u8bfb<\/code><\/pre>\n<h3>3\u3001\u53ef\u91cd\u590d\u8bfb(Repeated Read)<\/h3>\n<pre><code class=\"language-bash\">    \u53ef\u91cd\u590d\u8bfb\u3002\u65e0\u8bba\u5176\u4ed6\u4e8b\u52a1\u662f\u5426\u4fee\u6539\u5e76\u63d0\u4ea4\u4e86\u6570\u636e\uff0c\u5728\u8fd9\u4e2a\u4e8b\u52a1\u4e2d\u770b\u5230\u7684\u6570\u636e\u503c\u59cb\u7ec8\u4e0d\u53d7\u5176\u4ed6\u4e8b\u52a1\u5f71\u54cd\u3002\n\n\u6709\u53ef\u80fd\u51fa\u73b0\u7684\u95ee\u9898\uff1a\n    \u5e7b\u8bfb\uff0c\u4f46\u662f\u53ef\u4ee5\u901a\u8fc7\u5176\u4ed6\u624b\u6bb5\u9632\u6b62\u5e7b\u8bfb\u51fa\u73b0\u3002<\/code><\/pre>\n<h3>4\u3001\u4e32\u884c\u8bfb(Serializable)<\/h3>\n<pre><code class=\"language-bash\">    \u5b8c\u5168\u4e32\u884c\u5316\u7684\u8bfb\uff0c\u6bcf\u6b21\u8bfb\u90fd\u9700\u8981\u83b7\u5f97\u8868\u7ea7\u5171\u4eab\u9501\uff0c\u8bfb\u5199\u76f8\u4e92\u90fd\u4f1a\u963b\u585e\u3002\n    \u4e32\u884c\u5316\u4e8b\u52a1\u3002\u4ee5\u4e0a\u95ee\u9898\u90fd\u80fd\u89c4\u907f\uff0c\u4f46\u662f\u4e0d\u5229\u4e8e\u4e8b\u52a1\u7684\u5e76\u53d1\u3002<\/code><\/pre>\n<h2>\u4e94\u3001\u7b80\u8ff0\u4e0d\u540c\u9694\u79bb\u57fa\u7840\u51fa\u73b0\u7684\u95ee\u9898<\/h2>\n<h3>1\u3001\u810f\u8bfb<\/h3>\n<pre><code class=\"language-bash\">1)\u8bfb\u5230\u522b\u4eba\u5728\u5185\u5b58\u4e2d\u672a\u63d0\u4ea4\u7684\u6570\u636e\u3002\uff08\u53eabegin\u672acommit\uff0c\u4f46\u662f\u5176\u4ed6\u7528\u6237\u770b\u5230\u4e86\uff09\n2)\u5185\u5b58\u7f13\u5b58\u539f\u56e0\uff0c\u76f4\u63a5\u8bfb\u810f\u9875\u6570\u636e<\/code><\/pre>\n<h3>2\u3001\u4e0d\u53ef\u91cd\u590d\u8bfb<\/h3>\n<p><\/p><div id=\"rml_readmorelogin_placeholder\" style=\"position:relative;\"><div id=\"rml_fade_content\" style=\"position: absolute;\r\ntop:-10em;\r\nwidth:100%;\r\nheight:10em;\r\nbackground: -webkit-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: -moz-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: -o-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\r\nbackground-image: -ms-linear-gradient(rgba(255, 255, 255, 0) 0%,#ffffff 100%);\"><\/div><div class=\"wpf-controller aru_rml_from_in_post\" style=\"background-color:#eeeeee;border:5px solid #cce6ff;\" id=\"ARU_ReadMoreLogin_ReadMoreLoginController\"><h2 id=\"Header\">\u67e5\u770b\u66f4\u591a<\/h2><div id=\"Message\"><p>\u8054\u7cfb\u7ba1\u7406\u5458\u5fae\u4fe1tutu19192010\uff0c\u6ce8\u518c\u8d26\u53f7<\/p>\n<\/div><div id=\"StatusBarHeader\"><\/div><form id=\"ARU_ReadMoreLogin_ReadMoreLoginController\"><input name=\"post_id\" value=\"1739\" type=\"hidden\"\/><input name=\"_init_callback\" value=\"InitLogin\" type=\"hidden\"\/><input name=\"post_id\" value=\"1739\" type=\"hidden\"\/><input name=\"rt_ype\" value=\"1\" type=\"hidden\"\/><input name=\"nonce\" value=\"9921353428\" type=\"hidden\"\/><input name=\"_wpnonce\" value=\"e6fdc5202a\" type=\"hidden\"\/><input name=\"_controller\" value=\"ARU_ReadMoreLogin\\ReadMoreLoginController\" type=\"hidden\"\/><input name=\"_proxy_controller\" value=\"ARU_ReadMoreLogin\\ReadMoreLoginController\" type=\"hidden\"\/><input name=\"_view\" value=\"ARU_ReadMoreLogin\\ReadMoreLoginView\" type=\"hidden\"\/><table class=\"wpf-table-placeholder\"><tbody class=\"wpf-table-placeholder\"><tr class=\"wpf-table-placeholder\"><td class=\"wpf-table-placeholder-input\" width=\"400px\"><table class=\"wpf-table-placeholder\"><tbody class=\"wpf-table-placeholder\"><tr class=\"wpf-table-placeholder\"><th class=\"wpf-table-placeholder-input\"><label class=\"wpf-label\">Username:<\/label><\/th><\/tr><tr class=\"wpf-table-placeholder\"><td class=\"wpf-table-placeholder-input\"><input class=\"regular-text text_input\" name=\"username\" value=\"\" type=\"text\"\/><\/td><\/tr><tr class=\"wpf-table-placeholder\"><th class=\"wpf-table-placeholder-input\"><label class=\"wpf-label\">Password:<\/label><\/th><\/tr><tr class=\"wpf-table-placeholder\"><td class=\"wpf-table-placeholder-input\"><input class=\"regular-text text_input\" name=\"password\" value=\"\" type=\"password\"\/><\/td><\/tr><\/tbody><\/table><p class=\"wpf-table-placeholder submit\"><button class=\"wp_plugin_framework_ajax_button\" type=\"button\" style=\"background-color:#4D90FE;;color:#ffffff;;border:1px solid #3079ed;\" name=\"_event\" value=\"ButtonLogin\">Log in<\/button><\/p><\/td><td class=\"wpf-table-placeholder-input\"><\/td><\/tr><\/tbody><\/table><\/form><div id=\"ButtonStartRegister\"><a href=\"https:\/\/egonlin.com\/wp-login.php?action=register\">Register<\/a><\/div><div id=\"Link1\"><a href=\"https:\/\/egonlin.com\/wp-login.php?action=lostpassword\">Forgotten username or password?<\/a><\/div><div id=\"StatusBarFooter\"><\/div><\/div><\/div><div id=aru_remaining_content><\/div>","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u7b80\u8ff0MySQL\u7d22\u5f15\u53ca\u5176\u4f5c\u7528\uff1f \u662f\u6570\u636e\u5e93\u7ba1\u7406\u7cfb\u7edf\u4e2d\u4e00\u4e2a\u6392\u5e8f\u7684\u6570\u636e\u7ed3\u6784\uff0c\u6839\u636e\u4e0d\u540c\u7684\u5b58\u50a8\u5f15\u64ce\u7d22\u5f15\u5206\u4e3aHash\u7d22\u5f15 [&hellip;]<\/p>\n","protected":false},"author":3,"featured_media":2529,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[213],"tags":[19,99,22,100,20,215],"_links":{"self":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/1739"}],"collection":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1739"}],"version-history":[{"count":0,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/posts\/1739\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=\/wp\/v2\/media\/2529"}],"wp:attachment":[{"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1739"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1739"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/egonlin.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1739"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}