{"id":4378,"date":"2024-10-16T09:25:20","date_gmt":"2024-10-16T01:25:20","guid":{"rendered":"https:\/\/www.talktop.cn\/?p=4378"},"modified":"2024-11-11T15:38:56","modified_gmt":"2024-11-11T07:38:56","slug":"%e6%8f%90%e5%8d%87mysql%e6%80%a7%e8%83%bd%e7%9a%84%e7%a7%98%e5%af%86%e6%ad%a6%e5%99%a8%ef%bc%9a%e7%b4%a2%e5%bc%95%e4%b8%8b%e6%8e%a8%e6%8a%80%e6%9c%af%e5%85%a8%e8%a7%a3%e6%9e%90","status":"publish","type":"post","link":"https:\/\/www.talktop.cn\/?p=4378","title":{"rendered":"\u63d0\u5347MySQL\u6027\u80fd\u7684\u79d8\u5bc6\u6b66\u5668\uff1a\u7d22\u5f15\u4e0b\u63a8\u6280\u672f\u5168\u89e3\u6790"},"content":{"rendered":"\n<p>MySQL\u7d22\u5f15\u4e0b\u63a8\uff08Index Condition Pushdown\uff0cICP\uff09\u662f\u4e00\u79cd\u4f18\u5316\u6280\u672f\uff0c\u65e8\u5728\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528\u590d\u5408\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\u3002\u901a\u8fc7\u5728\u7d22\u5f15\u67e5\u627e\u9636\u6bb5\u5c31\u8fdb\u884c\u6761\u4ef6\u8fc7\u6ee4\uff0c\u51cf\u5c11\u9700\u8981\u8bfb\u53d6\u7684\u6570\u636e\u884c\uff0c\u4ece\u800c\u964d\u4f4eI\/O\u5f00\u9500\u548c\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e00\u3001\u7d22\u5f15\u4e0b\u63a8\u57fa\u672c\u6982\u5ff5<\/h5>\n\n\n\n<p>\u5728\u8fdb\u884c\u67e5\u8be2\u65f6\uff0cMySQL\u901a\u5e38\u4f1a\u5148\u901a\u8fc7\u7d22\u5f15\u627e\u5230\u7b26\u5408\u6761\u4ef6\u7684\u884c\uff0c\u7136\u540e\u518d\u901a\u8fc7\u8fd9\u4e9b\u884c\u53bb\u6570\u636e\u8868\u4e2d\u8bfb\u53d6\u5b8c\u6574\u7684\u8bb0\u5f55\u3002\u7d22\u5f15\u4e0b\u63a8\u7684\u505a\u6cd5\u662f\u5c06\u67d0\u4e9b\u8fc7\u6ee4\u6761\u4ef6\u201c\u4e0b\u63a8\u201d\u5230\u7d22\u5f15\u67e5\u627e\u9636\u6bb5\uff0c\u4f7f\u5f97\u53ea\u6709\u7b26\u5408\u6761\u4ef6\u7684\u884c\u624d\u4f1a\u88ab\u8bfb\u53d6\uff0c\u4ece\u800c\u51cf\u5c11\u4e0d\u5fc5\u8981\u7684I\/O\u64cd\u4f5c\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">\u5b9e\u73b0\u539f\u7406<\/h6>\n\n\n\n<p>MySQL\u7d22\u5f15\u4e0b\u63a8\u7684\u5b9e\u73b0\u4f9d\u8d56\u4e8e\u4ee5\u4e0b\u51e0\u4e2a\u6b65\u9aa4\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>\u7d22\u5f15\u67e5\u627e<\/strong>\uff1a\u5728\u67e5\u627e\u65f6\uff0c\u4f7f\u7528\u7d22\u5f15\u786e\u5b9a\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u4f4d\u7f6e\u3002<\/li>\n\n\n\n<li><strong>\u6761\u4ef6\u4e0b\u63a8<\/strong>\uff1a\u5bf9\u4e8e\u7d22\u5f15\u4e2d\u627e\u5230\u7684\u6bcf\u4e00\u6761\u8bb0\u5f55\uff0cMySQL\u4f1a\u6839\u636e\u4e0b\u63a8\u7684\u6761\u4ef6\uff08\u5982WHERE\u5b50\u53e5\u4e2d\u7684\u6761\u4ef6\uff09\u8fdb\u884c\u8fc7\u6ee4\u3002<\/li>\n\n\n\n<li><strong>\u8fd4\u56de\u7ed3\u679c<\/strong>\uff1a\u53ea\u6709\u7b26\u5408\u4e0b\u63a8\u6761\u4ef6\u7684\u8bb0\u5f55\u4f1a\u88ab\u8fd4\u56de\uff0c\u907f\u514d\u4e86\u4e0d\u5fc5\u8981\u7684\u5168\u8868\u626b\u63cf\u3002<\/li>\n<\/ol>\n\n\n\n<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1024\" height=\"528\" src=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-50-1024x528.png\" alt=\"\" class=\"wp-image-4380\" srcset=\"https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-50-1024x528.png 1024w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-50-300x155.png 300w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-50-768x396.png 768w, https:\/\/www.talktop.cn\/wp-content\/uploads\/2024\/10\/image-50.png 1221w\" sizes=\"(max-width: 1024px) 100vw, 1024px\" \/><\/figure>\n\n\n\n<p>\u5177\u4f53\u6765\u8bf4\uff0c\u5f53\u6267\u884c\u5305\u542b\u591a\u4e2a\u6761\u4ef6\u7684\u67e5\u8be2\u65f6\uff0cMySQL\u4f1a\u5206\u6790\u6761\u4ef6\u5e76\u51b3\u5b9a\u54ea\u4e9b\u6761\u4ef6\u53ef\u4ee5\u5728\u7d22\u5f15\u5c42\u9762\u8fdb\u884c\u8fc7\u6ee4\u3002\u8fd9\u4f7f\u5f97\u7cfb\u7edf\u5728\u65e9\u671f\u5c31\u80fd\u6dd8\u6c70\u4e0d\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\uff0c\u4ece\u800c\u52a0\u901f\u67e5\u8be2\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e8c\u3001\u5982\u4f55\u5f00\u542fMySQL\u7d22\u5f15\u4e0b\u63a8<\/h5>\n\n\n\n<p>\u5728MySQL 5.6\u53ca\u4ee5\u4e0a\u7248\u672c\u4e2d\uff0c\u7d22\u5f15\u4e0b\u63a8\u9ed8\u8ba4\u662f\u542f\u7528\u7684\u3002\u5982\u679c\u9700\u8981\u786e\u8ba4\u6216\u624b\u52a8\u542f\u7528\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0bSQL\u547d\u4ee4\u67e5\u770b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-1dc64516e27ccb6d881ee55f5dca51c9\"><code>SHOW VARIABLES LIKE 'innodb_index_condition_pushdown';<\/code><\/pre>\n\n\n\n<p>\u82e5\u8fd4\u56de\u503c\u4e3a<code>ON<\/code>\uff0c\u8868\u793a\u5df2\u542f\u7528\uff1b\u82e5\u8fd4\u56de\u503c\u4e3a<code>OFF<\/code>\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u5f00\u542f\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-3722563482881a95c853afff640b98ab\"><code>SET GLOBAL innodb_index_condition_pushdown = ON;<\/code><\/pre>\n\n\n\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8fd9\u4e2a\u8bbe\u7f6e\u4f1a\u5f71\u54cd\u6574\u4e2a\u6570\u636e\u5e93\uff0c\u4e14\u53ef\u80fd\u9700\u8981\u76f8\u5e94\u7684\u6743\u9650\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u4e09\u3001MySQL\u7d22\u5f15\u4e0b\u63a8\u7684\u4f7f\u7528\u573a\u666f<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u9002\u5408\u590d\u5408\u7d22\u5f15\u7684\u67e5\u8be2<\/h6>\n\n\n\n<p>\u5f53\u67e5\u8be2\u6761\u4ef6\u6d89\u53ca\u591a\u4e2a\u5217\uff0c\u5e76\u4e14\u8fd9\u4e9b\u5217\u5df2\u7ecf\u88ab\u7ec4\u5408\u6210\u590d\u5408\u7d22\u5f15\u65f6\uff0c\u7d22\u5f15\u4e0b\u63a8\u80fd\u591f\u663e\u8457\u63d0\u9ad8\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u8003\u8651\u4ee5\u4e0b\u8868\u7ed3\u6784\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-94a7a77fd2193d4e72618dc660d9241f\"><code>CREATE TABLE users (\n    id INT PRIMARY KEY,\n    name VARCHAR(100),\n    age INT,\n    city VARCHAR(100),\n    INDEX idx_name_age (name, age)\n);<\/code><\/pre>\n\n\n\n<p>\u67e5\u8be2\u8bed\u53e5\u5982\u4e0b\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-2a6335fd388225a5536fccf2a5122378\"><code>SELECT * FROM users WHERE name = 'Alice' AND age &gt; 30;<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u4f8b\u5b50\u4e2d\uff0c<code>idx_name_age<\/code>\u7d22\u5f15\u53ef\u4ee5\u5e2e\u52a9\u5feb\u901f\u5b9a\u4f4d\u6240\u6709\u540d\u79f0\u4e3a\u201cAlice\u201d\u7684\u8bb0\u5f55\uff0c\u800c\u7d22\u5f15\u4e0b\u63a8\u4f1a\u8fdb\u4e00\u6b65\u7b5b\u9009\u51fa\u5e74\u9f84\u5927\u4e8e30\u7684\u8bb0\u5f55\uff0c\u4ece\u800c\u51cf\u5c11\u6570\u636e\u8bfb\u53d6\u91cf\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u6570\u636e\u91cf\u5927\u7684\u8868<\/h6>\n\n\n\n<p>\u5728\u6570\u636e\u91cf\u8f83\u5927\u7684\u8868\u4e2d\uff0c\u7d22\u5f15\u4e0b\u63a8\u5c24\u4e3a\u91cd\u8981\u3002\u5b83\u53ef\u4ee5\u663e\u8457\u51cf\u5c11I\/O\u64cd\u4f5c\u7684\u6b21\u6570\u3002\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4e00\u4e2a\u5305\u542b\u4e0a\u767e\u4e07\u884c\u7684\u7528\u6237\u8868\uff0c\u901a\u8fc7\u6761\u4ef6\u4e0b\u63a8\uff0cMySQL\u53ef\u4ee5\u907f\u514d\u4ece\u78c1\u76d8\u8bfb\u53d6\u5927\u91cf\u4e0d\u7b26\u5408\u6761\u4ef6\u7684\u6570\u636e\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u590d\u6742\u67e5\u8be2<\/h6>\n\n\n\n<p>\u5728\u4f7f\u7528JOIN\u6216\u5b50\u67e5\u8be2\u65f6\uff0c\u7d22\u5f15\u4e0b\u63a8\u4e5f\u80fd\u53d1\u6325\u4f5c\u7528\u3002\u4f8b\u5982\uff0c\u8003\u8651\u5982\u4e0b\u67e5\u8be2\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code has-white-color has-black-background-color has-text-color has-background has-link-color wp-elements-5c052cf182ef9bf1da47376879ca2bee\"><code>SELECT * FROM orders o\nJOIN users u ON o.user_id = u.id\nWHERE u.city = 'New York' AND o.amount &gt; 100;<\/code><\/pre>\n\n\n\n<p>\u5728\u8fd9\u4e2a\u573a\u666f\u4e2d\uff0c\u901a\u8fc7\u7d22\u5f15\u4e0b\u63a8\uff0c\u53ef\u4ee5\u5728\u7528\u6237\u8868\u4e2d\u5148\u8fdb\u884c\u57ce\u5e02\u7684\u8fc7\u6ee4\uff0c\u518d\u5bf9\u7b26\u5408\u6761\u4ef6\u7684\u8bb0\u5f55\u8fdb\u884c\u8ba2\u5355\u91d1\u989d\u7684\u8fc7\u6ee4\uff0c\u6781\u5927\u63d0\u9ad8\u4e86\u67e5\u8be2\u6548\u7387\u3002<\/p>\n\n\n\n<h5 class=\"wp-block-heading\">\u56db\u3001MySQL\u7d22\u5f15\u4e0b\u63a8\u6ce8\u610f\u4e8b\u9879<\/h5>\n\n\n\n<h6 class=\"wp-block-heading\">1. \u7d22\u5f15\u7c7b\u578b<\/h6>\n\n\n\n<p>\u7d22\u5f15\u4e0b\u63a8\u4e3b\u8981\u9002\u7528\u4e8eInnoDB\u5b58\u50a8\u5f15\u64ce\u7684B+\u6811\u7d22\u5f15\uff0c\u5bf9\u5176\u4ed6\u7c7b\u578b\u7684\u7d22\u5f15\uff08\u5982HASH\u7d22\u5f15\uff09\u652f\u6301\u8f83\u5f31\u3002\u56e0\u6b64\uff0c\u5728\u8bbe\u8ba1\u7d22\u5f15\u65f6\uff0c\u5e94\u8be5\u4f18\u5148\u8003\u8651\u4f7f\u7528B+\u6811\u7d22\u5f15\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">2. \u9002\u7528\u6761\u4ef6<\/h6>\n\n\n\n<p>\u7d22\u5f15\u4e0b\u63a8\u5e76\u4e0d\u9002\u7528\u4e8e\u6240\u6709\u67e5\u8be2\u3002\u5f53\u67e5\u8be2\u7684WHERE\u6761\u4ef6\u65e0\u6cd5\u5229\u7528\u5230\u7d22\u5f15\u65f6\uff0c\u5373\u4f7f\u5f00\u542f\u4e86\u7d22\u5f15\u4e0b\u63a8\uff0c\u6027\u80fd\u4e5f\u4e0d\u4f1a\u5f97\u5230\u663e\u8457\u63d0\u5347\u3002\u56e0\u6b64\uff0c\u5408\u7406\u8bbe\u8ba1\u67e5\u8be2\u6761\u4ef6\u4e0e\u7d22\u5f15\u662f\u5173\u952e\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">3. \u6570\u636e\u5206\u5e03<\/h6>\n\n\n\n<p>\u5982\u679c\u8868\u7684\u6570\u636e\u5206\u5e03\u4e0d\u5747\u5300\uff0c\u53ef\u80fd\u4f1a\u5bfc\u81f4\u7d22\u5f15\u4e0b\u63a8\u7684\u6548\u679c\u4e0d\u5982\u9884\u671f\u3002\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u9700\u8981\u8003\u8651\u4f7f\u7528\u66f4\u9002\u5408\u7684\u6570\u636e\u5206\u5e03\u6a21\u578b\u6216\u5176\u4ed6\u4f18\u5316\u7b56\u7565\u3002<\/p>\n\n\n\n<h6 class=\"wp-block-heading\">4. \u67e5\u8be2\u4f18\u5316<\/h6>\n\n\n\n<p>\u5728\u590d\u6742\u67e5\u8be2\u4e2d\uff0c\u5efa\u8bae\u4f7f\u7528EXPLAIN\u547d\u4ee4\u5206\u6790\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u4ee5\u786e\u5b9a\u7d22\u5f15\u4e0b\u63a8\u662f\u5426\u88ab\u6709\u6548\u5229\u7528\u3002\u5982\u679c\u672a\u88ab\u5229\u7528\uff0c\u53ef\u4ee5\u8003\u8651\u4f18\u5316\u67e5\u8be2\u6761\u4ef6\u6216\u4fee\u6539\u7d22\u5f15\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>MySQL\u7d22\u5f15\u4e0b\u63a8\uff08Index Condition 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