{"id":457,"date":"2024-12-22T13:55:13","date_gmt":"2024-12-22T05:55:13","guid":{"rendered":"https:\/\/www.laixuexila.com\/?p=457"},"modified":"2024-12-22T13:55:13","modified_gmt":"2024-12-22T05:55:13","slug":"mysql%e7%b4%a2%e5%bc%95%e6%98%af%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e7%9a%84%ef%bc%9f","status":"publish","type":"post","link":"https:\/\/www.laixuexila.com\/index.php\/2024\/12\/22\/mysql%e7%b4%a2%e5%bc%95%e6%98%af%e5%a6%82%e4%bd%95%e5%ae%9e%e7%8e%b0%e7%9a%84%ef%bc%9f\/","title":{"rendered":"MySql\u7d22\u5f15\u662f\u5982\u4f55\u5b9e\u73b0\u7684\uff1f"},"content":{"rendered":"\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p class=\"wp-block-paragraph\">\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u4e3a\u4e86\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u800c\u8bbe\u8ba1\u7684\u6570\u636e\u7ed3\u6784\u3002\u5b83\u53ef\u4ee5\u8ba9\u6570\u636e\u5e93\u5f15\u64ce\u66f4\u5feb\u901f\u5730\u67e5\u627e\u548c\u8bbf\u95ee\u6570\u636e\u3002\u4e86\u89e3\u7d22\u5f15\u7684\u5b9e\u73b0\u539f\u7406\u3001\u79cd\u7c7b\u548c\u4f7f\u7528\u65b9\u5f0f\u5bf9\u4e8e\u6570\u636e\u5e93\u7684\u4f18\u5316\u548c\u9762\u8bd5\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u4ee5\u4e0b\u662f\u5173\u4e8e MySQL \u7d22\u5f15\u7684\u8be6\u7ec6\u8bb2\u89e3\u4ee5\u53ca\u5728\u9762\u8bd5\u4e2d\u7684\u56de\u7b54\u8981\u70b9\u3002<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\">1. <strong>MySQL \u7d22\u5f15\u7684\u5b9e\u73b0\u539f\u7406<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">MySQL \u7d22\u5f15\u901a\u5e38\u662f\u901a\u8fc7\u6570\u636e\u7ed3\u6784\u6765\u5b9e\u73b0\u7684\uff0c\u5e38\u89c1\u7684\u5b9e\u73b0\u65b9\u5f0f\u662f <strong>B+ \u6811<\/strong>\uff0c\u4f46\u4e5f\u6709\u4e00\u4e9b\u5176\u4ed6\u7684\u7d22\u5f15\u5b9e\u73b0\u65b9\u5f0f\uff0c\u6bd4\u5982 <strong>\u54c8\u5e0c\u7d22\u5f15<\/strong>\u3001<strong>\u5168\u6587\u7d22\u5f15<\/strong> \u548c <strong>\u7a7a\u95f4\u7d22\u5f15<\/strong>\u3002\u4e0b\u9762\u6211\u4eec\u8be6\u7ec6\u8bb2\u89e3\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">1.1 <strong>B+ \u6811\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>B+ \u6811<\/strong> \u662f MySQL \u9ed8\u8ba4\u4f7f\u7528\u7684\u7d22\u5f15\u6570\u636e\u7ed3\u6784\uff0c\u5e7f\u6cdb\u7528\u4e8e <strong>\u805a\u96c6\u7d22\u5f15<\/strong>\uff08Clustered Index\uff09\u548c <strong>\u975e\u805a\u96c6\u7d22\u5f15<\/strong>\uff08Non-Clustered Index\uff09\u4e2d\u3002<\/li>\n\n\n\n<li><strong>B+ \u6811<\/strong> \u662f\u4e00\u79cd\u81ea\u5e73\u8861\u7684\u6811\u6570\u636e\u7ed3\u6784\uff0c\u9002\u5408\u7528\u6765\u8fdb\u884c\u8303\u56f4\u67e5\u627e\u548c\u6392\u5e8f\u64cd\u4f5c\u3002\u5b83\u662f\u4e00\u68f5\u591a\u8def\u5e73\u8861\u67e5\u627e\u6811\uff0c\u6bcf\u4e2a\u8282\u70b9\u90fd\u5305\u542b\u4e00\u4e2a <strong>\u952e\u503c<\/strong> \u548c\u4e00\u4e2a <strong>\u6307\u5411\u5b50\u8282\u70b9\u7684\u6307\u9488<\/strong>\uff0c\u53f6\u5b50\u8282\u70b9\u5b58\u50a8\u4e86\u5b9e\u9645\u7684\u6570\u636e\u884c\u6307\u9488\uff08\u5bf9\u4e8e\u805a\u96c6\u7d22\u5f15\u6765\u8bf4\uff0c\u662f\u6570\u636e\u884c\u7684\u7269\u7406\u4f4d\u7f6e\uff09\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u5de5\u4f5c\u539f\u7406\uff1a<\/h5>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u67e5\u627e<\/strong>\uff1aB+ \u6811\u901a\u8fc7\u4e0d\u65ad\u6bd4\u8f83\u952e\u503c\u6765\u51b3\u5b9a\u67e5\u627e\u8def\u5f84\uff0c\u4ece\u6839\u8282\u70b9\u5f00\u59cb\uff0c\u9010\u6b65\u5411\u4e0b\u641c\u7d22\u3002\u6bcf\u4e00\u6b21\u67e5\u627e\u90fd\u6bd4\u4e0a\u4e00\u5c42\u8282\u70b9\u51cf\u5c11\u4e00\u4e2a\u7ea7\u522b\uff0c\u56e0\u6b64\u53ef\u4ee5\u975e\u5e38\u9ad8\u6548\u5730\u67e5\u627e\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u63d2\u5165\u548c\u5220\u9664<\/strong>\uff1a\u5728 B+ \u6811\u4e2d\uff0c\u63d2\u5165\u548c\u5220\u9664\u64cd\u4f5c\u4f1a\u5bfc\u81f4\u6811\u7684\u5e73\u8861\u6027\u53d1\u751f\u53d8\u5316\uff0c\u9700\u8981\u901a\u8fc7\u65cb\u8f6c\u548c\u5206\u88c2\u6765\u6062\u590d\u5e73\u8861\u3002<\/li>\n<\/ul>\n\n\n\n<h5 class=\"wp-block-heading\">\u793a\u4f8b\uff1a<\/h5>\n\n\n\n<p class=\"wp-block-paragraph\">\u5047\u8bbe\u6211\u4eec\u6709\u4e00\u4e2a <code>users<\/code> \u8868\uff0c<code>id<\/code> \u5b57\u6bb5\u4e0a\u6709\u4e00\u4e2a\u7d22\u5f15\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE INDEX idx_id ON users(id);<\/code><\/pre>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5728\u8fd9\u4e2a\u7d22\u5f15\u4e2d\uff0c<code>id<\/code> \u4f1a\u6309\u7167 <strong>\u5347\u5e8f<\/strong> \u6216 <strong>\u964d\u5e8f<\/strong> \u6392\u5217\u3002<\/li>\n\n\n\n<li>\u5f53\u67e5\u8be2 <code>SELECT * FROM users WHERE id = 100;<\/code> \u65f6\uff0cMySQL \u4f1a\u901a\u8fc7 B+ \u6811\u6765\u67e5\u627e\u5bf9\u5e94\u7684\u6570\u636e\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">1.2 <strong>\u54c8\u5e0c\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<p class=\"wp-block-paragraph\">\u54c8\u5e0c\u7d22\u5f15\u4e3b\u8981\u7528\u4e8e <strong>\u5185\u5b58\u5b58\u50a8\u5f15\u64ce\uff08Memory\uff09<\/strong> \u548c\u67d0\u4e9b\u7279\u6b8a\u7684\u5b58\u50a8\u5f15\u64ce\uff0c\u6bd4\u5982 <code>MEMORY<\/code> \u8868\u7c7b\u578b\u3002<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u54c8\u5e0c\u7d22\u5f15<\/strong>\uff1a\u901a\u8fc7\u54c8\u5e0c\u8868\u6765\u67e5\u627e\u6570\u636e\uff0c\u5f53\u67e5\u8be2\u65f6\uff0c\u6570\u636e\u5e93\u4f7f\u7528\u54c8\u5e0c\u51fd\u6570\u5bf9\u67e5\u8be2\u6761\u4ef6\u8fdb\u884c\u8ba1\u7b97\uff0c\u5f97\u5230\u4e00\u4e2a\u552f\u4e00\u7684\u54c8\u5e0c\u503c\uff0c\u518d\u901a\u8fc7\u54c8\u5e0c\u503c\u76f4\u63a5\u5b9a\u4f4d\u5230\u6570\u636e\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u70b9<\/strong>\uff1a\u54c8\u5e0c\u7d22\u5f15\u67e5\u627e\u901f\u5ea6\u5feb\uff0c\u9002\u7528\u4e8e <strong>\u7b49\u503c\u67e5\u8be2<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u7f3a\u70b9<\/strong>\uff1a\u4e0d\u652f\u6301\u8303\u56f4\u67e5\u8be2\u548c\u6392\u5e8f\uff0c\u4e14\u4e0d\u80fd\u5904\u7406\u91cd\u590d\u952e\u503c\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">1.3 <strong>\u5168\u6587\u7d22\u5f15\uff08Full-Text Index\uff09<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5168\u6587\u7d22\u5f15<\/strong> \u4e3b\u8981\u7528\u4e8e <strong>\u6587\u672c\u7c7b\u578b\u7684\u5b57\u6bb5<\/strong>\uff08\u5982 <code>TEXT<\/code>\u3001<code>VARCHAR<\/code>\uff09\uff0c\u53ef\u4ee5\u9ad8\u6548\u5730\u6267\u884c <strong>\u5168\u6587\u641c\u7d22<\/strong>\u3002<\/li>\n\n\n\n<li><strong>\u5de5\u4f5c\u539f\u7406<\/strong>\uff1a\u5168\u6587\u7d22\u5f15\u901a\u8fc7\u5012\u6392\u7d22\u5f15\uff08Inverted Index\uff09\u5b9e\u73b0\uff0c\u5148\u5c06\u6bcf\u4e2a\u8bcd\u5206\u8bcd\u5e76\u5efa\u7acb\u8bcd\u5178\uff0c\u7136\u540e\u5b58\u50a8\u8bcd\u4e0e\u6587\u6863\u7684\u5bf9\u5e94\u5173\u7cfb\u3002\u67e5\u8be2\u65f6\uff0c\u6839\u636e\u67e5\u8be2\u8bcd\u5728\u5012\u6392\u7d22\u5f15\u4e2d\u67e5\u627e\u76f8\u5173\u8bb0\u5f55\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">1.4 <strong>\u7a7a\u95f4\u7d22\u5f15<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7a7a\u95f4\u7d22\u5f15<\/strong> \u4e3b\u8981\u7528\u4e8e\u5b58\u50a8 <strong>\u7a7a\u95f4\u6570\u636e<\/strong>\uff08\u5982 GIS \u6570\u636e\uff09\uff0c\u5982\u5750\u6807\u70b9\u3001\u8def\u5f84\u3001\u591a\u8fb9\u5f62\u7b49\uff0c\u901a\u5e38\u4f7f\u7528 <strong>R-tree<\/strong> \u6216 <strong>Quad-tree<\/strong> \u6570\u636e\u7ed3\u6784\u3002<\/li>\n\n\n\n<li>\u8fd9\u79cd\u7d22\u5f15\u5728 MySQL \u4e2d\u4e3b\u8981\u5e94\u7528\u4e8e <strong>\u7a7a\u95f4\u7c7b\u578b<\/strong>\uff08\u5982 <code>POINT<\/code>\u3001<code>LINESTRING<\/code>\u3001<code>POLYGON<\/code>\uff09\u7684\u5b57\u6bb5\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">2. <strong>\u7d22\u5f15\u7684\u79cd\u7c7b<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5728 MySQL \u4e2d\uff0c\u5e38\u89c1\u7684\u7d22\u5f15\u7c7b\u578b\u6709\u4ee5\u4e0b\u51e0\u79cd\uff1a<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4e3b\u952e\u7d22\u5f15\uff08Primary Key Index\uff09<\/strong>\uff1a<\/li>\n\n\n\n<li>\u4e3b\u952e\u7d22\u5f15\u662f <strong>\u552f\u4e00\u7d22\u5f15<\/strong> \u7684\u4e00\u79cd\uff0c\u4e14\u4e3b\u952e\u5b57\u6bb5\u4e0d\u80fd\u4e3a NULL\u3002<\/li>\n\n\n\n<li>MySQL \u9ed8\u8ba4\u4f1a\u521b\u5efa\u4e00\u4e2a <strong>\u805a\u96c6\u7d22\u5f15\uff08Clustered Index\uff09<\/strong>\uff0c\u6570\u636e\u8868\u7684\u8bb0\u5f55\u4f1a\u6309\u7167\u4e3b\u952e\u7684\u987a\u5e8f\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\u3002<\/li>\n\n\n\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/strong>\uff1a<\/li>\n\n\n\n<li>\u552f\u4e00\u7d22\u5f15\u786e\u4fdd\u5217\u4e2d\u7684\u6bcf\u4e2a\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u53ef\u4ee5\u4e3a\u7a7a\u503c\u3002<\/li>\n\n\n\n<li>\u552f\u4e00\u7d22\u5f15\u4e0d\u662f\u805a\u96c6\u7d22\u5f15\uff0c\u6570\u636e\u5b58\u50a8\u987a\u5e8f\u4e0d\u4f9d\u8d56\u4e8e\u552f\u4e00\u7d22\u5f15\u3002<\/li>\n\n\n\n<li><strong>\u666e\u901a\u7d22\u5f15\uff08Normal Index\uff09<\/strong>\uff1a<\/li>\n\n\n\n<li>\u666e\u901a\u7d22\u5f15\u6ca1\u6709\u4efb\u4f55\u9650\u5236\uff0c\u4e0d\u4fdd\u8bc1\u552f\u4e00\u6027\uff0c\u4e3b\u8981\u7528\u4e8e\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002<\/li>\n\n\n\n<li><strong>\u5168\u5c40\u7d22\u5f15\uff08Full-Text Index\uff09<\/strong>\uff1a<\/li>\n\n\n\n<li>\u7528\u4e8e\u5168\u6587\u641c\u7d22\uff0c\u4e3b\u8981\u7528\u4e8e\u6587\u672c\u7c7b\u578b\u7684\u6570\u636e\uff08\u5982 <code>TEXT<\/code>\u3001<code>VARCHAR<\/code> \u7c7b\u578b\u5b57\u6bb5\uff09\u3002<\/li>\n\n\n\n<li><strong>\u8054\u5408\u7d22\u5f15\uff08Composite Index\uff09<\/strong>\uff1a<\/li>\n\n\n\n<li>\u8054\u5408\u7d22\u5f15\u662f\u57fa\u4e8e\u591a\u4e2a\u5217\u521b\u5efa\u7684\u7d22\u5f15\u3002MySQL \u4f1a\u6839\u636e\u7d22\u5f15\u4e2d\u5217\u7684\u987a\u5e8f\u6765\u4f18\u5316\u67e5\u8be2\u3002\u5982\u679c\u67e5\u8be2\u7684\u6761\u4ef6\u5339\u914d\u8054\u5408\u7d22\u5f15\u7684\u524d\u7f00\u5217\uff0c\u7d22\u5f15\u5c06\u88ab\u7528\u6765\u4f18\u5316\u67e5\u8be2\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">3. <strong>\u7d22\u5f15\u7684\u4f18\u7f3a\u70b9<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">3.1 <strong>\u4f18\u70b9<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u63d0\u9ad8\u67e5\u8be2\u6548\u7387<\/strong>\uff1a\u901a\u8fc7\u7d22\u5f15\uff0c\u67e5\u8be2\u6570\u636e\u5e93\u7684\u901f\u5ea6\u5927\u5927\u63d0\u5347\uff0c\u5c24\u5176\u662f\u5728\u5927\u6570\u636e\u91cf\u7684\u60c5\u51b5\u4e0b\u3002\u5bf9\u4e8e\u7ecf\u5e38\u7528\u4e8e\u67e5\u8be2\u6761\u4ef6\uff08<code>WHERE<\/code>\uff09\u3001\u6392\u5e8f\uff08<code>ORDER BY<\/code>\uff09\u3001\u5206\u7ec4\uff08<code>GROUP BY<\/code>\uff09\u7684\u5217\uff0c\u4f7f\u7528\u7d22\u5f15\u80fd\u591f\u663e\u8457\u63d0\u9ad8\u6548\u7387\u3002<\/li>\n\n\n\n<li><strong>\u52a0\u901f\u6392\u5e8f\u548c\u5206\u7ec4\u64cd\u4f5c<\/strong>\uff1a\u4f7f\u7528\u7d22\u5f15\u53ef\u4ee5\u63d0\u9ad8\u6570\u636e\u7684\u6392\u5e8f\u548c\u5206\u7ec4\u6548\u7387\uff0c\u7279\u522b\u662f <code>ORDER BY<\/code> \u548c <code>GROUP BY<\/code> \u64cd\u4f5c\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">3.2 <strong>\u7f3a\u70b9<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u589e\u52a0\u5199\u5165\u64cd\u4f5c\u7684\u6210\u672c<\/strong>\uff1a\u6bcf\u5f53\u5bf9\u8868\u8fdb\u884c <code>INSERT<\/code>\u3001<code>UPDATE<\/code> \u6216 <code>DELETE<\/code> \u64cd\u4f5c\u65f6\uff0c\u76f8\u5173\u7d22\u5f15\u4e5f\u9700\u8981\u66f4\u65b0\uff0c\u56e0\u6b64\u4f1a\u5e26\u6765\u989d\u5916\u7684\u6027\u80fd\u5f00\u9500\u3002<\/li>\n\n\n\n<li><strong>\u5360\u7528\u989d\u5916\u5b58\u50a8\u7a7a\u95f4<\/strong>\uff1a\u7d22\u5f15\u9700\u8981\u5b58\u50a8\u5728\u786c\u76d8\u4e0a\uff0c\u56e0\u6b64\u4f1a\u5360\u7528\u989d\u5916\u7684\u7a7a\u95f4\uff0c\u5c24\u5176\u662f\u5728\u521b\u5efa\u591a\u4e2a\u7d22\u5f15\u7684\u60c5\u51b5\u4e0b\uff0c\u5b58\u50a8\u7a7a\u95f4\u7684\u5f00\u9500\u53ef\u80fd\u975e\u5e38\u5927\u3002<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\">4. <strong>\u9762\u8bd5\u4e2d\u7684\u5e38\u89c1\u95ee\u9898\u53ca\u56de\u7b54\u8981\u70b9<\/strong><\/h3>\n\n\n\n<h4 class=\"wp-block-heading\">4.1 <strong>\u4ec0\u4e48\u662f\u7d22\u5f15\uff1f\u4e3a\u4ec0\u4e48\u8981\u4f7f\u7528\u7d22\u5f15\uff1f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56de\u7b54\u8981\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u7d22\u5f15\u662f\u4e00\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u7528\u4e8e\u52a0\u901f\u6570\u636e\u67e5\u8be2\u3002<\/li>\n\n\n\n<li>\u901a\u8fc7\u7d22\u5f15\uff0c\u6570\u636e\u5e93\u80fd\u591f\u66f4\u9ad8\u6548\u5730\u5b9a\u4f4d\u5230\u6240\u9700\u7684\u6570\u636e\u884c\uff0c\u800c\u4e0d\u9700\u8981\u5168\u8868\u626b\u63cf\uff0c\u4ece\u800c\u5927\u5927\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4.2 <strong>MySQL \u4e2d\u6709\u54ea\u4e9b\u7c7b\u578b\u7684\u7d22\u5f15\uff1f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56de\u7b54\u8981\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>MySQL \u4e2d\u7684\u5e38\u89c1\u7d22\u5f15\u7c7b\u578b\u6709\uff1a\u4e3b\u952e\u7d22\u5f15\uff08<code>PRIMARY KEY<\/code>\uff09\u3001\u552f\u4e00\u7d22\u5f15\uff08<code>UNIQUE<\/code>\uff09\u3001\u666e\u901a\u7d22\u5f15\uff08<code>INDEX<\/code>\uff09\u3001\u5168\u6587\u7d22\u5f15\uff08<code>FULLTEXT<\/code>\uff09\u548c\u8054\u5408\u7d22\u5f15\uff08<code>COMPOSITE<\/code>\uff09\u3002<\/li>\n\n\n\n<li>\u4e3b\u952e\u7d22\u5f15\u662f\u805a\u96c6\u7d22\u5f15\uff0c\u5176\u4ed6\u7d22\u5f15\u901a\u5e38\u662f\u975e\u805a\u96c6\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4.3 <strong>\u4ec0\u4e48\u662f\u805a\u96c6\u7d22\u5f15\u548c\u975e\u805a\u96c6\u7d22\u5f15\uff1f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56de\u7b54\u8981\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u805a\u96c6\u7d22\u5f15\uff08Clustered Index\uff09\uff1a\u6570\u636e\u884c\u7684\u5b58\u50a8\u987a\u5e8f\u4e0e\u7d22\u5f15\u987a\u5e8f\u76f8\u540c\uff0c\u8868\u53ea\u80fd\u6709\u4e00\u4e2a\u805a\u96c6\u7d22\u5f15\uff0c\u901a\u5e38\u662f\u4e3b\u952e\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u975e\u805a\u96c6\u7d22\u5f15\uff08Non-Clustered Index\uff09\uff1a\u7d22\u5f15\u548c\u6570\u636e\u5b58\u50a8\u987a\u5e8f\u4e0d\u76f8\u540c\uff0c\u6570\u636e\u548c\u7d22\u5f15\u5b58\u50a8\u5728\u4e0d\u540c\u7684\u4f4d\u7f6e\u3002\u4e00\u4e2a\u8868\u53ef\u4ee5\u6709\u591a\u4e2a\u975e\u805a\u96c6\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4.4 <strong>\u5982\u4f55\u4f18\u5316 MySQL \u67e5\u8be2\u4e2d\u7684\u7d22\u5f15\uff1f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56de\u7b54\u8981\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u9009\u62e9\u6027\u9ad8\u7684\u5217\u5e94\u4f18\u5148\u521b\u5efa\u7d22\u5f15\uff08\u5373\u67e5\u8be2\u65f6\u6761\u4ef6\u8f83\u5e38\u51fa\u73b0\u7684\u5217\uff09\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <strong>\u8986\u76d6\u7d22\u5f15\uff08Covering Index\uff09<\/strong>\uff0c\u786e\u4fdd\u67e5\u8be2\u7684\u5b57\u6bb5\u5728\u7d22\u5f15\u4e2d\u90fd\u80fd\u627e\u5230\uff0c\u4ece\u800c\u907f\u514d\u8bbf\u95ee\u8868\u4e2d\u7684\u6570\u636e\u884c\u3002<\/li>\n\n\n\n<li>\u5b9a\u671f\u5206\u6790\u548c\u4f18\u5316\u7d22\u5f15\uff0c\u907f\u514d\u521b\u5efa\u8fc7\u591a\u7684\u7d22\u5f15\uff0c\u5f71\u54cd\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u4f7f\u7528 <strong>EXPLAIN<\/strong> \u8bed\u53e5\u6765\u5206\u6790\u67e5\u8be2\u7684\u6267\u884c\u8ba1\u5212\uff0c\u67e5\u770b\u662f\u5426\u4f7f\u7528\u4e86\u5408\u9002\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">4.5 <strong>\u4ec0\u4e48\u662f\u8054\u5408\u7d22\u5f15\uff1f\u5b83\u662f\u5982\u4f55\u5de5\u4f5c\u7684\uff1f<\/strong><\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u56de\u7b54\u8981\u70b9<\/strong>\uff1a<\/li>\n\n\n\n<li>\u8054\u5408\u7d22\u5f15\u662f\u57fa\u4e8e\u591a\u4e2a\u5217\u521b\u5efa\u7684\u7d22\u5f15\u3002<\/li>\n\n\n\n<li>\u5b83\u7684\u987a\u5e8f\u975e\u5e38\u91cd\u8981\uff0c\u67e5\u8be2\u6761\u4ef6\u4e2d\u5fc5\u987b\u5305\u542b\u7d22\u5f15\u7684\u524d\u7f00\u5217\uff0c\u624d\u80fd\u6709\u6548\u5229\u7528\u8054\u5408\u7d22\u5f15\u3002<\/li>\n<\/ul>\n\n\n\n<hr class=\"wp-block-separator has-alpha-channel-opacity\"\/>\n\n\n\n<h3 class=\"wp-block-heading\">5. <strong>\u603b\u7ed3<\/strong><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7d22\u5f15<\/strong> \u662f\u63d0\u5347\u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u6838\u5fc3\u5de5\u5177\uff0c\u901a\u8fc7\u5408\u7406\u4f7f\u7528\u7d22\u5f15\uff0c\u53ef\u4ee5\u663e\u8457\u63d0\u9ad8\u6570\u636e\u5e93\u7684\u8bfb\u6027\u80fd\u3002<\/li>\n\n\n\n<li>\u5e38\u89c1\u7684\u7d22\u5f15\u6570\u636e\u7ed3\u6784\u5305\u62ec <strong>B+ \u6811\u7d22\u5f15<\/strong>\u3001<strong>\u54c8\u5e0c\u7d22\u5f15<\/strong>\u3001<strong>\u5168\u6587\u7d22\u5f15<\/strong> \u548c <strong>\u7a7a\u95f4\u7d22\u5f15<\/strong>\u3002<\/li>\n\n\n\n<li>\u5728\u9762\u8bd5\u4e2d\uff0c\u5173\u952e\u662f\u8981\u4e86\u89e3\u4e0d\u540c\u7c7b\u578b\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u3001\u4f18\u7f3a\u70b9\u4ee5\u53ca\u5982\u4f55\u6839\u636e\u67e5\u8be2\u7684\u7279\u70b9\u4f18\u5316\u7d22\u5f15\u8bbe\u8ba1\u3002<\/li>\n<\/ul>\n\n\n\n<p class=\"wp-block-paragraph\">\u5e0c\u671b\u8fd9\u4e9b\u4fe1\u606f\u5bf9\u4f60\u51c6\u5907\u9762\u8bd5\u6709\u6240\u5e2e\u52a9\uff01\u5176\u4ed6\u9762\u8bd5\u76f8\u5173\u95ee\u9898\u53ef\u53c2\u8003\u5176\u4ed6\u76f8\u5173\u6587\u7ae0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5728 MySQL \u4e2d\uff0c\u7d22\u5f15\u662f\u4e3a\u4e86\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\u800c\u8bbe\u8ba1\u7684\u6570\u636e\u7ed3\u6784\u3002\u5b83\u53ef\u4ee5\u8ba9\u6570\u636e\u5e93\u5f15\u64ce\u66f4\u5feb\u901f\u5730\u67e5\u627e\u548c\u8bbf\u95ee\u6570\u636e\u3002\u4e86\u89e3\u7d22\u5f15 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[35],"tags":[],"class_list":["post-457","post","type-post","status-publish","format-standard","hentry","category-mysql"],"_links":{"self":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/457","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/comments?post=457"}],"version-history":[{"count":1,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/457\/revisions"}],"predecessor-version":[{"id":458,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/posts\/457\/revisions\/458"}],"wp:attachment":[{"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/media?parent=457"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/categories?post=457"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.laixuexila.com\/index.php\/wp-json\/wp\/v2\/tags?post=457"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}