{"id":33590,"date":"2026-10-14T12:00:00","date_gmt":"2026-10-14T04:00:00","guid":{"rendered":"https:\/\/cn.hostease.com\/blog\/?p=33590"},"modified":"2026-10-14T21:29:17","modified_gmt":"2026-10-14T13:29:17","slug":"mysql-slow-query-explain-index","status":"publish","type":"post","link":"https:\/\/cn.hostease.com\/blog\/tutorials\/mysql-slow-query-explain-index\/","title":{"rendered":"MySQL \u6162\u67e5\u8be2\u7d22\u5f15\u4f18\u5316\uff1aEXPLAIN \u6267\u884c\u8ba1\u5212\u4e0e\u8054\u5408\u7d22\u5f15\u8bbe\u8ba1"},"content":{"rendered":"<p>\u7f51\u7ad9\u7a81\u7136\u53d8\u5361\u3001\u540e\u53f0\u5217\u8868\u9875\u8981\u7b49\u597d\u51e0\u79d2\u624d\u5237\u51fa\u6765\u3001\u670d\u52a1\u5668\u8d1f\u8f7d\u83ab\u540d\u5347\u9ad8\u2014\u2014\u8fd9\u4e9b\u95ee\u9898\u80cc\u540e\uff0c\u5341\u6709\u516b\u4e5d\u85cf\u7740\u51e0\u6761 MySQL \u6162\u67e5\u8be2\uff08\u6267\u884c\u65f6\u95f4\u8d85\u51fa\u9884\u671f\u7684 SQL \u8bed\u53e5\uff09\u3002\u5f88\u591a\u7ad9\u957f\u9762\u5bf9\u6162\u67e5\u8be2\u7684\u7b2c\u4e00\u53cd\u5e94\u662f\u5347\u7ea7<a href=\"https:\/\/cn.hostease.com\/blog\/server\/\">\u670d\u52a1\u5668\u914d\u7f6e<\/a>\uff0c\u4f46\u5b9e\u9645\u7ecf\u9a8c\u662f\uff1a\u4e00\u6761\u6ca1\u8d70\u7d22\u5f15\u7684 SQL\uff0c\u6362\u518d\u5f3a\u7684\u673a\u5668\u4e5f\u53ea\u662f\u5728\u70e7\u94b1\u7eed\u547d\u3002\u8fd9\u7bc7\u6587\u7ae0\u8981\u89e3\u51b3\u7684\u6b63\u662f&#8221;\u5982\u4f55\u7528 EXPLAIN \u627e\u5230\u6162\u67e5\u8be2\u7684\u771f\u6b63\u539f\u56e0\uff0c\u5e76\u7528\u8054\u5408\u7d22\u5f15\u628a\u67e5\u8be2\u901f\u5ea6\u62c9\u56de\u6765&#8221;\u8fd9\u4e2a\u95ee\u9898\u3002\u6211\u4eec\u4f1a\u6309\u7167&#8221;\u5b9a\u4f4d\u6162\u8bed\u53e5 \u2192 \u8bfb\u61c2\u6267\u884c\u8ba1\u5212 \u2192 \u8bbe\u8ba1\u8054\u5408\u7d22\u5f15 \u2192 \u9a8c\u8bc1\u4f18\u5316\u6548\u679c&#8221;\u7684\u4e3b\u7ebf\u5c55\u5f00\uff0c\u6bcf\u4e00\u6b65\u90fd\u7ed9\u51fa\u53ef\u4ee5\u76f4\u63a5\u6267\u884c\u7684\u547d\u4ee4\u548c\u5224\u65ad\u6807\u51c6\uff0c\u5e2e\u52a9\u4f60\u4e0d\u9700\u8981\u6570\u636e\u5e93\u4e13\u5bb6\u80cc\u666f\uff0c\u4e5f\u80fd\u72ec\u7acb\u5b8c\u6210\u4e00\u6b21\u5b8c\u6574\u7684 MySQL \u6162\u67e5\u8be2\u4f18\u5316\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/mysql-optimization-explain-cover.webp\" alt=\"\u6570\u636e\u5e93\u6162\u67e5\u8be2\u6392\u67e5\u793a\u610f\u56fe\uff1a\u670d\u52a1\u5668\u6570\u636e\u5e93\u4e0e\u653e\u5927\u955c\u68c0\u67e5\u7d22\u5f15\u5c42\u7ea7\" loading=\"lazy\" \/><\/p>\n<h2>\u7b2c\u4e00\u6b65\uff1a\u627e\u5230\u6162\u67e5\u8be2\u5e76\u786e\u8ba4\u74f6\u9888\u5728\u54ea\u91cc<\/h2>\n<p>\u4f18\u5316\u4ece\u5b9a\u4f4d\u5f00\u59cb\u3002MySQL \u81ea\u5e26\u6162\u67e5\u8be2\u65e5\u5fd7\uff08slow query log\uff0c\u8bb0\u5f55\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u9608\u503c\u7684 SQL\uff09\uff0c\u5148\u786e\u8ba4\u5b83\u662f\u5426\u5f00\u542f\uff1a<\/p>\n<pre><code class=\"language-sql\">SHOW VARIABLES LIKE 'slow_query_log';\nSHOW VARIABLES LIKE 'long_query_time';\n<\/code><\/pre>\n<p>\u5982\u679c <code>slow_query_log<\/code> \u662f OFF\uff0c\u53ef\u4ee5\u4e34\u65f6\u5f00\u542f\u5e76\u8bbe\u7f6e 1 \u79d2\u9608\u503c\uff1a<\/p>\n<pre><code class=\"language-sql\">SET GLOBAL slow_query_log = ON;\nSET GLOBAL long_query_time = 1;\n<\/code><\/pre>\n<p>\u8dd1\u4e00\u6bb5\u65f6\u95f4\u540e\uff0c\u7528 <code>mysqldumpslow<\/code> \u6c47\u603b\u65e5\u5fd7\uff0c\u627e\u51fa\u51fa\u73b0\u9891\u7387\u6700\u9ad8\u3001\u8017\u65f6\u6700\u957f\u7684\u8bed\u53e5\u3002\u4f8b\u5982 <code>mysqldumpslow -s t -t 5 \/var\/lib\/mysql\/hostname-slow.log<\/code> \u4f1a\u5217\u51fa\u7d2f\u8ba1\u8017\u65f6\u6700\u9ad8\u7684 5 \u6761 SQL\u3002\u771f\u5b9e\u6848\u4f8b\uff1a\u4e00\u4e2a\u5916\u8d38\u7ad9\u7684\u8ba2\u5355\u5217\u8868\u9875\u5e73\u5747 4.2 \u79d2\u624d\u52a0\u8f7d\u5b8c\u6210\uff0c\u6162\u65e5\u5fd7\u91cc\u540c\u4e00\u6761 <code>SELECT ... WHERE customer_id = ? AND status = ? ORDER BY created_at DESC<\/code> \u6bcf\u5c0f\u65f6\u51fa\u73b0 800 \u591a\u6b21\u2014\u2014\u8fd9\u5c31\u662f\u5178\u578b\u7684&#8221;\u5355\u6761\u4e0d\u81f4\u547d\u3001\u603b\u91cf\u62d6\u57ae\u670d\u52a1\u5668&#8221;\u573a\u666f\uff0c\u4e5f\u662f\u7d22\u5f15\u4f18\u5316\u6536\u76ca\u6700\u5927\u7684\u7c7b\u578b\u3002<\/p>\n<p>\u62ff\u5230\u5177\u4f53 SQL \u4e4b\u540e\uff0c\u4e0d\u8981\u6025\u7740\u6539\u4ee3\u7801\u6216\u6025\u7740\u91cd\u542f\u6570\u636e\u5e93\u3002\u4e0b\u4e00\u6b65\u8981\u505a\u7684\uff0c\u662f\u8ba9 MySQL \u81ea\u5df1\u89e3\u91ca\u5b83\u6253\u7b97\u600e\u4e48\u6267\u884c\u8fd9\u6761\u8bed\u53e5\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/mysql-optimization-explain-flow.webp\" alt=\"EXPLAIN \u5206\u6790\u6d41\u7a0b\u793a\u610f\uff1a\u4ece\u67e5\u770b\u6267\u884c\u8ba1\u5212\u5230\u9a8c\u8bc1\u4f18\u5316\u6548\u679c\u7684\u56db\u4e2a\u9636\u6bb5\" loading=\"lazy\" \/><\/p>\n<h2>\u7b2c\u4e8c\u6b65\uff1a\u7528 EXPLAIN \u8bfb\u61c2\u6267\u884c\u8ba1\u5212<\/h2>\n<p>EXPLAIN\uff08\u6267\u884c\u8ba1\u5212\u5206\u6790\u547d\u4ee4\uff09\u662f MySQL \u63d0\u4f9b\u7684&#8221;\u900f\u89c6\u955c&#8221;\uff1a\u5728 SELECT \u524d\u9762\u52a0\u4e0a EXPLAIN\uff0cMySQL \u4e0d\u4f1a\u771f\u7684\u6267\u884c\u67e5\u8be2\uff0c\u800c\u662f\u8fd4\u56de\u5b83\u51c6\u5907\u91c7\u7528\u7684\u6267\u884c\u8def\u5f84\u3002\u4e0a\u9762\u90a3\u6761\u8ba2\u5355\u67e5\u8be2\u7684\u5206\u6790\u7ed3\u679c\uff0c\u5173\u952e\u5217\u5982\u4e0b\uff1a<\/p>\n<pre><code class=\"language-sql\">EXPLAIN SELECT * FROM orders\nWHERE customer_id = 1024 AND status = 'paid'\nORDER BY created_at DESC LIMIT 20;\n<\/code><\/pre>\n<table>\n<thead>\n<tr>\n<th>\u5217\u540d<\/th>\n<th>\u8f93\u51fa\u793a\u4f8b<\/th>\n<th>\u542b\u4e49<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>type<\/td>\n<td>ALL<\/td>\n<td>\u8bbf\u95ee\u7c7b\u578b\uff0cALL \u8868\u793a\u5168\u8868\u626b\u63cf<\/td>\n<\/tr>\n<tr>\n<td>key<\/td>\n<td>NULL<\/td>\n<td>\u5b9e\u9645\u4f7f\u7528\u7684\u7d22\u5f15\uff0cNULL \u8868\u793a\u6ca1\u7528\u4e0a<\/td>\n<\/tr>\n<tr>\n<td>rows<\/td>\n<td>186543<\/td>\n<td>\u9884\u8ba1\u626b\u63cf\u884c\u6570<\/td>\n<\/tr>\n<tr>\n<td>Extra<\/td>\n<td>Using where; Using filesort<\/td>\n<td>\u9644\u52a0\u64cd\u4f5c\uff0cfilesort \u8868\u793a\u9700\u8981\u989d\u5916\u6392\u5e8f<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u770b\u6267\u884c\u8ba1\u5212\u65f6\uff0c\u91cd\u70b9\u76ef\u4e09\u4e2a\u4fe1\u53f7\u3002\u7b2c\u4e00\u4e2a\u662f <code>type<\/code>\uff1a\u4ece\u4f18\u5230\u5dee\u4f9d\u6b21\u662f system &gt; const &gt; eq_ref &gt; ref &gt; range &gt; index &gt; ALL\uff0c\u5982\u679c\u770b\u5230 ALL \u4e14\u8868\u8d85\u8fc7\u51e0\u4e07\u884c\uff0c\u8fd9\u6761\u67e5\u8be2\u57fa\u672c\u5c31\u662f\u6162\u67e5\u8be2\u5143\u51f6\u3002\u7b2c\u4e8c\u4e2a\u662f <code>rows<\/code>\uff1a\u9884\u8ba1\u626b\u63cf 18 \u4e07\u884c\u53ea\u4e3a\u4e86\u53d6 20 \u6761\u6570\u636e\uff0c\u626b\u63cf\u91cf\u662f\u7ed3\u679c\u96c6\u7684\u4e5d\u5343\u500d\uff0c\u660e\u663e\u662f\u7d22\u5f15\u7f3a\u5931\u3002\u7b2c\u4e09\u4e2a\u662f <code>Extra<\/code> \u91cc\u7684 <code>Using filesort<\/code> \u548c <code>Using temporary<\/code>\uff0c\u524d\u8005\u8bf4\u660e\u6392\u5e8f\u65e0\u6cd5\u5229\u7528\u7d22\u5f15\u987a\u5e8f\uff0c\u540e\u8005\u8bf4\u660e\u9700\u8981\u5efa\u4e34\u65f6\u8868\uff0c\u4e24\u8005\u90fd\u4f1a\u968f\u6570\u636e\u91cf\u589e\u957f\u7ebf\u6027\u53d8\u6162\u3002<\/p>\n<p>\u521a\u624d\u7684\u4f8b\u5b50\u91cc\u4e09\u6761\u4fe1\u53f7\u5168\u90e8\u547d\u4e2d\uff1atype=ALL\u3001rows=18 \u4e07\u3001Extra \u5e26 filesort\u3002\u7ed3\u8bba\u5f88\u660e\u786e\u2014\u2014<code>orders<\/code> \u8868\u7f3a\u4e00\u4e2a\u80fd\u540c\u65f6\u8986\u76d6\u8fd9\u4e09\u4e2a\u67e5\u8be2\u6761\u4ef6\u7684\u8054\u5408\u7d22\u5f15\uff08\u7531\u591a\u4e2a\u5b57\u6bb5\u6309\u987a\u5e8f\u7ec4\u6210\u7684\u590d\u5408\u7d22\u5f15\uff09\u3002\u63a5\u4e0b\u6765\u5c31\u662f\u600e\u4e48\u8bbe\u8ba1\u5b83\u3002<\/p>\n<h2>\u7b2c\u4e09\u6b65\uff1a\u6309\u6700\u5de6\u524d\u7f00\u539f\u5219\u8bbe\u8ba1\u8054\u5408\u7d22\u5f15<\/h2>\n<p>\u8054\u5408\u7d22\u5f15\u7684\u8bbe\u8ba1\u6838\u5fc3\u662f\u6700\u5de6\u524d\u7f00\u539f\u5219\uff08\u8054\u5408\u7d22\u5f15\u6309\u5b57\u6bb5\u987a\u5e8f\u9010\u7ea7\u6392\u5e8f\uff0c\u67e5\u8be2\u6761\u4ef6\u5fc5\u987b\u4ece\u6700\u5de6\u5b57\u6bb5\u5f00\u59cb\u8fde\u7eed\u5339\u914d\u624d\u80fd\u7528\u4e0a\u7d22\u5f15\uff09\u3002\u53ef\u4ee5\u628a\u8054\u5408\u7d22\u5f15\u60f3\u8c61\u6210\u4e00\u672c\u7535\u8bdd\u7c3f\uff1a\u5148\u6309\u59d3\u6392\u5e8f\u3001\u59d3\u76f8\u540c\u518d\u6309\u540d\u6392\u5e8f\u3002\u4f60\u67e5&#8221;\u5f20&#8221;\u59d3\u5f88\u5feb\uff0c\u67e5&#8221;\u5f20\u4f1f&#8221;\u66f4\u5feb\uff0c\u4f46\u53ea\u67e5\u540d\u5b57\u53eb&#8221;\u4f1f&#8221;\u7684\u4eba\uff0c\u7535\u8bdd\u7c3f\u5c31\u5e2e\u4e0d\u4e0a\u5fd9\u4e86\u3002<\/p>\n<p>\u9488\u5bf9\u8ba2\u5355\u67e5\u8be2 <code>WHERE customer_id = ? AND status = ? ORDER BY created_at DESC<\/code>\uff0c\u63a8\u8350\u8fd9\u6837\u5efa\u7d22\u5f15\uff1a<\/p>\n<pre><code class=\"language-sql\">ALTER TABLE orders\nADD INDEX idx_customer_status_created (customer_id, status, created_at);\n<\/code><\/pre>\n<p>\u5b57\u6bb5\u987a\u5e8f\u7684\u786e\u5b9a\u6709\u4e09\u4e2a\u4f9d\u636e\u3002\u7b2c\u4e00\uff0c\u7b49\u503c\u6761\u4ef6\u5b57\u6bb5\u653e\u524d\u9762\uff1a<code>customer_id<\/code> \u548c <code>status<\/code> \u90fd\u662f\u7b49\u503c\u5339\u914d\uff0c\u6309\u533a\u5206\u5ea6\u9ad8\u7684\u5728\u524d\u6392\u3002\u7b2c\u4e8c\uff0c\u6392\u5e8f\u5b57\u6bb5\u653e\u6700\u540e\uff1a<code>created_at<\/code> \u653e\u5728\u7b2c\u4e09\u4f4d\u540e\uff0c\u524d\u9762\u4e24\u4e2a\u5b57\u6bb5\u5b9a\u4f4d\u5230\u7684\u6570\u636e\u5929\u7136\u6309\u65f6\u95f4\u6709\u5e8f\uff0c<code>Extra<\/code> \u91cc\u7684 filesort \u4f1a\u76f4\u63a5\u6d88\u5931\uff0c<code>ORDER BY ... DESC LIMIT 20<\/code> \u53ea\u9700\u8bfb 20 \u884c\u3002\u7b2c\u4e09\uff0c\u907f\u514d\u8303\u56f4\u5b57\u6bb5\u63d2\u4e2d\u95f4\uff1a\u5982\u679c\u6539\u6210 <code>(customer_id, created_at, status)<\/code>\uff0c<code>created_at<\/code> \u7684\u8303\u56f4\u6761\u4ef6\u4f1a\u622a\u65ad\u540e\u7eed\u5b57\u6bb5\u7684\u7d22\u5f15\u5339\u914d\uff0c<code>status<\/code> \u5c31\u7528\u4e0d\u4e0a\u4e86\u3002<\/p>\n<p>\u8bbe\u8ba1\u65f6\u8fd8\u8981\u907f\u5f00\u51e0\u4e2a\u5e38\u89c1\u8bef\u533a\uff1a\u5728\u7d22\u5f15\u5217\u4e0a\u4f7f\u7528\u51fd\u6570\u6216\u8fd0\u7b97\uff08\u5982 <code>WHERE DATE(created_at) = '2026-10-14'<\/code>\uff09\u4f1a\u5bfc\u81f4\u7d22\u5f15\u5931\u6548\uff0c\u5e94\u6539\u5199\u4e3a <code>WHERE created_at &gt;= '2026-10-14 00:00:00' AND created_at &lt; '2026-10-15 00:00:00'<\/code>\uff1b\u524d\u5bfc\u6a21\u7cca\u67e5\u8be2 <code>LIKE '%\u5173\u952e\u8bcd'<\/code> \u65e0\u6cd5\u8d70\u7d22\u5f15\uff0c\u6539\u6210 <code>LIKE '\u5173\u952e\u8bcd%'<\/code> \u524d\u7f00\u5339\u914d\u5373\u53ef\uff1b\u8054\u5408\u7d22\u5f15\u4e5f\u4e0d\u662f\u8d8a\u591a\u8d8a\u597d\uff0c\u6bcf\u4e2a\u7d22\u5f15\u90fd\u4f1a\u62d6\u6162\u5199\u5165\u5e76\u5360\u7528\u5b58\u50a8\uff0c\u4e00\u822c\u5efa\u8bae\u5355\u8868\u7d22\u5f15\u4e0d\u8d85\u8fc7 5-6 \u4e2a\u3002<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/mysql-optimization-explain-comparison.webp\" alt=\"\u65e0\u7d22\u5f15\u4e0e\u8054\u5408\u7d22\u5f15\u67e5\u8be2\u5bf9\u6bd4\uff1a\u6563\u4e71\u7eb8\u5806\u4e0e\u6574\u9f50\u7d22\u5f15\u5361\u7247\u5c42\" loading=\"lazy\" \/><\/p>\n<h2>\u7b2c\u56db\u6b65\uff1a\u9a8c\u8bc1\u6548\u679c\u4e0e\u7ebf\u4e0a\u53d8\u66f4\u6ce8\u610f\u4e8b\u9879<\/h2>\n<p>\u7d22\u5f15\u5efa\u597d\u540e\uff0c\u91cd\u65b0\u8dd1\u4e00\u904d EXPLAIN \u786e\u8ba4\u4e09\u4e2a\u6307\u6807\u90fd\u6539\u5584\u4e86\uff1a<\/p>\n<pre><code class=\"language-sql\">EXPLAIN SELECT * FROM orders\nWHERE customer_id = 1024 AND status = 'paid'\nORDER BY created_at DESC LIMIT 20;\n<\/code><\/pre>\n<p>\u4f18\u5316\u524d\u540e\u7684\u5bf9\u6bd4\u975e\u5e38\u76f4\u89c2\uff1a<\/p>\n<table>\n<thead>\n<tr>\n<th>\u6307\u6807<\/th>\n<th>\u4f18\u5316\u524d<\/th>\n<th>\u4f18\u5316\u540e<\/th>\n<\/tr>\n<\/thead>\n<tbody>\n<tr>\n<td>type<\/td>\n<td>ALL<\/td>\n<td>ref<\/td>\n<\/tr>\n<tr>\n<td>key<\/td>\n<td>NULL<\/td>\n<td>idx_customer_status_created<\/td>\n<\/tr>\n<tr>\n<td>rows<\/td>\n<td>186543<\/td>\n<td>42<\/td>\n<\/tr>\n<tr>\n<td>Extra<\/td>\n<td>Using where; Using filesort<\/td>\n<td>Backward index scan; NULL<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<p>\u626b\u63cf\u884c\u6570\u4ece 18.6 \u4e07\u964d\u5230 42\uff0c\u9875\u9762\u63a5\u53e3\u5b9e\u6d4b\u8017\u65f6\u4ece 4200ms \u964d\u5230 18ms\uff0c\u964d\u5e45\u8d85\u8fc7 99%\u3002\u8fd9\u6b63\u662f&#8221;\u6570\u636e\u5e93\u6027\u80fd\u95ee\u9898\u4f18\u5148\u67e5\u7d22\u5f15\uff0c\u800c\u4e0d\u662f\u5148\u5347\u7ea7\u786c\u4ef6&#8221;\u7684\u539f\u56e0\u2014\u2014\u540c\u6837\u7684 <a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS \u4e3b\u673a<\/a>\uff08<a href=\"https:\/\/cn.hostease.com\/vps\/\">VPS<\/a>\uff0c<a href=\"https:\/\/cn.hostease.com\/vps\/\">\u865a\u62df\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff09\u914d\u7f6e\uff0c\u7d22\u5f15\u8c03\u6574\u524d\u540e\u7684\u627f\u8f7d\u80fd\u529b\u53ef\u80fd\u76f8\u5dee\u51e0\u5341\u500d\u3002<\/p>\n<p>\u5728\u751f\u4ea7\u73af\u5883\u6267\u884c\u7d22\u5f15\u53d8\u66f4\u65f6\uff0c\u6709\u51e0\u70b9\u5fc5\u987b\u6ce8\u610f\u3002<code>ALTER TABLE ADD INDEX<\/code> \u5728 MySQL 8.0 \u7684 InnoDB \u5f15\u64ce\u4e0b\u9ed8\u8ba4\u4f7f\u7528 INSTANT\/INPLACE \u65b9\u5f0f\uff0c\u591a\u6570\u60c5\u51b5\u4e0d\u9501\u5199\u64cd\u4f5c\uff0c\u4f46\u5728\u6570\u636e\u91cf\u5f88\u5927\u7684\u8868\u4e0a\u4ecd\u5efa\u8bae\u907f\u5f00\u4e1a\u52a1\u9ad8\u5cf0\u6267\u884c\uff1b\u4e0a\u7ebf\u524d\u5148\u5728\u6d4b\u8bd5\u73af\u5883\u9a8c\u8bc1\uff0c\u5e76\u7528 <code>SHOW INDEX FROM orders;<\/code> \u786e\u8ba4\u7d22\u5f15\u5df2\u751f\u6548\u3002\u5982\u679c\u4f60\u6258\u7ba1\u7684\u662f WordPress \u8fd9\u7c7b\u5185\u5bb9\u7ad9\u70b9\uff0c\u6570\u636e\u5e93\u540c\u6837\u9075\u5faa\u8fd9\u4e9b\u89c4\u5219\uff0c\u53ef\u4ee5\u7ed3\u5408<a href=\"https:\/\/cn.hostease.com\/blog\/guides\/ttfb-hosting-optimization\/\">\u7f51\u7ad9\u6027\u80fd\u4f18\u5316\u6307\u5357<\/a>\u91cc\u7684 TTFB \u4f18\u5316\u601d\u8def\u4e00\u8d77\u6392\u67e5\uff1b\u4f7f\u7528<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u72ec\u7acb\u670d\u52a1\u5668<\/a>\u81ea\u5efa\u6570\u636e\u5e93\u7684\u7528\u6237\uff0c\u8fd8\u53ef\u4ee5\u5173\u6ce8<a href=\"https:\/\/cn.hostease.com\/blog\/server\/\">\u670d\u52a1\u5668\u6027\u80fd\u4f18\u5316<\/a>\u5206\u7c7b\u4e0b\u7684\u66f4\u591a\u5b9e\u6218\u7ecf\u9a8c\u3002<\/p>\n<h2>\u603b\u7ed3\u4e0e\u884c\u52a8\u5efa\u8bae<\/h2>\n<p>\u56de\u987e\u6574\u4e2a\u4f18\u5316\u6d41\u7a0b\uff1a\u5148\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\u9501\u5b9a\u9ad8\u9891\u6162\u8bed\u53e5\uff0c\u518d\u7528 EXPLAIN \u68c0\u67e5 type\u3001rows\u3001Extra \u4e09\u4e2a\u5173\u952e\u6307\u6807\uff0c\u7136\u540e\u6309&#8221;\u7b49\u503c\u5728\u524d\u3001\u8303\u56f4\u5176\u6b21\u3001\u6392\u5e8f\u5728\u540e&#8221;\u7684\u987a\u5e8f\u8bbe\u8ba1\u8054\u5408\u7d22\u5f15\uff0c\u6700\u540e\u91cd\u65b0\u6267\u884c EXPLAIN \u9a8c\u8bc1\u626b\u63cf\u884c\u6570\u662f\u5426\u4e0b\u964d\u5230\u5408\u7406\u6c34\u5e73\u3002\u8fd9\u5957\u65b9\u6cd5\u4e0d\u4f9d\u8d56\u7279\u5b9a\u6846\u67b6\u6216\u4e2d\u95f4\u4ef6\uff0c\u9002\u7528\u4e8e\u51e0\u4e4e\u6240\u6709 MySQL \u573a\u666f\u3002<\/p>\n<p>\u5982\u679c\u4f60\u6b63\u5728\u6392\u67e5\u7c7b\u4f3c\u95ee\u9898\uff0c\u5efa\u8bae\u6309\u8fd9\u4e2a\u987a\u5e8f\u884c\u52a8\uff1a\u5148\u5f00\u542f\u6162\u67e5\u8be2\u65e5\u5fd7\u8dd1 24 \u5c0f\u65f6\u62ff\u5230\u771f\u5b9e\u6570\u636e\uff0c\u518d\u6311\u51fa\u8017\u65f6\u6700\u957f\u7684 3 \u6761\u8bed\u53e5\u9010\u4e00\u505a EXPLAIN \u5206\u6790\uff0c\u786e\u8ba4\u7d22\u5f15\u95ee\u9898\u540e\u4f18\u5148\u4e3a\u6700\u9ad8\u9891\u7684\u67e5\u8be2\u8865\u4e0a\u8054\u5408\u7d22\u5f15\u3002\u603b\u7ed3\u4e00\u53e5\u8bdd\uff1a\u7edd\u5927\u591a\u6570\u6162\u67e5\u8be2\u7684\u6839\u6e90\u662f\u7d22\u5f15\u8bbe\u8ba1\uff0c\u800c\u4e0d\u662f\u786c\u4ef6\u4e0d\u591f\u3002\u5982\u679c\u4f60\u9700\u8981\u4e00\u53f0\u914d\u7f6e\u7a33\u5b9a\u3001\u652f\u6301\u81ea\u4e3b\u8c03\u4f18\u6570\u636e\u5e93\u53c2\u6570\u7684\u670d\u52a1\u5668\u6765\u627f\u8f7d\u4e1a\u52a1\u589e\u957f\uff0c\u53ef\u4ee5\u8003\u8651 Hostease \u7684<a href=\"https:\/\/cn.hostease.com\/web-hosting\/\">\u865a\u62df\u4e3b\u673a<\/a>\u6216 VPS\uff08\u865a\u62df<a href=\"https:\/\/cn.hostease.com\/dedicated-server\/\">\u4e13\u7528\u670d\u52a1\u5668<\/a>\uff09\u65b9\u6848\uff0c\u914d\u5408\u672c\u6587\u7684\u7d22\u5f15\u4f18\u5316\u65b9\u6cd5\uff0c\u8ba9\u6570\u636e\u5e93\u6027\u80fd\u548c\u786c\u4ef6\u8d44\u6e90\u90fd\u7528\u5728\u5200\u5203\u4e0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5982\u4f55\u89e3\u51b3 MySQL \u6162\u67e5\u8be2\u95ee\u9898\uff1f\u672c\u6587\u6559\u4f60\u7528 EXPLAIN \u8bfb\u61c2\u6267\u884c\u8ba1\u5212\uff0c\u638c\u63e1\u8054\u5408\u7d22\u5f15\u7684\u6700\u5de6\u524d\u7f00\u539f\u5219\u4e0e\u8bbe\u8ba1\u65b9\u6cd5\uff0c\u5e2e\u52a9\u4f60\u5728\u51e0\u5206\u949f\u5185\u5b9a\u4f4d\u5e76\u89e3\u51b3\u6570\u636e\u5e93\u6027\u80fd\u74f6\u9888\u3002<\/p>\n","protected":false},"author":2,"featured_media":33587,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[4099],"tags":[4525,545,4793,4524,5261],"class_list":["post-33590","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tutorials","tag-explain","tag-mysql","tag-4793","tag-4524","tag-5261"],"aioseo_notices":[],"jetpack_featured_media_url":"https:\/\/cn.hostease.com\/blog\/wp-content\/uploads\/2026\/10\/mysql-optimization-explain-cover.webp","jetpack_sharing_enabled":true,"_links":{"self":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33590","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/comments?post=33590"}],"version-history":[{"count":1,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33590\/revisions"}],"predecessor-version":[{"id":33591,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/posts\/33590\/revisions\/33591"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media\/33587"}],"wp:attachment":[{"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/media?parent=33590"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/categories?post=33590"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/cn.hostease.com\/blog\/wp-json\/wp\/v2\/tags?post=33590"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}