{"id":53,"date":"2024-08-14T16:34:09","date_gmt":"2024-08-14T08:34:09","guid":{"rendered":"https:\/\/www.linhw.cn\/?p=53"},"modified":"2024-08-14T16:34:09","modified_gmt":"2024-08-14T08:34:09","slug":"mysql%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98","status":"publish","type":"post","link":"https:\/\/www.linhw.cn\/index.php\/2024\/08\/14\/mysql%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98\/","title":{"rendered":"MySQL\u9762\u8bd5\u95ee\u9898"},"content":{"rendered":"\n<h2 class=\"wp-block-heading\">\u4e00\u3001\u7d22\u5f15<\/h2>\n\n\n\n<p><strong>1. \u7d22\u5f15\u539f\u7406 &amp; \u4e0d\u540c\u7d22\u5f15\u7c7b\u578b\u9002\u7528\u573a\u666f:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>B-Tree \u7d22\u5f15:<\/strong> MySQL \u9ed8\u8ba4\u7684\u7d22\u5f15\u7c7b\u578b\uff0c\u9002\u7528\u4e8e\u8303\u56f4\u67e5\u8be2\u3001\u6392\u5e8f\u3001\u4ee5\u53ca\u7cbe\u786e\u5339\u914d\u67e5\u8be2\uff08\u53ea\u8981\u7d22\u5f15\u5217\u662f\u88ab\u67e5\u8be2\u5217\u7684\u524d\u7f00\u5373\u53ef\uff09\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff1aWHERE age > 20 AND age &lt; 30\uff0cORDER BY age ASC<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>Hash \u7d22\u5f15:<\/strong> \u53ea\u9002\u7528\u4e8e\u7b49\u503c\u67e5\u8be2\uff0c\u4e0d\u80fd\u7528\u4e8e\u8303\u56f4\u67e5\u8be2\u548c\u6392\u5e8f\u3002\u7531\u4e8e Hash \u7d22\u5f15\u7ed3\u6784\u7684\u7279\u6b8a\u6027\uff0c\u5b83\u6bd4 B-Tree \u7d22\u5f15\u66f4\u5feb\u5730\u627e\u5230\u5355\u884c\u6570\u636e\uff0c\u4f46\u5bf9\u4e8e\u8303\u56f4\u67e5\u8be2\u6216\u6392\u5e8f\uff0c\u6548\u7387\u4f1a\u4f4e\u4e8e B-Tree \u7d22\u5f15\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff1aWHERE name = &#8216;John&#8217;<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5168\u6587\u7d22\u5f15 (FULLTEXT):<\/strong> \u7528\u4e8e\u5728 MyISAM \u8868\u4e2d\u8fdb\u884c\u5168\u6587\u641c\u7d22\u3002InnoDB \u5b58\u50a8\u5f15\u64ce\u5728 5.6 \u7248\u672c\u4e4b\u540e\u4e5f\u652f\u6301\u5168\u6587\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528 MATCH AGAINST \u8bed\u6cd5\u8fdb\u884c\u5168\u6587\u68c0\u7d22\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u8054\u5408\u7d22\u5f15\u3001\u8986\u76d6\u7d22\u5f15\u3001\u524d\u7f00\u7d22\u5f15\u6280\u5de7:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8054\u5408\u7d22\u5f15:<\/strong> \u5bf9\u591a\u4e2a\u5217\u5efa\u7acb\u4e00\u4e2a\u7d22\u5f15\u3002\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0c\u8054\u5408\u7d22\u5f15\u7684\u987a\u5e8f\u975e\u5e38\u91cd\u8981\uff0c\u9700\u8981\u6839\u636e\u67e5\u8be2\u6761\u4ef6\u7684\u9891\u7387\u548c\u987a\u5e8f\u6765\u521b\u5efa\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff1a\u5bf9\u4e8e\u67e5\u8be2 WHERE age = 25 AND name = &#8216;John&#8217;\uff0c \u521b\u5efa (age, name) \u7684\u8054\u5408\u7d22\u5f15\u6548\u7387\u9ad8\u4e8e (name, age)\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u8986\u76d6\u7d22\u5f15:<\/strong> \u5982\u679c\u67e5\u8be2\u7684\u5b57\u6bb5\u90fd\u5305\u542b\u5728\u7d22\u5f15\u4e2d\uff0cMySQL \u53ef\u4ee5\u76f4\u63a5\u4ece\u7d22\u5f15\u4e2d\u83b7\u53d6\u6570\u636e\uff0c\u800c\u4e0d\u9700\u8981\u56de\u8868\u67e5\u8be2\uff0c\u8fd9\u88ab\u79f0\u4e3a\u8986\u76d6\u7d22\u5f15\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff1a\u5bf9\u4e8e\u67e5\u8be2 SELECT age FROM users WHERE age = 25 AND name = &#8216;John&#8217;\uff0c \u5982\u679c\u5728 (age, name) \u4e0a\u5efa\u7acb\u4e86\u8054\u5408\u7d22\u5f15\uff0c\u90a3\u4e48\u8fd9\u4e2a\u7d22\u5f15\u5c31\u662f\u8986\u76d6\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u524d\u7f00\u7d22\u5f15:<\/strong> \u5bf9\u4e8e\u5f88\u957f\u7684\u5b57\u7b26\u4e32\u5217\uff0c\u53ef\u4ee5\u4f7f\u7528\u524d\u7f00\u7d22\u5f15\u6765\u63d0\u9ad8\u67e5\u8be2\u6548\u7387\u3002\u524d\u7f00\u7d22\u5f15\u662f\u6307\u53ea\u5bf9\u5b57\u7b26\u4e32\u7684\u524d\u51e0\u4e2a\u5b57\u7b26\u521b\u5efa\u7d22\u5f15\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u51cf\u5c0f\u7d22\u5f15\u7684\u5927\u5c0f\uff0c\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff1a\u5bf9\u4e8e varchar(255) \u7684 email \u5217\uff0c\u53ef\u4ee5\u53ea\u5bf9\u524d 10 \u4e2a\u5b57\u7b26\u521b\u5efa\u7d22\u5f15 (email(10))\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>3. \u7d22\u5f15\u5931\u6548\u573a\u666f &amp; \u9009\u62e9\u6700\u4f18\u7d22\u5f15:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u7d22\u5f15\u5931\u6548\u5e38\u89c1\u573a\u666f:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5bf9\u7d22\u5f15\u5217\u8fdb\u884c\u51fd\u6570\u64cd\u4f5c\u3001\u7c7b\u578b\u8f6c\u6362\u3001\u8fd0\u7b97\u7b49\uff0c\u4f8b\u5982 WHERE YEAR(create_time) = 2023<\/li>\n\n\n\n<li>\u4f7f\u7528 != \u6216 NOT IN \u64cd\u4f5c\u7b26<\/li>\n\n\n\n<li>\u4f7f\u7528 LIKE \u64cd\u4f5c\u7b26\uff0c\u4e14\u901a\u914d\u7b26 % \u4e0d\u662f\u5728\u5b57\u7b26\u4e32\u672b\u5c3e<\/li>\n\n\n\n<li>\u4f7f\u7528 OR \u8fde\u63a5\u7684\u591a\u4e2a\u6761\u4ef6\uff0c\u9664\u975e\u6240\u6709\u6761\u4ef6\u90fd\u6709\u7d22\u5f15<\/li>\n\n\n\n<li>\u67e5\u8be2\u6761\u4ef6\u4e2d\u4f7f\u7528\u4e86\u975e B-Tree \u7d22\u5f15\u652f\u6301\u7684\u64cd\u4f5c\u7b26\uff0c\u4f8b\u5982\uff1a\u4f7f\u7528 Hash \u7d22\u5f15\u8fdb\u884c\u8303\u56f4\u67e5\u8be2<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u9009\u62e9\u6700\u4f18\u7d22\u5f15:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f18\u5148\u8003\u8651\u9009\u62e9\u5ea6\u9ad8\u7684\u5217\u4f5c\u4e3a\u7d22\u5f15\uff0c\u9009\u62e9\u5ea6\u662f\u6307\u4e0d\u91cd\u590d\u6570\u636e\u7684\u6bd4\u4f8b\uff0c\u4f8b\u5982\uff1a\u6027\u522b\u5217\u7684\u9009\u62e9\u5ea6\u5c31\u4f4e\u4e8e\u8eab\u4efd\u8bc1\u53f7\u7801\u5217<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u7ecf\u5e38\u53c2\u4e0e\u8fde\u63a5\u67e5\u8be2\u7684\u5217\u3001\u6392\u5e8f\u7684\u5217\uff0c\u90fd\u5e94\u8be5\u5efa\u7acb\u7d22\u5f15<\/li>\n\n\n\n<li>\u5c3d\u91cf\u4f7f\u7528\u8986\u76d6\u7d22\u5f15\uff0c\u51cf\u5c11\u56de\u8868\u67e5\u8be2<\/li>\n\n\n\n<li>\u4f7f\u7528 EXPLAIN \u5206\u6790\u67e5\u8be2\u8bed\u53e5\uff0c\u67e5\u770b\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\uff0c\u5e76\u6839\u636e\u5b9e\u9645\u60c5\u51b5\u8c03\u6574\u7d22\u5f15<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>4. \u6392\u67e5 &amp; \u89e3\u51b3\u6162\u67e5\u8be2:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u6392\u67e5\u6b65\u9aa4:<\/strong>\n<ol class=\"wp-block-list\">\n<li>\u4f7f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\u5b9a\u4f4d\u6267\u884c\u65f6\u95f4\u8d85\u8fc7\u9608\u503c\u7684 SQL \u8bed\u53e5<\/li>\n\n\n\n<li>\u4f7f\u7528 EXPLAIN \u5206\u6790\u6162\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u67e5\u770b\u7d22\u5f15\u4f7f\u7528\u60c5\u51b5\u3001\u626b\u63cf\u884c\u6570\u3001\u662f\u5426\u4f7f\u7528\u4e86\u4e34\u65f6\u8868\u3001\u6587\u4ef6\u6392\u5e8f\u7b49<\/li>\n\n\n\n<li>\u68c0\u67e5 MySQL \u670d\u52a1\u5668\u72b6\u6001\uff0c\u67e5\u770b CPU\u3001\u5185\u5b58\u3001I\/O \u7b49\u8d44\u6e90\u7684\u4f7f\u7528\u60c5\u51b5\uff0c\u5224\u65ad\u662f\u5426\u5b58\u5728\u8d44\u6e90\u74f6\u9888<\/li>\n<\/ol>\n<\/li>\n\n\n\n<li><strong>\u89e3\u51b3\u65b9\u6cd5:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f18\u5316 SQL \u8bed\u53e5\uff0c\u4f8b\u5982\uff1a\u907f\u514d\u4f7f\u7528 SELECT *\u3001\u4f18\u5316 WHERE \u6761\u4ef6\u3001\u907f\u514d\u5b50\u67e5\u8be2\u7b49<\/li>\n\n\n\n<li>\u6dfb\u52a0\u7d22\u5f15\uff0c\u9488\u5bf9\u6162\u67e5\u8be2\u8bed\u53e5\u7684\u67e5\u8be2\u6761\u4ef6\uff0c\u521b\u5efa\u5408\u9002\u7684\u7d22\u5f15<\/li>\n\n\n\n<li>\u8c03\u6574 MySQL \u670d\u52a1\u5668\u53c2\u6570\uff0c\u4f8b\u5982\uff1a\u589e\u5927\u7f13\u51b2\u6c60\u5927\u5c0f\u3001\u4f18\u5316\u6392\u5e8f\u7f13\u5b58\u533a\u5927\u5c0f\u7b49<\/li>\n\n\n\n<li>\u5347\u7ea7\u786c\u4ef6\u914d\u7f6e\uff0c\u4f8b\u5982\uff1a\u4f7f\u7528\u66f4\u5feb\u7684\u786c\u76d8\u3001\u589e\u52a0\u5185\u5b58\u7b49<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e8c\u3001\u5b58\u50a8\u5f15\u64ce<\/h2>\n\n\n\n<p><strong>1. InnoDB vs. MyISAM:<\/strong><\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><tbody><tr><td>\u7279\u6027<\/td><td>InnoDB<\/td><td>MyISAM<\/td><\/tr><tr><td>\u4e8b\u52a1<\/td><td>\u652f\u6301<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>\u5916\u952e<\/td><td>\u652f\u6301<\/td><td>\u4e0d\u652f\u6301<\/td><\/tr><tr><td>\u9501\u673a\u5236<\/td><td>\u884c\u7ea7\u9501\uff0c\u652f\u6301\u5e76\u53d1\u6027\u80fd\u66f4\u597d<\/td><td>\u8868\u7ea7\u9501\uff0c\u5e76\u53d1\u6027\u80fd\u8f83\u5dee<\/td><\/tr><tr><td>\u7d22\u5f15\u5b9e\u73b0<\/td><td>\u805a\u7c07\u7d22\u5f15\uff0c\u6570\u636e\u5b58\u50a8\u5728\u7d22\u5f15\u4e2d\uff0c\u9700\u8981\u6839\u636e\u4e3b\u952e\u67e5\u627e\u6570\u636e<\/td><td>\u975e\u805a\u7c07\u7d22\u5f15\uff0c\u7d22\u5f15\u548c\u6570\u636e\u5206\u5f00\u5b58\u50a8\uff0c\u9700\u8981\u5148\u627e\u5230\u7d22\u5f15\uff0c\u518d\u6839\u636e\u7d22\u5f15\u627e\u5230\u6570\u636e<\/td><\/tr><tr><td>\u9002\u7528\u573a\u666f<\/td><td>\u9700\u8981\u4e8b\u52a1\u652f\u6301\u3001\u9ad8\u5e76\u53d1\u3001\u6570\u636e\u4e00\u81f4\u6027\u8981\u6c42\u9ad8\u7684\u573a\u666f\uff0c\u4f8b\u5982\uff1a\u7535\u5546\u4ea4\u6613\u7cfb\u7edf<\/td><td>\u4e0d\u9700\u8981\u4e8b\u52a1\u652f\u6301\u3001\u5e76\u53d1\u8981\u6c42\u4e0d\u9ad8\u7684\u573a\u666f\uff0c\u4f8b\u5982\uff1a\u535a\u5ba2\u7cfb\u7edf\u3001\u62a5\u8868\u7cfb\u7edf<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>2. \u65b0\u578b\u5b58\u50a8\u5f15\u64ce:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>TokuDB:<\/strong> \u4f7f\u7528 Fractal Tree \u7d22\u5f15\u7ed3\u6784\uff0c\u5177\u6709\u66f4\u9ad8\u7684\u538b\u7f29\u7387\u3001\u66f4\u5feb\u7684\u5199\u5165\u901f\u5ea6\uff0c\u9002\u7528\u4e8e\u5199\u591a\u8bfb\u5c11\u7684\u573a\u666f\uff0c\u4f8b\u5982\uff1a\u65e5\u5fd7\u7cfb\u7edf\u3001\u7269\u8054\u7f51\u6570\u636e\u5b58\u50a8\u7b49\u3002<\/li>\n\n\n\n<li><strong>MyRocks:<\/strong> \u57fa\u4e8e RocksDB \u5f00\u53d1\u7684\u5b58\u50a8\u5f15\u64ce\uff0c\u5177\u6709\u66f4\u9ad8\u7684\u5199\u5165\u6027\u80fd\u548c\u538b\u7f29\u7387\uff0c\u9002\u7528\u4e8e\u9ad8\u5e76\u53d1\u5199\u5165\u3001\u5927\u6570\u636e\u91cf\u5b58\u50a8\u7684\u573a\u666f\uff0c\u4f8b\u5982\uff1a\u76d1\u63a7\u7cfb\u7edf\u3001\u793e\u4ea4\u5a92\u4f53\u6570\u636e\u5b58\u50a8\u7b49\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e09\u3001SQL \u4f18\u5316<\/h2>\n\n\n\n<p><strong>1. \u5199\u51fa\u9ad8\u6548\u7684 SQL \u8bed\u53e5 &amp; \u5408\u7406\u4f18\u5316:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u907f\u514d\u4f7f\u7528 SELECT *\uff0c\u53ea\u67e5\u8be2\u9700\u8981\u7684\u5217<\/li>\n\n\n\n<li>\u4f7f\u7528\u5408\u9002\u7684\u7d22\u5f15\uff0c\u907f\u514d\u5168\u8868\u626b\u63cf<\/li>\n\n\n\n<li>\u4f18\u5316 WHERE \u6761\u4ef6\uff0c\u5c3d\u91cf\u4f7f\u7528\u7d22\u5f15\u5217\u8fdb\u884c\u67e5\u8be2<\/li>\n\n\n\n<li>\u907f\u514d\u4f7f\u7528\u5b50\u67e5\u8be2\uff0c\u5c3d\u91cf\u4f7f\u7528 JOIN \u64cd\u4f5c<\/li>\n\n\n\n<li>\u4f7f\u7528 LIMIT \u9650\u5236\u67e5\u8be2\u7ed3\u679c\u6570\u91cf<\/li>\n\n\n\n<li>\u4f7f\u7528 UNION ALL \u4ee3\u66ff UNION\uff0c\u907f\u514d\u53bb\u91cd\u64cd\u4f5c<\/li>\n\n\n\n<li>\u5bf9\u4e8e\u5927\u8868\uff0c\u4f7f\u7528\u5206\u9875\u67e5\u8be2\uff0c\u907f\u514d\u4e00\u6b21\u6027\u52a0\u8f7d\u8fc7\u591a\u6570\u636e<\/li>\n<\/ul>\n\n\n\n<p><strong>2. EXPLAIN \u5de5\u5177\u7684\u4f7f\u7528 &amp; \u89e3\u8bfb\u6267\u884c\u8ba1\u5212:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 EXPLAIN \u547d\u4ee4\u53ef\u4ee5\u67e5\u770b SQL \u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u5305\u62ec\uff1a\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u7684\u7d22\u5f15<\/li>\n\n\n\n<li>\u626b\u63cf\u7684\u884c\u6570<\/li>\n\n\n\n<li>\u4f7f\u7528\u7684\u6392\u5e8f\u65b9\u5f0f<\/li>\n\n\n\n<li>\u662f\u5426\u4f7f\u7528\u4e86\u4e34\u65f6\u8868<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u6839\u636e\u6267\u884c\u8ba1\u5212\uff0c\u53ef\u4ee5\u5206\u6790 SQL \u8bed\u53e5\u7684\u6027\u80fd\u74f6\u9888\uff0c\u5e76\u8fdb\u884c\u76f8\u5e94\u7684\u4f18\u5316<\/li>\n<\/ul>\n\n\n\n<p><strong>3. \u5206\u6790 SQL \u8bed\u53e5\u7684\u6027\u80fd\u74f6\u9888 &amp; \u7ed9\u51fa\u4f18\u5316\u5efa\u8bae:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f8b\u5982\uff0c\u5bf9\u4e8e\u4ee5\u4e0b SQL \u8bed\u53e5:<\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">      <code>SELECT * \n FROM orders o \n JOIN users u ON o.user_id = u.id \n WHERE o.create_time &gt; '2023-03-01' \n ORDER BY o.order_amount DESC\n LIMIT 10;<\/code>\n    <\/pre>\n\n\n\n<p>content_copy Use code <a href=\"https:\/\/support.google.com\/legal\/answer\/13505487\" target=\"_blank\" rel=\"noreferrer noopener\">with caution<\/a>.SQL<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u53ef\u80fd\u5b58\u5728\u7684\u6027\u80fd\u74f6\u9888:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u4e86 SELECT *\uff0c\u67e5\u8be2\u4e86\u6240\u6709\u5217<\/li>\n\n\n\n<li>\u6ca1\u6709\u4f7f\u7528\u7d22\u5f15\uff0c\u5bfc\u81f4\u5168\u8868\u626b\u63cf<\/li>\n\n\n\n<li>\u4f7f\u7528\u4e86 ORDER BY \u548c LIMIT\uff0c\u9700\u8981\u5bf9\u7ed3\u679c\u96c6\u8fdb\u884c\u6392\u5e8f<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u4f18\u5316\u5efa\u8bae:<\/strong><\/li>\n<\/ul>\n\n\n\n<pre class=\"wp-block-preformatted\">      <code>SELECT o.id, o.order_amount, u.name \nFROM orders o \nJOIN users u ON o.user_id = u.id \nWHERE o.create_time &gt; '2023-03-01' \nORDER BY o.create_time DESC, o.order_amount DESC \nLIMIT 10;<\/code>\n    <\/pre>\n\n\n\n<p>content_copy Use code <a href=\"https:\/\/support.google.com\/legal\/answer\/13505487\" target=\"_blank\" rel=\"noreferrer noopener\">with caution<\/a>.SQL<\/p>\n\n\n\n<pre class=\"wp-block-preformatted\">      <code>*   \u53ea\u67e5\u8be2\u9700\u8981\u7684\u5217\n*   \u5728 `orders` \u8868\u7684 `create_time` \u5217\u4e0a\u521b\u5efa\u7d22\u5f15\n*  \u8c03\u6574 `ORDER BY` \u7684\u987a\u5e8f\uff0c\u5148\u6309\u7167 `create_time` \u6392\u5e8f\uff0c\u518d\u6309\u7167 `order_amount` \u6392\u5e8f\uff0c\u5229\u7528\u7d22\u5f15\u63d0\u9ad8\u6392\u5e8f\u6548\u7387<\/code>\n    <\/pre>\n\n\n\n<p>content_copy Use code <a href=\"https:\/\/support.google.com\/legal\/answer\/13505487\" target=\"_blank\" rel=\"noreferrer noopener\">with caution<\/a>.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">\u56db\u3001\u7f13\u5b58\u673a\u5236<\/h2>\n\n\n\n<p><strong>1. MySQL \u67e5\u8be2\u7f13\u5b58\u5de5\u4f5c\u539f\u7406 &amp; \u5931\u6548\u60c5\u51b5 &amp; \u63d0\u9ad8\u547d\u4e2d\u7387:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u5de5\u4f5c\u539f\u7406:<\/strong> MySQL \u7684\u67e5\u8be2\u7f13\u5b58\u5b58\u50a8\u4e86\u67e5\u8be2\u8bed\u53e5\u548c\u67e5\u8be2\u7ed3\u679c\u7684\u6620\u5c04\u5173\u7cfb\u3002\u5f53\u63a5\u6536\u5230\u4e00\u4e2a\u67e5\u8be2\u8bf7\u6c42\u65f6\uff0cMySQL \u4f1a\u5148\u68c0\u67e5\u67e5\u8be2\u7f13\u5b58\uff0c\u5982\u679c\u7f13\u5b58\u4e2d\u5b58\u5728\u76f8\u540c\u7684\u67e5\u8be2\u8bed\u53e5\uff0c\u5c31\u76f4\u63a5\u8fd4\u56de\u7f13\u5b58\u4e2d\u7684\u7ed3\u679c\uff0c\u5426\u5219\u624d\u4f1a\u6267\u884c\u67e5\u8be2\u64cd\u4f5c\u5e76\u5c06\u7ed3\u679c\u7f13\u5b58\u8d77\u6765\u3002<\/li>\n\n\n\n<li><strong>\u5931\u6548\u60c5\u51b5:<\/strong> \u5f53\u8868\u4e2d\u7684\u6570\u636e\u53d1\u751f\u4efb\u4f55\u53d8\u5316\uff08\u4f8b\u5982\uff1a\u63d2\u5165\u3001\u66f4\u65b0\u3001\u5220\u9664\uff09\u65f6\uff0c\u4e0e\u8be5\u8868\u76f8\u5173\u7684\u67e5\u8be2\u7f13\u5b58\u90fd\u4f1a\u5931\u6548\u3002<\/li>\n\n\n\n<li><strong>\u63d0\u9ad8\u547d\u4e2d\u7387:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u4f7f\u7528\u76f8\u540c\u7684\u67e5\u8be2\u8bed\u53e5<\/li>\n\n\n\n<li>\u907f\u514d\u67e5\u8be2\u7f13\u5b58\u6c61\u67d3\uff0c\u4f8b\u5982\uff1a\u4e0d\u8981\u5728\u67e5\u8be2\u8bed\u53e5\u4e2d\u4f7f\u7528\u53d8\u91cf\u6216\u51fd\u6570<\/li>\n\n\n\n<li>\u5408\u7406\u8bbe\u7f6e\u67e5\u8be2\u7f13\u5b58\u5927\u5c0f\uff0c\u907f\u514d\u7f13\u5b58\u7a7a\u95f4\u4e0d\u8db3\u5bfc\u81f4\u7f13\u5b58\u5931\u6548<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u7f13\u51b2\u6c60:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u4f5c\u7528:<\/strong> \u7f13\u51b2\u6c60\u662f MySQL \u4e2d\u4e00\u5757\u7528\u4e8e\u7f13\u5b58\u8868\u6570\u636e\u548c\u7d22\u5f15\u7684\u5185\u5b58\u533a\u57df\uff0c\u53ef\u4ee5\u51cf\u5c11\u78c1\u76d8 I\/O \u64cd\u4f5c\uff0c\u63d0\u9ad8\u67e5\u8be2\u901f\u5ea6\u3002<\/li>\n\n\n\n<li><strong>\u4f18\u5316:<\/strong> \u5408\u7406\u8bbe\u7f6e\u7f13\u51b2\u6c60\u5927\u5c0f\uff0c\u6839\u636e\u670d\u52a1\u5668\u5185\u5b58\u5927\u5c0f\u548c\u4e1a\u52a1\u8d1f\u8f7d\u8fdb\u884c\u8c03\u6574\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e94\u3001\u9501\u673a\u5236<\/h2>\n\n\n\n<p><strong>1. \u4e0d\u540c\u9694\u79bb\u7ea7\u522b\u4e0b\u9501\u7684\u8fd0\u4f5c\u673a\u5236:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8bfb\u672a\u63d0\u4ea4 (Read Uncommitted):<\/strong> \u6700\u4f4e\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5141\u8bb8\u8bfb\u53d6\u672a\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u80fd\u4f1a\u51fa\u73b0\u810f\u8bfb\u3001\u5e7b\u8bfb\u7b49\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u8bfb\u63d0\u4ea4 (Read Committed):<\/strong> \u53ea\u80fd\u8bfb\u53d6\u5df2\u63d0\u4ea4\u7684\u6570\u636e\uff0c\u53ef\u4ee5\u89e3\u51b3\u810f\u8bfb\u95ee\u9898\uff0c\u4f46\u4ecd\u7136\u53ef\u80fd\u4f1a\u51fa\u73b0\u4e0d\u53ef\u91cd\u590d\u8bfb\u548c\u5e7b\u8bfb\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u53ef\u91cd\u590d\u8bfb (Repeatable Read):<\/strong> MySQL \u9ed8\u8ba4\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u5728\u540c\u4e00\u4e2a\u4e8b\u52a1\u5185\uff0c\u591a\u6b21\u8bfb\u53d6\u76f8\u540c\u7684\u6570\u636e\uff0c\u603b\u662f\u8fd4\u56de\u76f8\u540c\u7684\u7ed3\u679c\uff0c\u53ef\u4ee5\u89e3\u51b3\u810f\u8bfb\u548c\u4e0d\u53ef\u91cd\u590d\u8bfb\u95ee\u9898\uff0c\u4f46\u4ecd\u7136\u53ef\u80fd\u4f1a\u51fa\u73b0\u5e7b\u8bfb\u95ee\u9898\u3002<\/li>\n\n\n\n<li><strong>\u4e32\u884c\u5316 (Serializable):<\/strong> \u6700\u9ad8\u7684\u9694\u79bb\u7ea7\u522b\uff0c\u6240\u6709\u4e8b\u52a1\u4e32\u884c\u6267\u884c\uff0c\u53ef\u4ee5\u89e3\u51b3\u6240\u6709\u5e76\u53d1\u95ee\u9898\uff0c\u4f46\u6027\u80fd\u6700\u5dee\u3002<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u4e0d\u540c\u9501\u7b56\u7565\u5bf9\u5e76\u53d1\u6027\u80fd\u7684\u5f71\u54cd &amp; \u907f\u514d\u6b7b\u9501:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u95f4\u9699\u9501 (Gap Lock):<\/strong> InnoDB \u5f15\u64ce\u7279\u6709\u7684\u9501\uff0c\u7528\u4e8e\u9501\u5b9a\u7d22\u5f15\u8bb0\u5f55\u4e4b\u95f4\u7684\u201c\u95f4\u9699\u201d\uff0c\u9632\u6b62\u5e7b\u8bfb\u3002<\/li>\n\n\n\n<li><strong>\u884c\u7ea7\u9501 (Row-level Lock):<\/strong> \u5bf9\u4e00\u884c\u6570\u636e\u8fdb\u884c\u52a0\u9501\uff0c\u7c92\u5ea6\u5c0f\uff0c\u5e76\u53d1\u6027\u80fd\u597d\uff0c\u4f46\u5f00\u9500\u4e5f\u6bd4\u8f83\u5927\u3002<\/li>\n\n\n\n<li><strong>\u8868\u7ea7\u9501 (Table-level Lock):<\/strong> \u5bf9\u6574\u5f20\u8868\u8fdb\u884c\u52a0\u9501\uff0c\u7c92\u5ea6\u5927\uff0c\u5e76\u53d1\u6027\u80fd\u5dee\uff0c\u4f46\u5f00\u9500\u5c0f\u3002<\/li>\n\n\n\n<li><strong>\u907f\u514d\u6b7b\u9501:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5c3d\u91cf\u907f\u514d\u540c\u65f6\u6301\u6709\u591a\u4e2a\u9501<\/li>\n\n\n\n<li>\u5c3d\u91cf\u4f7f\u7528\u76f8\u540c\u7684\u52a0\u9501\u987a\u5e8f<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u5408\u7406\u7684\u9501\u8d85\u65f6\u65f6\u95f4<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u516d\u3001\u67b6\u6784\u8bbe\u8ba1\u4e0e\u9ad8\u53ef\u7528<\/h2>\n\n\n\n<p><strong>1. \u4e3b\u4ece\u590d\u5236<\/strong>:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u57fa\u4e8e\u8bed\u53e5\u7684\u590d\u5236\uff08SBR\uff09:<\/strong> \u4e3b\u5e93\u8bb0\u5f55 SQL \u8bed\u53e5\u5e76\u53d1\u9001\u7ed9\u4ece\u5e93\uff0c\u4ece\u5e93\u6267\u884c\u76f8\u540c\u7684 SQL \u8bed\u53e5\u3002\u4f18\u70b9\u662f\u5b9e\u73b0\u7b80\u5355\uff0c\u7f3a\u70b9\u662f\u5bb9\u6613\u51fa\u73b0\u6570\u636e\u4e0d\u4e00\u81f4\u7684\u60c5\u51b5\u3002<\/li>\n\n\n\n<li><strong>\u57fa\u4e8e\u884c\u7684\u590d\u5236\uff08RBR\uff09:<\/strong> \u4e3b\u5e93\u8bb0\u5f55\u6570\u636e\u7684\u53d8\u66f4\u64cd\u4f5c\u5e76\u53d1\u9001\u7ed9\u4ece\u5e93\uff0c\u4ece\u5e93\u5e94\u7528\u8fd9\u4e9b\u53d8\u66f4\u64cd\u4f5c\u3002\u4f18\u70b9\u662f\u53ef\u4ee5\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\uff0c\u7f3a\u70b9\u662f\u590d\u5236\u7684\u65e5\u5fd7\u91cf\u8f83\u5927\u3002<\/li>\n\n\n\n<li><strong>\u6df7\u5408\u6a21\u5f0f\u590d\u5236\uff08MBR\uff09:<\/strong> \u7ed3\u5408\u4e86 SBR \u548c RBR \u7684\u4f18\u70b9\uff0c\u5bf9\u4e8e\u4e00\u4e9b DDL \u8bed\u53e5\u4f7f\u7528 SBR \u6a21\u5f0f\u590d\u5236\uff0c\u5bf9\u4e8e DML \u8bed\u53e5\u4f7f\u7528 RBR \u6a21\u5f0f\u590d\u5236\u3002<\/li>\n\n\n\n<li><strong>\u4e3b\u4ece\u5ef6\u8fdf &amp; \u76d1\u63a7 &amp; \u89e3\u51b3\u9519\u8bef:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4e3b\u4ece\u5ef6\u8fdf\u662f\u6307\u4ece\u5e93\u7684\u6570\u636e\u66f4\u65b0\u843d\u540e\u4e8e\u4e3b\u5e93\u3002<\/li>\n\n\n\n<li>\u53ef\u4ee5\u901a\u8fc7\u76d1\u63a7\u5de5\u5177\u76d1\u63a7\u4e3b\u4ece\u5ef6\u8fdf\u60c5\u51b5\uff0c\u4f8b\u5982\uff1apt-heartbeat\u3001MHA \u7b49\u3002<\/li>\n\n\n\n<li>\u89e3\u51b3\u4e3b\u4ece\u5ef6\u8fdf\u7684\u65b9\u6cd5\u5305\u62ec\uff1a\u4f18\u5316\u4e3b\u5e93\u6027\u80fd\u3001\u4f7f\u7528\u5e76\u884c\u590d\u5236\u3001\u4f7f\u7528\u534a\u540c\u6b65\u590d\u5236\u7b49\u3002<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u8bfb\u5199\u5206\u79bb:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u57fa\u4e8e\u4e2d\u95f4\u4ef6:<\/strong> \u4f7f\u7528\u6570\u636e\u5e93\u4e2d\u95f4\u4ef6\uff08\u4f8b\u5982\uff1aMyCat, ShardingSphere\uff09\u6765\u5b9e\u73b0\u8bfb\u5199\u5206\u79bb\uff0c\u4e2d\u95f4\u4ef6\u8d1f\u8d23\u5c06\u8bfb\u8bf7\u6c42\u8def\u7531\u5230\u4ece\u5e93\uff0c\u5199\u8bf7\u6c42\u8def\u7531\u5230\u4e3b\u5e93\u3002<\/li>\n\n\n\n<li><strong>\u57fa\u4e8e\u6570\u636e\u5e93\u4ee3\u7406:<\/strong> \u4f7f\u7528\u6570\u636e\u5e93\u4ee3\u7406\u670d\u52a1\u5668\uff08\u4f8b\u5982\uff1aProxySQL\uff09\u6765\u5b9e\u73b0\u8bfb\u5199\u5206\u79bb\uff0c\u4ee3\u7406\u670d\u52a1\u5668\u63a5\u6536\u5e94\u7528\u7a0b\u5e8f\u7684\u8bf7\u6c42\uff0c\u5e76\u8f6c\u53d1\u5230\u540e\u7aef\u7684\u6570\u636e\u5e93\u670d\u52a1\u5668\u3002<\/li>\n\n\n\n<li><strong>\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u534a\u540c\u6b65\u590d\u5236\uff0c\u4fdd\u8bc1\u6570\u636e\u5199\u5165\u4e3b\u5e93\u540e\u624d\u8fd4\u56de\u6210\u529f<\/li>\n\n\n\n<li>\u4f7f\u7528\u5f3a\u5236\u8def\u7531\uff0c\u5c06\u5bf9\u6570\u636e\u4e00\u81f4\u6027\u8981\u6c42\u9ad8\u7684\u8bf7\u6c42\u5f3a\u5236\u8def\u7531\u5230\u4e3b\u5e93<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>3. \u5206\u5e93\u5206\u8868:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u8bbe\u8ba1:<\/strong> \u6839\u636e\u4e1a\u52a1\u573a\u666f\u548c\u6570\u636e\u91cf\u9009\u62e9\u5408\u9002\u7684\u5206\u5e93\u5206\u8868\u7b56\u7565\uff0c\u4f8b\u5982\uff1a\u6c34\u5e73\u5206\u8868\u3001\u5782\u76f4\u5206\u8868\u3001\u6df7\u5408\u5206\u8868\u7b49\u3002<\/li>\n\n\n\n<li><strong>\u4e2d\u95f4\u4ef6:<\/strong> MyCat\u3001ShardingSphere<\/li>\n\n\n\n<li><strong>\u6570\u636e\u4e00\u81f4\u6027\u3001\u8de8\u5e93\u67e5\u8be2\u3001\u4e8b\u52a1\u5904\u7406:<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528\u5206\u5e03\u5f0f\u4e8b\u52a1\u6846\u67b6\uff0c\u4f8b\u5982\uff1aSeata<\/li>\n\n\n\n<li>\u4f7f\u7528\u5168\u5c40\u552f\u4e00 ID\uff0c\u907f\u514d\u4e0d\u540c\u5206\u5e93\u4e3b\u952e\u51b2\u7a81<\/li>\n\n\n\n<li>\u4f7f\u7528\u6570\u636e\u5e93\u4e2d\u95f4\u4ef6\u63d0\u4f9b\u7684\u8de8\u5e93\u67e5\u8be2\u529f\u80fd<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n\n\n\n<p><strong>4. \u9ad8\u53ef\u7528\u67b6\u6784:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>MMM:<\/strong> \u57fa\u4e8e MySQL \u4e3b\u4ece\u590d\u5236\u548c\u5fc3\u8df3\u673a\u5236\u5b9e\u73b0\u7684\u9ad8\u53ef\u7528\u89e3\u51b3\u65b9\u6848\uff0c\u914d\u7f6e\u7b80\u5355\uff0c\u4f46\u529f\u80fd\u76f8\u5bf9\u7b80\u5355\u3002<\/li>\n\n\n\n<li><strong>MHA:<\/strong> \u57fa\u4e8e MySQL \u4e3b\u4ece\u590d\u5236\u548c GTID \u5b9e\u73b0\u7684\u9ad8\u53ef\u7528\u89e3\u51b3\u65b9\u6848\uff0c\u53ef\u4ee5\u81ea\u52a8\u5207\u6362\u4e3b\u5e93\uff0c\u5e76\u4fdd\u8bc1\u6570\u636e\u4e00\u81f4\u6027\u3002<\/li>\n\n\n\n<li><strong>Galera Cluster:<\/strong> \u57fa\u4e8e MySQL \u96c6\u7fa4\u6280\u672f\u5b9e\u73b0\u7684\u9ad8\u53ef\u7528\u89e3\u51b3\u65b9\u6848\uff0c\u53ef\u4ee5\u5b9e\u73b0\u6570\u636e\u7684\u540c\u6b65\u590d\u5236\uff0c\u5e76\u63d0\u4f9b\u9ad8\u53ef\u7528\u6027\u548c\u6570\u636e\u4e00\u81f4\u6027\u4fdd\u8bc1\u3002<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">\u4e03\u3001 \u95ee\u9898\u6392\u67e5\u4e0e\u6027\u80fd\u8c03\u4f18<\/h2>\n\n\n\n<p><strong>1. \u6392\u67e5 MySQL \u670d\u52a1\u5668 CPU \u4f7f\u7528\u7387\u8fc7\u9ad8:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 top \u547d\u4ee4\u67e5\u770b CPU \u4f7f\u7528\u7387\u6700\u9ad8\u7684\u8fdb\u7a0b<\/li>\n\n\n\n<li>\u4f7f\u7528 SHOW PROCESSLIST \u547d\u4ee4\u67e5\u770b\u6b63\u5728\u6267\u884c\u7684 SQL \u8bed\u53e5<\/li>\n\n\n\n<li>\u4f7f\u7528\u6162\u67e5\u8be2\u65e5\u5fd7\u5b9a\u4f4d\u6267\u884c\u65f6\u95f4\u957f\u7684 SQL \u8bed\u53e5<\/li>\n\n\n\n<li>\u4f7f\u7528 EXPLAIN \u5206\u6790\u6162\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u67e5\u627e\u6027\u80fd\u74f6\u9888<\/li>\n\n\n\n<li>\u68c0\u67e5\u7d22\u5f15\u662f\u5426\u6709\u6548\uff0c\u4f18\u5316 SQL \u8bed\u53e5<\/li>\n\n\n\n<li>\u5347\u7ea7\u786c\u4ef6\u914d\u7f6e\uff0c\u4f8b\u5982\uff1a\u589e\u52a0 CPU \u6838\u5fc3\u6570\u3001\u63d0\u9ad8 CPU \u4e3b\u9891\u7b49<\/li>\n<\/ul>\n\n\n\n<p><strong>2. \u4f18\u5316\u6162 SQL \u67e5\u8be2:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 EXPLAIN \u5206\u6790\u6162\u67e5\u8be2\u8bed\u53e5\u7684\u6267\u884c\u8ba1\u5212\uff0c\u67e5\u627e\u6027\u80fd\u74f6\u9888<\/li>\n\n\n\n<li>\u6839\u636e\u6267\u884c\u8ba1\u5212\uff0c\u4f18\u5316 SQL \u8bed\u53e5\uff0c\u4f8b\u5982\uff1a\u6dfb\u52a0\u7d22\u5f15\u3001\u907f\u514d\u4f7f\u7528 SELECT *\u3001\u4f18\u5316 WHERE \u6761\u4ef6\u7b49<\/li>\n\n\n\n<li>\u8c03\u6574 MySQL \u670d\u52a1\u5668\u53c2\u6570\uff0c\u4f8b\u5982\uff1a\u589e\u5927\u7f13\u51b2\u6c60\u5927\u5c0f\u3001\u4f18\u5316\u6392\u5e8f\u7f13\u5b58\u533a\u5927\u5c0f\u7b49<\/li>\n<\/ul>\n\n\n\n<p><strong>3. \u5904\u7406\u6570\u636e\u5e93\u6b7b\u9501:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u4f7f\u7528 SHOW ENGINE INNODB STATUS \u547d\u4ee4\u67e5\u770b\u6b7b\u9501\u4fe1\u606f<\/li>\n\n\n\n<li>\u5206\u6790\u6b7b\u9501\u539f\u56e0\uff0c\u4f8b\u5982\uff1a\u591a\u4e2a\u4e8b\u52a1\u540c\u65f6\u8bf7\u6c42\u76f8\u540c\u7684\u8d44\u6e90<\/li>\n\n\n\n<li>\u4f18\u5316\u5e94\u7528\u7a0b\u5e8f\u4ee3\u7801\uff0c\u907f\u514d\u51fa\u73b0\u6b7b\u9501<\/li>\n\n\n\n<li>\u8bbe\u7f6e\u5408\u7406\u7684\u9501\u8d85\u65f6\u65f6\u95f4\uff0c\u907f\u514d\u957f\u65f6\u95f4\u7b49\u5f85\u9501\u8d44\u6e90<\/li>\n<\/ul>\n\n\n\n<p>\u5e0c\u671b\u4ee5\u4e0a\u4fe1\u606f\u80fd\u591f\u5e2e\u52a9\u4f60\u5728\u9762\u8bd5\u4e2d\u66f4\u597d\u5730\u5e94\u5bf9 MySQL \u76f8\u5173\u95ee\u9898\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e00\u3001\u7d22\u5f15 1. \u7d22\u5f15\u539f\u7406 &amp; \u4e0d\u540c\u7d22\u5f15\u7c7b\u578b\u9002\u7528\u573a\u666f: 2. \u8054\u5408\u7d22\u5f15\u3001\u8986\u76d6\u7d22\u5f15\u3001\u524d\u7f00\u7d22\u5f15\u6280\u5de7: 3.  &hellip; <\/p>\n<p class=\"link-more\"><a href=\"https:\/\/www.linhw.cn\/index.php\/2024\/08\/14\/mysql%e9%9d%a2%e8%af%95%e9%97%ae%e9%a2%98\/\" class=\"more-link\">\u7ee7\u7eed\u9605\u8bfb<span class=\"screen-reader-text\">\u201cMySQL\u9762\u8bd5\u95ee\u9898\u201d<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5,9],"tags":[],"class_list":["post-53","post","type-post","status-publish","format-standard","hentry","category-php","category-9"],"_links":{"self":[{"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/posts\/53","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/comments?post=53"}],"version-history":[{"count":1,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/posts\/53\/revisions"}],"predecessor-version":[{"id":54,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/posts\/53\/revisions\/54"}],"wp:attachment":[{"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/media?parent=53"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/categories?post=53"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.linhw.cn\/index.php\/wp-json\/wp\/v2\/tags?post=53"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}