{"id":5282,"date":"2024-11-14T11:21:26","date_gmt":"2024-11-14T03:21:26","guid":{"rendered":"https:\/\/fwq.ai\/blog\/5282\/"},"modified":"2024-11-14T11:21:26","modified_gmt":"2024-11-14T03:21:26","slug":"mysql%e8%81%94%e5%90%88%e7%b4%a2%e5%bc%95%e6%80%8e%e4%b9%88%e5%88%9b%e5%bb%ba","status":"publish","type":"post","link":"https:\/\/fwq.ai\/blog\/5282\/","title":{"rendered":"mysql\u8054\u5408\u7d22\u5f15\u600e\u4e48\u521b\u5efa"},"content":{"rendered":"<blockquote><p>\n  \u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\u7684\u6280\u672f\uff0c\u7528\u4e8e\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u5176\u6b65\u9aa4\u5305\u62ec\uff1a\u786e\u5b9a\u5e76\u9009\u62e9\u7ecf\u5e38\u4e00\u8d77\u67e5\u8be2\u7684\u5217\u3002\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u5efa\u7acb\u7d22\u5f15\uff1acreate index index_name on table_name (column1, column2, &#8230;)\u3002\u597d\u5904\u5305\u62ec\uff1a\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\u3001\u51cf\u5c11\u78c1\u76d8 i\/o\u3001\u4f18\u5316\u6392\u5e8f\u548c\u5206\u7ec4\u3002\u6ce8\u610f\u4e8b\u9879\uff1a\u7d22\u5f15\u4e2d\u7684\u5217\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u7d22\u5f15\u5927\u5c0f\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u6bcf\u6b21\u66f4\u65b0\u7d22\u5f15\u5217\u65f6\u90fd\u9700\u8981\u7ef4\u62a4\u7d22\u5f15\u3002\n<\/p><\/blockquote>\n<p><img decoding=\"async\" src=\"https:\/\/img.php.cn\/upload\/article\/202405\/26\/2024052618214773965.jpg\" class=\"aligncenter\" title=\"mysql\u8054\u5408\u7d22\u5f15\u600e\u4e48\u521b\u5efa\u63d2\u56fe\" alt=\"mysql\u8054\u5408\u7d22\u5f15\u600e\u4e48\u521b\u5efa\u63d2\u56fe\" \/><\/p>\n<p><strong>\u5982\u4f55\u521b\u5efa MySQL \u8054\u5408\u7d22\u5f15<\/strong><\/p>\n<p><strong>\u7b80\u4ecb<\/strong><br \/>\u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\u7684\u6280\u672f\uff0c\u4ee5\u63d0\u9ad8\u57fa\u4e8e\u8fd9\u4e9b\u5217\u8fdb\u884c\u67e5\u8be2\u7684\u6027\u80fd\u3002<\/p>\n<p><strong>\u6b65\u9aa4<\/strong><\/p>\n<p>\u521b\u5efa\u8054\u5408\u7d22\u5f15\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a<\/p>\n<ol>\n<li> <strong>\u786e\u5b9a\u8981\u5305\u542b\u7684\u5217\uff1a<\/strong>\u9009\u62e9\u7ecf\u5e38\u4e00\u8d77\u67e5\u8be2\u7684\u5217\u3002<\/li>\n<li> <strong>\u5efa\u7acb\u7d22\u5f15\uff1a<\/strong>\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a<\/li>\n<\/ol>\n<pre>CREATE INDEX index_name ON table_name (column1, column2, ...);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p>\u793a\u4f8b\uff1a<\/p>\n<pre>CREATE INDEX idx_name_and_email ON users (name, email);<\/pre>\n<p> \u767b\u5f55\u540e\u590d\u5236 <\/p>\n<p><strong>\u597d\u5904<\/strong><\/p>\n<p>\u521b\u5efa\u8054\u5408\u7d22\u5f15\u7684\u597d\u5904\u5305\u62ec\uff1a<\/p>\n<ul>\n<li> <strong>\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\uff1a<\/strong>\u901a\u8fc7\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u66f4\u6709\u6548\u5730\u67e5\u627e\u6570\u636e\u3002<\/li>\n<li> <strong>\u51cf\u5c11\u78c1\u76d8 I\/O\uff1a<\/strong>\u5c06\u591a\u4e2a\u7d22\u5f15\u5408\u5e76\u4e3a\u4e00\u4e2a\u53ef\u4ee5\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684\u8bfb\u8bbf\u95ee\u6b21\u6570\u3002<\/li>\n<li> <strong>\u4f18\u5316\u6392\u5e8f\u548c\u5206\u7ec4\uff1a<\/strong>\u8054\u5408\u7d22\u5f15\u53ef\u7528\u4e8e\u4f18\u5316\u9700\u8981\u5bf9\u591a\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f\u6216\u5206\u7ec4\u7684\u67e5\u8be2\u3002<\/li>\n<\/ul>\n<p><strong>\u6ce8\u610f\u4e8b\u9879<\/strong><\/p>\n<p>\u4f7f\u7528\u8054\u5408\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u4e8b\u9879\uff1a<\/p>\n<ul>\n<li> <strong>\u7d22\u5f15\u987a\u5e8f\uff1a<\/strong>\u7d22\u5f15\u4e2d\u7684\u5217\u987a\u5e8f\u5f88\u91cd\u8981\u3002\u66f4\u9891\u7e41\u67e5\u8be2\u7684\u5217\u5e94\u653e\u5728\u7d22\u5f15\u7684\u5f00\u5934\u3002<\/li>\n<li> <strong>\u7d22\u5f15\u5927\u5c0f\uff1a<\/strong>\u8054\u5408\u7d22\u5f15\u7684\u5927\u5c0f\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5e94\u8c28\u614e\u9009\u62e9\u5217\u3002<\/li>\n<li> <strong>\u7ef4\u62a4\u5f00\u9500\uff1a<\/strong>\u6bcf\u6b21\u66f4\u65b0\u6d89\u53ca\u7d22\u5f15\u7684\u5217\u65f6\uff0c\u7d22\u5f15\u90fd\u9700\u8981\u7ef4\u62a4\uff0c\u8fd9\u5bf9\u6027\u80fd\u6709\u4e00\u5b9a\u5f71\u54cd\u3002<\/li>\n<\/ul>\n<p><strong>\u7ed3\u8bba<\/strong><\/p>\n<p>\u521b\u5efa\u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u63d0\u9ad8 MySQL \u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u6709\u6548\u6280\u672f\uff0c\u4f46\u9700\u8981\u8003\u8651\u5217\u9009\u62e9\u3001\u7d22\u5f15\u987a\u5e8f\u548c\u7ef4\u62a4\u5f00\u9500\u7b49\u56e0\u7d20\u3002<\/p>\n<p>\u4ee5\u4e0a\u5c31\u662f\u8054\u5408\u7d22\u5f15\u600e\u4e48\u521b\u5efa\u7684\u8be6\u7ec6\u5185\u5bb9\uff0c\u66f4\u591a\u8bf7\u5173\u6ce8\u7c73\u4e91\u7f51\u5176\u5b83\u76f8\u5173\u6587\u7ae0\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\u7684\u6280\u672f\uff0c\u7528\u4e8e\u63d0\u9ad8\u67e5\u8be2\u6027\u80fd\uff0c\u5176\u6b65\u9aa4\u5305\u62ec\uff1a\u786e\u5b9a\u5e76\u9009\u62e9\u7ecf\u5e38\u4e00\u8d77\u67e5\u8be2\u7684\u5217\u3002\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\u5efa\u7acb\u7d22\u5f15\uff1acreate index index_name on table_name (column1, column2, &#8230;)\u3002\u597d\u5904\u5305\u62ec\uff1a\u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\u3001\u51cf\u5c11\u78c1\u76d8 i\/o\u3001\u4f18\u5316\u6392\u5e8f\u548c\u5206\u7ec4\u3002\u6ce8\u610f\u4e8b\u9879\uff1a\u7d22\u5f15\u4e2d\u7684\u5217\u987a\u5e8f\u5f88\u91cd\u8981\uff0c\u7d22\u5f15\u5927\u5c0f\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u6bcf\u6b21\u66f4\u65b0\u7d22\u5f15\u5217\u65f6\u90fd\u9700\u8981\u7ef4\u62a4\u7d22\u5f15\u3002 \u5982\u4f55\u521b\u5efa MySQL \u8054\u5408\u7d22\u5f15 \u7b80\u4ecb\u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\u7684\u6280\u672f\uff0c\u4ee5\u63d0\u9ad8\u57fa\u4e8e\u8fd9\u4e9b\u5217\u8fdb\u884c\u67e5\u8be2\u7684\u6027\u80fd\u3002 \u6b65\u9aa4 \u521b\u5efa\u8054\u5408\u7d22\u5f15\u7684\u6b65\u9aa4\u5982\u4e0b\uff1a \u786e\u5b9a\u8981\u5305\u542b\u7684\u5217\uff1a\u9009\u62e9\u7ecf\u5e38\u4e00\u8d77\u67e5\u8be2\u7684\u5217\u3002 \u5efa\u7acb\u7d22\u5f15\uff1a\u4f7f\u7528\u4ee5\u4e0b\u8bed\u6cd5\uff1a CREATE INDEX index_name ON table_name (column1, column2, &#8230;); \u767b\u5f55\u540e\u590d\u5236 \u793a\u4f8b\uff1a CREATE INDEX idx_name_and_email ON users (name, email); \u767b\u5f55\u540e\u590d\u5236 \u597d\u5904 \u521b\u5efa\u8054\u5408\u7d22\u5f15\u7684\u597d\u5904\u5305\u62ec\uff1a \u66f4\u5feb\u7684\u67e5\u8be2\u901f\u5ea6\uff1a\u901a\u8fc7\u5c06\u591a\u4e2a\u5217\u7ec4\u5408\u6210\u4e00\u4e2a\u7d22\u5f15\uff0cMySQL \u53ef\u4ee5\u66f4\u6709\u6548\u5730\u67e5\u627e\u6570\u636e\u3002 \u51cf\u5c11\u78c1\u76d8 I\/O\uff1a\u5c06\u591a\u4e2a\u7d22\u5f15\u5408\u5e76\u4e3a\u4e00\u4e2a\u53ef\u4ee5\u51cf\u5c11\u5bf9\u78c1\u76d8\u7684\u8bfb\u8bbf\u95ee\u6b21\u6570\u3002 \u4f18\u5316\u6392\u5e8f\u548c\u5206\u7ec4\uff1a\u8054\u5408\u7d22\u5f15\u53ef\u7528\u4e8e\u4f18\u5316\u9700\u8981\u5bf9\u591a\u4e2a\u5217\u8fdb\u884c\u6392\u5e8f\u6216\u5206\u7ec4\u7684\u67e5\u8be2\u3002 \u6ce8\u610f\u4e8b\u9879 \u4f7f\u7528\u8054\u5408\u7d22\u5f15\u65f6\u9700\u8981\u6ce8\u610f\u4ee5\u4e0b\u4e8b\u9879\uff1a \u7d22\u5f15\u987a\u5e8f\uff1a\u7d22\u5f15\u4e2d\u7684\u5217\u987a\u5e8f\u5f88\u91cd\u8981\u3002\u66f4\u9891\u7e41\u67e5\u8be2\u7684\u5217\u5e94\u653e\u5728\u7d22\u5f15\u7684\u5f00\u5934\u3002 \u7d22\u5f15\u5927\u5c0f\uff1a\u8054\u5408\u7d22\u5f15\u7684\u5927\u5c0f\u4f1a\u5f71\u54cd\u6027\u80fd\uff0c\u5e94\u8c28\u614e\u9009\u62e9\u5217\u3002 \u7ef4\u62a4\u5f00\u9500\uff1a\u6bcf\u6b21\u66f4\u65b0\u6d89\u53ca\u7d22\u5f15\u7684\u5217\u65f6\uff0c\u7d22\u5f15\u90fd\u9700\u8981\u7ef4\u62a4\uff0c\u8fd9\u5bf9\u6027\u80fd\u6709\u4e00\u5b9a\u5f71\u54cd\u3002 \u7ed3\u8bba \u521b\u5efa\u8054\u5408\u7d22\u5f15\u662f\u4e00\u79cd\u63d0\u9ad8 MySQL \u6570\u636e\u5e93\u67e5\u8be2\u6027\u80fd\u7684\u6709\u6548\u6280\u672f\uff0c\u4f46\u9700\u8981\u8003\u8651\u5217\u9009\u62e9\u3001\u7d22\u5f15\u987a\u5e8f\u548c\u7ef4\u62a4\u5f00\u9500\u7b49\u56e0\u7d20\u3002 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