{"id":1717,"date":"2020-06-22T17:42:57","date_gmt":"2020-06-22T09:42:57","guid":{"rendered":"http:\/\/39.97.231.10\/?p=1717"},"modified":"2020-06-22T17:42:57","modified_gmt":"2020-06-22T09:42:57","slug":"mysql%e7%b4%a2%e5%bc%95%e5%8e%9f%e7%90%86","status":"publish","type":"post","link":"http:\/\/www.weijing.co\/?p=1717","title":{"rendered":"MySQL\u7d22\u5f15\u539f\u7406"},"content":{"rendered":"
\n
\n
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\n

\u4e00\u3001\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784<\/h3>\n

\u6211\u4eec\u5728\u7ebf\u4e0a\u9047\u5230\u6162\u67e5\u8be2\u7684\u60c5\u51b5\uff0c\u4e00\u822c\u7b2c\u4e00\u4e2a\u60f3\u5230\u7684\u4f18\u5316\u65b9\u5f0f\u5c31\u662f\u7ed9where\u8bed\u53e5\u540e\u7684\u5b57\u6bb5\u52a0\u7d22\u5f15\uff0c\u867d\u7136\u6548\u679c\u662f\u7acb\u7aff\u89c1\u5f71\u7684\uff0c\u4f46\u8fd9\u901a\u5e38\u662f\u61d2\u4eba\u505a\u6cd5\u3002\u4e00\u65b9\u9762\u662f\u56e0\u4e3a\u7d22\u5f15\u5e76\u4e0d\u662f\u90fd\u4f1a\u751f\u6548\uff0c\u53ef\u80fd\u51fa\u73b0\u52a0\u4e86\u7d22\u5f15\uff0c\u67e5\u8be2\u4f9d\u65e7\u6162\u7684\u95ee\u9898\uff0c\u53e6\u4e00\u65b9\u9762\uff0c\u7d22\u5f15\u4f1a\u5360\u7528\u78c1\u76d8\u7a7a\u95f4\u3002
\n\u4f46\u662f\uff0c\u8fd9\u5e76\u4e0d\u59a8\u788d\u6211\u4eec\u5728\u9047\u5230\u6162\u67e5\u8be2\u7684\u65f6\u5019\uff0c\u7b2c\u4e00\u4e2a\u60f3\u5230\u7684\u89e3\u51b3\u65b9\u6848\u5c31\u662f\u52a0\u7d22\u5f15\uff0c\u90a3\u4e48\uff0c\u4e3a\u4ec0\u4e48\u52a0\u4e86\u7d22\u5f15\u4e4b\u540e\uff0c\u5c31\u80fd\u4f18\u5316\u6162\u67e5\u8be2\uff0c\u63d0\u5347\u67e5\u8be2\u901f\u5ea6\uff1f
\n\u5176\u5b9e\uff0c\u7d22\u5f15\u5c31\u662f\u4e00\u79cd\u4f18\u5316\u67e5\u8be2\u7684\u6570\u636e\u7ed3\u6784\uff0cMySQL\u4e2d\u7684\u7d22\u5f15\u5c31\u662f\u7528B+\u6811\u5b9e\u73b0\u7684\u3002\u90a3\u4e48\u4e3a\u4ec0\u4e48MySQL\u4f1a\u9009\u62e9B+\u6811\u4f5c\u4e3a\u7d22\u5f15\u7684\u5b9e\u73b0\u6570\u636e\u7ed3\u6784\u5462\uff1f\u5b83\u548c\u54c8\u5e0c\u8868\u3001\u5b8c\u5168\u5e73\u8861\u4e8c\u53c9\u6811\u3001B\u6811\u6709\u4ec0\u4e48\u4e0d\u540c\uff1f
\n\u5047\u8bbe\uff0c\u6211\u4eec\u73b0\u5728\u6709\u4e0b\u9762\u7684user\u8868\uff1a<\/p>\n

\n
\n
<\/div>\n
<\/div>\n<\/div>\n
<\/div>\n<\/div>\n

\u2460 \u54c8\u5e0c\u8868<\/h4>\n

\u6211\u4eec\u77e5\u9053\uff0chashMap(1.7)\u5e95\u5c42\u5c31\u662f\u901a\u8fc7\u54c8\u5e0c\u8868\u6765\u5b9e\u73b0\u7684\uff0c\u5373\uff0c\u6570\u7ec4+\u94fe\u8868\u7684\u65b9\u5f0f\u3002
\n\u54c8\u5e0c\u8868\u7684\u7f3a\u70b9\u6709\u4e24\u4e2a: \u4e00\u3001hash\u51b2\u7a81\uff0c\u4e8c\u3001\u53ea\u652f\u6301\u7cbe\u786e\u67e5\u8be2\uff0c\u4e0d\u652f\u6301\u8303\u56f4\u67e5\u8be2\uff0c\u5982\u679c\u6211\u4eec\u8981\u67d0\u4e2a\u5e74\u9f84\u5927\u4e8e18\u7684\u7528\u6237\uff0c\u5982\u4e0b\uff1a<\/p>\n

\n
select * from user where name = \\'\u5173\u7fbd\\'; \/\/ \u7cbe\u786e\u67e5\u627e\nselect * from user where name > \\'\u5173\u7fbd\\'; \/\/ \u8303\u56f4\u67e5\u627e\n<\/pre>\n<\/div>\n
\u8fd9\u79cd\u60c5\u51b5\u54c8\u5e0c\u8868\u5e76\u4e0d\u80fd\u5b9e\u73b0\uff0c\u6240\u4ee5\uff0c\u54c8\u5e0c\u8868\u4e0d\u9002\u5408\u505aMySQL\u7684\u7d22\u5f15\u6570\u636e\u7ed3\u6784\u3002<\/p>\n
\u2461\u5b8c\u5168\u5e73\u8861\u4e8c\u53c9\u6811<\/h4>\n
\n
\n
<\/div>\n
<\/div>\n<\/div>\n<\/div>\n
\u5e73\u8861\u4e8c\u53c9\u6811\u7684\u6bcf\u4e2a\u8282\u70b9\u90fd\u5305\u542b\u4e0b\u9762\u56db\u90e8\u5206\u4fe1\u606f\uff1a<\/p>\n
    \n
  1. \u5de6\u6307\u9488\uff0c\u6307\u5411\u5de6\u5b50\u6811<\/li>\n
  2. \u952e\u503c<\/li>\n
  3. \u952e\u503c\u6240\u5bf9\u5e94\u7684\u6570\u636e\u5b58\u50a8\u5730\u5740<\/li>\n
  4. \u53f3\u6307\u9488\uff0c\u6307\u5411\u53f3\u5b50\u6811<\/li>\n<\/ol>\n
    \u53e6\u5916\uff0c\u4e8c\u53c9\u6811\u662f\u6709\u5e8f\u7684\uff0c\u7b80\u800c\u8a00\u4e4b\uff0c\u5c31\u662f\u5de6\u8282\u70b9\u5c0f\u4e8e\u53f3\u8282\u70b9\uff0c\u6240\u4ee5\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\u662f\u652f\u6301\u8303\u56f4\u67e5\u627e\u7684\uff0c\u4f46\u662f\uff0c\u5728\u7cbe\u786e\u67e5\u627e\u7684\u65f6\u5019\uff0c\u4f1a\u6d89\u53ca\u5230\u591a\u6b21\uff0c\u6bd4\u5982\uff0c\u67e5\u5218\u5907\uff0c\u9700\u8981\u67e5\u8be2\u4e09\u6b21\u624d\u80fd\u627e\u5230\uff0c\u6bd4\u54c8\u5e0c\u8868\u7684\u7cbe\u786e\u67e5\u627e\u8981\u6162\u3002<\/p>\n
    \u2462 B\u6811<\/h4>\n
    \n
    \n
    <\/div>\n
    <\/div>\n<\/div>\n<\/div>\n
    \u53ef\u4ee5\u770b\u5230\uff0cB\u6811\u5728\u5c42\u7ea7\u4e0a\u6bd4\u5e73\u8861\u4e8c\u53c9\u6811\u8981\u5c11\u4e00\u5c42\uff0c\u5373\u5c11\u4e00\u6b21\u78c1\u76d8IO\uff0c\u539f\u56e0\u5728\u4e8e\uff0cB\u6811\u4e2d\u7684\u4e00\u4e2a\u8282\u70b9\u53ef\u4ee5\u5b58\u50a8\u591a\u4e2a\u5143\u7d20\u3002<\/p>\n
    \u2463 B+\u6811<\/h4>\n
    \n
    \n
    <\/div>\n
    <\/div>\n<\/div>\n
    <\/div>\n
    <\/div>\n
    B+\u6811\u7684\u53f6\u5b50\u8282\u70b9\u548cB\u6811\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u5197\u4f59\u4e86\u4e00\u5206\u975e\u53f6\u5b50\u8282\u70b9\u7684\u6570\u636e<\/div>\n<\/div>\n
    B+\u6811\u6bd4B\u6811\u8981\u80d6\u4e00\u4e9b\uff0c\u539f\u56e0\u5728\u4e8eB+\u6811\u4e2d\u7684\u975e\u53f6\u5b50\u8282\u70b9\u4f1a\u5197\u4f59\u4e00\u5206\u5728\u53f6\u5b50\u8282\u70b9\u4e2d\uff0c\u5e76\u4e14\u53f6\u5b50\u8282\u70b9\u4e4b\u95f4\u7528\u6307\u9488\u76f8\u8fde\u3002
    \n\u7efc\u4e0a\uff0c\u6211\u4eec\u53ef\u4ee5\u770b\u51fa\uff0c\u6709\u4e09\u79cd\u6570\u636e\u7ed3\u6784\u662f\u9002\u5408\u505aMySQL\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u7684\uff0c\u5e73\u8861\u4e8c\u53c9\u6811\u3001B\u6811\u3001B+\u6811\u3002\u8fd9\u4e09\u79cd\u6570\u636e\u7ed3\u6784\u90fd\u652f\u6301\u7cbe\u786e\u67e5\u627e\u548c\u8303\u56f4\u67e5\u627e\uff0c\u90a3\u4e48\u4e3a\u4ec0\u4e48MySQL\u5374\u9009\u4e2d\u4e86B+\u6811\u4f5c\u4e3a\u7d22\u5f15\u7684\u6570\u636e\u7ed3\u6784\u5462\uff1f
    \n\u5176\u5b9e\uff0c\u7d22\u5f15\u4e5f\u662f\u5b58\u50a8\u5143\u7d20\u7684\uff0c\u5f53\u6211\u4eec\u7684\u4e00\u4e2a\u8868\u4e2d\u7684\u6570\u636e\u8d8a\u6765\u8d8a\u591a\u65f6\uff0c\u5bf9\u5e94\u7684\u7d22\u5f15\u6587\u4ef6\u4e5f\u4f1a\u8d8a\u6765\u8d8a\u5927\uff0c\u8fd9\u6837\u5c31\u4e0d\u80fd\u628a\u5168\u90e8\u7684\u7d22\u5f15\u6587\u4ef6\u653e\u5728\u5185\u5b58\uff0c\u4e0d\u5f97\u4e0d\u5c06\u7d22\u5f15\u6587\u4ef6\u5b58\u50a8\u5728\u78c1\u76d8\u4e0a\uff0c\u90a3\u4e48\u9009\u7528\u54ea\u79cd\u6570\u636e\u7ed3\u6784\uff0c\u80fd\u591f\u63d0\u9ad8\u78c1\u76d8\u7684IO\u6548\u7387\uff0c\u5c31\u6210\u4e86\u53c2\u8003\u9879\u3002
    \n\u5982\u679c\u4f7f\u7528\u5b8c\u5168\u5e73\u8861\u4e8c\u53c9\u6811\u6765\u67e5\u8be2\u201c\u5f20\u98de\u201d\uff0c\u5219\u9700\u8981\u56db\u6b21IO\uff0c\u800c\u4f7f\u7528B\u6811\u7684\u8bdd\uff0c\u53ea\u8981\u4e09\u6b21\u5c31\u53ef\u4ee5\u4e86\uff0c\u63d0\u5347\u4e86\u78c1\u76d8\uff29\uff2f\u6548\u7387\uff0c\u800c\uff22+\u6811\u548cB\u6811\u7684\u975e\u53f6\u5b50\u8282\u70b9\u662f\u4e00\u6837\u7684\uff0c\u53ea\u4e0d\u8fc7\u662f\u53f6\u5b50\u8282\u70b9\u5197\u4f59\u4e86\u4e00\u4efd\u975e\u53f6\u5b50\u8282\u70b9\u7684\u6570\u636e\u3002\u6240\u4ee5\uff0c\u5728\u7cbe\u786e\u67e5\u627e\u4e0a\uff0cB\u6811\u548cB+\u6811\u662f\u4e00\u6837\u7684\uff0c\u800cB+\u6811\u5728\u8303\u56f4\u67e5\u627e\u4e0a\u4f18\u4e8eB\u6811\u3002<\/p>\n
    \u4e8c\u3001 B+\u6811\u7684\u8282\u70b9\u5230\u5e95\u591a\u5927\u5408\u9002<\/h3>\n
    B+\u6811\u7684\u4e00\u4e2a\u8282\u70b9\u4e3a\u4e00\u9875\u6216\u8005\u4e00\u9875\u7684\u6574\u6570\u500d\u6700\u4e3a\u5408\u9002\uff0c\u56e0\u4e3a\u8bfb\u53d6\u8fd9\u4e2a\u8282\u70b9\u7684\u65f6\u5019\uff0c\u662f\u6309\u7167\u4e00\u9875\u6765\u8bfb\u53d6\u7684\uff0c\u5927\u4e8e\u6216\u5c0f\u4e8e\u4e00\u9875\uff0c\u4f1a\u9020\u6210\u8d44\u6e90\u6d6a\u8d39\u3002
    \n\u5728MySQL\u7684Innodb\u5f15\u64ce\u4e2d\uff0c\u4e00\u9875\u7684\u9ed8\u8ba4\u5927\u5c0f\u662f16K\uff08\u5982\u679c\u64cd\u4f5c\u7cfb\u7edf\u7684\u4e00\u9875\u5927\u5c0f\u662f4K\uff0c\u90a3\u4e48Mysql\u4e2d\u4e00\u9875=\u64cd\u4f5c\u7cfb\u7edf\u4e2d4\u9875\uff09\uff0c\u53ef\u4ee5\u4f7f\u7528\u5982\u4e0b\u547d\u4ee4\u67e5\u770b:<\/p>\n
    \n
    show global status like \\'Innodbpagesize\\';<\/pre>\n<\/div>\n<\/article>\n","protected":false},"excerpt":{"rendered":"
    \u5728\u4e92\u8054\u7f51\u884c\u4e1a\uff0c\u5e38\u7528\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u662fMySQL\uff0c\u6240\u4ee5\u5728\u62db\u8058\u8fc7\u7a0b\u4e2d\uff0c\u9762\u8bd5\u5b98\u4e00\u822c\u90fd\u4f1a\u95ee\u4e9b\u5173\u4e8eMySQL\u7684\u95ee\u9898\uff0c\u6bd4\u5982M …<\/p>\n
      MySQL\u7d22\u5f15\u539f\u7406<\/span> \u67e5\u770b\u5168\u6587 »<\/a><\/p>\n","protected":false},"author":4,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"default","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":""},"categories":[106,126],"tags":[],"uagb_featured_image_src":{"full":false,"thumbnail":false,"medium":false,"medium_large":false,"large":false,"1536x1536":false,"2048x2048":false,"mailpoet_newsletter_max":false,"woocommerce_thumbnail":false,"woocommerce_single":false,"woocommerce_gallery_thumbnail":false,"shop_catalog":false,"shop_single":false,"shop_thumbnail":false},"uagb_author_info":{"display_name":"weijing","author_link":"http:\/\/www.weijing.co\/?author=4"},"uagb_comment_info":0,"uagb_excerpt":"\u5728\u4e92\u8054\u7f51\u884c\u4e1a\uff0c\u5e38\u7528\u7684\u5173\u7cfb\u578b\u6570\u636e\u5e93\u662fMySQL\uff0c\u6240\u4ee5\u5728\u62db\u8058\u8fc7\u7a0b\u4e2d\uff0c\u9762\u8bd5\u5b98\u4e00\u822c\u90fd\u4f1a\u95ee\u4e9b\u5173\u4e8eMySQL\u7684\u95ee\u9898\uff0c\u6bd4\u5982M…","_links":{"self":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1717"}],"collection":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/users\/4"}],"replies":[{"embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1717"}],"version-history":[{"count":0,"href":"http:\/\/www.weijing.co\/index.php?rest_route=\/wp\/v2\/posts\/1717\/revisions"}],"wp:attachment":[{"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1717"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1717"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.weijing.co\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1717"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}