{"id":378,"date":"2024-11-26T16:35:23","date_gmt":"2024-11-26T08:35:23","guid":{"rendered":"http:\/\/blog.kijk.top\/?p=378"},"modified":"2024-11-26T16:36:28","modified_gmt":"2024-11-26T08:36:28","slug":"mysql%e5%88%86%e9%a1%b5offset%e8%bf%87%e5%a4%a7%e6%80%a7%e8%83%bd%e9%97%ae%e9%a2%98%e4%b8%8e%e4%bc%98%e5%8c%96","status":"publish","type":"post","link":"http:\/\/blog.kijk.top\/?p=378","title":{"rendered":"MySQL\u5206\u9875offset\u8fc7\u5927\u6027\u80fd\u95ee\u9898\u4e0e\u4f18\u5316"},"content":{"rendered":"\n<p>\u8f6c\u8f7d\u4e8e\uff1a<a href=\"https:\/\/daemoncoder.com\/a\/MySQL%E5%88%86%E9%A1%B5offset%E8%BF%87%E5%A4%A7%E6%80%A7%E8%83%BD%E9%97%AE%E9%A2%98%E4%B8%8E%E4%BC%98%E5%8C%96\/4d513d3d\" target=\"_blank\" rel=\"noreferrer noopener\">https:\/\/daemoncoder.com\/a\/MySQL%E5%88%86%E9%A1%B5offset%E8%BF%87%E5%A4%A7%E6%80%A7%E8%83%BD%E9%97%AE%E9%A2%98%E4%B8%8E%E4%BC%98%E5%8C%96\/4d513d3d<\/a><\/p>\n\n\n\n<h3>\u80cc\u666f<\/h3>\n\n\n\n<p>\u6700\u8fd1\u88abDBA\u62a5\u4e86\u4e00\u4e2a\u6162\u67e5\u8be2\uff0c\u4e00\u6761sql\u8981\u6267\u884c\u51e0\u79d2\u751a\u81f3\u5341\u51e0\u79d2\uff0c\u76f4\u63a5\u5bfc\u81f4cpu idle\u62a5\u8b66\uff0c\u5e78\u597d\u7ebf\u4e0a\u6ca1\u6709\u51fa\u4e8b\u6545\u3002\u8fd9\u91cc\u8bb0\u5f55\u4e0b\u95ee\u9898\u7684\u8be6\u7ec6\u4fe1\u606f\u548c\u89e3\u51b3\u65b9\u6848\u3002<\/p>\n\n\n\n<p>Mysql\u8868\u7ed3\u6784\u5927\u6982\u53ef\u4ee5\u7b80\u5316\u4e3a\u8fd9\u6837\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>CREATE TABLE `t` (\n\n`a` int(11) NOT NULL,\n\n`b` int(11) DEFAULT NULL,\n\n`c` int(11) DEFAULT NULL,\n\nPRIMARY KEY (`a`),\n\nKEY `idx_c` (`c`)\n\n) ENGINE=InnoDB<\/code><\/pre>\n\n\n\n<p>a\u3001b\u3001c\u4e09\u5217\uff0ca\u5217\u662f\u4e3b\u952e\uff0cc\u5217\u4e0a\u6709\u7d22\u5f15\uff08\u5f53\u7136\u7ebf\u4e0a\u771f\u5b9e\u7684\u8868\u7ed3\u6784\u6bd4\u8fd9\u4e2a\u66f4\u590d\u6742\uff0c\u6b64\u5904\u53ea\u662f\u4e3a\u4e86\u8bf4\u660e\u95ee\u9898\uff0c\u7565\u53bb\u4e0d\u76f8\u5173\u5b57\u6bb5\uff09\u3002<\/p>\n\n\n\n<p>\u8fd9\u4e2a\u8868\u7684\u6570\u636e\u91cf\u5df2\u7ecf\u8fbe\u5230\u5343\u4e07\u7ea7\u522b\u3002<\/p>\n\n\n\n<h3>\u95ee\u9898<\/h3>\n\n\n\n<p>\u5bfc\u81f4\u6162\u67e5\u8be2\u7684sql\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT b FROM t WHERE c&lt;1000 LIMIT 2000000, 500<\/code><\/pre>\n\n\n\n<p>\u53ef\u4ee5\u770b\u5230\u8fd9\u4e2a\u4e00\u4e2a\u5206\u9875\u67e5\u8be2\uff0c\u4ece\u4f4d\u7f6e2000000\u5904\u5f00\u59cb\uff0c\u53d6500\u6761\u6570\u636e\uff0c\u95ee\u9898\u7684\u539f\u56e0\u6b63\u662f\u8fd9\u4e2a\u8fc7\u5927\u7684\u5206\u9875\u8d77\u70b9\u5bfc\u81f4\u3002mysql\u5206\u9875\u67e5\u8be2\u4f1a\u5e76\u4e0d\u662f\u76f4\u63a5\u8df3\u8fc7\u524d2000000\u518d\u53d6\u51fa500\u6761\u6570\u636e\uff0c\u800c\u662f\u628a\u524d2000000\u6761\u548c\u540e\u9762\u7684500\u6761\u90fd\u53d6\u51fa\u6765\uff0c\u518d\u628a\u524d2000000\u6761\u629b\u5f03\uff0c\u8fd9\u6837\u7684\u8bdd\uff0c\u4e0a\u9762\u7684\u6162\u67e5\u8be2\u76f8\u5f53\u4e8e\u4ece\u8868\u4e2d\u53d62000500\u6761\u6570\u636e\uff0c\u8fd9\u4e48\u5927\u7684\u6570\u636e\u91cf\u5fc5\u7136\u4f1a\u6162\u3002<\/p>\n\n\n\n<h3>\u89e3\u51b3\u65b9\u6848<\/h3>\n\n\n\n<p>sql\u4fee\u6539\u4e3a\uff1a<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>SELECT b FROM (SELECT a FROM t WHERE c&lt;1000 LIMIT 2000000, 500) ta INNER JOIN t tb ON ta.a = tb.a<\/code><\/pre>\n\n\n\n<p>\u8fd9\u79cd\u65b9\u5f0f\u5148\u7528\u4e00\u4e2a\u5b50\u67e5\u8be2\u8868\u7684\u4e3b\u952e\uff08\u8fd8\u662f\u548c\u539f\u6765\u4e00\u6837\u5e26\u6709\u8fc7\u5927\u5206\u9875\uff09\uff0c\u7ed3\u679c\u505a\u4e3a\u4e00\u4e2a\u4e34\u65f6\u8868\uff0c\u518d\u548c\u539f\u6765\u7684t\u8868JOIN\uff0c\u67e5\u51fa\u9700\u8981\u7684\u5b57\u6bb5\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u8fd9\u79cd\u65b9\u5f0f\u4e0d\u4ed4\u7ec6\u770b\u7684\u8bdd\uff0c\u4e5f\u662f\u8981\u67e5\u51fa2000500\u6761\u6570\u636e\uff0c\u56e0\u4e3a\u5b50\u4efb\u52a1\u7684where\u548climit\u8bbe\u7f6e\u548c\u539f\u6765\u4e00\u6837\uff0c\u5173\u952e\u5c31\u5728\u4e8e\u5b50\u4efb\u52a1SELECT\u51fa\u6765\u7684\u662fa\u5b57\u6bb5\uff08t\u8868\u7684\u4e3b\u952e\uff09\uff0c\u800c\u4e0d\u662f\u50cf\u539f\u6765\u76f4\u63a5b\u5b57\u6bb5\uff0c\u8fd9\u6837\u67e5\u51fa500\u6761\u6570\u636e\u540e\u518d\u548c\u539f\u6709\u7684\u8868join\u518d\u67e5\u51fa\u9700\u8981\u7684\u6570\u636e\u5b57\u6bb5b\uff0c\u4e0b\u9762\u8be6\u7ec6\u5206\u6790\u4e0b\u8fd9\u4e2a\u7ec6\u8282\u5e26\u6765\u7684\u6027\u80fd\u5dee\u5f02\u3002<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u57fa\u7840\u77e5\u8bc6\uff1ainnodb\u7684\u7d22\u5f15\u5206\u4e3a\u805a\u96c6\u7d22\u5f15\u548c\u8f85\u52a9\u7d22\u5f15\uff0cinnodb\u662f\u7528\u805a\u96c6\u7d22\u5f15\u7ec4\u7ec7\u6570\u636e\u7684\uff0c\u8f85\u52a9\u7d22\u5f15\u4e0a\u53ea\u5b58\u4e86\u4e00\u4e2a\u4e3b\u952e\uff0c\u6309\u8f85\u52a9\u7d22\u5f15\u67e5\u8be2\u6570\u636e\u65f6\uff0c\u5148\u4ece\u8f85\u52a9\u7d22\u5f15\u5bf9\u5e94\u8bb0\u5f55\u7684\u4e3b\u952e\uff0c\u518d\u7528\u4e3b\u952e\u53bb\u805a\u96c6\u7d22\u5f15\u67e5\u5177\u4f53\u7684\u6570\u636e\u5b57\u6bb5\u3002\uff08\u8fd9\u91cc\u4e0d\u8be6\u7ec6\u5206\u6790\u4e24\u4e2a\u79cd\u7d22\u5f15\u7684\u533a\u522b\uff0c\u4e0d\u4e86\u89e3\u53ef\u4ee5\u81ea\u884c\u767e\u5ea6\uff09<\/p>\n\n\n\n<p><\/p>\n\n\n\n<p>\u4e0a\u9762\u7684\u6162sql\u4f1a\u4ece\u8f85\u52a9\u7d22\u4e0a\u67e52000500\u6761\u6570\u636e\uff0c\u5bf9\u4e8e\u6bcf\u4e00\u6761\u6570\u636e\u8fd8\u8981\u4ece\u805a\u96c6\u7d22\u5f15\u4e0a\u67e5\u4e00\u6b21\u3002\u4fee\u6539\u540e\u7684sql\u4f1a\u4ece\u8f85\u52a9\u7d22\u5f15\u4e0a\u67e5\u51fa2000500\u6761\u4e3b\u952e\uff0c\u7531\u4e8e\u8f85\u52a9\u7d22\u5f15\u4e0a\u672c\u8eab\u5c31\u6709\u4e3b\u952e\uff0c\u6240\u4ee5\u8fd92000500\u65e0\u9700\u518d\u53bb\u805a\u96c6\u7d22\u5f15\u67e5\uff0c\u751f\u6210\u4e34\u65f6\u8868\u540e\u518d\u628a\u8fd9500\u6761\u6570\u636e\u53bb\u805a\u96c6\u7d22\u5f15\u67e5\u51fab\u5b57\u6bb5\uff0csql\u4ece\u805a\u96c6\u7d22\u5f15\u4e2d\u67e52000500\u6761\u6570\u636e\u53d8\u6210\u4e86\u53ea\u9700\u8981\u67e5500\u6761\uff0c\u5e76\u4e14b\u5b57\u6bb5\u5728\u771f\u5b9e\u7684\u60c5\u51b5\u5f80\u5f80\u662f\u5927\u91cf\u6570\u636e\u7684\u5b57\u6bb5\uff0c\u56e0\u6b64\u4fee\u6539\u524d\u540e\u7684sql\u6027\u80fd\u5dee\u522b\u5f88\u5927\uff08\u8fd9\u91cc\u6211\u7406\u89e3\u4fee\u6539\u524d\u7684sql\u6309\u8f85\u52a9\u7d22\u5f15\u987a\u5e8f\u67e5\u8be2\u65f6\uff0c\u518d\u53bb\u67e5\u805a\u96c6\u7d22\u5f15\u5c31\u4e0d\u518d\u662f\u987a\u5e8f\u8bfb\u4e86\uff0c\u800c\u662f\u968f\u673a\u7684\u79bb\u6563\u8bfb\uff0c\u4e5f\u662f\u4e00\u90e8\u5206\u6027\u80fd\u5dee\u7684\u539f\u56e0\uff0c\u5177\u4f53\u53ea\u662f\u81ea\u5df1\u7684\u731c\u6d4b\uff0c\u6ca1\u6709\u9a8c\u8bc1\uff09\u3002<\/p>\n\n\n\n<h3>\u4f18\u5316\u6548\u679c<\/h3>\n\n\n\n<p>\u4fee\u6539\u524d\u540e\u7684sql\u8017\u65f6\u4ece\u51e0\u79d2\u964d\u5230\u4e86\u51e0\u5341\u6beb\u79d2\uff08\u8fd9\u4e2a\u5dee\u5f02\u548c\u5b9e\u9645\u60c5\u51b5\u6709\u5173\uff09\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u8f6c\u8f7d\u4e8e\uff1ahttps:\/\/daemoncoder.com\/a\/MySQL%E5%88%86%E9%A1%B5of [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[4],"tags":[],"_links":{"self":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/378"}],"collection":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=378"}],"version-history":[{"count":2,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/378\/revisions"}],"predecessor-version":[{"id":380,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=\/wp\/v2\/posts\/378\/revisions\/380"}],"wp:attachment":[{"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=378"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=378"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/blog.kijk.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=378"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}