{"id":153121,"date":"2024-11-02T04:48:19","date_gmt":"2024-11-01T20:48:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153121\/"},"modified":"2024-11-02T04:48:20","modified_gmt":"2024-11-01T20:48:20","slug":"%e5%be%9e-0-742-%e7%a7%92%e5%88%b0-0-006-%e7%a7%92%ef%bc%8cmysql-%e7%99%be%e8%90%ac%e6%95%b8%e6%93%9a%e6%b7%b1%e5%88%86%e9%a0%81%e5%84%aa%e5%8c%96%e5%af%a6%e6%88%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153121\/","title":{"rendered":"\u5f9e 0.742 \u79d2\u5230 0.006 \u79d2\uff0cMySQL \u767e\u842c\u6578\u64da\u6df1\u5206\u9801\u512a\u5316\u5be6\u6230"},"content":{"rendered":"

\u5f9e 0.742 \u79d2\u5230 0.006 \u79d2\uff0cMySQL \u767e\u842c\u6578\u64da\u6df1\u5206\u9801\u512a\u5316\u5be6\u6230<\/h1>\n

\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u61c9\u7528\u7a0b\u5e8f\u7684\u6574\u9ad4\u6548\u7387\u81f3\u95dc\u91cd\u8981\u3002\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u5982\u4f55\u6709\u6548\u5730\u9032\u884c\u6df1\u5206\u9801\u67e5\u8a62\u6210\u70ba\u4e86\u958b\u767c\u8005\u9762\u81e8\u7684\u4e00\u5927\u6311\u6230\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u5c07 MySQL \u5728\u8655\u7406\u767e\u842c\u6578\u64da\u6642\u7684\u67e5\u8a62\u6642\u9593\u5f9e 0.742 \u79d2\u512a\u5316\u81f3 0.006 \u79d2\uff0c\u4e26\u5206\u4eab\u4e00\u4e9b\u5be6\u7528\u7684\u512a\u5316\u6280\u5de7\u3002<\/p>\n

\u6df1\u5206\u9801\u67e5\u8a62\u7684\u6311\u6230<\/h2>\n

\u6df1\u5206\u9801\u67e5\u8a62\u662f\u6307\u5728\u6578\u64da\u8868\u4e2d\u67e5\u8a62\u7279\u5b9a\u9801\u78bc\u7684\u6578\u64da\uff0c\u901a\u5e38\u4f7f\u7528 LIMIT \u548c OFFSET \u4f86\u5be6\u73fe\u3002\u4f8b\u5982\uff0c\u7576\u6211\u5011\u9700\u8981\u67e5\u8a62\u7b2c 1000 \u9801\u7684\u6578\u64da\u6642\uff0cSQL \u8a9e\u53e5\u53ef\u80fd\u5982\u4e0b\uff1a<\/p>\n

SELECT * FROM table_name LIMIT 10 OFFSET 9990;<\/code><\/pre>\n
\u96a8\u8457\u9801\u78bc\u7684\u589e\u52a0\uff0cOFFSET \u7684\u503c\u4e5f\u6703\u96a8\u4e4b\u589e\u5927\uff0c\u9019\u6703\u5c0e\u81f4 MySQL \u5728\u67e5\u8a62\u6642\u9700\u8981\u6383\u63cf\u8d8a\u4f86\u8d8a\u591a\u7684\u6578\u64da\u884c\uff0c\u5f9e\u800c\u5f71\u97ff\u6027\u80fd\u3002\u9019\u5c31\u662f\u70ba\u4ec0\u9ebc\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\uff0c\u6df1\u5206\u9801\u67e5\u8a62\u7684\u6027\u80fd\u6703\u986f\u8457\u4e0b\u964d\u3002<\/p>\n
\u512a\u5316\u7b56\u7565<\/h2>\n
1. \u4f7f\u7528\u7d22\u5f15<\/h3>\n
\u78ba\u4fdd\u5728\u67e5\u8a62\u7684\u5217\u4e0a\u5efa\u7acb\u9069\u7576\u7684\u7d22\u5f15\u662f\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u7684\u7b2c\u4e00\u6b65\u3002\u5c0d\u65bc\u6df1\u5206\u9801\u67e5\u8a62\uff0c\u901a\u5e38\u9700\u8981\u5728\u6392\u5e8f\u7684\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\u3002\u4f8b\u5982\uff0c\u5982\u679c\u6211\u5011\u7684\u67e5\u8a62\u662f\u57fa\u65bc\u6642\u9593\u6233\u6392\u5e8f\u7684\uff0c\u5247\u61c9\u5728\u6642\u9593\u6233\u5217\u4e0a\u5efa\u7acb\u7d22\u5f15\uff1a<\/p>\n
CREATE INDEX idx_timestamp ON table_name(timestamp_column);<\/code><\/pre>\n
2. \u4f7f\u7528\u4e3b\u9375\u7bc4\u570d\u67e5\u8a62<\/h3>\n
\u53e6\u4e00\u7a2e\u512a\u5316\u65b9\u6cd5\u662f\u4f7f\u7528\u4e3b\u9375\u7bc4\u570d\u67e5\u8a62\u4f86\u66ff\u4ee3 OFFSET\u3002\u9019\u7a2e\u65b9\u6cd5\u7684\u57fa\u672c\u601d\u8def\u662f\u8a18\u9304\u4e0a\u4e00\u6b21\u67e5\u8a62\u7684\u6700\u5f8c\u4e00\u689d\u8a18\u9304\u7684\u4e3b\u9375\uff0c\u7136\u5f8c\u5728\u4e0b\u4e00\u6b21\u67e5\u8a62\u4e2d\u4f7f\u7528\u8a72\u4e3b\u9375\u9032\u884c\u7bc4\u570d\u67e5\u8a62\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM table_name WHERE id > last_id ORDER BY id LIMIT 10;<\/code><\/pre>\n
\u9019\u6a23\u53ef\u4ee5\u907f\u514d\u4f7f\u7528 OFFSET\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n
3. \u4f7f\u7528\u5b50\u67e5\u8a62<\/h3>\n
\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u4f7f\u7528\u5b50\u67e5\u8a62\u53ef\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002\u901a\u904e\u5148\u67e5\u8a62\u51fa\u9700\u8981\u7684\u4e3b\u9375\uff0c\u518d\u6839\u64da\u9019\u4e9b\u4e3b\u9375\u9032\u884c\u4e3b\u67e5\u8a62\uff0c\u53ef\u4ee5\u6e1b\u5c11 MySQL \u7684\u6578\u64da\u6383\u63cf\u91cf\u3002\u4f8b\u5982\uff1a<\/p>\n
SELECT * FROM table_name WHERE id IN (SELECT id FROM table_name ORDER BY timestamp_column LIMIT 10 OFFSET 9990);<\/code><\/pre>\n
4. \u5206\u9801\u7b97\u6cd5\u7684\u6539\u9032<\/h3>\n
\u9664\u4e86\u4e0a\u8ff0\u65b9\u6cd5\uff0c\u9084\u53ef\u4ee5\u8003\u616e\u4f7f\u7528\u66f4\u9ad8\u6548\u7684\u5206\u9801\u7b97\u6cd5\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u57fa\u65bc\u6e38\u6a19\u7684\u5206\u9801\u6280\u8853\uff0c\u9019\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u5728\u4e0d\u4f7f\u7528 OFFSET \u7684\u60c5\u6cc1\u4e0b\u5be6\u73fe\u9ad8\u6548\u7684\u5206\u9801\u67e5\u8a62\u3002\u9019\u6a23\u53ef\u4ee5\u986f\u8457\u6e1b\u5c11\u67e5\u8a62\u6642\u9593\u3002<\/p>\n
\u5be6\u9a57\u7d50\u679c<\/h2>\n
\u901a\u904e\u4ee5\u4e0a\u512a\u5316\u7b56\u7565\uff0c\u6211\u5011\u5728\u4e00\u500b\u5305\u542b\u4e00\u767e\u842c\u689d\u6578\u64da\u7684\u8868\u4e2d\u9032\u884c\u4e86\u5be6\u9a57\u3002\u6700\u521d\u7684\u67e5\u8a62\u6642\u9593\u70ba 0.742 \u79d2\uff0c\u7d93\u904e\u7d22\u5f15\u512a\u5316\u3001\u4e3b\u9375\u7bc4\u570d\u67e5\u8a62\u548c\u5176\u4ed6\u6280\u8853\u7684\u61c9\u7528\u5f8c\uff0c\u67e5\u8a62\u6642\u9593\u6210\u529f\u964d\u4f4e\u81f3 0.006 \u79d2\u3002\u9019\u4e00\u7d50\u679c\u986f\u793a\u4e86\u512a\u5316\u7b56\u7565\u7684\u6709\u6548\u6027\u3002<\/p>\n
\u7d50\u8ad6<\/h2>\n
\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u7684\u6df1\u5206\u9801\u67e5\u8a62\u6642\uff0c\u6027\u80fd\u512a\u5316\u662f\u4e0d\u53ef\u5ffd\u8996\u7684\u8ab2\u984c\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u7d22\u5f15\u3001\u6539\u9032\u67e5\u8a62\u7b97\u6cd5\u4ee5\u53ca\u9078\u64c7\u5408\u9069\u7684\u67e5\u8a62\u65b9\u5f0f\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u9019\u4e0d\u50c5\u80fd\u63d0\u5347\u7528\u6236\u9ad4\u9a57\uff0c\u9084\u80fd\u6e1b\u5c11\u4f3a\u670d\u5668\u7684\u8ca0\u64d4\u3002<\/p>\n
\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u7684 VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4f86\u652f\u6301\u60a8\u7684\u6578\u64da\u5eab\u61c9\u7528\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u5e6b\u52a9\u60a8\u5be6\u73fe\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u63a2\u7d22\u5982\u4f55\u5c07 MySQL \u767e\u842c\u6578\u64da\u7684\u6df1\u5206\u9801\u67e5\u8a62\u6642\u9593\u5f9e 0.742 \u79d2\u512a\u5316\u81f3 0.006 \u79d2\uff0c\u63d0\u5347\u6578\u64da\u8655\u7406\u6548\u7387\u3002<\/p>\n","protected":false},"author":0,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-153121","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153121","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=153121"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153121\/revisions"}],"predecessor-version":[{"id":153122,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153121\/revisions\/153122"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153121"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153121"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153121"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}