{"id":60981,"date":"2024-10-13T07:26:16","date_gmt":"2024-10-12T23:26:16","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60981\/"},"modified":"2024-10-13T07:26:16","modified_gmt":"2024-10-12T23:26:16","slug":"db2%e4%b8%ad%e7%9a%84%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60981\/","title":{"rendered":"DB2\u4e2d\u7684\u805a\u96c6\u76ee\u6a19\u8868"},"content":{"rendered":"<h1 id=\"db2%e4%b8%ad%e7%9a%84%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8-BpfSdiYuDc\">DB2\u4e2d\u7684\u805a\u96c6\u76ee\u6a19\u8868<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u805a\u96c6\u76ee\u6a19\u8868\uff08Materialized Query Table, 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id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e5%92%8c%e7%ae%a1%e7%90%86%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8-BpfSdiYuDc\">\u5982\u4f55\u5275\u5efa\u548c\u7ba1\u7406\u805a\u96c6\u76ee\u6a19\u8868<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u5275\u5efa\u805a\u96c6\u76ee\u6a19\u8868\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TABLE my_mqt\nAS (SELECT column1, column2, SUM(column3) AS total\n    FROM my_table\n    GROUP BY column1, column2)\nDATA INITIALLY DEFERRED\nREFRESH DEFERRED;<\/code><\/pre>\n<p>\u5728\u9019\u500b\u4f8b\u5b50\u4e2d\uff0c\u6211\u5011\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70bamy_mqt\u7684\u805a\u96c6\u76ee\u6a19\u8868\uff0c\u8a72\u8868\u5b58\u5132\u4e86\u5f9emy_table\u4e2d\u63d0\u53d6\u7684\u6578\u64da\u3002\u4f7f\u7528DATA INITIALLY DEFERRED\u548cREFRESH DEFERRED\u9078\u9805\u610f\u5473\u8457\u6578\u64da\u5c07\u5728\u9996\u6b21\u67e5\u8a62\u6642\u9032\u884c\u52a0\u8f09\uff0c\u800c\u4e0d\u662f\u7acb\u5373\u52a0\u8f09\u3002<\/p>\n<h3 id=\"%e6%9b%b4%e6%96%b0%e8%81%9a%e9%9b%86%e7%9b%ae%e6%a8%99%e8%a1%a8-BpfSdiYuDc\">\u66f4\u65b0\u805a\u96c6\u76ee\u6a19\u8868<\/h3>\n<p>\u805a\u96c6\u76ee\u6a19\u8868\u7684\u6578\u64da\u9700\u8981\u5b9a\u671f\u66f4\u65b0\uff0c\u4ee5\u78ba\u4fdd\u5176\u6e96\u78ba\u6027\u3002DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u66f4\u65b0\u7b56\u7565\uff0c\u5305\u62ec\uff1a<\/p>\n<ul>\n<li><strong>\u5373\u6642\u66f4\u65b0\uff1a<\/strong>\u6bcf\u7576\u57fa\u790e\u8868\u6578\u64da\u767c\u751f\u8b8a\u5316\u6642\uff0c\u805a\u96c6\u76ee\u6a19\u8868\u6703\u7acb\u5373\u66f4\u65b0\u3002<\/li>\n<li><strong>\u5b9a\u671f\u66f4\u65b0\uff1a<\/strong>\u6839\u64da\u9810\u5b9a\u7684\u6642\u9593\u9593\u9694\u81ea\u52d5\u66f4\u65b0\u805a\u96c6\u76ee\u6a19\u8868\u3002<\/li>\n<li><strong>\u624b\u52d5\u66f4\u65b0\uff1a<\/strong>\u7528\u6236\u53ef\u4ee5\u6839\u64da\u9700\u8981\u624b\u52d5\u89f8\u767c\u66f4\u65b0\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-BpfSdiYuDc\">\u7e3d\u7d50<\/h2>\n<p>\u805a\u96c6\u76ee\u6a19\u8868\u5728DB2\u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u4e26\u6e1b\u5c11\u8a08\u7b97\u8ca0\u64d4\u3002\u901a\u904e\u5408\u7406\u7684\u8a2d\u8a08\u548c\u7ba1\u7406\uff0c\u805a\u96c6\u76ee\u6a19\u8868\u53ef\u4ee5\u70ba\u6578\u64da\u5206\u6790\u548c\u5831\u544a\u751f\u6210\u63d0\u4f9b\u5f37\u6709\u529b\u7684\u652f\u6301\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u6578\u64da\u8655\u7406\u7684\u4f01\u696d\u4f86\u8aaa\uff0c\u4e86\u89e3\u548c\u5229\u7528\u805a\u96c6\u76ee\u6a19\u8868\u7684\u7279\u6027\u5c07\u662f\u63d0\u5347\u696d\u52d9\u6548\u7387\u7684\u91cd\u8981\u4e00\u6b65\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u696d\u52d9\u4e2d\u5be6\u65bd\u9019\u4e9b\u6280\u8853\u6709\u8208\u8da3\uff0c\u6216\u8005\u60f3\u4e86\u89e3\u66f4\u591a\u95dc\u65bc<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u548c<a href=\"https:\/\/server.hk\">\u96f2\u4f3a\u670d\u5668<\/a>\u7684\u8cc7\u8a0a\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22DB2\u4e2d\u7684\u805a\u96c6\u76ee\u6807\u8868\uff0c\u4e86\u89e3\u5176\u7ed3\u6784\u3001\u529f\u80fd\u53ca\u5728\u6570\u636e\u7ba1\u7406\u4e2d\u7684\u5e94\u7528\uff0c\u63d0\u5347\u6570\u636e\u5e93\u6027\u80fd\u4e0e\u6548\u7387\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-60981","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60981","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"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=60981"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60981\/revisions"}],"predecessor-version":[{"id":60982,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60981\/revisions\/60982"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60981"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60981"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60981"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}