{"id":60369,"date":"2024-10-13T02:17:15","date_gmt":"2024-10-12T18:17:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/60369\/"},"modified":"2024-10-13T02:17:15","modified_gmt":"2024-10-12T18:17:15","slug":"db2-%e7%89%a9%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%a1%a8%e4%bb%a5%e5%8f%8a%e5%85%b6%e4%bb%96%e5%b8%b8%e7%94%a8%e8%a1%a8%e7%9a%84%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/60369\/","title":{"rendered":"DB2 \u7269\u5316\u67e5\u8a62\u8868\u4ee5\u53ca\u5176\u4ed6\u5e38\u7528\u8868\u7684\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"db2-%e7%89%a9%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%a1%a8%e4%bb%a5%e5%8f%8a%e5%85%b6%e4%bb%96%e5%b8%b8%e7%94%a8%e8%a1%a8%e7%9a%84%e4%bb%8b%e7%b4%b9-rJrybqjgBi\">DB2 \u7269\u5316\u67e5\u8a62\u8868\u4ee5\u53ca\u5176\u4ed6\u5e38\u7528\u8868\u7684\u4ecb\u7d39<\/h1>\n<p>\u5728\u8cc7\u6599\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u67e5\u8a62\u6027\u80fd\u7684\u512a\u5316\u662f\u6bcf\u4f4d\u958b\u767c\u8005\u548c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u7684\u91cd\u8981\u4efb\u52d9\u3002IBM \u7684 DB2 \u8cc7\u6599\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u6280\u8853\u4f86\u63d0\u5347\u67e5\u8a62\u6548\u7387\uff0c\u5176\u4e2d\u4e4b\u4e00\u4fbf\u662f\u7269\u5316\u67e5\u8a62\u8868\uff08Materialized Query Tables, MQTs\uff09\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0e DB2 \u7684\u7269\u5316\u67e5\u8a62\u8868\u53ca\u5176\u4ed6\u5e38\u7528\u8868\u7684\u7279\u6027\u548c\u61c9\u7528\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%89%a9%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%a1%a8%ef%bc%88mqt%ef%bc%89%ef%bc%9f-rJrybqjgBi\">\u4ec0\u9ebc\u662f\u7269\u5316\u67e5\u8a62\u8868\uff08MQT\uff09\uff1f<\/h2>\n<p>\u7269\u5316\u67e5\u8a62\u8868\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u8cc7\u6599\u5eab\u5c0d\u8c61\uff0c\u5b83\u5b58\u5132\u4e86\u67e5\u8a62\u7684\u7d50\u679c\u96c6\uff0c\u800c\u4e0d\u662f\u50c5\u50c5\u5b58\u5132\u67e5\u8a62\u7684\u5b9a\u7fa9\u3002\u9019\u610f\u5473\u8457\u7576\u67e5\u8a62\u88ab\u57f7\u884c\u6642\uff0cDB2 \u53ef\u4ee5\u76f4\u63a5\u5f9e\u7269\u5316\u67e5\u8a62\u8868\u4e2d\u6aa2\u7d22\u6578\u64da\uff0c\u800c\u7121\u9700\u91cd\u65b0\u8a08\u7b97\u67e5\u8a62\uff0c\u5f9e\u800c\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<h3 id=\"mqt-%e7%9a%84%e5%84%aa%e5%8b%a2-rJrybqjgBi\">MQT \u7684\u512a\u52e2<\/h3>\n<ul>\n<li><strong>\u6027\u80fd\u63d0\u5347\uff1a<\/strong>\u7531\u65bc\u67e5\u8a62\u7d50\u679c\u5df2\u7d93\u88ab\u8a08\u7b97\u4e26\u5b58\u5132\uff0c\u67e5\u8a62\u7684\u57f7\u884c\u901f\u5ea6\u5927\u5e45\u63d0\u9ad8\u3002<\/li>\n<li><strong>\u6e1b\u5c11\u8a08\u7b97\u8ca0\u64d4\uff1a<\/strong>\u5728\u8655\u7406\u8907\u96dc\u67e5\u8a62\u6642\uff0cMQT \u53ef\u4ee5\u6e1b\u5c11\u8cc7\u6599\u5eab\u7684\u8a08\u7b97\u8ca0\u64d4\uff0c\u7279\u5225\u662f\u5728\u5927\u6578\u64da\u96c6\u4e0a\u3002<\/li>\n<li><strong>\u652f\u6301\u589e\u91cf\u66f4\u65b0\uff1a<\/strong>MQT \u53ef\u4ee5\u8a2d\u7f6e\u70ba\u5728\u57fa\u790e\u8868\u66f4\u65b0\u6642\u81ea\u52d5\u66f4\u65b0\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u5373\u6642\u6027\u3002<\/li>\n<\/ul>\n<h3 id=\"%e5%a6%82%e4%bd%95%e5%89%b5%e5%bb%ba%e7%89%a9%e5%8c%96%e6%9f%a5%e8%a9%a2%e8%a1%a8-rJrybqjgBi\">\u5982\u4f55\u5275\u5efa\u7269\u5316\u67e5\u8a62\u8868<\/h3>\n<p>\u5728 DB2 \u4e2d\u5275\u5efa\u7269\u5316\u67e5\u8a62\u8868\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE MATERIALIZED QUERY TABLE my_mqt AS\nSELECT column1, column2, SUM(column3) AS total\nFROM my_table\nGROUP BY column1, column2\nWITH DATA;<\/code><\/pre>\n<p>\u4e0a\u8ff0\u8a9e\u53e5\u5275\u5efa\u4e86\u4e00\u500b\u540d\u70ba <code>my_mqt<\/code> \u7684\u7269\u5316\u67e5\u8a62\u8868\uff0c\u8a72\u8868\u5b58\u5132\u4e86\u5f9e <code>my_table<\/code> \u4e2d\u67e5\u8a62\u7684\u7d50\u679c\u3002<\/p>\n<h2 id=\"%e5%85%b6%e4%bb%96%e5%b8%b8%e7%94%a8%e8%a1%a8%e7%9a%84%e4%bb%8b%e7%b4%b9-rJrybqjgBi\">\u5176\u4ed6\u5e38\u7528\u8868\u7684\u4ecb\u7d39<\/h2>\n<h3 id=\"%e8%a6%96%e5%9c%96%ef%bc%88views%ef%bc%89-rJrybqjgBi\">\u8996\u5716\uff08Views\uff09<\/h3>\n<p>\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u5b83\u4e0d\u5b58\u5132\u6578\u64da\uff0c\u800c\u662f\u57fa\u65bc\u67e5\u8a62\u7684\u7d50\u679c\u96c6\u3002\u8996\u5716\u53ef\u4ee5\u7c21\u5316\u8907\u96dc\u67e5\u8a62\uff0c\u4e26\u63d0\u4f9b\u6578\u64da\u7684\u5b89\u5168\u6027\u548c\u62bd\u8c61\u5c64\u3002\u5275\u5efa\u8996\u5716\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE VIEW my_view AS\nSELECT column1, column2\nFROM my_table\nWHERE column3 &gt; 100;<\/code><\/pre>\n<h3 id=\"%e8%87%a8%e6%99%82%e8%a1%a8%ef%bc%88temporary-tables%ef%bc%89-rJrybqjgBi\">\u81e8\u6642\u8868\uff08Temporary Tables\uff09<\/h3>\n<p>\u81e8\u6642\u8868\u662f\u4e00\u7a2e\u5728\u6703\u8a71\u671f\u9593\u5b58\u5728\u7684\u8868\uff0c\u7576\u6703\u8a71\u7d50\u675f\u6642\uff0c\u81e8\u6642\u8868\u6703\u81ea\u52d5\u522a\u9664\u3002\u9019\u985e\u8868\u901a\u5e38\u7528\u65bc\u5b58\u5132\u4e2d\u9593\u7d50\u679c\uff0c\u65b9\u4fbf\u9032\u884c\u5f8c\u7e8c\u7684\u8a08\u7b97\u3002\u5275\u5efa\u81e8\u6642\u8868\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE TEMPORARY TABLE my_temp_table (\n    column1 INT,\n    column2 VARCHAR(100)\n);<\/code><\/pre>\n<h3 id=\"%e7%b4%a2%e5%bc%95%ef%bc%88indexes%ef%bc%89-rJrybqjgBi\">\u7d22\u5f15\uff08Indexes\uff09<\/h3>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u7279\u6b8a\u7684\u8cc7\u6599\u7d50\u69cb\uff0c\u7528\u65bc\u52a0\u901f\u67e5\u8a62\u64cd\u4f5c\u3002DB2 \u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ec\u552f\u4e00\u7d22\u5f15\u548c\u975e\u552f\u4e00\u7d22\u5f15\u3002\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE INDEX my_index ON my_table (column1);<\/code><\/pre>\n<h2 id=\"%e7%b5%90%e8%ab%96-rJrybqjgBi\">\u7d50\u8ad6<\/h2>\n<p>\u7269\u5316\u67e5\u8a62\u8868\u5728 DB2 \u4e2d\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u7279\u5225\u662f\u5728\u8655\u7406\u5927\u91cf\u6578\u64da\u6642\u3002\u9664\u4e86\u7269\u5316\u67e5\u8a62\u8868\uff0c\u8996\u5716\u3001\u81e8\u6642\u8868\u548c\u7d22\u5f15\u7b49\u5176\u4ed6\u8cc7\u6599\u5eab\u5c0d\u8c61\u4e5f\u5728\u65e5\u5e38\u7684\u8cc7\u6599\u5eab\u7ba1\u7406\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u89d2\u8272\u3002\u4e86\u89e3\u9019\u4e9b\u5de5\u5177\u7684\u7279\u6027\u548c\u4f7f\u7528\u65b9\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u958b\u767c\u8005\u548c\u8cc7\u6599\u5eab\u7ba1\u7406\u54e1\u66f4\u6709\u6548\u5730\u7ba1\u7406\u548c\u512a\u5316\u8cc7\u6599\u5eab\u3002<\/p>\n<p>\u5982\u9700\u9032\u4e00\u6b65\u4e86\u89e3 <a href=\"https:\/\/server.hk\">\u9999\u6e2f VPS<\/a> \u53ca\u5176\u4ed6\u4f3a\u670d\u5668\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3DB2\u7269\u5316\u67e5\u8a62\u8868\u53ca\u5176\u4ed6\u5e38\u7528\u8868\u7684\u529f\u80fd\u8207\u61c9\u7528\uff0c\u63d0\u5347\u6578\u64da\u67e5\u8a62\u6548\u7387\uff0c\u512a\u5316\u8cc7\u6599\u5eab\u6027\u80fd\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-60369","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60369","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=60369"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60369\/revisions"}],"predecessor-version":[{"id":60370,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/60369\/revisions\/60370"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=60369"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=60369"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=60369"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}