{"id":153715,"date":"2024-11-02T09:45:20","date_gmt":"2024-11-02T01:45:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/153715\/"},"modified":"2024-11-02T09:45:21","modified_gmt":"2024-11-02T01:45:21","slug":"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3db2%e7%b4%a2%e5%bc%95%e7%b5%90%e6%a7%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/153715\/","title":{"rendered":"\u5e36\u60a8\u4e86\u89e3DB2\u7d22\u5f15\u7d50\u69cb"},"content":{"rendered":"<h1 id=\"%e5%b8%b6%e6%82%a8%e4%ba%86%e8%a7%a3db2%e7%b4%a2%e5%bc%95%e7%b5%90%e6%a7%8b-CUfgAqMRLf\">\u5e36\u60a8\u4e86\u89e3DB2\u7d22\u5f15\u7d50\u69cb<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\u4e2d\uff0c\u7d22\u5f15\u662f\u4e00\u7a2e\u91cd\u8981\u7684\u6578\u64da\u7d50\u69cb\uff0c\u7528\u65bc\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002IBM\u7684DB2\u6578\u64da\u5eab\u7cfb\u7d71\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u61c9\u7528\u9700\u6c42\u3002\u672c\u6587\u5c07\u6df1\u5165\u63a2\u8a0eDB2\u7684\u7d22\u5f15\u7d50\u69cb\uff0c\u5305\u62ec\u5176\u985e\u578b\u3001\u5de5\u4f5c\u539f\u7406\u53ca\u6700\u4f73\u5be6\u8e10\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afdb2%e7%b4%a2%e5%bc%95%ef%bc%9f-CUfgAqMRLf\">\u4ec0\u9ebc\u662fDB2\u7d22\u5f15\uff1f<\/h2>\n<p>\u7d22\u5f15\u662f\u4e00\u7a2e\u6578\u64da\u7d50\u69cb\uff0c\u80fd\u5920\u52a0\u901f\u6578\u64da\u6aa2\u7d22\u7684\u904e\u7a0b\u3002DB2\u4e2d\u7684\u7d22\u5f15\u985e\u4f3c\u65bc\u66f8\u7c4d\u7684\u76ee\u9304\uff0c\u5e6b\u52a9\u6578\u64da\u5eab\u5feb\u901f\u5b9a\u4f4d\u6240\u9700\u7684\u6578\u64da\u3002\u7576\u67e5\u8a62\u6d89\u53ca\u5230\u5927\u91cf\u6578\u64da\u6642\uff0c\u7d22\u5f15\u7684\u4f7f\u7528\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h2 id=\"db2%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b-CUfgAqMRLf\">DB2\u7d22\u5f15\u7684\u985e\u578b<\/h2>\n<p>DB2\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4e3b\u8981\u5305\u62ec\u4ee5\u4e0b\u5e7e\u7a2e\uff1a<\/p>\n<ul>\n<li><strong>B\u6a39\u7d22\u5f15\uff08B-Tree Index\uff09<\/strong>: \u9019\u662fDB2\u4e2d\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\uff0c\u9069\u7528\u65bc\u7bc4\u570d\u67e5\u8a62\u548c\u7b49\u503c\u67e5\u8a62\u3002B\u6a39\u7d22\u5f15\u7684\u7d50\u69cb\u4f7f\u5f97\u67e5\u8a62\u64cd\u4f5c\u7684\u6642\u9593\u8907\u96dc\u5ea6\u70baO(log n)\u3002<\/li>\n<li><strong>\u54c8\u5e0c\u7d22\u5f15\uff08Hash Index\uff09<\/strong>: \u54c8\u5e0c\u7d22\u5f15\u9069\u5408\u7528\u65bc\u7b49\u503c\u67e5\u8a62\uff0c\u56e0\u70ba\u5b83\u4f7f\u7528\u54c8\u5e0c\u51fd\u6578\u5c07\u9375\u503c\u6620\u5c04\u5230\u7d22\u5f15\u9801\u9762\u3002\u9019\u7a2e\u7d22\u5f15\u4e0d\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u3002<\/li>\n<li><strong>\u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/strong>: \u6b64\u985e\u7d22\u5f15\u78ba\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6bcf\u500b\u503c\u90fd\u662f\u552f\u4e00\u7684\uff0c\u901a\u5e38\u7528\u65bc\u4e3b\u9375\u6216\u552f\u4e00\u7d04\u675f\u3002<\/li>\n<li><strong>\u5fa9\u5408\u7d22\u5f15\uff08Composite Index\uff09<\/strong>: \u7576\u7d22\u5f15\u7531\u591a\u500b\u5217\u7d44\u6210\u6642\uff0c\u7a31\u70ba\u5fa9\u5408\u7d22\u5f15\u3002\u9019\u7a2e\u7d22\u5f15\u5c0d\u65bc\u591a\u5217\u67e5\u8a62\u7279\u5225\u6709\u6548\u3002<\/li>\n<\/ul>\n<h2 id=\"db2%e7%b4%a2%e5%bc%95%e7%9a%84%e5%b7%a5%e4%bd%9c%e5%8e%9f%e7%90%86-CUfgAqMRLf\">DB2\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406<\/h2>\n<p>DB2\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u57fa\u65bc\u6a39\u5f62\u7d50\u69cb\u3002\u7576\u6578\u64da\u88ab\u63d2\u5165\u3001\u66f4\u65b0\u6216\u522a\u9664\u6642\uff0c\u7d22\u5f15\u4e5f\u6703\u96a8\u4e4b\u66f4\u65b0\u3002\u9019\u6a23\uff0c\u7576\u7528\u6236\u767c\u51fa\u67e5\u8a62\u6642\uff0cDB2\u53ef\u4ee5\u901a\u904e\u7d22\u5f15\u5feb\u901f\u5b9a\u4f4d\u5230\u6578\u64da\u7684\u7269\u7406\u4f4d\u7f6e\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/p>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e5%89%b5%e5%bb%ba-CUfgAqMRLf\">\u7d22\u5f15\u7684\u5275\u5efa<\/h3>\n<p>\u5728DB2\u4e2d\uff0c\u5275\u5efa\u7d22\u5f15\u7684\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>CREATE INDEX index_name\nON table_name (column1, column2, ...);<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u82e5\u8981\u5728\u540d\u70ba\u201cemployees\u201d\u7684\u8868\u4e0a\u5275\u5efa\u4e00\u500b\u57fa\u65bc\u201clast_name\u201d\u548c\u201cfirst_name\u201d\u5217\u7684\u7d22\u5f15\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u8a9e\u53e5\uff1a<\/p>\n<pre><code>CREATE INDEX idx_name\nON employees (last_name, first_name);<\/code><\/pre>\n<h3 id=\"%e7%b4%a2%e5%bc%95%e7%9a%84%e7%b6%ad%e8%ad%b7-CUfgAqMRLf\">\u7d22\u5f15\u7684\u7dad\u8b77<\/h3>\n<p>\u7d22\u5f15\u7684\u7dad\u8b77\u662f\u78ba\u4fdd\u6578\u64da\u5eab\u6027\u80fd\u7684\u95dc\u9375\u3002\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\uff0c\u7d22\u5f15\u53ef\u80fd\u6703\u8b8a\u5f97\u4e0d\u5920\u6709\u6548\uff0c\u56e0\u6b64\u5b9a\u671f\u91cd\u5efa\u6216\u91cd\u65b0\u7d44\u7e54\u7d22\u5f15\u662f\u5fc5\u8981\u7684\u3002DB2\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u547d\u4ee4\u4f86\u5e6b\u52a9\u7528\u6236\u9032\u884c\u7d22\u5f15\u7684\u7dad\u8b77\u3002<\/p>\n<h2 id=\"%e6%9c%80%e4%bd%b3%e5%af%a6%e8%b8%90-CUfgAqMRLf\">\u6700\u4f73\u5be6\u8e10<\/h2>\n<p>\u5728\u4f7f\u7528DB2\u7d22\u5f15\u6642\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li>\u50c5\u70ba\u7d93\u5e38\u67e5\u8a62\u7684\u5217\u5275\u5efa\u7d22\u5f15\uff0c\u4ee5\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u6027\u80fd\u958b\u92b7\u3002<\/li>\n<li>\u5b9a\u671f\u6aa2\u67e5\u548c\u91cd\u5efa\u7d22\u5f15\uff0c\u4ee5\u4fdd\u6301\u5176\u6548\u7387\u3002<\/li>\n<li>\u4f7f\u7528\u552f\u4e00\u7d22\u5f15\u4f86\u5f37\u5236\u6578\u64da\u5b8c\u6574\u6027\u3002<\/li>\n<li>\u5728\u9032\u884c\u5927\u91cf\u6578\u64da\u63d2\u5165\u6216\u66f4\u65b0\u6642\uff0c\u8003\u616e\u66ab\u6642\u7981\u7528\u7d22\u5f15\uff0c\u4ee5\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-CUfgAqMRLf\">\u7e3d\u7d50<\/h2>\n<p>DB2\u7d22\u5f15\u7d50\u69cb\u662f\u6578\u64da\u5eab\u6027\u80fd\u512a\u5316\u7684\u91cd\u8981\u7d44\u6210\u90e8\u5206\u3002\u901a\u904e\u5408\u7406\u4f7f\u7528\u4e0d\u540c\u985e\u578b\u7684\u7d22\u5f15\uff0c\u4e26\u9075\u5faa\u6700\u4f73\u5be6\u8e10\uff0c\u60a8\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002\u4e86\u89e3DB2\u7d22\u5f15\u7684\u5de5\u4f5c\u539f\u7406\u548c\u7dad\u8b77\u65b9\u6cd5\uff0c\u5c07\u6709\u52a9\u65bc\u60a8\u66f4\u597d\u5730\u7ba1\u7406\u6578\u64da\u5eab\u7cfb\u7d71\u3002\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u74b0\u5883\u4e2d\u90e8\u7f72DB2\u6709\u8208\u8da3\uff0c\u8acb\u96a8\u6642\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u6df1\u5165\u4e86\u89e3DB2\u7d22\u5f15\u7d50\u69cb\uff0c\u63a2\u7d22\u5176\u8a2d\u8a08\u539f\u7406\u3001\u985e\u578b\u53ca\u6700\u4f73\u5be6\u8e10\uff0c\u63d0\u5347\u6578\u64da\u5eab\u6027\u80fd\u8207\u67e5\u8a62\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-153715","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153715","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=153715"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153715\/revisions"}],"predecessor-version":[{"id":153716,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/153715\/revisions\/153716"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=153715"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=153715"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=153715"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}