{"id":96064,"date":"2024-10-20T06:18:18","date_gmt":"2024-10-19T22:18:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96064\/"},"modified":"2024-10-20T06:18:18","modified_gmt":"2024-10-19T22:18:18","slug":"oracle%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96064\/","title":{"rendered":"Oracle\u7d22\u5f15\u7684\u985e\u578b"},"content":{"rendered":"<h1 id=\"oracle%e7%b4%a2%e5%bc%95%e7%9a%84%e9%a1%9e%e5%9e%8b-kWKYPkKwmp\">Oracle\u7d22\u5f15\u7684\u985e\u578b<\/h1>\n<p>\u5728\u8cc7\u6599\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\u3002Oracle\u8cc7\u6599\u5eab\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\u8a0eOracle\u7d22\u5f15\u7684\u4e3b\u8981\u985e\u578b\u53ca\u5176\u7279\u9ede\u3002<\/p>\n<h2 id=\"1-b%e6%a8%b9%e7%b4%a2%e5%bc%95%ef%bc%88b-tree-index%ef%bc%89-kWKYPkKwmp\">1. B\u6a39\u7d22\u5f15\uff08B-Tree Index\uff09<\/h2>\n<p>B\u6a39\u7d22\u5f15\u662fOracle\u4e2d\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\u3002\u5b83\u7684\u7d50\u69cb\u985e\u4f3c\u65bc\u4e00\u68f5\u6a39\uff0c\u80fd\u5920\u6709\u6548\u5730\u652f\u6301\u7bc4\u570d\u67e5\u8a62\u548c\u7cbe\u78ba\u67e5\u8a62\u3002B\u6a39\u7d22\u5f15\u7684\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u652f\u6301\u5feb\u901f\u67e5\u8a62\uff1aB\u6a39\u7d22\u5f15\u80fd\u5920\u5728O(log n)\u7684\u6642\u9593\u5167\u627e\u5230\u6578\u64da\u3002<\/li>\n<li>\u81ea\u52d5\u5e73\u8861\uff1a\u7576\u63d2\u5165\u6216\u522a\u9664\u6578\u64da\u6642\uff0cB\u6a39\u6703\u81ea\u52d5\u9032\u884c\u5e73\u8861\uff0c\u4ee5\u4fdd\u6301\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li>\u9069\u5408\u7bc4\u570d\u67e5\u8a62\uff1a\u53ef\u4ee5\u6709\u6548\u5730\u8655\u7406\u5927\u7bc4\u570d\u7684\u67e5\u8a62\uff0c\u4f8b\u5982\u67e5\u8a62\u67d0\u500b\u7bc4\u570d\u5167\u7684\u6240\u6709\u8a18\u9304\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efaB\u6a39\u7d22\u5f15\u7684SQL\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_example ON employees (last_name);<\/code><\/pre>\n<h2 id=\"2-%e4%bd%8d%e5%9c%96%e7%b4%a2%e5%bc%95%ef%bc%88bitmap-index%ef%bc%89-kWKYPkKwmp\">2. \u4f4d\u5716\u7d22\u5f15\uff08Bitmap Index\uff09<\/h2>\n<p>\u4f4d\u5716\u7d22\u5f15\u9069\u5408\u7528\u65bc\u4f4e\u57fa\u6578\u7684\u5217\uff08\u5373\u5217\u4e2d\u4e0d\u540c\u503c\u7684\u6578\u91cf\u8f03\u5c11\uff09\u3002\u5b83\u4f7f\u7528\u4f4d\u5716\u4f86\u8868\u793a\u6bcf\u500b\u53ef\u80fd\u503c\u7684\u5b58\u5728\u8207\u5426\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f4d\u5716\u7d22\u5f15\u7684\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u7bc0\u7701\u7a7a\u9593\uff1a\u5c0d\u65bc\u4f4e\u57fa\u6578\u7684\u5217\uff0c\u4f4d\u5716\u7d22\u5f15\u80fd\u5920\u986f\u8457\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<li>\u9069\u5408\u8907\u96dc\u67e5\u8a62\uff1a\u80fd\u5920\u5feb\u901f\u8655\u7406\u591a\u500b\u689d\u4ef6\u7684\u67e5\u8a62\uff0c\u4f8b\u5982\u4f7f\u7528AND\u3001OR\u7b49\u908f\u8f2f\u904b\u7b97\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efa\u4f4d\u5716\u7d22\u5f15\u7684SQL\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE BITMAP INDEX idx_example_bitmap ON employees (department_id);<\/code><\/pre>\n<h2 id=\"3-%e5%94%af%e4%b8%80%e7%b4%a2%e5%bc%95%ef%bc%88unique-index%ef%bc%89-kWKYPkKwmp\">3. \u552f\u4e00\u7d22\u5f15\uff08Unique Index\uff09<\/h2>\n<p>\u552f\u4e00\u7d22\u5f15\u78ba\u4fdd\u7d22\u5f15\u5217\u4e2d\u7684\u6bcf\u500b\u503c\u90fd\u662f\u552f\u4e00\u7684\u3002\u9019\u5c0d\u65bc\u9700\u8981\u4fdd\u6301\u6578\u64da\u5b8c\u6574\u6027\u7684\u60c5\u6cc1\u975e\u5e38\u91cd\u8981\u3002\u552f\u4e00\u7d22\u5f15\u7684\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u81ea\u52d5\u9632\u6b62\u91cd\u8907\uff1a\u7576\u63d2\u5165\u91cd\u8907\u503c\u6642\uff0cOracle\u6703\u81ea\u52d5\u62d2\u7d55\u8a72\u64cd\u4f5c\u3002<\/li>\n<li>\u53ef\u7528\u65bc\u4e3b\u9375\uff1a\u4e3b\u9375\u7d04\u675f\u81ea\u52d5\u5275\u5efa\u552f\u4e00\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efa\u552f\u4e00\u7d22\u5f15\u7684SQL\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE UNIQUE INDEX idx_unique_example ON employees (email);<\/code><\/pre>\n<h2 id=\"4-%e5%87%bd%e6%95%b8%e7%b4%a2%e5%bc%95%ef%bc%88function-based-index%ef%bc%89-kWKYPkKwmp\">4. \u51fd\u6578\u7d22\u5f15\uff08Function-Based Index\uff09<\/h2>\n<p>\u51fd\u6578\u7d22\u5f15\u5141\u8a31\u5728\u7d22\u5f15\u4e2d\u4f7f\u7528\u8868\u9054\u5f0f\u6216\u51fd\u6578\uff0c\u9019\u5c0d\u65bc\u9700\u8981\u57fa\u65bc\u8a08\u7b97\u7d50\u679c\u9032\u884c\u67e5\u8a62\u7684\u60c5\u6cc1\u975e\u5e38\u6709\u7528\u3002\u51fd\u6578\u7d22\u5f15\u7684\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u652f\u6301\u8907\u96dc\u67e5\u8a62\uff1a\u53ef\u4ee5\u57fa\u65bc\u8a08\u7b97\u7d50\u679c\u9032\u884c\u67e5\u8a62\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<li>\u9748\u6d3b\u6027\u9ad8\uff1a\u53ef\u4ee5\u4f7f\u7528\u591a\u7a2e\u51fd\u6578\uff0c\u5982\u5b57\u7b26\u4e32\u51fd\u6578\u3001\u6578\u5b78\u51fd\u6578\u7b49\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efa\u51fd\u6578\u7d22\u5f15\u7684SQL\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_function_example ON employees (UPPER(last_name));<\/code><\/pre>\n<h2 id=\"5-%e5%8f%8d%e5%90%91%e7%b4%a2%e5%bc%95%ef%bc%88reverse-key-index%ef%bc%89-kWKYPkKwmp\">5. \u53cd\u5411\u7d22\u5f15\uff08Reverse Key Index\uff09<\/h2>\n<p>\u53cd\u5411\u7d22\u5f15\u662f\u4e00\u7a2e\u7279\u6b8a\u7684B\u6a39\u7d22\u5f15\uff0c\u4e3b\u8981\u7528\u65bc\u9632\u6b62\u7d22\u5f15\u7684\u71b1\u9ede\u554f\u984c\u3002\u5b83\u901a\u904e\u53cd\u8f49\u9375\u503c\u7684\u5b57\u7bc0\u9806\u5e8f\u4f86\u5206\u6563\u63d2\u5165\u64cd\u4f5c\u3002\u53cd\u5411\u7d22\u5f15\u7684\u7279\u9ede\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u6e1b\u5c11\u71b1\u9ede\uff1a\u901a\u904e\u5206\u6563\u63d2\u5165\u64cd\u4f5c\uff0c\u6e1b\u5c11\u4e86\u5c0d\u540c\u4e00\u9801\u9762\u7684\u7af6\u722d\u3002<\/li>\n<li>\u9069\u5408\u5e8f\u5217\u865f\uff1a\u7279\u5225\u9069\u5408\u7528\u65bc\u5e8f\u5217\u865f\u7684\u7d22\u5f15\u3002<\/li>\n<\/ul>\n<p>\u4ee5\u4e0b\u662f\u5275\u5efa\u53cd\u5411\u7d22\u5f15\u7684SQL\u8a9e\u53e5\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE INDEX idx_reverse_example ON employees (employee_id) REVERSE;<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-kWKYPkKwmp\">\u7e3d\u7d50<\/h2>\n<p>Oracle\u8cc7\u6599\u5eab\u63d0\u4f9b\u4e86\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u4ee5\u6eff\u8db3\u4e0d\u540c\u7684\u67e5\u8a62\u9700\u6c42\u3002\u5f9eB\u6a39\u7d22\u5f15\u5230\u4f4d\u5716\u7d22\u5f15\uff0c\u518d\u5230\u51fd\u6578\u7d22\u5f15\u548c\u53cd\u5411\u7d22\u5f15\uff0c\u6bcf\u7a2e\u7d22\u5f15\u90fd\u6709\u5176\u7279\u5b9a\u7684\u61c9\u7528\u5834\u666f\u3002\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u5f9e\u800c\u63d0\u5347\u6574\u9ad4\u7cfb\u7d71\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u60a8\u7684\u61c9\u7528\u4e2d\u4f7f\u7528\u9019\u4e9b\u7d22\u5f15\u985e\u578b\u6709\u9032\u4e00\u6b65\u7684\u8208\u8da3\uff0c\u6216\u662f\u9700\u8981\u9ad8\u6548\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u6b61\u8fce\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4ee5\u7372\u53d6\u66f4\u591a\u8cc7\u8a0a\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u7d22\u5f15\u7684\u985e\u578b\uff0c\u5305\u62ecB-tree\u3001\u4f4d\u5716\u3001\u53cd\u5411\u548c\u529f\u80fd\u7d22\u5f15\uff0c\u63d0\u5347\u67e5\u8a62\u6027\u80fd\u548c\u6578\u64da\u7ba1\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-96064","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96064","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=96064"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96064\/revisions"}],"predecessor-version":[{"id":96065,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96064\/revisions\/96065"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96064"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96064"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96064"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}