{"id":95592,"date":"2024-10-20T02:21:17","date_gmt":"2024-10-19T18:21:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95592\/"},"modified":"2024-10-20T02:21:17","modified_gmt":"2024-10-19T18:21:17","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e8%a1%a8%e8%88%87%e7%b4%a2%e5%bc%95%e4%bf%9d%e8%ad%89%e6%80%a7%e8%83%bd%e7%9a%84%e6%96%b9%e6%a1%88%e4%bb%8b%e7%b4%b9","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95592\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u7684\u8868\u8207\u7d22\u5f15\u4fdd\u8b49\u6027\u80fd\u7684\u65b9\u6848\u4ecb\u7d39"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%9a%84%e8%a1%a8%e8%88%87%e7%b4%a2%e5%bc%95%e4%bf%9d%e8%ad%89%e6%80%a7%e8%83%bd%e7%9a%84%e6%96%b9%e6%a1%88%e4%bb%8b%e7%b4%b9-neMZMQXKpo\">Oracle\u6578\u64da\u5eab\u7684\u8868\u8207\u7d22\u5f15\u4fdd\u8b49\u6027\u80fd\u7684\u65b9\u6848\u4ecb\u7d39<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u6027\u80fd\u5c0d\u65bc\u4f01\u696d\u7684\u904b\u71df\u81f3\u95dc\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u95dc\u4fc2\u578b\u6578\u64da\u5eab\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u529f\u80fd\u4f86\u512a\u5316\u6578\u64da\u5b58\u53d6\u548c\u67e5\u8a62\u6027\u80fd\u3002\u672c\u6587\u5c07\u63a2\u8a0eOracle\u6578\u64da\u5eab\u4e2d\u8868\u8207\u7d22\u5f15\u7684\u8a2d\u8a08\u53ca\u5176\u5c0d\u6027\u80fd\u7684\u5f71\u97ff\uff0c\u4e26\u4ecb\u7d39\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u65b9\u6848\u3002<\/p>\n<h2 id=\"1-%e8%a1%a8%e7%9a%84%e8%a8%ad%e8%a8%88-neMZMQXKpo\">1. \u8868\u7684\u8a2d\u8a08<\/h2>\n<p>\u8868\u662f\u6578\u64da\u5eab\u4e2d\u5b58\u5132\u6578\u64da\u7684\u57fa\u672c\u55ae\u4f4d\u3002\u826f\u597d\u7684\u8868\u8a2d\u8a08\u4e0d\u50c5\u80fd\u63d0\u9ad8\u6578\u64da\u7684\u5b58\u53d6\u901f\u5ea6\uff0c\u9084\u80fd\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u7684\u6d6a\u8cbb\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u8868\u8a2d\u8a08\u7684\u6700\u4f73\u5be6\u8e10\uff1a<\/p>\n<ul>\n<li><strong>\u6b63\u898f\u5316\uff1a<\/strong>\u901a\u904e\u6b63\u898f\u5316\u4f86\u6d88\u9664\u6578\u64da\u5197\u9918\uff0c\u78ba\u4fdd\u6578\u64da\u7684\u4e00\u81f4\u6027\u3002\u901a\u5e38\uff0c\u5c07\u6578\u64da\u5206\u70ba\u591a\u500b\u8868\uff0c\u4e26\u901a\u904e\u5916\u9375\u95dc\u806f\u4f86\u7dad\u8b77\u6578\u64da\u5b8c\u6574\u6027\u3002<\/li>\n<li><strong>\u9078\u64c7\u5408\u9069\u7684\u6578\u64da\u985e\u578b\uff1a<\/strong>\u4f7f\u7528\u5408\u9069\u7684\u6578\u64da\u985e\u578b\u53ef\u4ee5\u6e1b\u5c11\u5b58\u5132\u7a7a\u9593\u4e26\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002\u4f8b\u5982\uff0c\u5c0d\u65bc\u6574\u6578\u6578\u64da\uff0c\u4f7f\u7528NUMBER\u985e\u578b\u800c\u4e0d\u662fVARCHAR2\u3002<\/li>\n<li><strong>\u5408\u7406\u8a2d\u8a08\u4e3b\u9375\uff1a<\/strong>\u4e3b\u9375\u61c9\u8a72\u662f\u552f\u4e00\u4e14\u4e0d\u8b8a\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u63d0\u9ad8\u67e5\u8a62\u6548\u7387\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e7%b4%a2%e5%bc%95%e7%9a%84%e4%bd%bf%e7%94%a8-neMZMQXKpo\">2. \u7d22\u5f15\u7684\u4f7f\u7528<\/h2>\n<p>\u7d22\u5f15\u662f\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u901f\u5ea6\u7684\u91cd\u8981\u5de5\u5177\u3002Oracle\u6578\u64da\u5eab\u652f\u6301\u591a\u7a2e\u7d22\u5f15\u985e\u578b\uff0c\u5305\u62ecB\u6a39\u7d22\u5f15\u3001\u4f4d\u5716\u7d22\u5f15\u548c\u53cd\u5411\u7d22\u5f15\u7b49\u3002\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u5c0d\u65bc\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002<\/p>\n<h3 id=\"2-1-b%e6%a8%b9%e7%b4%a2%e5%bc%95-neMZMQXKpo\">2.1 B\u6a39\u7d22\u5f15<\/h3>\n<p>B\u6a39\u7d22\u5f15\u662f\u6700\u5e38\u7528\u7684\u7d22\u5f15\u985e\u578b\uff0c\u9069\u5408\u65bc\u9ad8\u57fa\u6578\u7684\u5217\u3002\u5b83\u80fd\u5920\u5feb\u901f\u5b9a\u4f4d\u5230\u6578\u64da\u884c\uff0c\u7279\u5225\u662f\u5728\u9032\u884c\u7bc4\u570d\u67e5\u8a62\u6642\u3002<\/p>\n<pre><code>CREATE INDEX idx_employee_name ON employees(name);<\/code><\/pre>\n<h3 id=\"2-2-%e4%bd%8d%e5%9c%96%e7%b4%a2%e5%bc%95-neMZMQXKpo\">2.2 \u4f4d\u5716\u7d22\u5f15<\/h3>\n<p>\u4f4d\u5716\u7d22\u5f15\u9069\u5408\u65bc\u4f4e\u57fa\u6578\u7684\u5217\uff0c\u4f8b\u5982\u6027\u5225\u6216\u72c0\u614b\u7b49\u3002\u5b83\u4f7f\u7528\u4f4d\u5716\u4f86\u8868\u793a\u6bcf\u500b\u503c\u7684\u5b58\u5728\u6027\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\u3002<\/p>\n<pre><code>CREATE BITMAP INDEX idx_employee_gender ON employees(gender);<\/code><\/pre>\n<h3 id=\"2-3-%e5%8f%8d%e5%90%91%e7%b4%a2%e5%bc%95-neMZMQXKpo\">2.3 \u53cd\u5411\u7d22\u5f15<\/h3>\n<p>\u53cd\u5411\u7d22\u5f15\u4e3b\u8981\u7528\u65bc\u8655\u7406\u9ad8\u57fa\u6578\u7684\u5217\uff0c\u7279\u5225\u662f\u5728\u67d0\u4e9b\u7279\u5b9a\u7684\u67e5\u8a62\u5834\u666f\u4e2d\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6027\u80fd\u3002<\/p>\n<pre><code>CREATE INDEX idx_reverse ON employees(name DESC);<\/code><\/pre>\n<h2 id=\"3-%e7%b4%a2%e5%bc%95%e7%9a%84%e7%b6%ad%e8%ad%b7-neMZMQXKpo\">3. \u7d22\u5f15\u7684\u7dad\u8b77<\/h2>\n<p>\u7d22\u5f15\u7684\u7dad\u8b77\u540c\u6a23\u91cd\u8981\u3002\u96a8\u8457\u6578\u64da\u7684\u589e\u9577\u548c\u8b8a\u5316\uff0c\u7d22\u5f15\u53ef\u80fd\u6703\u8b8a\u5f97\u4e0d\u518d\u9ad8\u6548\u3002\u5b9a\u671f\u91cd\u5efa\u548c\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\u53ef\u4ee5\u5e6b\u52a9\u4fdd\u6301\u7d22\u5f15\u7684\u6027\u80fd\u3002<\/p>\n<ul>\n<li><strong>\u91cd\u5efa\u7d22\u5f15\uff1a<\/strong>\u7576\u7d22\u5f15\u7684\u788e\u7247\u7387\u904e\u9ad8\u6642\uff0c\u53ef\u4ee5\u8003\u616e\u91cd\u5efa\u7d22\u5f15\u3002<\/li>\n<li><strong>\u6536\u96c6\u7d71\u8a08\u4fe1\u606f\uff1a<\/strong>\u4f7f\u7528DBMS_STATS\u5305\u4f86\u6536\u96c6\u8868\u548c\u7d22\u5f15\u7684\u7d71\u8a08\u4fe1\u606f\uff0c\u4ee5\u4fbf\u512a\u5316\u67e5\u8a62\u8a08\u5283\u3002<\/li>\n<\/ul>\n<h2 id=\"4-%e6%9f%a5%e8%a9%a2%e5%84%aa%e5%8c%96-neMZMQXKpo\">4. \u67e5\u8a62\u512a\u5316<\/h2>\n<p>\u9664\u4e86\u8868\u548c\u7d22\u5f15\u7684\u8a2d\u8a08\u5916\uff0c\u67e5\u8a62\u7684\u512a\u5316\u4e5f\u662f\u63d0\u9ad8\u6027\u80fd\u7684\u95dc\u9375\u3002\u4f7f\u7528EXPLAIN PLAN\u4f86\u5206\u6790\u67e5\u8a62\u8a08\u5283\uff0c\u4e26\u6839\u64da\u9700\u8981\u8abf\u6574\u7d22\u5f15\u6216\u67e5\u8a62\u8a9e\u53e5\u3002<\/p>\n<pre><code>EXPLAIN PLAN FOR SELECT * FROM employees WHERE name = 'John';<\/code><\/pre>\n<h2 id=\"%e7%b8%bd%e7%b5%90-neMZMQXKpo\">\u7e3d\u7d50<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u8868\u8207\u7d22\u5f15\u7684\u8a2d\u8a08\u5c0d\u65bc\u6027\u80fd\u7684\u5f71\u97ff\u4e0d\u5bb9\u5ffd\u8996\u3002\u901a\u904e\u5408\u7406\u7684\u8868\u8a2d\u8a08\u3001\u9078\u64c7\u5408\u9069\u7684\u7d22\u5f15\u985e\u578b\u4ee5\u53ca\u5b9a\u671f\u7dad\u8b77\u7d22\u5f15\uff0c\u53ef\u4ee5\u986f\u8457\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u67e5\u8a62\u6027\u80fd\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u6578\u64da\u5eab\u89e3\u6c7a\u65b9\u6848\u7684\u4f01\u696d\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u6216 <a href=\"https:\/\/server.hk\">\u9999\u6e2f\u4f3a\u670d\u5668<\/a> \u4f86\u904b\u884cOracle\u6578\u64da\u5eab\u4e5f\u662f\u4e00\u500b\u91cd\u8981\u7684\u8003\u91cf\u3002\u5e0c\u671b\u672c\u6587\u80fd\u70ba\u60a8\u5728Oracle\u6578\u64da\u5eab\u7684\u6027\u80fd\u512a\u5316\u4e0a\u63d0\u4f9b\u4e00\u4e9b\u6709\u50f9\u503c\u7684\u898b\u89e3\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u4e2d\u8868\u8207\u7d22\u5f15\u7684\u6027\u80fd\u512a\u5316\u65b9\u6848\uff0c\u63d0\u5347\u67e5\u8a62\u6548\u7387\u8207\u6578\u64da\u7ba1\u7406\u80fd\u529b\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-95592","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95592","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=95592"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95592\/revisions"}],"predecessor-version":[{"id":95593,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95592\/revisions\/95593"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95592"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95592"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95592"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}