{"id":96284,"date":"2024-10-20T08:08:19","date_gmt":"2024-10-20T00:08:19","guid":{"rendered":"https:\/\/server.hk\/cnblog\/96284\/"},"modified":"2024-10-20T08:08:19","modified_gmt":"2024-10-20T00:08:19","slug":"oracle%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e5%a6%82%e4%bd%95%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/96284\/","title":{"rendered":"Oracle\u81ea\u5b9a\u7fa9\u51fd\u6578\u5982\u4f55\u57f7\u884c\u6642\u9593"},"content":{"rendered":"<h1 id=\"oracle%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e5%a6%82%e4%bd%95%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93-kJboYGOyzb\">Oracle\u81ea\u5b9a\u7fa9\u51fd\u6578\u5982\u4f55\u57f7\u884c\u6642\u9593<\/h1>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5be6\u73fe\u7279\u5b9a\u7684\u696d\u52d9\u908f\u8f2f\u3002\u9019\u4e9b\u51fd\u6578\u4e0d\u50c5\u53ef\u4ee5\u63d0\u9ad8\u4ee3\u78bc\u7684\u91cd\u7528\u6027\uff0c\u9084\u80fd\u7c21\u5316\u8907\u96dc\u7684\u67e5\u8a62\u3002\u7136\u800c\uff0c\u96a8\u8457\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u4f7f\u7528\u983b\u7387\u589e\u52a0\uff0c\u5982\u4f55\u6709\u6548\u5730\u6e2c\u91cf\u548c\u512a\u5316\u9019\u4e9b\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u6210\u70ba\u4e86\u4e00\u500b\u91cd\u8981\u7684\u8ab2\u984c\u3002<\/p>\n<h2 id=\"%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%ba%e6%9c%ac%e6%a6%82%e5%bf%b5-kJboYGOyzb\">\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57fa\u672c\u6982\u5ff5<\/h2>\n<p>\u81ea\u5b9a\u7fa9\u51fd\u6578\u662f\u7528PL\/SQL\u8a9e\u8a00\u7de8\u5beb\u7684\uff0c\u4e26\u4e14\u53ef\u4ee5\u5728SQL\u67e5\u8a62\u4e2d\u88ab\u8abf\u7528\u3002\u9019\u4e9b\u51fd\u6578\u53ef\u4ee5\u63a5\u53d7\u53c3\u6578\u4e26\u8fd4\u56de\u4e00\u500b\u503c\uff0c\u901a\u5e38\u7528\u65bc\u8a08\u7b97\u3001\u6578\u64da\u8f49\u63db\u6216\u696d\u52d9\u908f\u8f2f\u7684\u5be6\u73fe\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u7c21\u55ae\u7684\u81ea\u5b9a\u7fa9\u51fd\u6578\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>CREATE OR REPLACE FUNCTION calculate_discount(price NUMBER, discount_rate NUMBER) \nRETURN NUMBER IS\nBEGIN\n    RETURN price * (1 - discount_rate);\nEND;\n<\/code><\/pre>\n<h2 id=\"%e6%b8%ac%e9%87%8f%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93%e7%9a%84%e6%96%b9%e6%b3%95-kJboYGOyzb\">\u6e2c\u91cf\u57f7\u884c\u6642\u9593\u7684\u65b9\u6cd5<\/h2>\n<p>\u5728Oracle\u4e2d\uff0c\u6709\u5e7e\u7a2e\u65b9\u6cd5\u53ef\u4ee5\u6e2c\u91cf\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u7528\u7684\u65b9\u6cd5\uff1a<\/p>\n<h3 id=\"1-%e4%bd%bf%e7%94%a8dbms_utility%e5%8c%85-kJboYGOyzb\">1. \u4f7f\u7528DBMS_UTILITY\u5305<\/h3>\n<p>Oracle\u63d0\u4f9b\u4e86DBMS_UTILITY\u5305\uff0c\u9019\u662f\u4e00\u500b\u5167\u5efa\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4f86\u6e2c\u91cf\u57f7\u884c\u6642\u9593\u3002\u4ee5\u4e0b\u662f\u5982\u4f55\u4f7f\u7528\u5b83\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>DECLARE\n    start_time NUMBER;\n    end_time NUMBER;\n    result NUMBER;\nBEGIN\n    DBMS_UTILITY.GET_TIME(start_time);\n    \n    result := calculate_discount(100, 0.1);\n    \n    DBMS_UTILITY.GET_TIME(end_time);\n    \n    DBMS_OUTPUT.PUT_LINE('\u57f7\u884c\u6642\u9593: ' || (end_time - start_time) || ' \u79d2');\nEND;\n<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8sql-trace%e5%92%8ctkprof-kJboYGOyzb\">2. \u4f7f\u7528SQL Trace\u548cTKPROF<\/h3>\n<p>SQL Trace\u662f\u4e00\u7a2e\u5f37\u5927\u7684\u5de5\u5177\uff0c\u53ef\u4ee5\u7528\u4f86\u6355\u7372SQL\u8a9e\u53e5\u7684\u57f7\u884c\u8a08\u5283\u548c\u57f7\u884c\u6642\u9593\u3002\u4f7f\u7528TKPROF\u53ef\u4ee5\u5c07\u9019\u4e9b\u6578\u64da\u683c\u5f0f\u5316\u70ba\u53ef\u8b80\u7684\u5831\u544a\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528SQL Trace\u7684\u57fa\u672c\u6b65\u9a5f\uff1a<\/p>\n<ul>\n<li>\u555f\u7528SQL Trace\uff1a<\/li>\n<pre><code>ALTER SESSION SET SQL_TRACE = TRUE;<\/code><\/pre>\n<li>\u57f7\u884c\u4f60\u7684\u81ea\u5b9a\u7fa9\u51fd\u6578\uff1a<\/li>\n<pre><code>SELECT calculate_discount(100, 0.1) FROM dual;<\/code><\/pre>\n<li>\u7981\u7528SQL Trace\uff1a<\/li>\n<pre><code>ALTER SESSION SET SQL_TRACE = FALSE;<\/code><\/pre>\n<li>\u4f7f\u7528TKPROF\u751f\u6210\u5831\u544a\u3002<\/li>\n<\/ul>\n<h3 id=\"3-%e4%bd%bf%e7%94%a8explain-plan-kJboYGOyzb\">3. \u4f7f\u7528EXPLAIN PLAN<\/h3>\n<p>EXPLAIN PLAN\u53ef\u4ee5\u5e6b\u52a9\u958b\u767c\u8005\u4e86\u89e3SQL\u67e5\u8a62\u7684\u57f7\u884c\u8a08\u5283\uff0c\u96d6\u7136\u5b83\u4e0d\u76f4\u63a5\u63d0\u4f9b\u57f7\u884c\u6642\u9593\uff0c\u4f46\u53ef\u4ee5\u5e6b\u52a9\u8b58\u5225\u6f5b\u5728\u7684\u6027\u80fd\u74f6\u9838\u3002\u4ee5\u4e0b\u662f\u4f7f\u7528EXPLAIN PLAN\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>EXPLAIN PLAN FOR \nSELECT calculate_discount(100, 0.1) FROM dual;\nSELECT * FROM TABLE(DBMS_XPLAN.DISPLAY);\n<\/code><\/pre>\n<h2 id=\"%e5%84%aa%e5%8c%96%e8%87%aa%e5%ae%9a%e7%be%a9%e5%87%bd%e6%95%b8%e7%9a%84%e5%9f%b7%e8%a1%8c%e6%99%82%e9%96%93-kJboYGOyzb\">\u512a\u5316\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593<\/h2>\n<p>\u5728\u6e2c\u91cf\u4e86\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u5f8c\uff0c\u63a5\u4e0b\u4f86\u7684\u6b65\u9a5f\u662f\u512a\u5316\u5b83\u5011\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u512a\u5316\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u907f\u514d\u4e0d\u5fc5\u8981\u7684\u8a08\u7b97\uff1a<\/strong>\u78ba\u4fdd\u51fd\u6578\u5167\u90e8\u7684\u8a08\u7b97\u662f\u5fc5\u8981\u7684\uff0c\u907f\u514d\u91cd\u8907\u8a08\u7b97\u3002<\/li>\n<li><strong>\u4f7f\u7528PL\/SQL\u96c6\u5408\uff1a<\/strong>\u5982\u679c\u9700\u8981\u8655\u7406\u5927\u91cf\u6578\u64da\uff0c\u8003\u616e\u4f7f\u7528PL\/SQL\u96c6\u5408\u4f86\u63d0\u9ad8\u6027\u80fd\u3002<\/li>\n<li><strong>\u7c21\u5316\u908f\u8f2f\uff1a<\/strong>\u6aa2\u67e5\u51fd\u6578\u5167\u90e8\u7684\u908f\u8f2f\uff0c\u78ba\u4fdd\u5176\u7c21\u6f54\u660e\u4e86\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b8%bd%e7%b5%90-kJboYGOyzb\">\u7e3d\u7d50<\/h2>\n<p>\u81ea\u5b9a\u7fa9\u51fd\u6578\u5728Oracle\u6578\u64da\u5eab\u4e2d\u626e\u6f14\u8457\u91cd\u8981\u7684\u89d2\u8272\uff0c\u80fd\u5920\u5e6b\u52a9\u958b\u767c\u8005\u5be6\u73fe\u8907\u96dc\u7684\u696d\u52d9\u908f\u8f2f\u3002\u901a\u904e\u4f7f\u7528DBMS_UTILITY\u5305\u3001SQL Trace\u548cEXPLAIN PLAN\u7b49\u5de5\u5177\uff0c\u958b\u767c\u8005\u53ef\u4ee5\u6709\u6548\u5730\u6e2c\u91cf\u548c\u512a\u5316\u9019\u4e9b\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6548\u80fd\u7684\u61c9\u7528\uff0c\u512a\u5316\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u57f7\u884c\u6642\u9593\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002<\/p>\n<p>\u5982\u679c\u60a8\u6b63\u5728\u5c0b\u627e\u9ad8\u6548\u80fd\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0cServer.HK \u63d0\u4f9b\u591a\u7a2e\u9078\u64c7\uff0c\u6eff\u8db3\u60a8\u7684\u9700\u6c42\u3002\u7121\u8ad6\u662f <a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a> \u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u70ba\u60a8\u63d0\u4f9b\u652f\u6301\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u5728Oracle\u4e2d\u57f7\u884c\u81ea\u5b9a\u7fa9\u51fd\u6578\u7684\u6642\u9593\uff0c\u63d0\u5347\u6027\u80fd\u8207\u6548\u7387\uff0c\u512a\u5316\u6578\u64da\u8655\u7406\u904e\u7a0b\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-96284","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96284","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=96284"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96284\/revisions"}],"predecessor-version":[{"id":96285,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/96284\/revisions\/96285"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=96284"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=96284"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=96284"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}