{"id":95690,"date":"2024-10-20T03:10:17","date_gmt":"2024-10-19T19:10:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95690\/"},"modified":"2024-10-20T03:10:17","modified_gmt":"2024-10-19T19:10:17","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87%e7%9a%84%e6%a6%82%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95690\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u7de9\u885d\u5340\u547d\u4e2d\u7387\u7684\u6982\u8ff0"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87%e7%9a%84%e6%a6%82%e8%bf%b0-XpviLrfAHE\">Oracle\u6578\u64da\u5eab\u7de9\u885d\u5340\u547d\u4e2d\u7387\u7684\u6982\u8ff0<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u7de9\u885d\u5340\u547d\u4e2d\u7387\u662f\u4e00\u500b\u95dc\u9375\u6307\u6a19\uff0c\u7279\u5225\u662f\u5728Oracle\u6578\u64da\u5eab\u4e2d\u3002\u5b83\u53cd\u6620\u4e86\u6578\u64da\u5eab\u5728\u8655\u7406\u67e5\u8a62\u6642\uff0c\u80fd\u5920\u5f9e\u7de9\u885d\u5340\u4e2d\u76f4\u63a5\u7372\u53d6\u6578\u64da\u7684\u80fd\u529b\u3002\u9ad8\u7de9\u885d\u5340\u547d\u4e2d\u7387\u610f\u5473\u8457\u6578\u64da\u5eab\u80fd\u5920\u6709\u6548\u5730\u5229\u7528\u5167\u5b58\uff0c\u5f9e\u800c\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff0c\u6e1b\u5c11\u78c1\u789fI\/O\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%af%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87%ef%bc%9f-XpviLrfAHE\">\u4ec0\u9ebc\u662f\u7de9\u885d\u5340\u547d\u4e2d\u7387\uff1f<\/h2>\n<p>\u7de9\u885d\u5340\u547d\u4e2d\u7387\u662f\u6307\u5728\u67e5\u8a62\u904e\u7a0b\u4e2d\uff0c\u6578\u64da\u5eab\u5f9e\u7de9\u885d\u5340\u4e2d\u627e\u5230\u6240\u9700\u6578\u64da\u7684\u6bd4\u4f8b\u3002\u9019\u4e00\u6bd4\u4f8b\u53ef\u4ee5\u7528\u4ee5\u4e0b\u516c\u5f0f\u8a08\u7b97\uff1a<\/p>\n<pre><code>\u7de9\u885d\u5340\u547d\u4e2d\u7387 = (\u7de9\u885d\u5340\u547d\u4e2d\u6b21\u6578) \/ (\u7de9\u885d\u5340\u547d\u4e2d\u6b21\u6578 + \u7de9\u885d\u5340\u672a\u547d\u4e2d\u6b21\u6578)<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c\u7de9\u885d\u5340\u547d\u4e2d\u6b21\u6578\u662f\u6307\u6578\u64da\u5eab\u5728\u7de9\u885d\u5340\u4e2d\u627e\u5230\u6240\u9700\u6578\u64da\u7684\u6b21\u6578\uff0c\u800c\u7de9\u885d\u5340\u672a\u547d\u4e2d\u6b21\u6578\u5247\u662f\u6307\u6578\u64da\u5eab\u9700\u8981\u5f9e\u78c1\u789f\u4e2d\u8b80\u53d6\u6578\u64da\u7684\u6b21\u6578\u3002\u7406\u60f3\u7684\u60c5\u6cc1\u4e0b\uff0c\u7de9\u885d\u5340\u547d\u4e2d\u7387\u61c9\u8a72\u63a5\u8fd1100%\u3002<\/p>\n<h2 id=\"%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87%e7%9a%84%e9%87%8d%e8%a6%81%e6%80%a7-XpviLrfAHE\">\u7de9\u885d\u5340\u547d\u4e2d\u7387\u7684\u91cd\u8981\u6027<\/h2>\n<p>\u7de9\u885d\u5340\u547d\u4e2d\u7387\u5c0d\u65bc\u6578\u64da\u5eab\u6027\u80fd\u81f3\u95dc\u91cd\u8981\u3002\u7576\u547d\u4e2d\u7387\u9ad8\u6642\uff0c\u6578\u64da\u5eab\u80fd\u5920\u5feb\u901f\u97ff\u61c9\u67e5\u8a62\uff0c\u56e0\u70ba\u5b83\u4e0d\u9700\u8981\u983b\u7e41\u5730\u8a2a\u554f\u78c1\u789f\u3002\u9019\u4e0d\u50c5\u63d0\u9ad8\u4e86\u67e5\u8a62\u901f\u5ea6\uff0c\u9084\u6e1b\u5c11\u4e86\u78c1\u789f\u7684\u78e8\u640d\uff0c\u5ef6\u9577\u4e86\u786c\u9ad4\u7684\u4f7f\u7528\u58fd\u547d\u3002<\/p>\n<p>\u76f8\u53cd\uff0c\u4f4e\u7de9\u885d\u5340\u547d\u4e2d\u7387\u53ef\u80fd\u5c0e\u81f4\u6027\u80fd\u74f6\u9838\uff0c\u56e0\u70ba\u6578\u64da\u5eab\u9700\u8981\u82b1\u8cbb\u66f4\u591a\u6642\u9593\u5f9e\u78c1\u789f\u4e2d\u8b80\u53d6\u6578\u64da\u3002\u9019\u53ef\u80fd\u6703\u5f71\u97ff\u61c9\u7528\u7a0b\u5e8f\u7684\u97ff\u61c9\u6642\u9593\uff0c\u4e26\u5c0e\u81f4\u7528\u6236\u9ad4\u9a57\u4e0d\u4f73\u3002<\/p>\n<h2 id=\"%e5%a6%82%e4%bd%95%e6%8f%90%e9%ab%98%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87-XpviLrfAHE\">\u5982\u4f55\u63d0\u9ad8\u7de9\u885d\u5340\u547d\u4e2d\u7387<\/h2>\n<p>\u63d0\u9ad8\u7de9\u885d\u5340\u547d\u4e2d\u7387\u7684\u65b9\u6cd5\u6709\u5f88\u591a\uff0c\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5e38\u898b\u7684\u7b56\u7565\uff1a<\/p>\n<ul>\n<li><strong>\u8abf\u6574\u7de9\u885d\u5340\u5927\u5c0f\uff1a<\/strong>\u6839\u64da\u61c9\u7528\u7a0b\u5e8f\u7684\u9700\u6c42\uff0c\u9069\u7576\u8abf\u6574\u7de9\u885d\u5340\u7684\u5927\u5c0f\u53ef\u4ee5\u63d0\u9ad8\u547d\u4e2d\u7387\u3002\u904e\u5c0f\u7684\u7de9\u885d\u5340\u53ef\u80fd\u7121\u6cd5\u5bb9\u7d0d\u5e38\u7528\u6578\u64da\uff0c\u800c\u904e\u5927\u7684\u7de9\u885d\u5340\u5247\u53ef\u80fd\u6d6a\u8cbb\u5167\u5b58\u3002<\/li>\n<li><strong>\u512a\u5316\u67e5\u8a62\uff1a<\/strong>\u901a\u904e\u512a\u5316SQL\u67e5\u8a62\uff0c\u6e1b\u5c11\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u8b80\u53d6\uff0c\u53ef\u4ee5\u63d0\u9ad8\u7de9\u885d\u5340\u547d\u4e2d\u7387\u3002\u4f8b\u5982\uff0c\u4f7f\u7528\u7d22\u5f15\u4f86\u52a0\u901f\u67e5\u8a62\u3002<\/li>\n<li><strong>\u5b9a\u671f\u6e05\u7406\u7de9\u885d\u5340\uff1a<\/strong>\u5b9a\u671f\u6e05\u7406\u4e0d\u518d\u4f7f\u7528\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u91cb\u653e\u7de9\u885d\u5340\u7a7a\u9593\uff0c\u8b93\u66f4\u591a\u7684\u5e38\u7528\u6578\u64da\u9032\u5165\u7de9\u885d\u5340\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%9b%a3%e6%8e%a7%e7%b7%a9%e8%a1%9d%e5%8d%80%e5%91%bd%e4%b8%ad%e7%8e%87-XpviLrfAHE\">\u76e3\u63a7\u7de9\u885d\u5340\u547d\u4e2d\u7387<\/h2>\n<p>\u5728Oracle\u6578\u64da\u5eab\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u67e5\u8a62\u4f86\u76e3\u63a7\u7de9\u885d\u5340\u547d\u4e2d\u7387\uff1a<\/p>\n<pre><code>SELECT \n    (1 - (phy.value \/ (phy.value + lob.value))) * 100 AS \"Buffer Hit Ratio\"\nFROM \n    v$buffer_pool_statistics phy,\n    v$lob_statistics lob;<\/code><\/pre>\n<p>\u9019\u500b\u67e5\u8a62\u5c07\u8fd4\u56de\u7576\u524d\u7684\u7de9\u885d\u5340\u547d\u4e2d\u7387\uff0c\u5e6b\u52a9\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u8a55\u4f30\u6027\u80fd\u4e26\u9032\u884c\u76f8\u61c9\u7684\u8abf\u6574\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-XpviLrfAHE\">\u7d50\u8ad6<\/h2>\n<p>\u7de9\u885d\u5340\u547d\u4e2d\u7387\u662f\u8a55\u4f30Oracle\u6578\u64da\u5eab\u6027\u80fd\u7684\u91cd\u8981\u6307\u6a19\u3002\u901a\u904e\u7406\u89e3\u5176\u6982\u5ff5\u3001\u91cd\u8981\u6027\u4ee5\u53ca\u5982\u4f55\u63d0\u9ad8\u547d\u4e2d\u7387\uff0c\u6578\u64da\u5eab\u7ba1\u7406\u54e1\u53ef\u4ee5\u6709\u6548\u5730\u512a\u5316\u6578\u64da\u5eab\u6027\u80fd\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u7684\u9ad8\u6548\u904b\u884c\u3002\u5c0d\u65bc\u9700\u8981\u9ad8\u6027\u80fd\u7684\u61c9\u7528\uff0c\u9078\u64c7\u5408\u9069\u7684 <a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\u4e5f\u662f\u81f3\u95dc\u91cd\u8981\u7684\uff0c\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u6578\u64da\u5eab\u5728\u6700\u4f73\u74b0\u5883\u4e2d\u904b\u884c\uff0c\u9032\u4e00\u6b65\u63d0\u5347\u6574\u9ad4\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3Oracle\u6578\u64da\u5eab\u7de9\u885d\u5340\u547d\u4e2d\u7387\u7684\u6982\u5ff5\u3001\u5f71\u97ff\u56e0\u7d20\u53ca\u5176\u5c0d\u6027\u80fd\u7684\u95dc\u9375\u4f5c\u7528\uff0c\u63d0\u5347\u6578\u64da\u5eab\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-95690","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95690","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=95690"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95690\/revisions"}],"predecessor-version":[{"id":95691,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95690\/revisions\/95691"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95690"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95690"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95690"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}