{"id":185478,"date":"2024-11-10T21:53:18","date_gmt":"2024-11-10T13:53:18","guid":{"rendered":"https:\/\/server.hk\/cnblog\/185478\/"},"modified":"2024-11-10T21:53:19","modified_gmt":"2024-11-10T13:53:19","slug":"%e4%bd%bf%e7%94%a8%e8%a6%96%e5%9c%96%e5%bf%ab%e9%80%9f%e7%8d%b2%e5%be%97flashback-query%e9%96%83%e5%9b%9e%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/185478\/","title":{"rendered":"\u4f7f\u7528\u8996\u5716\u5feb\u901f\u7372\u5f97Flashback Query\u9583\u56de\u67e5\u8a62\u6578\u64da"},"content":{"rendered":"<h1 id=\"%e4%bd%bf%e7%94%a8%e8%a6%96%e5%9c%96%e5%bf%ab%e9%80%9f%e7%8d%b2%e5%be%97flashback-query%e9%96%83%e5%9b%9e%e6%9f%a5%e8%a9%a2%e6%95%b8%e6%93%9a-JVEKtUnvGi\">\u4f7f\u7528\u8996\u5716\u5feb\u901f\u7372\u5f97Flashback Query\u9583\u56de\u67e5\u8a62\u6578\u64da<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u6578\u64da\u7684\u5b8c\u6574\u6027\u548c\u53ef\u7528\u6027\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u96a8\u8457\u696d\u52d9\u9700\u6c42\u7684\u8b8a\u5316\uff0c\u6578\u64da\u7684\u67e5\u8a62\u548c\u6062\u5fa9\u8b8a\u5f97\u8d8a\u4f86\u8d8a\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u63d0\u4f9b\u4e86\u4e00\u7a2e\u540d\u70baFlashback Query\u7684\u529f\u80fd\uff0c\u5141\u8a31\u7528\u6236\u67e5\u770b\u904e\u53bb\u67d0\u4e00\u6642\u9593\u9ede\u7684\u6578\u64da\u72c0\u614b\u3002\u9019\u5c0d\u65bc\u6578\u64da\u6062\u5fa9\u548c\u932f\u8aa4\u4fee\u6b63\u975e\u5e38\u6709\u5e6b\u52a9\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u4f7f\u7528\u8996\u5716\u4f86\u5feb\u901f\u7372\u5f97Flashback Query\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"%e4%bb%80%e9%ba%bc%e6%98%afflashback-query%ef%bc%9f-JVEKtUnvGi\">\u4ec0\u9ebc\u662fFlashback Query\uff1f<\/h2>\n<p>Flashback Query\u662f\u4e00\u7a2eOracle\u6578\u64da\u5eab\u529f\u80fd\uff0c\u5141\u8a31\u7528\u6236\u67e5\u8a62\u5728\u7279\u5b9a\u6642\u9593\u9ede\u7684\u6578\u64da\u3002\u9019\u610f\u5473\u8457\u7528\u6236\u53ef\u4ee5\u67e5\u770b\u5728\u67d0\u500b\u6642\u9593\u4e4b\u524d\u7684\u6578\u64da\u72c0\u614b\uff0c\u800c\u4e0d\u9700\u8981\u9032\u884c\u5b8c\u6574\u7684\u6578\u64da\u6062\u5fa9\u3002\u9019\u5c0d\u65bc\u8aa4\u522a\u9664\u6216\u8aa4\u66f4\u65b0\u6578\u64da\u7684\u60c5\u6cc1\u7279\u5225\u6709\u7528\u3002<\/p>\n<h2 id=\"flashback-query%e7%9a%84%e5%9f%ba%e6%9c%ac%e8%aa%9e%e6%b3%95-JVEKtUnvGi\">Flashback Query\u7684\u57fa\u672c\u8a9e\u6cd5<\/h2>\n<p>\u4f7f\u7528Flashback Query\u7684\u57fa\u672c\u8a9e\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre><code>SELECT * FROM table_name AS OF TIMESTAMP (SYSTIMESTAMP - INTERVAL 'n' MINUTE);<\/code><\/pre>\n<p>\u5728\u9019\u88e1\uff0c`table_name`\u662f\u8981\u67e5\u8a62\u7684\u8868\u540d\uff0c`n`\u662f\u8981\u56de\u6eaf\u7684\u5206\u9418\u6578\u3002\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u67e5\u770b10\u5206\u9418\u524d\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\uff1a<\/p>\n<pre><code>SELECT * FROM employees AS OF TIMESTAMP (SYSTIMESTAMP - INTERVAL '10' MINUTE);<\/code><\/pre>\n<h2 id=\"%e4%bd%bf%e7%94%a8%e8%a6%96%e5%9c%96%e4%be%86%e7%b0%a1%e5%8c%96flashback-query-JVEKtUnvGi\">\u4f7f\u7528\u8996\u5716\u4f86\u7c21\u5316Flashback Query<\/h2>\n<p>\u8996\u5716\u662f\u4e00\u7a2e\u865b\u64ec\u8868\uff0c\u53ef\u4ee5\u7c21\u5316\u6578\u64da\u67e5\u8a62\u7684\u904e\u7a0b\u3002\u901a\u904e\u5275\u5efa\u4e00\u500b\u8996\u5716\uff0c\u60a8\u53ef\u4ee5\u5c07Flashback Query\u7684\u908f\u8f2f\u5c01\u88dd\u5728\u8996\u5716\u4e2d\uff0c\u5f9e\u800c\u4f7f\u67e5\u8a62\u8b8a\u5f97\u66f4\u52a0\u7c21\u55ae\u548c\u76f4\u89c0\u3002<\/p>\n<h3 id=\"%e5%89%b5%e5%bb%ba%e8%a6%96%e5%9c%96%e7%9a%84%e6%ad%a5%e9%a9%9f-JVEKtUnvGi\">\u5275\u5efa\u8996\u5716\u7684\u6b65\u9a5f<\/h3>\n<ol>\n<li>\u9996\u5148\uff0c\u60a8\u9700\u8981\u78ba\u5b9a\u8981\u67e5\u8a62\u7684\u8868\u548c\u6642\u9593\u7bc4\u570d\u3002<\/li>\n<li>\u7136\u5f8c\uff0c\u4f7f\u7528Flashback Query\u5275\u5efa\u4e00\u500b\u8996\u5716\u3002<\/li>\n<li>\u6700\u5f8c\uff0c\u901a\u904e\u67e5\u8a62\u8a72\u8996\u5716\u4f86\u7372\u53d6\u6240\u9700\u7684\u6578\u64da\u3002<\/li>\n<\/ol>\n<h3 id=\"%e7%a4%ba%e4%be%8b%ef%bc%9a%e5%89%b5%e5%bb%ba%e4%b8%80%e5%80%8bflashback%e8%a6%96%e5%9c%96-JVEKtUnvGi\">\u793a\u4f8b\uff1a\u5275\u5efa\u4e00\u500bFlashback\u8996\u5716<\/h3>\n<p>\u5047\u8a2d\u6211\u5011\u6709\u4e00\u500b\u540d\u70ba`employees`\u7684\u8868\uff0c\u6211\u5011\u5e0c\u671b\u5275\u5efa\u4e00\u500b\u8996\u5716\u4f86\u67e5\u770b\u904e\u53bb30\u5206\u9418\u7684\u6578\u64da\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0bSQL\u8a9e\u53e5\u4f86\u5275\u5efa\u8996\u5716\uff1a<\/p>\n<pre><code>CREATE OR REPLACE VIEW employees_flashback AS\nSELECT * FROM employees AS OF TIMESTAMP (SYSTIMESTAMP - INTERVAL '30' MINUTE);<\/code><\/pre>\n<p>\u5275\u5efa\u8996\u5716\u5f8c\uff0c\u60a8\u53ef\u4ee5\u901a\u904e\u7c21\u55ae\u7684\u67e5\u8a62\u4f86\u7372\u53d6\u904e\u53bb30\u5206\u9418\u7684\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT * FROM employees_flashback;<\/code><\/pre>\n<h2 id=\"flashback-query%e7%9a%84%e5%84%aa%e5%8b%a2-JVEKtUnvGi\">Flashback Query\u7684\u512a\u52e2<\/h2>\n<ul>\n<li><strong>\u6578\u64da\u6062\u5fa9\uff1a<\/strong>\u80fd\u5920\u5feb\u901f\u6062\u5fa9\u8aa4\u522a\u9664\u6216\u8aa4\u66f4\u65b0\u7684\u6578\u64da\u3002<\/li>\n<li><strong>\u7c21\u5316\u67e5\u8a62\uff1a<\/strong>\u901a\u904e\u8996\u5716\u7c21\u5316\u67e5\u8a62\u904e\u7a0b\uff0c\u6e1b\u5c11\u932f\u8aa4\u7684\u53ef\u80fd\u6027\u3002<\/li>\n<li><strong>\u63d0\u9ad8\u6548\u7387\uff1a<\/strong>\u5feb\u901f\u7372\u53d6\u6b77\u53f2\u6578\u64da\uff0c\u652f\u6301\u696d\u52d9\u6c7a\u7b56\u3002<\/li>\n<\/ul>\n<h2 id=\"%e7%b5%90%e8%ab%96-JVEKtUnvGi\">\u7d50\u8ad6<\/h2>\n<p>Flashback Query\u662f\u4e00\u500b\u5f37\u5927\u7684\u5de5\u5177\uff0c\u80fd\u5920\u5e6b\u52a9\u7528\u6236\u5feb\u901f\u7372\u53d6\u6b77\u53f2\u6578\u64da\u3002\u901a\u904e\u4f7f\u7528\u8996\u5716\uff0c\u60a8\u53ef\u4ee5\u9032\u4e00\u6b65\u7c21\u5316\u67e5\u8a62\u904e\u7a0b\uff0c\u63d0\u9ad8\u6578\u64da\u6aa2\u7d22\u7684\u6548\u7387\u3002\u7121\u8ad6\u662f\u5728\u6578\u64da\u6062\u5fa9\u9084\u662f\u65e5\u5e38\u67e5\u8a62\u4e2d\uff0cFlashback Query\u90fd\u80fd\u63d0\u4f9b\u91cd\u8981\u7684\u652f\u6301\u3002<\/p>\n<p>\u5982\u679c\u60a8\u5c0d\u65bc\u5982\u4f55\u5728\u9999\u6e2f\u7684VPS\u74b0\u5883\u4e2d\u5be6\u65bd\u9019\u4e9b\u6280\u8853\u6709\u8208\u8da3\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u4e86\u89e3\u66f4\u591a\u8cc7\u8a0a\u3002\u7121\u8ad6\u662f<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u9084\u662f\u5176\u4ed6\u670d\u52d9\uff0c\u6211\u5011\u90fd\u80fd\u63d0\u4f9b\u5c08\u696d\u7684\u652f\u6301\u548c\u89e3\u6c7a\u65b9\u6848\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4f7f\u7528\u8996\u5716\u5feb\u901f\u7372\u5f97Flashback Query\u9583\u56de\u67e5\u8a62\u6578\u64da\uff0c\u8f15\u9b06\u6062\u5fa9\u904e\u53bb\u7684\u6578\u64da\u72c0\u614b\uff0c\u63d0\u5347\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-185478","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185478","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=185478"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185478\/revisions"}],"predecessor-version":[{"id":185479,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/185478\/revisions\/185479"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=185478"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=185478"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=185478"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}