{"id":95728,"date":"2024-10-20T03:29:20","date_gmt":"2024-10-19T19:29:20","guid":{"rendered":"https:\/\/server.hk\/cnblog\/95728\/"},"modified":"2024-10-20T03:29:21","modified_gmt":"2024-10-19T19:29:21","slug":"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b2%be%e7%b0%a1%e4%b9%8b%e7%ad%96%ef%bc%8c%e5%8f%aa%e7%95%99%e5%bf%85%e8%a6%81%e7%9a%84%e5%be%8c30%e8%90%ac%e6%a2%9d%e6%95%b8%e6%93%9a-oracle%e5%be%8c30%e8%90%ac","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/95728\/","title":{"rendered":"Oracle\u6578\u64da\u5eab\u7cbe\u7c21\u4e4b\u7b56\uff0c\u53ea\u7559\u5fc5\u8981\u7684\u5f8c30\u842c\u689d\u6578\u64da (oracle\u5f8c30\u842c\u689d\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 id=\"oracle%e6%95%b8%e6%93%9a%e5%ba%ab%e7%b2%be%e7%b0%a1%e4%b9%8b%e7%ad%96%ef%bc%8c%e5%8f%aa%e7%95%99%e5%bf%85%e8%a6%81%e7%9a%84%e5%be%8c30%e8%90%ac%e6%a2%9d%e6%95%b8%e6%93%9a-AeUqWxmFCx\">Oracle\u6578\u64da\u5eab\u7cbe\u7c21\u4e4b\u7b56\uff0c\u53ea\u7559\u5fc5\u8981\u7684\u5f8c30\u842c\u689d\u6578\u64da<\/h1>\n<p>\u5728\u7576\u4eca\u6578\u64da\u9a45\u52d5\u7684\u4e16\u754c\u4e2d\uff0c\u6578\u64da\u5eab\u7684\u7ba1\u7406\u8207\u512a\u5316\u8b8a\u5f97\u6108\u52a0\u91cd\u8981\u3002Oracle\u6578\u64da\u5eab\u4f5c\u70ba\u4e00\u500b\u5f37\u5927\u7684\u6578\u64da\u7ba1\u7406\u7cfb\u7d71\uff0c\u63d0\u4f9b\u4e86\u591a\u7a2e\u5de5\u5177\u548c\u7b56\u7565\u4f86\u5e6b\u52a9\u7528\u6236\u6709\u6548\u5730\u7ba1\u7406\u6578\u64da\u3002\u672c\u6587\u5c07\u63a2\u8a0e\u5982\u4f55\u7cbe\u7c21Oracle\u6578\u64da\u5eab\uff0c\u53ea\u4fdd\u7559\u5fc5\u8981\u7684\u5f8c30\u842c\u689d\u6578\u64da\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u5be6\u7528\u7684\u6280\u5de7\u548c\u793a\u4f8b\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bd%95%e9%9c%80%e8%a6%81%e7%b2%be%e7%b0%a1%e6%95%b8%e6%93%9a%e5%ba%ab-AeUqWxmFCx\">\u70ba\u4f55\u9700\u8981\u7cbe\u7c21\u6578\u64da\u5eab<\/h2>\n<p>\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0c\u6578\u64da\u5eab\u4e2d\u53ef\u80fd\u6703\u7a4d\u7d2f\u5927\u91cf\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002\u9019\u4e9b\u5197\u9918\u6578\u64da\u4e0d\u50c5\u4f54\u7528\u5b58\u5132\u7a7a\u9593\uff0c\u9084\u53ef\u80fd\u5f71\u97ff\u6578\u64da\u5eab\u7684\u6027\u80fd\u3002\u7cbe\u7c21\u6578\u64da\u5eab\u7684\u4e3b\u8981\u539f\u56e0\u5305\u62ec\uff1a<\/p>\n<ul>\n<li>\u63d0\u9ad8\u67e5\u8a62\u6027\u80fd\uff1a\u6e1b\u5c11\u6578\u64da\u91cf\u53ef\u4ee5\u52a0\u5feb\u67e5\u8a62\u901f\u5ea6\u3002<\/li>\n<li>\u964d\u4f4e\u5b58\u5132\u6210\u672c\uff1a\u7cbe\u7c21\u5f8c\u7684\u6578\u64da\u5eab\u9700\u8981\u66f4\u5c11\u7684\u5b58\u5132\u7a7a\u9593\u3002<\/li>\n<li>\u7c21\u5316\u6578\u64da\u7ba1\u7406\uff1a\u66f4\u5c11\u7684\u6578\u64da\u610f\u5473\u8457\u66f4\u5bb9\u6613\u9032\u884c\u7dad\u8b77\u548c\u7ba1\u7406\u3002<\/li>\n<\/ul>\n<h2 id=\"%e5%a6%82%e4%bd%95%e7%b2%be%e7%b0%a1oracle%e6%95%b8%e6%93%9a%e5%ba%ab-AeUqWxmFCx\">\u5982\u4f55\u7cbe\u7c21Oracle\u6578\u64da\u5eab<\/h2>\n<p>\u7cbe\u7c21Oracle\u6578\u64da\u5eab\u7684\u904e\u7a0b\u53ef\u4ee5\u5206\u70ba\u5e7e\u500b\u6b65\u9a5f\u3002\u4ee5\u4e0b\u662f\u4e00\u4e9b\u5177\u9ad4\u7684\u64cd\u4f5c\u5efa\u8b70\uff1a<\/p>\n<h3 id=\"1-%e7%a2%ba%e5%ae%9a%e4%bf%9d%e7%95%99%e7%9a%84%e6%95%b8%e6%93%9a%e7%af%84%e5%9c%8d-AeUqWxmFCx\">1. \u78ba\u5b9a\u4fdd\u7559\u7684\u6578\u64da\u7bc4\u570d<\/h3>\n<p>\u9996\u5148\uff0c\u60a8\u9700\u8981\u78ba\u5b9a\u54ea\u4e9b\u6578\u64da\u662f\u5fc5\u8981\u7684\u3002\u9019\u901a\u5e38\u53d6\u6c7a\u65bc\u696d\u52d9\u9700\u6c42\u548c\u6578\u64da\u4f7f\u7528\u60c5\u6cc1\u3002\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u67e5\u8a62\u4f86\u7372\u53d6\u6578\u64da\u7684\u7e3d\u6578\uff1a<\/p>\n<pre><code>SELECT COUNT(*) FROM your_table;<\/code><\/pre>\n<p>\u63a5\u8457\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u67e5\u8a62\u4f86\u9078\u64c7\u6700\u5f8c30\u842c\u689d\u6578\u64da\uff1a<\/p>\n<pre><code>SELECT * FROM your_table ORDER BY your_date_column DESC FETCH FIRST 300000 ROWS ONLY;<\/code><\/pre>\n<h3 id=\"2-%e5%88%aa%e9%99%a4%e4%b8%8d%e5%bf%85%e8%a6%81%e7%9a%84%e6%95%b8%e6%93%9a-AeUqWxmFCx\">2. \u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da<\/h3>\n<p>\u4e00\u65e6\u78ba\u5b9a\u4e86\u9700\u8981\u4fdd\u7559\u7684\u6578\u64da\uff0c\u60a8\u53ef\u4ee5\u4f7f\u7528DELETE\u8a9e\u53e5\u4f86\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELETE FROM your_table WHERE your_primary_key NOT IN (SELECT your_primary_key FROM (SELECT your_primary_key FROM your_table ORDER BY your_date_column DESC FETCH FIRST 300000 ROWS ONLY));<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u67e5\u8a62\u5c07\u522a\u9664\u6240\u6709\u4e0d\u5728\u6700\u5f8c30\u842c\u689d\u6578\u64da\u4e2d\u7684\u8a18\u9304\u3002<\/p>\n<h3 id=\"3-%e5%84%aa%e5%8c%96%e6%95%b8%e6%93%9a%e5%ba%ab-AeUqWxmFCx\">3. \u512a\u5316\u6578\u64da\u5eab<\/h3>\n<p>\u5728\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u5f8c\uff0c\u5efa\u8b70\u57f7\u884c\u6578\u64da\u5eab\u512a\u5316\u64cd\u4f5c\uff0c\u4ee5\u91cb\u653e\u7a7a\u9593\u4e26\u63d0\u9ad8\u6027\u80fd\u3002\u53ef\u4ee5\u4f7f\u7528\u4ee5\u4e0b\u547d\u4ee4\u4f86\u6536\u7e2e\u6578\u64da\u5eab\uff1a<\/p>\n<pre><code>ALTER TABLE your_table ENABLE ROW MOVEMENT; \nDBMS_SPACE.SPACE_USAGE(your_table); \nALTER TABLE your_table SHRINK SPACE;<\/code><\/pre>\n<h2 id=\"%e6%b3%a8%e6%84%8f%e4%ba%8b%e9%a0%85-AeUqWxmFCx\">\u6ce8\u610f\u4e8b\u9805<\/h2>\n<p>\u5728\u9032\u884c\u6578\u64da\u522a\u9664\u548c\u512a\u5316\u64cd\u4f5c\u6642\uff0c\u8acb\u52d9\u5fc5\u5099\u4efd\u6578\u64da\u5eab\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u6578\u64da\u4e1f\u5931\u3002\u6b64\u5916\uff0c\u5efa\u8b70\u5728\u4f4e\u5cf0\u6642\u6bb5\u9032\u884c\u9019\u4e9b\u64cd\u4f5c\uff0c\u4ee5\u6e1b\u5c11\u5c0d\u696d\u52d9\u904b\u884c\u7684\u5f71\u97ff\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-AeUqWxmFCx\">\u7d50\u8ad6<\/h2>\n<p>\u7cbe\u7c21Oracle\u6578\u64da\u5eab\u53ea\u4fdd\u7559\u5fc5\u8981\u7684\u5f8c30\u842c\u689d\u6578\u64da\u662f\u4e00\u500b\u6709\u6548\u7684\u6578\u64da\u7ba1\u7406\u7b56\u7565\u3002\u901a\u904e\u78ba\u5b9a\u4fdd\u7559\u7684\u6578\u64da\u7bc4\u570d\u3001\u522a\u9664\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u4ee5\u53ca\u512a\u5316\u6578\u64da\u5eab\uff0c\u60a8\u53ef\u4ee5\u63d0\u9ad8\u6578\u64da\u5eab\u7684\u6027\u80fd\u548c\u7ba1\u7406\u6548\u7387\u3002\u9019\u4e0d\u50c5\u80fd\u5920\u964d\u4f4e\u5b58\u5132\u6210\u672c\uff0c\u9084\u80fd\u63d0\u5347\u67e5\u8a62\u901f\u5ea6\uff0c\u70ba\u696d\u52d9\u904b\u884c\u63d0\u4f9b\u66f4\u597d\u7684\u652f\u6301\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc\u6578\u64da\u5eab\u7ba1\u7406\u548c\u512a\u5316\u7684\u8cc7\u8a0a\uff0c\u60a8\u53ef\u4ee5\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\uff0c\u63a2\u7d22\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">VPS<\/a> \u89e3\u6c7a\u65b9\u6848\uff0c\u5e6b\u52a9\u60a8\u5728\u9999\u6e2f\u7684\u6578\u64da\u7ba1\u7406\u4e2d\u7372\u5f97\u6700\u4f73\u6027\u80fd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u63a2\u7d22Oracle\u6578\u64da\u5eab\u7cbe\u7c21\u7b56\u7565\uff0c\u50c5\u4fdd\u7559\u5fc5\u8981\u7684\u5f8c30\u842c\u689d\u6578\u64da\uff0c\u63d0\u5347\u6027\u80fd\u8207\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-95728","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95728","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=95728"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95728\/revisions"}],"predecessor-version":[{"id":95729,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/95728\/revisions\/95729"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=95728"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=95728"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=95728"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}