{"id":162963,"date":"2024-11-04T19:30:21","date_gmt":"2024-11-04T11:30:21","guid":{"rendered":"https:\/\/server.hk\/cnblog\/162963\/"},"modified":"2024-11-04T19:30:22","modified_gmt":"2024-11-04T11:30:22","slug":"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%9c%a8db2%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e9%87%8f%e5%a4%a7%e7%9a%84%e8%a1%a8","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/162963\/","title":{"rendered":"\u6559\u60a8\u5982\u4f55\u5728DB2\u522a\u9664\u6578\u64da\u91cf\u5927\u7684\u8868"},"content":{"rendered":"<h1 id=\"%e6%95%99%e6%82%a8%e5%a6%82%e4%bd%95%e5%9c%a8db2%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a%e9%87%8f%e5%a4%a7%e7%9a%84%e8%a1%a8-dLnQAtdAzU\">\u6559\u60a8\u5982\u4f55\u5728DB2\u522a\u9664\u6578\u64da\u91cf\u5927\u7684\u8868<\/h1>\n<p>\u5728\u6578\u64da\u5eab\u7ba1\u7406\u4e2d\uff0c\u522a\u9664\u5927\u91cf\u6578\u64da\u662f\u4e00\u9805\u5e38\u898b\u7684\u4efb\u52d9\uff0c\u5c24\u5176\u662f\u5728\u4f7f\u7528IBM\u7684DB2\u6578\u64da\u5eab\u6642\u3002\u96a8\u8457\u6642\u9593\u7684\u63a8\u79fb\uff0c\u6578\u64da\u91cf\u7684\u589e\u9577\u53ef\u80fd\u6703\u5f71\u97ff\u7cfb\u7d71\u6027\u80fd\uff0c\u56e0\u6b64\u5b9a\u671f\u6e05\u7406\u4e0d\u5fc5\u8981\u7684\u6578\u64da\u662f\u975e\u5e38\u91cd\u8981\u7684\u3002\u672c\u6587\u5c07\u4ecb\u7d39\u5728DB2\u4e2d\u522a\u9664\u6578\u64da\u91cf\u5927\u7684\u8868\u7684\u5e7e\u7a2e\u65b9\u6cd5\uff0c\u4e26\u63d0\u4f9b\u4e00\u4e9b\u6700\u4f73\u5be6\u8e10\u5efa\u8b70\u3002<\/p>\n<h2 id=\"1-%e7%a2%ba%e8%aa%8d%e5%88%aa%e9%99%a4%e7%9a%84%e5%bf%85%e8%a6%81%e6%80%a7-dLnQAtdAzU\">1. \u78ba\u8a8d\u522a\u9664\u7684\u5fc5\u8981\u6027<\/h2>\n<p>\u5728\u9032\u884c\u4efb\u4f55\u522a\u9664\u64cd\u4f5c\u4e4b\u524d\uff0c\u9996\u5148\u9700\u8981\u78ba\u8a8d\u8a72\u8868\u4e2d\u7684\u6578\u64da\u662f\u5426\u771f\u7684\u4e0d\u518d\u9700\u8981\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u5e7e\u500b\u6b65\u9a5f\u4f86\u5be6\u73fe\uff1a<\/p>\n<ul>\n<li>\u6aa2\u67e5\u6578\u64da\u7684\u4f7f\u7528\u983b\u7387\uff1a\u5206\u6790\u8a72\u8868\u7684\u6578\u64da\u662f\u5426\u88ab\u983b\u7e41\u67e5\u8a62\u6216\u4f7f\u7528\u3002<\/li>\n<li>\u5099\u4efd\u6578\u64da\uff1a\u5728\u522a\u9664\u4e4b\u524d\uff0c\u5efa\u8b70\u5c0d\u8a72\u8868\u9032\u884c\u5099\u4efd\uff0c\u4ee5\u9632\u6b62\u610f\u5916\u4e1f\u5931\u91cd\u8981\u6578\u64da\u3002<\/li>\n<li>\u8a55\u4f30\u5f71\u97ff\uff1a\u8003\u616e\u522a\u9664\u8a72\u8868\u5f8c\u5c0d\u7cfb\u7d71\u548c\u61c9\u7528\u7a0b\u5e8f\u7684\u5f71\u97ff\u3002<\/li>\n<\/ul>\n<h2 id=\"2-%e4%bd%bf%e7%94%a8delete%e8%aa%9e%e5%8f%a5%e5%88%aa%e9%99%a4%e6%95%b8%e6%93%9a-dLnQAtdAzU\">2. \u4f7f\u7528DELETE\u8a9e\u53e5\u522a\u9664\u6578\u64da<\/h2>\n<p>\u5728DB2\u4e2d\uff0c\u6700\u5e38\u898b\u7684\u522a\u9664\u6578\u64da\u7684\u65b9\u6cd5\u662f\u4f7f\u7528DELETE\u8a9e\u53e5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u57fa\u672c\u7684DELETE\u8a9e\u53e5\u793a\u4f8b\uff1a<\/p>\n<pre><code>DELETE FROM \u8868\u540d WHERE \u689d\u4ef6;<\/code><\/pre>\n<p>\u4f8b\u5982\uff0c\u5982\u679c\u60a8\u60f3\u522a\u9664\u67d0\u500b\u7279\u5b9a\u689d\u4ef6\u4e0b\u7684\u6578\u64da\uff0c\u53ef\u4ee5\u9019\u6a23\u5beb\uff1a<\/p>\n<pre><code>DELETE FROM customers WHERE last_purchase_date &lt; '2020-01-01';<\/code><\/pre>\n<p>\u7136\u800c\uff0c\u5c0d\u65bc\u6578\u64da\u91cf\u7279\u5225\u5927\u7684\u8868\uff0c\u76f4\u63a5\u4f7f\u7528DELETE\u8a9e\u53e5\u53ef\u80fd\u6703\u5c0e\u81f4\u6027\u80fd\u554f\u984c\uff0c\u56e0\u70baDB2\u9700\u8981\u9010\u884c\u522a\u9664\u6578\u64da\u4e26\u8a18\u9304\u65e5\u8a8c\u3002<\/p>\n<h2 id=\"3-%e4%bd%bf%e7%94%a8partitioning%e6%8a%80%e8%a1%93-dLnQAtdAzU\">3. \u4f7f\u7528PARTITIONING\u6280\u8853<\/h2>\n<p>\u5982\u679c\u60a8\u7684\u8868\u4f7f\u7528\u4e86\u5206\u5340\u6280\u8853\uff0c\u60a8\u53ef\u4ee5\u8003\u616e\u522a\u9664\u6574\u500b\u5206\u5340\u3002\u9019\u6a23\u53ef\u4ee5\u5927\u5e45\u63d0\u9ad8\u522a\u9664\u64cd\u4f5c\u7684\u6548\u7387\u3002\u4ee5\u4e0b\u662f\u522a\u9664\u5206\u5340\u7684\u57fa\u672c\u8a9e\u6cd5\uff1a<\/p>\n<pre><code>ALTER TABLE \u8868\u540d DROP PARTITION partition_name;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u64cd\u4f5c\u4e0d\u50c5\u901f\u5ea6\u5feb\uff0c\u800c\u4e14\u4e0d\u6703\u5f71\u97ff\u5230\u5176\u4ed6\u6578\u64da\u3002<\/p>\n<h2 id=\"4-%e4%bd%bf%e7%94%a8truncate%e8%aa%9e%e5%8f%a5-dLnQAtdAzU\">4. \u4f7f\u7528TRUNCATE\u8a9e\u53e5<\/h2>\n<p>\u5982\u679c\u60a8\u9700\u8981\u522a\u9664\u6574\u500b\u8868\u4e2d\u7684\u6240\u6709\u6578\u64da\uff0c\u53ef\u4ee5\u8003\u616e\u4f7f\u7528TRUNCATE\u8a9e\u53e5\u3002\u9019\u500b\u8a9e\u53e5\u6703\u5feb\u901f\u522a\u9664\u8868\u4e2d\u7684\u6240\u6709\u884c\uff0c\u800c\u4e0d\u6703\u9010\u884c\u522a\u9664\uff0c\u5f9e\u800c\u63d0\u9ad8\u6027\u80fd\uff1a<\/p>\n<pre><code>TRUNCATE TABLE \u8868\u540d;<\/code><\/pre>\n<p>\u9700\u8981\u6ce8\u610f\u7684\u662f\uff0cTRUNCATE\u64cd\u4f5c\u662f\u4e0d\u53ef\u9006\u7684\uff0c\u56e0\u6b64\u5728\u57f7\u884c\u4e4b\u524d\u5fc5\u9808\u78ba\u4fdd\u4e0d\u518d\u9700\u8981\u8a72\u8868\u4e2d\u7684\u6578\u64da\u3002<\/p>\n<h2 id=\"5-%e4%bd%bf%e7%94%a8%e6%89%b9%e9%87%8f%e5%88%aa%e9%99%a4-dLnQAtdAzU\">5. \u4f7f\u7528\u6279\u91cf\u522a\u9664<\/h2>\n<p>\u5c0d\u65bc\u975e\u5e38\u5927\u7684\u8868\uff0c\u5efa\u8b70\u4f7f\u7528\u6279\u91cf\u522a\u9664\u7684\u65b9\u6cd5\u3002\u9019\u53ef\u4ee5\u901a\u904e\u5c07\u522a\u9664\u64cd\u4f5c\u5206\u6210\u591a\u500b\u5c0f\u6279\u6b21\u4f86\u5be6\u73fe\uff0c\u9019\u6a23\u53ef\u4ee5\u6e1b\u5c11\u5c0d\u7cfb\u7d71\u6027\u80fd\u7684\u5f71\u97ff\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>DECLARE CONTINUE HANDLER FOR NOT FOUND SET done = TRUE;\nSET done = FALSE;\nWHILE NOT done DO\n    DELETE FROM \u8868\u540d WHERE \u689d\u4ef6 LIMIT 1000;\n    COMMIT;\nEND WHILE;<\/code><\/pre>\n<p>\u9019\u6a23\u7684\u65b9\u5f0f\u53ef\u4ee5\u6709\u6548\u5730\u63a7\u5236\u6bcf\u6b21\u522a\u9664\u7684\u6578\u91cf\uff0c\u5f9e\u800c\u6e1b\u5c11\u5c0d\u7cfb\u7d71\u7684\u8ca0\u64d4\u3002<\/p>\n<h2 id=\"%e7%b8%bd%e7%b5%90-dLnQAtdAzU\">\u7e3d\u7d50<\/h2>\n<p>\u5728DB2\u4e2d\u522a\u9664\u6578\u64da\u91cf\u5927\u7684\u8868\u9700\u8981\u8b39\u614e\u8003\u616e\uff0c\u9078\u64c7\u5408\u9069\u7684\u65b9\u6cd5\u53ef\u4ee5\u63d0\u9ad8\u6548\u7387\u4e26\u6e1b\u5c11\u5c0d\u7cfb\u7d71\u6027\u80fd\u7684\u5f71\u97ff\u3002\u7121\u8ad6\u662f\u4f7f\u7528DELETE\u8a9e\u53e5\u3001PARTITIONING\u6280\u8853\u3001TRUNCATE\u8a9e\u53e5\u9084\u662f\u6279\u91cf\u522a\u9664\uff0c\u4e86\u89e3\u6bcf\u7a2e\u65b9\u6cd5\u7684\u512a\u7f3a\u9ede\u90fd\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u82e5\u60a8\u9700\u8981\u9032\u4e00\u6b65\u7684\u652f\u6301\u6216\u5c0b\u627e\u5408\u9069\u7684\u89e3\u6c7a\u65b9\u6848\uff0c\u8acb\u8003\u616e\u6211\u5011\u7684<a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a>\u670d\u52d9\uff0c\u70ba\u60a8\u7684\u6578\u64da\u7ba1\u7406\u63d0\u4f9b\u7a69\u5b9a\u7684\u57fa\u790e\u8a2d\u65bd\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5b78\u7fd2\u5982\u4f55\u5728DB2\u4e2d\u6709\u6548\u522a\u9664\u5927\u91cf\u6578\u64da\u7684\u8868\uff0c\u78ba\u4fdd\u6578\u64da\u5eab\u6027\u80fd\u548c\u7ba1\u7406\u7684\u6700\u4f73\u5be6\u8e10\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-162963","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162963","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=162963"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162963\/revisions"}],"predecessor-version":[{"id":162964,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/162963\/revisions\/162964"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=162963"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=162963"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=162963"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}