{"id":171247,"date":"2024-11-07T01:09:17","date_gmt":"2024-11-06T17:09:17","guid":{"rendered":"https:\/\/server.hk\/cnblog\/171247\/"},"modified":"2024-11-07T01:09:18","modified_gmt":"2024-11-06T17:09:18","slug":"%e9%81%b7%e7%a7%bb%e9%a0%86%e5%88%a9%ef%bc%8c%e6%95%b8%e6%93%9a%e7%84%a1%e6%90%8d%e5%a4%b1-hive%e8%b7%af%e5%be%91%e8%ae%8a%e6%9b%b4-%e5%8e%9f%e6%9c%89%e6%95%b8%e6%93%9a%e5%ba%ab","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/171247\/","title":{"rendered":"\u9077\u79fb\u9806\u5229\uff0c\u6578\u64da\u7121\u640d\u5931 (hive\u8def\u5f91\u8b8a\u66f4 \u539f\u6709\u6578\u64da\u5eab)"},"content":{"rendered":"<h1 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id=\"hive%e7%b0%a1%e4%bb%8b-YbuBlBXvew\">Hive\u7c21\u4ecb<\/h2>\n<p>Apache Hive\u662f\u4e00\u500b\u6578\u64da\u5009\u5eab\u57fa\u65bcHadoop\u7684\u5de5\u5177\uff0c\u4e3b\u8981\u7528\u65bc\u6578\u64da\u7684\u67e5\u8a62\u548c\u5206\u6790\u3002\u5b83\u63d0\u4f9b\u4e86\u4e00\u7a2e\u985e\u4f3cSQL\u7684\u67e5\u8a62\u8a9e\u8a00\uff08HiveQL\uff09\uff0c\u4f7f\u5f97\u7528\u6236\u80fd\u5920\u8f15\u9b06\u5730\u9032\u884c\u6578\u64da\u64cd\u4f5c\u3002\u96a8\u8457\u6578\u64da\u91cf\u7684\u589e\u9577\uff0cHive\u7684\u4f7f\u7528\u8d8a\u4f86\u8d8a\u666e\u904d\uff0c\u5c24\u5176\u662f\u5728\u5927\u6578\u64da\u74b0\u5883\u4e2d\u3002<\/p>\n<h2 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id=\"%e7%a2%ba%e4%bf%9d%e6%95%b8%e6%93%9a%e7%84%a1%e6%90%8d%e5%a4%b1%e7%9a%84%e7%ad%96%e7%95%a5-YbuBlBXvew\">\u78ba\u4fdd\u6578\u64da\u7121\u640d\u5931\u7684\u7b56\u7565<\/h2>\n<p>\u70ba\u4e86\u78ba\u4fdd\u5728Hive\u8def\u5f91\u8b8a\u66f4\u904e\u7a0b\u4e2d\u6578\u64da\u7121\u640d\u5931\uff0c\u53ef\u4ee5\u63a1\u53d6\u4ee5\u4e0b\u7b56\u7565\uff1a<\/p>\n<h3 id=\"1-%e5%82%99%e4%bb%bd%e6%95%b8%e6%93%9a-YbuBlBXvew\">1. \u5099\u4efd\u6578\u64da<\/h3>\n<p>\u5728\u9032\u884c\u4efb\u4f55\u9077\u79fb\u4e4b\u524d\uff0c\u9996\u5148\u61c9\u8a72\u5c0d\u539f\u6709\u6578\u64da\u9032\u884c\u5b8c\u6574\u5099\u4efd\u3002\u9019\u53ef\u4ee5\u901a\u904e\u4ee5\u4e0b\u547d\u4ee4\u5be6\u73fe\uff1a<\/p>\n<pre><code>CREATE TABLE backup_table AS SELECT * FROM original_table;<\/code><\/pre>\n<h3 id=\"2-%e4%bd%bf%e7%94%a8hive%e7%9a%84alter-table%e5%91%bd%e4%bb%a4-YbuBlBXvew\">2. \u4f7f\u7528Hive\u7684ALTER TABLE\u547d\u4ee4<\/h3>\n<p>\u5728Hive\u4e2d\uff0c\u53ef\u4ee5\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u4f86\u8b8a\u66f4\u6578\u64da\u8def\u5f91\u3002\u4ee5\u4e0b\u662f\u793a\u4f8b\u547d\u4ee4\uff1a<\/p>\n<pre><code>ALTER TABLE table_name SET LOCATION 'new_path';<\/code><\/pre>\n<p>\u9019\u6a23\u53ef\u4ee5\u76f4\u63a5\u5c07\u6578\u64da\u8def\u5f91\u66f4\u6539\u70ba\u65b0\u7684\u4f4d\u7f6e\uff0c\u800c\u4e0d\u6703\u5f71\u97ff\u539f\u6709\u6578\u64da\u3002<\/p>\n<h3 id=\"3-%e9%a9%97%e8%ad%89%e6%95%b8%e6%93%9a%e5%ae%8c%e6%95%b4%e6%80%a7-YbuBlBXvew\">3. \u9a57\u8b49\u6578\u64da\u5b8c\u6574\u6027<\/h3>\n<p>\u5728\u5b8c\u6210\u8def\u5f91\u8b8a\u66f4\u5f8c\uff0c\u61c9\u8a72\u9032\u884c\u6578\u64da\u5b8c\u6574\u6027\u6aa2\u67e5\u3002\u53ef\u4ee5\u901a\u904e\u6bd4\u8f03\u539f\u6709\u6578\u64da\u548c\u65b0\u8def\u5f91\u4e0b\u7684\u6578\u64da\u884c\u6578\u4f86\u78ba\u4fdd\u6578\u64da\u672a\u4e1f\u5931\uff1a<\/p>\n<pre><code>SELECT COUNT(*) FROM original_table;\nSELECT COUNT(*) FROM new_table;<\/code><\/pre>\n<h3 id=\"4-%e6%b8%ac%e8%a9%a6%e6%9f%a5%e8%a9%a2-YbuBlBXvew\">4. \u6e2c\u8a66\u67e5\u8a62<\/h3>\n<p>\u5728\u78ba\u8a8d\u6578\u64da\u5b8c\u6574\u6027\u5f8c\uff0c\u61c9\u8a72\u9032\u884c\u67e5\u8a62\u6e2c\u8a66\uff0c\u4ee5\u78ba\u4fdd\u65b0\u8def\u5f91\u4e0b\u7684\u6578\u64da\u53ef\u4ee5\u6b63\u5e38\u8a2a\u554f\u548c\u64cd\u4f5c\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-YbuBlBXvew\">\u7d50\u8ad6<\/h2>\n<p>\u5728Hive\u4e2d\u9032\u884c\u8def\u5f91\u8b8a\u66f4\u6642\uff0c\u78ba\u4fdd\u6578\u64da\u7121\u640d\u5931\u662f\u81f3\u95dc\u91cd\u8981\u7684\u3002\u901a\u904e\u5099\u4efd\u6578\u64da\u3001\u4f7f\u7528ALTER TABLE\u547d\u4ee4\u3001\u9a57\u8b49\u6578\u64da\u5b8c\u6574\u6027\u4ee5\u53ca\u6e2c\u8a66\u67e5\u8a62\uff0c\u53ef\u4ee5\u6709\u6548\u5730\u5be6\u73fe\u6578\u64da\u7684\u5b89\u5168\u9077\u79fb\u3002\u9019\u4e9b\u6b65\u9a5f\u4e0d\u50c5\u80fd\u5920\u5e6b\u52a9\u4f01\u696d\u907f\u514d\u6578\u64da\u4e1f\u5931\u7684\u98a8\u96aa\uff0c\u9084\u80fd\u63d0\u9ad8\u6574\u9ad4\u6578\u64da\u7ba1\u7406\u7684\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u6709\u95dc<em><a href=\"https:\/\/server.hk\">\u9999\u6e2fVPS<\/a><\/em>\u548c<em><a href=\"https:\/\/server.hk\">\u4e91\u670d\u52a1\u5668<\/a><\/em>\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u9077\u79fb\u9806\u5229\uff0c\u6578\u64da\u7121\u640d\u5931\uff01\u63a2\u7d22Hive\u8def\u5f91\u8b8a\u66f4\u7684\u6700\u4f73\u5be6\u8e10\uff0c\u78ba\u4fdd\u539f\u6709\u6578\u64da\u5eab\u7684\u5b8c\u6574\u6027\u8207\u5b89\u5168\u6027\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-171247","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171247","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=171247"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171247\/revisions"}],"predecessor-version":[{"id":171248,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/171247\/revisions\/171248"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=171247"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=171247"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=171247"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}