{"id":318377,"date":"2024-01-18T09:35:13","date_gmt":"2024-01-18T01:35:13","guid":{"rendered":"https:\/\/www.idc.net\/help\/318377\/"},"modified":"2024-01-18T09:35:13","modified_gmt":"2024-01-18T01:35:13","slug":"%e5%af%b9db2%e6%80%a7%e8%83%bd%e8%b0%83%e4%bc%98%e4%b8%ad%e7%9a%84%e8%ae%be%e8%ae%a1%e5%b9%b6%e9%85%8d%e7%bd%ae%e6%95%b0%e6%8d%ae%e5%ba%93%e7%9a%84%e6%8f%8f%e8%bf%b0","status":"publish","type":"post","link":"https:\/\/idc.net\/help\/318377\/","title":{"rendered":"\u5bf9DB2\u6027\u80fd\u8c03\u4f18\u4e2d\u7684\u8bbe\u8ba1\u5e76\u914d\u7f6e\u6570\u636e\u5e93\u7684\u63cf\u8ff0"},"content":{"rendered":"

\u6b64\u6587\u7ae0\u4e3b\u8981\u8bb2\u8ff0\u7684\u662fDB2\u6027\u80fd\u8c03\u4f18\u4e4b\u8bbe\u8ba1\u5e76\u914d\u7f6e\u6570\u636e\u5e93\uff0c\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\u5f88\u591a\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u914d\u7f6e\u9009\u9879\u53ef\u4ee5\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\u3002\u5bf9\u6570\u636e\u5e93\u8bbe\u8ba1\u7684\u66f4\u591a\u5efa\u8bae\u53c2\u8003\u201c Planning your Physical Database Design \u201d***\u5b9e\u8df5\u6587\u7ae0\u3002<\/p>\n

 <\/p>\n

\u4f7f\u7528\u7ea6\u675f\u6765\u63d0\u9ad8\u67e5\u8be2\u4f18\u5316<\/p>\n

\u8003\u8651\u5b9a\u4e49\u7684\u552f\u4e00\u6027\uff0c\u68c0\u67e5\u5e76\u53c2\u8003\u4e00\u81f4\u6027\u7ea6\u675f\u3002\u8fd9\u4e9b\u7ea6\u675f\u63d0\u4f9b\u4e86\u8bed\u4e49\u4fe1\u606f\uff0c\u5141\u8bb8 DB2 \u4f18\u5316\u5668\u91cd\u5199\u67e5\u8be2\u6765\u8bc4\u4f30\u8fde\u63a5\uff0c\u901a\u8fc7\u8fde\u63a5\u6765\u964d\u4f4e\u805a\u5408\u548c FETCH FIRST N ROWS\uff0c\u53bb\u6389\u4e0d\u5fc5\u8981\u7684 DISTINCT \u9009\u9879\u88ab\u548c\u4e00\u4e9b\u5176\u5b83\u7684\u4f18\u5316\u3002\u5f53\u5e94\u7528\u7a0b\u5e8f\u53ef\u4ee5\u4fdd\u8bc1\u5b83\u81ea\u5df1\u7684\u5173\u7cfb\u65f6\uff0c\u4fe1\u606f\u7ea6\u675f\u4e5f\u53ef\u4ee5\u88ab\u7528\u6765\u68c0\u67e5\u5e76\u53c2\u8003\u4e00\u81f4\u6027\u7ea6\u675f\u3002\u76f8\u540c\u7684\u4f18\u5316\u4e5f\u662f\u53ef\u4ee5\u7684\u3002<\/p>\n

\u5f53\u66f4\u65b0(\u63d2\u5165\u6216\u5220\u9664)\u884c\u7684\u65f6\u5019\uff0c\u6765\u81ea\u6570\u636e\u5e93\u7ba1\u7406\u5668\u7684\u5f3a\u5236\u7ea6\u675f\u53ef\u80fd\u5bfc\u81f4\u5f88\u9ad8\u7684\u7cfb\u7edf\u5f00\u9500\uff0c\u5c24\u5176\u5728\u66f4\u65b0\u5f88\u591a\u6709\u4e00\u81f4\u6027\u7ea6\u675f\u7684\u884c\u7684\u65f6\u5019\u3002\u5982\u679c\u4e00\u4e2a\u5e94\u7528\u7a0b\u5e8f\u5728\u66f4\u65b0\u4e00\u884c\u4e4b\u524d\u5df2\u7ecf\u9a8c\u8bc1\u7684\u4fe1\u606f\uff0c\u8fd9\u6837\u4f7f\u7528\u4fe1\u606f\u7ea6\u675f\u6bd4\u8d77\u6b63\u5e38\u7684\u7ea6\u675f\u66f4\u6709\u6548<\/p>\n

\u4f8b\u5982\uff0c\u8003\u8651 2 \u4e2a\u8868 DAILY_SALES \u548c CUSTOMER \u3002\u5728 CUSTOMER \u8868\u4e2d\u7684\u6bcf\u4e00\u884c\u90fd\u6709\u4e00\u4e2a\u552f\u4e00\u7684\u5ba2\u6237\u952e\u503c(CUST_KEY)\u3002 DAILY_SALES \u5305\u542b\u4e00\u4e2a CUST_KEY \u5217\u5e76\u4e14\u6bcf\u4e00\u884c\u90fd\u5f15\u7528\u4e00\u4e2a CUSTOMER \u8868\u4e2d\u7684\u5ba2\u6237\u952e\u3002\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u53c2\u8003\u4e00\u81f4\u6027\u7ea6\u675f\u6765\u9632\u6b62\u5728 CUSTOMER \u548c DAILY_SALES \u4e4b\u95f4\u53d1\u751f 1:N \u7684\u5173\u7cfb\u3002<\/p>\n

\u5982\u679c\u5e94\u7528\u7a0b\u5e8f\u8981\u5f3a\u5236\u7ea6\u675f\u8fd9\u4e2a\u5173\u7cfb\uff0c\u53ef\u4ee5\u521b\u5efa\u4e00\u4e2a\u4fe1\u606f\u5316\u7684\u7ea6\u675f\u3002\u90a3\u4e48\u4e0b\u9762\u7684\u67e5\u8be2\u907f\u514d\u4e86\u5728 CUSTOMER \u548c DAILY_SALES \u4e4b\u95f4\u8fdb\u884c\u8fde\u63a5\uff0c\u56e0\u4e3a\u6ca1\u6709\u4ece CUSTOMER \u83b7\u53d6\u4efb\u4f55\u5217\uff0c\u800c\u4e14\u6765\u81ea\u4e8e DAILY_SALES \u7684\u6bcf\u4e00\u884c\u90fd\u53ef\u4ee5\u5728 CUSTOMER \u91cc\u9762\u627e\u5230\u4e0e\u4e4b\u5339\u914d\u7684\u884c\uff0c\u6240\u4ee5\u67e5\u8be2\u4f18\u5316\u5668\u5c06\u81ea\u52a8\u5220\u9664\u8fde\u63a5<\/p>\n

\n \n \n 
    \n  \n  \n  
  1. SELECT AMT_SOLD, SALE PRICE, PROD_DESC   <\/span><\/span><\/li>\n  \n  \n  
  2. FROM DAILY_SALES, PRODUCT, CUSTOMER   <\/span><\/li>\n  \n  \n  
  3. WHERE   <\/span><\/li>\n  \n  \n  
  4. DAILY_SALES.PROD_KEY<\/span> = <\/span>PRODUCT<\/span>.PRODKEY AND   <\/span><\/li>\n  \n  \n  
  5. DAILY_SALES.CUST_KEY<\/span> = <\/span>CUSTOMER<\/span>.CUST_KEY  <\/span><\/li>\n \n \n <\/ol><\/pre>\n
    \u5e94\u7528\u7a0b\u5e8f\u5fc5\u987b\u6267\u884c\u4fe1\u606f\u7ea6\u675f\uff0c\u5426\u5219\u67e5\u8be2\u53ef\u80fd\u8fd4\u56de\u4e0d\u6b63\u786e\u7684\u7ed3\u679c\u3002\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u5982\u679c\u884c\u5b58\u5728\u4e8e DAILY_SALES \u4e2d\uff0c\u5728 CUSTOMER \u8868\u4e2d\u5374\u627e\u4e0d\u5230\u76f8\u5e94\u7684\u5ba2\u6237\u952e\uff0c\u90a3\u4e48\u4e0a\u9762\u7684\u67e5\u8be2\u8fd4\u56de\u7684\u884c\u53ef\u80fd\u4e0d\u6b63\u786e\u3002<\/p>\n
     <\/p>\n
    \u5728\u590d\u6742\u67e5\u8be2\u4e2d\u4f7f\u7528 REOPT \u7ed1\u5b9a\u9009\u9879\u548c\u8f93\u5165\u53d8\u91cf<\/p>\n
    \u5728\u4e00\u4e2a\u5728\u7ebf\u4e8b\u52a1\u5904\u7406(OLTP)\u73af\u5883\u7684\u4e2d\u8f93\u5165\u53d8\u91cf\u6709\u8f83\u597d\u7684\u8bed\u53e5\u51c6\u5907\u65f6\u95f4\u662f\u5173\u952e\uff0c\u5728\u8fd9\u6837\u7684\u73af\u5883\u4e2d\u8bed\u53e5\u5f80\u5f80\u6bd4\u8f83\u7b80\u5355\u800c\u4e14\u67e5\u8be2\u8ba1\u5212\u9009\u62e9\u4e5f\u5f88\u7b80\u5355\u3002\u4f7f\u7528\u4e0d\u540c\u7684\u8f93\u5165\u53d8\u91cf\u591a\u6b21\u8fd0\u884c\u76f8\u540c\u7684\u8bed\u53e5\u53ef\u4ee5\u590d\u7528\u5728\u52a8\u6001\u8bed\u53e5\u9ad8\u901f\u7f13\u5b58\u4e2d\u7f16\u8bd1\u4e86\u7684\u8bbf\u95ee\u7247\u6bb5\uff0c\u907f\u514d\u4e86\u7531\u4e8e\u968f\u65f6\u66f4\u6539\u8f93\u5165\u503c\u800c\u9020\u6210\u6602\u8d35\u7684 SQL \u8bed\u53e5\u7f16\u8bd1\u5f00\u9500\u3002<\/p>\n
    \u7136\u800c\uff0c\u8f93\u5165\u53d8\u91cf\u5bf9\u590d\u6742\u7684\u67e5\u8be2\u8d1f\u8f7d\u4e5f\u4f1a\u9020\u6210\u95ee\u9898\uff0c\u5b83\u4eec\u7684\u67e5\u8be2\u8ba1\u5212\u9009\u62e9\u975e\u5e38\u590d\u6742\uff0c\u56e0\u6b64\u4f18\u5316\u5668\u9700\u8981\u66f4\u591a\u7684\u4fe1\u606f\u6765\u505a\u51fa\u597d\u7684\u51b3\u5b9a\u3002\u800c\u4e14\uff0c\u8bed\u53e5\u7f16\u8bd1\u65f6\u95f4\u901a\u5e38\u662f\u603b\u8fd0\u884c\u65f6\u95f4\u4e2d\u7684\u4e00\u4e2a\u5f88\u5c0f\u7ec4\u6210\u90e8\u5206\u3002\u56e0\u4e3a BI \u67e5\u8be2\u901a\u5e38\u4e0d\u4f1a\u91cd\u590d\uff0c\u6240\u4ee5\u5e76\u6ca1\u6709\u4ece\u52a8\u6001\u8bed\u53e5\u9ad8\u901f\u7f13\u5b58\u4e0a\u5f97\u5230\u597d\u5904\u3002<\/p>\n
    \u5982\u679c\u5728\u4e00\u4e2a\u590d\u6742\u67e5\u8be2\u5de5\u4f5c\u8d1f\u8f7d\u4e2d\u9700\u8981\u4f7f\u7528\u8f93\u5165\u53d8\u91cf\uff0c\u8bf7\u8003\u8651\u4f7f\u7528 REOPT(ALWAYS) BIND \u9009\u9879\u3002\u5f53\u8f93\u5165DB2\u6027\u80fd\u8c03\u4f18\u53d8\u91cf\u503c\u662f\u5df2\u77e5\u7684\uff0cREOPT BIND \u9009\u9879\u4ece PREPARE \u5230 OPEN \u6216\u6267\u884c\u8fc7\u7a0b\u4e2d\u63a8\u8fdf\u4e86\u8bed\u53e5\u7f16\u8bd1\u3002\u53d8\u91cf\u503c\u88ab\u4f20\u9012\u5230 SQL \u7f16\u8bd1\u5668\u4e2d\uff0c\u8fd9\u6837\u4f18\u5316\u5668\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u4fbf\u5229\u6765\u8ba1\u7b97\u4e00\u4e2a\u66f4\u7cbe\u786e\u7684\u9009\u62e9\u8bc4\u4f30\u3002 REOPT(ALWAYS) \u8868\u793a\u6240\u6709\u6267\u884c\u8bed\u53e5\u90fd\u5e94\u8be5\u88ab\u9884\u7f16\u8bd1\u3002<\/p>\n
    REOPT(ALWAYS) \u4e5f\u53ef\u4ee5\u88ab\u7528\u4e8e\u6d89\u53ca\u7279\u6b8a\u5bc4\u5b58\u5668\u7684\u590d\u6742\u67e5\u8be2\uff0c\u6bd4\u5982 \"WHERE TRANS_DATE = CURRENT DATE - 30 DAYS\" \u3002\u5982\u679c\u8f93\u5165\u53d8\u91cf\u5bf9 OLTP \u5de5\u4f5c\u8d1f\u8f7d\u9020\u6210\u8f83\u5dee\u7684\u8bbf\u95ee\u8ba1\u5212\u9009\u62e9\uff0c\u5e76\u4e14 REOPT(ALWAYS) \u9009\u9879\u56e0\u4e3a\u8bed\u53e5\u7f16\u8bd1\u9020\u6210\u8fc7\u591a\u7684\u5f00\u9500\uff0c\u90a3\u4e48\u8003\u8651\u5bf9\u6311\u9009\u8fc7\u7684\u67e5\u8be2\u4f7f\u7528 REOPT(ONCE) \u3002<\/p>\n
    REOPT(ONCE) \u63a8\u8fdf\u8bed\u53e5\u7684\u7f16\u8bd1\u76f4\u5230***\u6570\u636e\u53d8\u91cf\u88ab\u7ed1\u5b9a\u3002\u4f7f\u7528\u8fd9\u4e2a***\u8f93\u5165\u53d8\u91cf\u503c\u7f16\u8bd1\u5e76\u4f18\u5316 SQL \u8bed\u53e5\u3002\u540e\u7eed\u4f7f\u7528\u4e0d\u540c\u7684\u503c\u6765\u8fd0\u884c\u7684\u8bed\u53e5\u5c06\u91cd\u7528\u57fa\u4e8e***\u4e2a\u8f93\u5165\u7f16\u8bd1\u7684\u67e5\u8be2\u7247\u6bb5\u3002\u8fd9\u662f\u4e00\u4e2a\u597d\u65b9\u6cd5 , \u5982\u679c***\u8f93\u5165\u53d8\u91cf\u4ee3\u8868\u4e86\u540e\u7eed\u7684\u8f93\u5165\u503c\uff0c\u5e76\u4e14\u5728\u8f93\u5165\u503c\u672a\u77e5\u7684\u60c5\u51b5\u4e0b\u6bd4\u8d77\u4f18\u5316\u5668\u4f7f\u7528\u4e0d\u540c\u7684\u503c\u8fdb\u884c\u8bc4\u4f30\uff0c\u5b83\u63d0\u4f9b\u4e2a\u4e86\u4e00\u4e2a\u66f4\u597d\u7684\u67e5\u8be2\u8bbf\u95ee\u8ba1\u5212 .<\/p>\n
    \u4e0a\u8ff0\u7684\u76f8\u5173\u5185\u5bb9\u5c31\u662f\u5bf9DB2\u6027\u80fd\u8c03\u4f18\uff1a\u8bbe\u8ba1\u5e76\u914d\u7f6e\u4f60\u7684\u6570\u636e\u5e93\u7684\u90e8\u5206\u5185\u5bb9\u7684\u63cf\u8ff0\uff0c\u5e0c\u671b\u4f1a\u7ed9\u4f60\u5e26\u6765\u4e00\u4e9b\u5e2e\u52a9\u5728\u6b64\u65b9\u9762\u3002<\/p>\n
    \u3010\u7f16\u8f91\u63a8\u8350\u3011<\/p>\n
      \n
    1. DB2\u5efa\u7acb\u6570\u636e\u5e93\u5206\u533a\u8981\u7528\u7684\u547d\u4ee4\u6709\u54ea\u4e9b\uff1f<\/li>\n
    2. DB2 9.5\u7684\u6570\u636e\u5e93\u5185\u5b58\u4fdd\u62a4\uff0c\u8f7b\u677e\u638c\u63e1\uff01<\/li>\n
    3. DB2\u5f3a\u5236\u4f18\u5316\u5668\u7684\u4f7f\u7528\u201c\u7a8d\u95e8\u201d\u4e0d\u5f97\u4e0d\u770b<\/li>\n
    4. DB2\u5feb\u7167\u51fd\u6570\u5982\u4f55\u6b63\u786e\u7406\u89e3\uff1f<\/li>\n
    5. \u4f7f\u7528DB2\u4e34\u65f6\u8868\u65f6\u54ea\u4e9b\u4e8b\u9879\u662f\u503c\u5f97\u5173\u6ce8\uff1f<\/li>\n<\/ol>\n
       <\/p>\n","protected":false},"excerpt":{"rendered":"
      \u6b64\u6587\u7ae0\u4e3b\u8981\u8bb2\u8ff0\u7684\u662fDB2\u6027\u80fd\u8c03\u4f18\u4e4b\u8bbe\u8ba1\u5e76\u914d\u7f6e\u6570\u636e\u5e93\uff0c\u5728\u5b9e\u9645\u64cd\u4f5c\u4e2d\u5f88\u591a\u6570\u636e\u5e93\u8bbe\u8ba1\u4e0e\u914d\u7f6e\u9009\u9879\u53ef\u4ee5\u5f71\u54cd\u67e5\u8be2\u6027\u80fd\u3002\u5bf9\u6570 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[7038],"tags":[],"class_list":["post-318377","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/318377","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/comments?post=318377"}],"version-history":[{"count":0,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/posts\/318377\/revisions"}],"wp:attachment":[{"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/media?parent=318377"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/categories?post=318377"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/idc.net\/help\/wp-json\/wp\/v2\/tags?post=318377"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}