{"id":1523,"date":"2018-05-06T16:12:18","date_gmt":"2018-05-06T08:12:18","guid":{"rendered":"http:\/\/www.821121.com\/?p=1523"},"modified":"2021-05-06T16:25:16","modified_gmt":"2021-05-06T08:25:16","slug":"%e7%bb%9f%e8%ae%a1%e4%bf%a1%e6%81%af%e4%b9%8b%e9%98%88%e5%80%bc%e4%bf%ae%e6%94%b9","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1523","title":{"rendered":"\u7edf\u8ba1\u4fe1\u606f\u4e4b\u9608\u503c\u4fee\u6539"},"content":{"rendered":"

\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u7b56\u7565<\/h2>\n

\u6bcf\u6b21\u81ea\u52a8\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\uff0c\u5e76\u4e0d\u662f\u5bf9\u6240\u6709\u8868\u90fd\u8fdb\u884c\u6536\u96c6\uff0cOracle\u53ea\u5bf9\u90a3\u4e9b\u5df2\u7ecf\u7edf\u8ba1\u4fe1\u606f\u5931\u6548\u7684\u5bf9\u8c61\u8fdb\u884c\u6536\u96c6\uff0c\u90a3\u4e48Oracle\u5982\u4f55\u5224\u65ad\u54ea\u4e9b\u5bf9\u8c61\u7684\u7edf\u8ba1\u4fe1\u606f\u5931\u6548\u4e86\u5462\uff1f
\n\u5728Oracle 11g\u4e2d\uff0c\u5982\u679c\u53c2\u6570STATISTICS_LEVEL\u7684\u503c\u4e3aTYPICAL(\u9ed8\u8ba4)\u6216\u8005ALL\uff0c\u5219DBA_TAB_MODIFICATIONS\u4f1a\u8bb0\u5f55\u81ea\u4e0a\u6b21\u81ea\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u5b8c\u6210\u4e4b\u540e\u5bf9\u76ee\u6807\u8868\u7684insert\u3001update\u3001delete\u7684\u64cd\u4f5c\u5f71\u54cd\u884c\u6570\uff0c\u5e76\u4e14\u8fd8\u4f1a\u8bb0\u5f55\u81ea\u4ece\u4e0a\u6b21\u81ea\u52a8\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u4e4b\u540e\u662f\u5426\u53d1\u751f\u8fc7truncate\u3002\u9700\u8981\u6ce8\u610f\u7684\u662fDBA_TAB_MODIFICATIONS\u5e76\u4e0d\u4f1a\u5b9e\u65f6\u66f4\u65b0\uff0c\u5982\u679c\u9700\u8981\u67e5\u770b\u6700\u65b0\u4fe1\u606f\uff0c\u53ef\u4ee5\u624b\u52a8\u66f4\u65b0\u8be5\u8868\u7684\u4fe1\u606f\uff1a<\/p>\n

EXEC dbms_stats.flush_database_monitoring_info();<\/code><\/pre>\n
Oracle\u6536\u96c6\u5931\u6548\u7684\u7edf\u8ba1\u4fe1\u606f\u7684\u7b56\u7565\uff1a\u81ea\u4e0a\u6b21\u81ea\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u4f5c\u4e1a\u5b8c\u6210\u4e4b\u540e\uff0c\u5982\u679cDBA_TAB_MODIFICATIONS\u4e2d\u8bb0\u5f55\u7684INSERT+UPDATE+DELETE\u6240\u5f71\u54cd\u7684\u884c\u8bb0\u5f55\u4e4b\u548c\u8d85\u8fc7\u4e86DBA_TABLES\u4e2d\u76ee\u6807\u8868\u8bb0\u5f55\u6570\u768410%\uff0c\u6216\u8005\u662f\u81ea\u4e0a\u6b21\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u5b8c\u6210\u4e4b\u540e\u76ee\u6807\u8868\u6267\u884c\u8fc7truncate\u64cd\u4f5c\uff0c\u90a3\u4e48Oracle\u4f1a\u8ba4\u4e3a\u76ee\u6807\u8868\u7684\u7edf\u8ba1\u4fe1\u606f\u5df2\u7ecf\u5931\u6548\uff0c\u81ea\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u4f5c\u4e1a\u5c31\u4f1a\u5bf9\u76ee\u6807\u8868\u91cd\u65b0\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u3002<\/p>\n
\u7edf\u8ba1\u4fe1\u606f\u9608\u503c\u4fee\u6539<\/h2>\n
\u5728Oracle 11g\u4e2d\uff0c\u9ed8\u8ba4\u7edf\u8ba1\u4fe1\u606f\u7684\u6536\u96c6\u9608\u503c\u4e3a10%\uff0c\u537310%\u7684\u884c\u6570\u636e\u53d1\u751f\u53d8\u5316\u6216\u8005\u6267\u884c\u4e86truncate\uff0c\u624d\u4f1a\u518d\u6b21\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u3002\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u7684\u65b9\u6cd5\u9488\u5bf9\u5355\u4e2a\u8868\u4fee\u6539\u9608\u503c\u3002<\/p>\n
\u4f8b\u5b501\uff1a\u4fee\u6539test.test\u8868\u7684\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u9608\u503c\u4e3a5%\u3002<\/p>\n
\u67e5\u770b\u521d\u59cb\u7684\u9608\u503c\uff1a<\/p>\n
SQL> SELECT dbms_stats.get_prefs(pname => 'STALE_PERCENT',ownname => 'TEST',tabname => 'TEST') FROM dual;<\/code><\/pre>\n
\"file\"<\/p>\n
\u4fee\u6539\u9608\u503c\u4e3a5\uff1a<\/p>\n
SQL> EXEC dbms_stats.set_table_prefs(ownname => 'TEST',tabname => 'TEST',pname   => 'STALE_PERCENT',pvalue  => 5);<\/code><\/pre>\n
\"file\"
\n\u786e\u8ba4\u4fee\u6539\u540e\u7684\u9608\u503c\uff1a<\/p>\n
SQL> SELECT dbms_stats.get_prefs(pname => 'STALE_PERCENT',ownname => 'TEST',tabname => 'TEST') FROM dual;<\/code><\/pre>\n
\"file\"
\n\u9700\u8981\u6ce8\u610f\u7684\u662f\uff1a\u5f53\u9608\u503c\u4e3a0\u65f6\uff0c\u4e0d\u7ba1\u6570\u636e\u5982\u4f55\u53d8\u5316\uff0c\u6bcf\u5929\u90fd\u4f1a\u81ea\u52a8\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u7b56\u7565 \u6bcf\u6b21\u81ea\u52a8\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\uff0c\u5e76\u4e0d\u662f\u5bf9\u6240<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[18],"tags":[],"class_list":["post-1523","post","type-post","status-publish","format-standard","hentry","category-oracle-11g"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1523","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1523"}],"version-history":[{"count":4,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1523\/revisions"}],"predecessor-version":[{"id":1530,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1523\/revisions\/1530"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1523"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1523"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1523"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}