{"id":1959,"date":"2023-07-08T11:21:55","date_gmt":"2023-07-08T03:21:55","guid":{"rendered":"http:\/\/www.821121.com\/?p=1959"},"modified":"2023-12-08T11:46:01","modified_gmt":"2023-12-08T03:46:01","slug":"%e5%bf%ab%e9%80%9f%e5%9c%b0%e6%94%b6%e9%9b%86%e7%bb%9f%e8%ae%a1%e4%bf%a1%e6%81%af%e5%b0%8f%e6%8a%80%e5%b7%a7","status":"publish","type":"post","link":"http:\/\/www.821121.com\/?p=1959","title":{"rendered":"\u5feb\u901f\u5730\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u5c0f\u6280\u5de7"},"content":{"rendered":"

\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u91c7\u6837\u6bd4\u4f8b\uff0c\u589e\u52a0\u5e76\u884c\u5ea6\u5f97\u65b9\u5f0f\u6765\u52a0\u901f\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u3002
\n\u603b\u7ed3\u4e00\u4e9b\u5c0f\u6280\u5de7\uff1a<\/p>\n

1. \u65b9\u6cd51- AUTO_DEGREE<\/h3>\n

\u4e3a\u6307\u5b9a\u8868\u5b9a\u4e49\u4e00\u4e2a\u7279\u5b9a\u7684\u5e76\u884c\u5ea6<\/p>\n

exec dbms_stats.set_table_prefs(user, 'BIG_TABLE', 'DEGREE', 8)<\/code><\/pre>\n
\u8ba9Oracle\u4e3a\u4f60\u6765\u51b3\u5b9a\u5e76\u884c\u5ea6\uff1a<\/p>\n
exec dbms_stats.set_table_prefs(user, 'BIG_TABLE', 'DEGREE', DBMS_STATS.AUTO_DEGREE)<\/code><\/pre>\n
\u4e00\u4e2a\u6e05\u6670\u4e14\u7b80\u5355\u7684\u65b9\u6cd5\u662f\u5728\u5168\u5c40\u7ea7\u522b\u8bbe\u7f6e\u8be5\u5c5e\u6027\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('DEGREE', DBMS_STATS.AUTO_DEGREE)<\/code><\/pre>\n
2. \u65b9\u6cd52 - CONCURRENT<\/h3>\n
\u9996\u5148\uff0c\u5173\u95ed\u5e76\u884c\u6267\u884c\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('DEGREE', 1)<\/code><\/pre>\n
CONCURRENT\u504f\u597d\u53c2\u6570\u5141\u8bb8DBMS_SCHEDULER\u4e00\u6b21\u542f\u52a8\u591a\u4e2a\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u4efb\u52a1\uff0c\u56e0\u6b64\uff0c\u6570\u636e\u5e93\u4f1a\u5e76\u53d1\u7684\u5728\u591a\u4e2a\u8868\u548c\u8868\u5206\u533a\u4e0a\u6536\u96c6\u7edf\u8ba1\u4fe1\u606f\u3002\u6211\u4eec\u53ef\u4ee5\u4ec5\u4e3a\u81ea\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u542f\u7528\u8be5\u884c\u4e3a\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('CONCURRENT','AUTOMATIC')<\/code><\/pre>\n
\u5982\u679c\u4f60\u542f\u7528\u4e86\u6570\u636e\u5e93\u8d44\u6e90\u7ba1\u7406\u8ba1\u5212\uff0c\u4f60\u53ef\u4ee5\u4e3a\u624b\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u4f7f\u7528\u5e76\u53d1\uff0c\u6216\u8005\u624b\u52a8\u7edf\u8ba1\u4fe1\u606f\u548c\u81ea\u52a8\u7edf\u8ba1\u5747\u4f7f\u7528\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('CONCURRENT','MANUAL')\nexec dbms_stats.set_global_prefs('CONCURRENT','ALL')<\/code><\/pre>\n
3. \u65b9\u6cd53 - CONCURRENT and AUTO_DEGREE<\/h3>\n
\u540c\u65f6\u542f\u7528CONCURRENT and AUTO_DEGREE\uff0c\u5373\u591a\u4e2a\u4efb\u52a1\u5c06\u542f\u52a8\uff0c\u4e14\u6bcf\u4e00\u4e2a\u4efb\u52a1\u6f5c\u5728\u4f1a\u542f\u52a8\u591a\u4e2a\u5e76\u884c\u67e5\u8be2\u670d\u52a1\uff0c\u8fd9\u4f1a\u4ea7\u751f\u975e\u5e38\u9ad8\u7684\u7cfb\u7edf\u8d1f\u8f7d\uff0c\u914c\u60c5\u4f7f\u7528\u3002\u4f60\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u7684\u65b9\u6cd5\uff0c\u7f13\u89e3\u542f\u52a8\u8fc7\u591a\u5e76\u884c\u6267\u884c\u670d\u52a1\u7684\u98ce\u9669\uff1a
\n\"file\"<\/p>\n
\u5141\u8bb8\u81ea\u52a8\u7edf\u8ba1\u4fe1\u606f\u6536\u96c6\u4efb\u52a1\u4f7f\u7528\u5e76\u53d1\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('CONCURRENT','AUTOMATIC')<\/code><\/pre>\n
\u8bbe\u7f6e\u5168\u5c40\u6027\u7684AUTO_DEGREE\uff1a<\/p>\n
exec dbms_stats.set_global_prefs('DEGREE', DBMS_STATS.AUTO_DEGREE)\n<\/code><\/pre>\n
\u6216\u8005\uff0c\u9488\u5bf9\u7279\u5b9a\u7684\u5927\u8868\uff1a<\/p>\n
exec dbms_stats.set_table_prefs(user, 'BIG_TABLE', 'DEGREE', DBMS_STATS.AUTO_DEGREE)<\/code><\/pre>\n
\u603b\u7ed3\uff1a<\/h3>\n
\u4e00\u822c\u6765\u8bf4\uff0c\u5982\u679c\u4f60\u6709\u5f88\u591a\u7684\u5927\u8868\uff0c\u65b9\u6cd51\u6700\u6709\u53ef\u80fd\u8ba9\u4f60\u5feb\u901f\u6536\u96c6\u3002\u5982\u679c\u4f60\u6709\u5927\u91cf\u7a7a\u95f2\u7684\u673a\u5668\u8d44\u6e90\u548c\u5927\u91cf\u7684\u5c0f\u8868\uff0c\u63a8\u8350\u65b9\u6cd52\u3002
\n\u65b9\u6cd53\u9700\u8981\u66f4\u52a0\u5c0f\u5fc3\uff0c\u907f\u514d\u542f\u52a8\u8fc7\u591a\u7684\u5e76\u884c\u6267\u884c\u670d\u52a1\u3002<\/p>\n
\"file\"<\/p>\n
\u539f\u6587\u6709\u65b9\u6cd5\u5bf9\u5e94\u8d44\u6e90\u4f7f\u7528\u60c5\u51b5\u7684\u6d4b\u8bd5\uff0c\u53ef\u4ee5\u53c2\u8003
\n\u539f\u6587\u94fe\u63a5\uff1ahttps:\/\/blogs.oracle.com\/optimizer\/post\/how-to-gather-optimizer-statistics-fast<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
\u901a\u5e38\u60c5\u51b5\u4e0b\uff0c\u53ef\u4ee5\u901a\u8fc7\u8c03\u6574\u91c7\u6837\u6bd4\u4f8b\uff0c\u589e\u52a0\u5e76\u884c\u5ea6\u5f97\u65b9\u5f0f<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-1959","post","type-post","status-publish","format-standard","hentry","category-oracle-19c"],"_links":{"self":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1959","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=1959"}],"version-history":[{"count":3,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1959\/revisions"}],"predecessor-version":[{"id":1965,"href":"http:\/\/www.821121.com\/index.php?rest_route=\/wp\/v2\/posts\/1959\/revisions\/1965"}],"wp:attachment":[{"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1959"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1959"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.821121.com\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1959"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}