{"id":201,"date":"2011-10-13T20:34:40","date_gmt":"2011-10-13T12:34:40","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=201"},"modified":"2011-10-13T20:34:40","modified_gmt":"2011-10-13T12:34:40","slug":"%e6%95%b0%e6%8d%ae%e5%ba%93%e5%87%ba%e7%8e%b0%e5%be%88%e9%ab%98%e7%9a%84enq-dx-contention-%e7%ad%89%e5%be%85","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=201","title":{"rendered":"\u6570\u636e\u5e93\u51fa\u73b0\u5f88\u9ad8\u7684enq: DX – contention \u7b49\u5f85"},"content":{"rendered":"

\u68c0\u67e5\u5ba2\u6237AWR\u62a5\u544a\u65f6\uff0c\u53d1\u73b0\u6570\u636e\u5e93\u7ecf\u5386\u4e25\u91cd\u7684enq: DX \u2013 contention\u7b49\u5f85\u3002<\/p>\n

\u8fd9\u4e2a\u6570\u636e\u5e93\u7684\u7248\u672c\u662f11.1.0.6 for Windows 64bits for AMD\uff0c\u5728AWR\u62a5\u544a\u4e2d\uff0cTOP 5\u7b49\u5f85\u4e8b\u4ef6\u4e3a\uff1a<\/p>\n\n\n\n\n\n\n\n\n
\n

Event<\/strong><\/p>\n<\/td>\n

\n

Waits<\/strong><\/p>\n<\/td>\n

\n

Time(s)<\/strong><\/p>\n<\/td>\n

\n

Avg wait (ms)<\/strong><\/p>\n<\/td>\n

\n

% DB time<\/strong><\/p>\n<\/td>\n

\n

Wait Class<\/strong><\/p>\n<\/td>\n<\/tr>\n

\n

enq: DX – contention<\/p>\n<\/td>\n

\n

22,627<\/p>\n<\/td>\n

\n

135,751<\/p>\n<\/td>\n

\n

6000<\/p>\n<\/td>\n

\n

126.41<\/p>\n<\/td>\n

\n

Other<\/p>\n<\/td>\n<\/tr>\n

\n

inactive transaction branch<\/p>\n<\/td>\n

\n

22,625<\/p>\n<\/td>\n

\n

22,626<\/p>\n<\/td>\n

\n

1000<\/p>\n<\/td>\n

\n

21.07<\/p>\n<\/td>\n

\n

Other<\/p>\n<\/td>\n<\/tr>\n

\n

db file scattered read<\/p>\n<\/td>\n

\n

1,312,470<\/p>\n<\/td>\n

\n

4,212<\/p>\n<\/td>\n

\n

3<\/p>\n<\/td>\n

\n

3.92<\/p>\n<\/td>\n

\n

User I\/O<\/p>\n<\/td>\n<\/tr>\n

\n

DB CPU<\/p>\n<\/td>\n

\u00a0<\/td>\n\n

3,928<\/p>\n<\/td>\n

\u00a0<\/td>\n\n

3.66<\/p>\n<\/td>\n

\u00a0<\/td>\n<\/tr>\n
\n

db file sequential read<\/p>\n<\/td>\n

\n

1,349,206<\/p>\n<\/td>\n

\n

3,522<\/p>\n<\/td>\n

\n

3<\/p>\n<\/td>\n

\n

3.28<\/p>\n<\/td>\n

\n

User I\/O<\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n

\u5176\u4e2d\u4ee5enq: DX \u2013 contention\u7b49\u5f85\u6700\u4e3a\u4e25\u91cd\uff0c\u5176\u5b9e\u662finactive transaction branch\u3002\u800c\u8fd9\u4e24\u4e2a\u7b49\u5f85\u4e8b\u4ef6\u5e73\u5747\u7b49\u5f85\u65f6\u95f4\u5206\u522b\u662f6\u79d2\u548c1\u79d2\uff0c\u5e73\u5747\u7b49\u5f85\u65f6\u95f4\u8fd9\u4e48\u6574\uff0c\u663e\u7136\u4e0d\u662f\u5076\u7136\uff0c\u8fd9\u8bf4\u660e\u8fd9\u4e24\u4e2a\u7b49\u5f85\u65f6\u95f4\u90fd\u7ecf\u5386\u4e86\u5404\u81ea\u7684\u8d85\u65f6\u65f6\u95f4\u3002<\/p>\n

\u67e5\u8be2metalink\uff0c\u8fd9\u4e2a\u95ee\u9898\u4e5f\u662fBUG\u6240\u81f4\uff0c\u5728\u6587\u6863High CPU by Sessions Holding DX Enqueue; Others Waiting ‘enq: DX – contention’ [ID 1275884.1]\u4e2d\u63cf\u8ff0\u4e86\u8fd9\u4e2a\u9519\u8bef\u3002<\/p>\n

\u5bfc\u81f4\u95ee\u9898\u7684\u539f\u56e0\u662f\u4e00\u4e9b\u6301\u6709\u5206\u5e03\u5f0f\u4e8b\u52a1\u961f\u5217\u7684\u7528\u6237\u5c1d\u8bd5\u4e2d\u6b62\u6216\u9000\u51fa\u5206\u5e03\u5f0f\u4e8b\u52a1\uff0cOracle\u5728\u5904\u7406\u7684\u65f6\u5019\u5360\u7528\u4e86\u5927\u91cf\u7684CPU\u8d44\u6e90\u3002<\/p>\n

\u800c\u7528\u6765\u5224\u65ad\u662f\u5426\u51fa\u73b0\u8fd9\u4e2a\u95ee\u9898\u7684\u6807\u5fd7\u662f\uff0c\u6570\u636e\u5e93\u4e2d\u51fa\u73b0\u4e86\u660e\u663e\u7684enq: DX \u2013 contention\u548cinactive transaction branch\u7b49\u5f85\u4e8b\u4ef6\u3002<\/p>\n

\u8fd9\u4e2a\u95ee\u9898\u5f71\u54cd10.2\u548c11.1\u7248\u672c\uff0c\u572811.2\u4e2d\u88abFIXED\u3002\u53ef\u4ee5\u901a\u8fc7\u6253\u5355\u72ec\u76848552942\u7684\u8865\u4e01\u6765\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u3002<\/p>\n

 <\/p>\n

 <\/p>\n","protected":false},"excerpt":{"rendered":"

\u68c0\u67e5\u5ba2\u6237AWR\u62a5\u544a\u65f6\uff0c\u53d1\u73b0\u6570\u636e\u5e93\u7ecf\u5386\u4e25\u91cd\u7684enq: DX \u2013 contention\u7b49\u5f85\u3002 \u8fd9\u4e2a\u6570\u636e\u5e93\u7684\u7248\u672c\u662f11.1.0.6 for Windows 64bits for AMD\uff0c\u5728AWR\u62a5\u544a\u4e2d\uff0cTOP 5\u7b49\u5f85\u4e8b\u4ef6\u4e3a\uff1a Event Waits Time(s) Avg wait (ms) % DB time Wait Class enq: DX – contention 22,627 135,751 6000 126.41 Other inactive transaction branch 22,625 22,626 1000 21.07 Other db … Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_newsletter_access":"","_jetpack_dont_email_post_to_subs":false,"_jetpack_newsletter_tier_id":0,"_jetpack_memberships_contains_paywalled_content":false,"_jetpack_memberships_contains_paid_content":false,"footnotes":""},"categories":[5],"tags":[141,142],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2yiY3-3f","_links":{"self":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/201"}],"collection":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=201"}],"version-history":[{"count":2,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/201\/revisions"}],"predecessor-version":[{"id":203,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/201\/revisions\/203"}],"wp:attachment":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=201"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=201"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=201"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}