{"id":1136,"date":"2012-08-26T23:08:25","date_gmt":"2012-08-26T15:08:25","guid":{"rendered":"https:\/\/yangtingkun.net\/?p=1136"},"modified":"2012-09-17T09:02:01","modified_gmt":"2012-09-17T01:02:01","slug":"10-2%e5%87%ba%e7%8e%b0sql-memory-manager-latch%e7%b1%bb%e5%9e%8b%e7%9a%84latch-free","status":"publish","type":"post","link":"https:\/\/yangtingkun.net\/?p=1136","title":{"rendered":"10.2\u51fa\u73b0SQL Memory Manager latch\u7c7b\u578b\u7684latch free"},"content":{"rendered":"<p>\u5ba2\u6237\u73af\u5883\u51fa\u73b0\u4e86\u660e\u663e\u7684LATCH FREE\u7b49\u5f85\u4e8b\u4ef6\uff0c\u800c\u7b49\u5f85\u7684latch\u7c7b\u578b\u4e3asql memory manager latch\u3002<br \/>\n\u8be6\u7ec6\u7248\u672c\u4e3a10.2.0.5 RAC for Hp-ux\uff0c\u95ee\u9898\u51fa\u73b0\u65f6\uff0cAWR\u7684TOP 5\u4fe1\u606f\u4e3a\uff1a<br \/>\nEvent\tWaits\tTime(s)\tAvg Wait(ms)\t% Total Call Time\tWait Class<br \/>\nlatch free\t387,948\t1,686,005\t4,346\t60.8\tOther<br \/>\nCPU time\t\t219,941\t\t7.9<br \/>\ngc buffer busy\t19,927,407\t8,938\t0\t.3\tCluster<br \/>\ngc current block 2-way\t6,143,005\t5,328\t1\t.2\tCluster<br \/>\ndb file sequential read\t789,784\t4,744\t6\t.2\tUser I\/O<\/p>\n<p>\u5728TOP 5\u4e2dlatch free\u6240\u5360DBTIME\u7684\u6bd4\u4f8b\u5df2\u7ecf\u8d85\u8fc7\u4e8660\uff0c\u663e\u7136\u5728\u8fd9\u79cd\u60c5\u51b5\u4e0b\uff0c\u6570\u636e\u5e93\u65e0\u6cd5\u6b63\u5e38\u7684\u5904\u7406\u8bf7\u6c42\uff0c\u64cd\u4f5c\u7cfb\u7edf\u4e0aCPU\u5904\u4e8e100%\u7e41\u5fd9\u72b6\u6001\u3002<br \/>\n\u67e5\u8be2MOS\uff0c\u53d1\u73b0\u5bfc\u81f4\u95ee\u9898\u7684\u539f\u56e0\u5728\u4e8ePGA\u7684\u8bbe\u7f6e\u4e0d\u8db3\uff0c\u8be6\u89c1\u6587\u6863Bug 9732503  latch free waits for SQL Memory Manager latch \/ extra child cursors\uff0c\u867d\u7136\u5f53\u524d\u7684PGA\u547d\u4e2d\u7387\u5e76\u4e0d\u662f\u5f88\u4f4e\uff0c\u8fbe\u5230\u4e8696.88%\uff0c\u4e0d\u8fc7\u5176\u4ed6\u65b9\u9762\u90fd\u4e0ebug\u63cf\u8ff0\u7684\u975e\u5e38\u63a5\u8fd1\u3002<br \/>\n\u8fd9\u4e2abug\u5f71\u54cd\u7684\u7248\u672c\u5305\u62ec10.2.0.4\u300110.2.0.5\u548c11.2.0.1\uff0cOracle\u572811.2.0.2\u548c11.1.0.7\u4e2d\u88abFIXED\uff0c\u5bf9\u4e8e\u5f53\u524d10.2\u7684\u7248\u672c\uff0c\u6700\u7b80\u5355\u7684\u89e3\u51b3\u8fd9\u4e2a\u95ee\u9898\u7684\u65b9\u6cd5\u5c31\u662f\u63d0\u9ad8PGA_AGGREGATE_TARGET\u7684\u503c\u3002<br \/>\n\u5ba2\u6237\u5c06PGA_AGGREGATE_TARGET\u4ece5G\u8c03\u6574\u523010G\u540e\uff0c\u8fd9\u4e2a\u95ee\u9898\u6ca1\u6709\u518d\u6b21\u51fa\u73b0\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u5ba2\u6237\u73af\u5883\u51fa\u73b0\u4e86\u660e\u663e\u7684LATCH FREE\u7b49\u5f85\u4e8b\u4ef6\uff0c\u800c\u7b49\u5f85\u7684latch\u7c7b\u578b\u4e3asql memory manager latch\u3002 \u8be6\u7ec6\u7248\u672c\u4e3a10.2.0.5 RAC for Hp-ux\uff0c\u95ee\u9898\u51fa\u73b0\u65f6\uff0cAWR\u7684TOP 5\u4fe1\u606f\u4e3a\uff1a Event Waits Time(s) Avg Wait(ms) % Total Call Time Wait Class latch free 387,948 1,686,005 4,346 60.8 Other CPU time 219,941 7.9 gc buffer busy 19,927,407 8,938 0 .3 Cluster &hellip; <a href=\"https:\/\/yangtingkun.net\/?p=1136\">Continue reading <span class=\"meta-nav\">&rarr;<\/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":[3],"tags":[999,1000],"jetpack_featured_media_url":"","jetpack_sharing_enabled":true,"jetpack_shortlink":"https:\/\/wp.me\/p2yiY3-ik","_links":{"self":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1136"}],"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=1136"}],"version-history":[{"count":1,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1136\/revisions"}],"predecessor-version":[{"id":1137,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=\/wp\/v2\/posts\/1136\/revisions\/1137"}],"wp:attachment":[{"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1136"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1136"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/yangtingkun.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1136"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}