{"id":5713,"date":"2015-09-29T19:52:43","date_gmt":"2015-09-29T17:52:43","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/"},"modified":"2015-09-29T19:52:43","modified_gmt":"2015-09-29T17:52:43","slug":"nothing-in-feature-usage-statistics-since-12c","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/","title":{"rendered":"Nothing in feature usage statistics since 12c?"},"content":{"rendered":"<h2>By Franck Pachot<\/h2>\n<p>.<br \/>\nIt don&#8217;t want to rub salt in the wound about 12c upgrades and Adaptive Dynamic Sampling being overzealous, but here is a case with an unexpected consequence: you see nothing in the &#8216;Database Feature Usage&#8217; since migration.<br \/>\n<!--more--><br \/>\nThe photo novel starts like this:<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-1.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-1.png\" alt=\"orafu-1\" width=\"1316\" height=\"548\" class=\"alignnone size-full wp-image-4099\" \/><\/a><br \/>\nwe are in September and when I check the &#8216;Database Feature Usage&#8217; page I see nothing gathered since February.<\/p>\n<p>It&#8217;s quite embarrassing as this is the only way to ensure that I&#8217;m not using features that are not available with the license options I have.<\/p>\n<p>Well, I have Tuning Pack so I can use SQL Monitoring, and this is what I remark coincidentally:<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-3.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-3.png\" alt=\"orafu-3\" width=\"894\" height=\"264\" class=\"alignnone size-full wp-image-4101\" \/><\/a><\/p>\n<p>You see &#8216;DBMS_FEATURE&#8217; functions ending in ORA-12751 error after 20 minutes of heavy CPU usage.<\/p>\n<p>ORA-12751 is &#8220;cpu time or run time policy violation&#8221;, it&#8217;s an internal limit for queries run by MMON, such as the one that collects the features usage.<\/p>\n<p>This can explain why the feature usage is not collected. Let&#8217;s check the history about it:<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-2.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-2.png\" alt=\"orafu-2\" width=\"1088\" height=\"549\" class=\"alignnone size-full wp-image-4100\" \/><\/a><\/p>\n<p>Thanks to AWR that stores SQL Monitoring statistics, we can see that the function always fail. So why is it so long to run?<\/p>\n<p>Here is a pattern that we start to see a lot when upgrading to 12c.<\/p>\n<p>If you have attended to my &#8216;AWR straight to the goal&#8217; session then you know the path I follow: time model, top events, statements, etc.<br \/>\n(If you didn&#8217;t, then come to Birmingham in December at <a href=\"http:\/\/www.tech15.ukoug.org\/default.asp?p=12861&amp;dlgact=shwprs&amp;prs_prsid=10652&amp;day_dayid=94\">tech15<\/a> or in January at Oracle Midlands)<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-6.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-6.png\" alt=\"orafu-6\" width=\"592\" height=\"504\" class=\"alignnone size-full wp-image-4104\" \/><\/a><\/p>\n<p>lot of parsing time here&#8230;<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-5.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-5.png\" alt=\"orafu-5\" width=\"760\" height=\"279\" class=\"alignnone size-full wp-image-4103\" \/><\/a><\/p>\n<p>Lot of time in CPU and a small result cache contention&#8230;<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-7.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-7.png\" alt=\"orafu-7\" width=\"1107\" height=\"301\" class=\"alignnone size-full wp-image-4105\" \/><\/a><\/p>\n<p>One SQL query that takes all the time of the dbms feature call. Note that \/* DS_SVC *\/ is dynamic sampling&#8230;<\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-8.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-8.png\" alt=\"orafu-8\" width=\"1185\" height=\"193\" class=\"alignnone size-full wp-image-4106\" \/><\/a><\/p>\n<p><a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-9.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-9.png\" alt=\"orafu-9\" width=\"831\" height=\"220\" class=\"alignnone size-full wp-image-4107\" \/><\/a><\/p>\n<p>Let&#8217;s put it together: <\/p>\n<ul>\n<li>long hard parse<\/li>\n<li>result cache contention<\/li>\n<li>long dynamic sampling query<\/li>\n<\/ul>\n<p>This is Adaptive Dynamic Sampling. The feature usage function run a lot of queries on big tables (AWR history, RMAN history, etc) and the 12c ADS queries on those big tables are very long. Fortunately there is a timeout after 20 minutes. But the result is that we have no result: I cannot know which features are used.<\/p>\n<h3>So what?<\/h3>\n<p>The goal of this post is not to tune those internal queries. There is enough to do with production queries.<br \/>\nThe goal is to explain how it is possible to see nothing in DBA_FEATURE_USAGE_STATISTICS for past months.<br \/>\nNow, if you have an LMS auditor that find it suspicious, then you can prove that you did nothing bad&#8230; except upgrading to 12c \ud83d\ude09<br \/>\nWell, you should adapt the method presented here of course: don&#8217;t show an AWR report if you don&#8217;t have Diagnostic Pack!<\/p>\n<h3>Added 1st Oct. 2015<\/h3>\n<p>Of course, when you see a problem you check if the problem occurs elsewhere.<br \/>\nI was on a server with 50 12c instances and checked the CPU usage:<br \/>\n<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-10.png\"><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-10.png\" alt=\"orafu-10\" width=\"1306\" height=\"331\" class=\"alignnone size-full wp-image-4156\" \/><\/a><br \/>\nWhat happens around 14:30 is that a lot of instances are running that feature usage query. I&#8217;m not sure about that, but I think that the time when it run is determined by the instance startup time and on that server all instances have been started after a server maintenance.<\/p>\n<p>The query is: auyf8px9ywc6j<\/p>\n<pre><code>\nWITH SNAP_RANGES AS\n(SELECT \/*+ FULL(ST) *\/ SN.DBID ,SN.INSTANCE_NUMBER ,SN.STARTUP_TIME ,ST.STAT_ID ,ST.STAT_NAME ,MIN(SN.SNAP_ID) AS MIN_SNAP ,MAX(SN.SNAP_ID) AS MAX_SNAP ,MIN(CAST(BEGIN_INTERVAL_TIME AS DATE)) AS MIN_DATE ,MAX(CAST(END_INTERVAL_TIME AS DATE)) AS MAX_DATE\nFROM DBA_HIST_SNAPSHOT SN ,WRH$_STAT_NAME ST\nWHERE SN.BEGIN_INTERVAL_TIME &gt; TRUNC(SYSDATE) - 7 AND SN.END_INTERVAL_TIME &lt; TRUNC(SYSDATE) AND SN.DBID = ST.DBID AND ST.STAT_NAME IN (&#039;DB time&#039;, &#039;DB CPU&#039;) GROUP BY SN.DBID,SN.INSTANCE_NUMBER,SN.STARTUP_TIME,ST.STAT_ID,ST.STAT_NAME ) ,DELTA_DATA AS\n(SELECT SR.DBID ,SR.INSTANCE_NUMBER ,SR.STAT_NAME ,CASE WHEN SR.STARTUP_TIME BETWEEN SR.MIN_DATE AND SR.MAX_DATE THEN TM1.VALUE + (TM2.VALUE - TM1.VALUE) ELSE (TM2.VALUE - TM1.VALUE) END AS DELTA_TIME\nFROM WRH$_SYS_TIME_MODEL TM1 ,WRH$_SYS_TIME_MODEL TM2 ,SNAP_RANGES SR\nWHERE TM1.DBID = SR.DBID AND TM1.INSTANCE_NUMBER = SR.INSTANCE_NUMBER AND TM1.SNAP_ID = SR.MIN_SNAP AND TM1.STAT_ID = SR.STAT_ID AND TM2.DBID = SR.DBID AND TM2.INSTANCE_NUMBER = SR.INSTANCE_NUMBER AND TM2.SNAP_ID = SR.MAX_SNAP AND TM2.STAT_ID = SR.STAT_ID )\nSELECT STAT_NAME ,ROUND(SUM(DELTA_TIME\/1000000),2) AS SECS\nFROM DELTA_DATA GROUP BY STAT_NAME\n<\/code><\/pre>\n<p>It&#8217;s a query that gathers the following:<\/p>\n<pre><code>\nSTAT_NAME        SECS\n---------- ----------\nDB CPU       76451.04\nDB time     147707.98\n<\/code><\/pre>\n<p>but the problem is the Adaptive Dynamic Sampling that is behind.<\/p>\n<p>I&#8217;ve no solution yet, but Not-a-Bug number 14510010&#8243; suggests that the query is not run when _swrf_mmon_dbfus&#8221;=false but of course your usage of Diagnostic Pack will not be monitored.<\/p>\n<h3>Update June 6th, 2016<\/h3>\n<p>The best solution to the issue (following the Rule #1 of troubleshooting: the scope of the solution should match the scope of the problem) is on Ludovico Caldara blog post: <a href=\"http:\/\/www.ludovicocaldara.net\/dba\/cpu-usage-12c-dbms_feature_awr\/\">http:\/\/www.ludovicocaldara.net\/dba\/cpu-usage-12c-dbms_feature_awr\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>By Franck Pachot . It don&#8217;t want to rub salt in the wound about 12c upgrades and Adaptive Dynamic Sampling being overzealous, but here is a case with an unexpected consequence: you see nothing in the &#8216;Database Feature Usage&#8217; since migration.<\/p>\n","protected":false},"author":27,"featured_media":5723,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[229,59],"tags":[665,666,667,668,209],"type_dbi":[],"class_list":["post-5713","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-database-administration-monitoring","category-oracle","tag-adaptive","tag-ads","tag-audit","tag-lms","tag-oracle-12c"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.2 (Yoast SEO v27.2) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Nothing in feature usage statistics since 12c? - dbi Blog<\/title>\n<meta name=\"description\" content=\"Noting in feature usage statistics because of 12c Adaptive Dynamic Sampling\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Nothing in feature usage statistics since 12c?\" \/>\n<meta property=\"og:description\" content=\"Noting in feature usage statistics because of 12c Adaptive Dynamic Sampling\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\" \/>\n<meta property=\"og:site_name\" content=\"dbi Blog\" \/>\n<meta property=\"article:published_time\" content=\"2015-09-29T17:52:43+00:00\" \/>\n<meta property=\"og:image\" content=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-1-1.png\" \/>\n\t<meta property=\"og:image:width\" content=\"1316\" \/>\n\t<meta property=\"og:image:height\" content=\"548\" \/>\n\t<meta property=\"og:image:type\" content=\"image\/png\" \/>\n<meta name=\"author\" content=\"Oracle Team\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Oracle Team\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"4 minutes\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\"},\"author\":{\"name\":\"Oracle Team\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/#\/schema\/person\/66ab87129f2d357f09971bc7936a77ee\"},\"headline\":\"Nothing in feature usage statistics since 12c?\",\"datePublished\":\"2015-09-29T17:52:43+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\"},\"wordCount\":637,\"commentCount\":0,\"image\":{\"@id\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/#primaryimage\"},\"thumbnailUrl\":\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/orafu-1-1.png\",\"keywords\":[\"adaptive\",\"ADS\",\"audit\",\"LMS\",\"Oracle 12c\"],\"articleSection\":[\"Database Administration &amp; Monitoring\",\"Oracle\"],\"inLanguage\":\"en-US\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\",\"url\":\"https:\/\/www.dbi-services.com\/blog\/nothing-in-feature-usage-statistics-since-12c\/\",\"name\":\"Nothing in feature usage statistics since 12c? 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