{"id":186,"date":"2016-09-20T17:02:33","date_gmt":"2016-09-20T23:02:33","guid":{"rendered":"http:\/\/www.aamirharoon.com\/?p=186"},"modified":"2016-09-20T17:02:33","modified_gmt":"2016-09-20T23:02:33","slug":"oracle-open-world-2016-notes","status":"publish","type":"post","link":"http:\/\/www.aamirharoon.com\/?p=186","title":{"rendered":"Advance Active Session History"},"content":{"rendered":"<p>I attended a session in Oracle Open World 2016 given by Kyle Hailey.<\/p>\n<p>In his presentation Kyle talked about how to measure database performance and what to look for when application is running slow.<\/p>\n<p>I am sharing few notes from his session:<\/p>\n<ul>\n<li>Counting is the key to v$active_session_history.<\/li>\n<\/ul>\n<p style=\"padding-left: 60px;\">DB Time ~= count(*)<\/p>\n<p style=\"padding-left: 60px;\">Average Active Session (AAS) = DB Time \/ elapsed<\/p>\n<ul>\n<li>AAS Formulas<\/li>\n<\/ul>\n<p style=\"padding-left: 60px;\">AAS &lt; 1 :\u00a0Database is not blocked<\/p>\n<p style=\"padding-left: 60px;\">AAS ~= 0 : Database basically idle<\/p>\n<p style=\"padding-left: 60px;\">AAS &lt; #\u00a0of CPUs :\u00a0CPU available<\/p>\n<p style=\"padding-left: 60px;\">AAS &gt; # of CPUs :\u00a0Could have performance problems<\/p>\n<p style=\"padding-left: 60px;\">AAS &gt;&gt; #\u00a0of CPUS :\u00a0There is a bottleneck<\/p>\n<p>Kyle provided following github link for all his scripts.<\/p>\n<p><a href=\"https:\/\/github.com\/khailey\/ashmasters\" target=\"_blank\">https:\/\/github.com\/khailey\/ashmasters<\/a><\/p>\n<p>This is the presentation given by him.<\/p>\n<p><iframe loading=\"lazy\" style=\"border: none;\" src=\"http:\/\/www.slideshare.net\/khailey\/slideshelf\" width=\"615px\" height=\"470px\" frameborder=\"0\" marginwidth=\"0\" marginheight=\"0\" scrolling=\"no\" allowfullscreen=\"allowfullscreen\"><\/iframe><\/p>\n<p>Cheers\u00a0<img loading=\"lazy\" decoding=\"async\" style=\"margin-left: 3px; margin-right: 3px; vertical-align: middle; -webkit-box-shadow: none; -moz-box-shadow: none; box-shadow: none;\" src=\"http:\/\/www.aamirharoon.com\/wp-content\/plugins\/wp-emoji-one\/icons\/1F600.png\" width=\"16\" height=\"16\" \/><\/p>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I attended a session in Oracle Open World 2016 given by Kyle Hailey. In his presentation Kyle talked about how to measure database performance and<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3,4],"tags":[],"class_list":["post-186","post","type-post","status-publish","format-standard","hentry","category-11gr2","category-12cr1"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v25.9 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Advance Active Session History - The Database Handyman<\/title>\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.aamirharoon.com\/?p=186\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Advance Active Session History - The Database Handyman\" \/>\n<meta property=\"og:description\" content=\"I attended a session in Oracle Open World 2016 given by Kyle Hailey. In his presentation Kyle talked about how to measure database performance and\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.aamirharoon.com\/?p=186\" \/>\n<meta property=\"og:site_name\" content=\"The Database Handyman\" \/>\n<meta property=\"article:published_time\" content=\"2016-09-20T23:02:33+00:00\" \/>\n<meta property=\"og:image\" content=\"http:\/\/www.aamirharoon.com\/wp-content\/plugins\/wp-emoji-one\/icons\/1F600.png\" \/>\n<meta name=\"author\" content=\"Aamir\" \/>\n<meta name=\"twitter:card\" content=\"summary_large_image\" \/>\n<meta name=\"twitter:creator\" content=\"@aamir814\" \/>\n<meta name=\"twitter:site\" content=\"@aamir814\" \/>\n<meta name=\"twitter:label1\" content=\"Written by\" \/>\n\t<meta name=\"twitter:data1\" content=\"Aamir\" \/>\n\t<meta name=\"twitter:label2\" content=\"Est. reading time\" \/>\n\t<meta name=\"twitter:data2\" content=\"1 minute\" \/>\n<script type=\"application\/ld+json\" class=\"yoast-schema-graph\">{\"@context\":\"https:\/\/schema.org\",\"@graph\":[{\"@type\":\"Article\",\"@id\":\"https:\/\/www.aamirharoon.com\/?p=186#article\",\"isPartOf\":{\"@id\":\"https:\/\/www.aamirharoon.com\/?p=186\"},\"author\":{\"name\":\"Aamir\",\"@id\":\"http:\/\/www.aamirharoon.com\/#\/schema\/person\/dbcd256c4a97c6e27b7cc408200a9b63\"},\"headline\":\"Advance Active Session History\",\"datePublished\":\"2016-09-20T23:02:33+00:00\",\"mainEntityOfPage\":{\"@id\":\"https:\/\/www.aamirharoon.com\/?p=186\"},\"wordCount\":122,\"commentCount\":0,\"publisher\":{\"@id\":\"http:\/\/www.aamirharoon.com\/#\/schema\/person\/dbcd256c4a97c6e27b7cc408200a9b63\"},\"image\":{\"@id\":\"https:\/\/www.aamirharoon.com\/?p=186#primaryimage\"},\"thumbnailUrl\":\"http:\/\/www.aamirharoon.com\/wp-content\/plugins\/wp-emoji-one\/icons\/1F600.png\",\"articleSection\":[\"Oracle Database 11gR2\",\"Oracle Database 12cR1\"],\"inLanguage\":\"en\",\"potentialAction\":[{\"@type\":\"CommentAction\",\"name\":\"Comment\",\"target\":[\"https:\/\/www.aamirharoon.com\/?p=186#respond\"]}]},{\"@type\":\"WebPage\",\"@id\":\"https:\/\/www.aamirharoon.com\/?p=186\",\"url\":\"https:\/\/www.aamirharoon.com\/?p=186\",\"name\":\"Advance Active Session History - 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