{"id":16245,"date":"2021-05-06T16:22:23","date_gmt":"2021-05-06T14:22:23","guid":{"rendered":"https:\/\/www.dbi-services.com\/blog\/dataplatformgeeks-virtual-symposium-sql-server-azure-sql-session-debugging-without-debugger\/"},"modified":"2025-10-01T11:55:35","modified_gmt":"2025-10-01T09:55:35","slug":"dataplatformgeeks-virtual-symposium-sql-server-azure-sql-session-debugging-without-debugger","status":"publish","type":"post","link":"https:\/\/www.dbi-services.com\/blog\/dataplatformgeeks-virtual-symposium-sql-server-azure-sql-session-debugging-without-debugger\/","title":{"rendered":"Virtual Symposium SQL Server &amp; Azure SQL &#8211; Session: Debugging without debugger"},"content":{"rendered":"<p>As a consultant at <a href=\"https:\/\/www.dbi-services.com\/\">dbi services<\/a> we can dedicate a significant part of our time to training and I took the opportunity today to attend an online conference.<br \/>\nIn this blog post, I will present this event and one of the sessions that particularly interested me.<\/p>\n<p>The event I followed is the <a href=\"https:\/\/www.dataplatformgeeks.com\/virtual-symposium-sql-server-azure-sql-may-2021\/\">Virtual Symposium &#8211; SQL Server &amp; Azure SQL<\/a> organized by <a href=\"https:\/\/www.dataplatformgeeks.com\/\">SQLServerGeeks.<\/a><br \/>\nIt&#8217;s a free event that can easily be followed on Zoom but also on YouTube by going to the organization&#8217;s channel: <a href=\"https:\/\/www.youtube.com\/user\/SQLServerGeeks\/\">DataPlatformGeeks &amp; SQLServerGeeks<\/a>.<br \/>\nThe event has three editions to suit your time zone \u2013 Americas which took place yesterday, EMEA today &amp; APAC tomorrow.<br \/>\nHere is today&#8217;s agenda.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_1_VirtualSymposium_Mai_2021.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-49821\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_1_VirtualSymposium_Mai_2021.png\" alt=\"\" width=\"559\" height=\"686\"><\/a><\/p>\n<p>The session I have been waiting for the most is &#8220;Debugging without debugger: investigating SQL Server\u2019s internal structures&#8221; by <a href=\"https:\/\/twitter.com\/Hugo_Kornelis\">Hugo Kornelis<\/a>.<\/p>\n<p>Hugo Kornelis is well known in the SQL Server community for the sessions he&#8217;s doing regularly at many events. He publishes a lot of resources related to Execution plans. You can have a look at some of his writing on his website and blog:<\/p>\n<ul>\n<li><a href=\"https:\/\/sqlserverfast.com\/\">SQLServerFast<\/a><\/li>\n<li><a href=\"https:\/\/sqlserverfast.com\/epr\/\">SQL Server Execution Plan Reference<\/a><\/li>\n<li><a href=\"https:\/\/sqlserverfast.com\/blog\/\">Hugo Kornelis Blog<\/a><\/li>\n<\/ul>\n<p>The goal of this presentation is to demonstrate how an internal worktable is stored on disk by SQL Server without using the Windows <a href=\"https:\/\/en.wikipedia.org\/wiki\/WinDbg\">Debugger<\/a>. The session is demo-oriented.<\/p>\n<p>Before going to the main topics Hugo starts with a demo of such a worktable with the &#8220;<a href=\"https:\/\/sqlserverfast.com\/epr\/window-spool\/\">Window Spool operator<\/a>&#8220;.<br \/>\nThis first demo shows the execution plan of a query using a <a href=\"https:\/\/docs.microsoft.com\/en-us\/sql\/t-sql\/queries\/select-over-clause-transact-sql\">SELECT &#8211; OVER clause<\/a>. Hugo goes into detail over each operator and describes how they cooperate together to build the final result set.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_Demo1-Small.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-49828\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_Demo1-Small.png\" alt=\"\" width=\"586\" height=\"330\"><\/a><\/p>\n<p>In the second demo, Hugo demonstrates how he used the SQL Server blocking mechanism to keep the query running &#8220;forever&#8221; while he can investigate the Window Spool worktable.<br \/>\nThis is a fairly straightforward demo but it is explained very clearly and I find it quite nice to see SQL Server locking presented like this.<\/p>\n<p>The third demo is about actually locating the internal worktable.<br \/>\nObserving the <a href=\"https:\/\/techcommunity.microsoft.com\/t5\/sql-server-support\/sql-server-extents-pfs-gam-sgam-and-iam-and-related-corruptions\/ba-p\/1606011\">Page Free Space<\/a> page of the TempDB database using <a href=\"https:\/\/techcommunity.microsoft.com\/t5\/sql-server\/how-to-use-dbcc-page\/ba-p\/383094\">DBCC PAGE<\/a> and using sys.dm_os_buffer_descriptors, Hugo is able to find a newly allocated object that is assumed to be used by the Window Spool operator.<br \/>\nI found this part very interesting. Hugo references a book he uses as reference material for decoding DBCC PAGE and investigating anything internal: <em>Inside Microsoft SQL Server 2005: The Storage Engine<\/em> by <a href=\"https:\/\/www.sqlserverinternals.com\/about-kalen\">Kalen Delaney<\/a>.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_The_Storage_Engine.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-49823\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_The_Storage_Engine.png\" alt=\"\" width=\"309\" height=\"377\"><\/a><\/p>\n<p>Although the book was published in 2005 it might indeed contain internal information that didn&#8217;t change much over time. Nowadays most of the books aimed at DBAs don&#8217;t go into such details because this kind of knowledge is not directly useful for day-to-day DBA tasks.<\/p>\n<p>I don&#8217;t know about the 2005 book but I own a copy of <em>Microsoft SQL Server 2012 Internals<\/em> also by Kalen Delaney. It is my go-to reference to understand how SQL Server works. This is a book I&#8217;d recommend for any DBA looking for internal information.<a href=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_Internals_2012.png\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-49822\" src=\"https:\/\/www.dbi-services.com\/blog\/wp-content\/uploads\/sites\/2\/2022\/04\/Blog22_Internals_2012.png\" alt=\"\" width=\"305\" height=\"373\"><\/a><\/p>\n<p>I&#8217;ll not describe the rest of the session as it&#8217;s going into detail inside data rows structures. I suggest you watch the whole session online on the <a href=\"https:\/\/www.youtube.com\/user\/SQLServerGeeks\">YouTube channel<\/a> when it will be available.<br \/>\nI really enjoyed this session, Hugo Kornelis is a great speaker, he managed to make a great presentation on a highly technical subject.<\/p>\n<p>This event has many great speakers and sessions. I would recommend anyone interested in SQL Server to attend.<br \/>\nIf you have some free time tomorrow have a look at the <a href=\"https:\/\/www.dataplatformgeeks.com\/virtual-symposium-sql-server-azure-sql-may-2021\/\">agenda<\/a> of the APAC sessions you might find something you want to watch. And it&#8217;s free.<\/p>\n<p>I&#8217;m looking forward to the next event big event organized by DataPlatformGeeks which is the <a href=\"https:\/\/dataplatformgeeks.com\/dps2021\/\">Data Platform Summit<\/a> scheduled in September 2021. I expect a lot of great content again.<\/p>\n\n\n<p>Written by <a href=\"https:\/\/www.linkedin.com\/in\/steven-naudet-aa540158\/\">Steven Naudet<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"<p>As a consultant at dbi services we can dedicate a significant part of our time to training and I took the opportunity today to attend an online conference. In this blog post, I will present this event and one of the sessions that particularly interested me. The event I followed is the Virtual Symposium &#8211; [&hellip;]<\/p>\n","protected":false},"author":26,"featured_media":16246,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[3271,229,99],"tags":[2326,2550,2327],"type_dbi":[],"class_list":["post-16245","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-azure","category-database-administration-monitoring","category-sql-server","tag-online-event","tag-sql-server-2","tag-virtual-symposium"],"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>Virtual Symposium SQL Server &amp; Azure SQL - Session: Debugging without debugger - dbi Blog<\/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.dbi-services.com\/blog\/dataplatformgeeks-virtual-symposium-sql-server-azure-sql-session-debugging-without-debugger\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Virtual Symposium SQL Server &amp; Azure SQL - Session: Debugging without debugger\" \/>\n<meta property=\"og:description\" content=\"As a consultant at dbi services we can dedicate a significant part of our time to training and I took the opportunity today to attend an online conference. 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