{"id":4617,"date":"2016-05-09T07:50:44","date_gmt":"2016-05-09T14:50:44","guid":{"rendered":"http:\/\/3.209.169.194\/blogs\/paul\/?p=4617"},"modified":"2017-04-13T11:42:02","modified_gmt":"2017-04-13T18:42:02","slug":"announcing-the-comprehensive-sql-server-wait-types-and-latch-classes-library","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/announcing-the-comprehensive-sql-server-wait-types-and-latch-classes-library\/","title":{"rendered":"Announcing the comprehensive SQL Server Wait Types and Latch Classes Library"},"content":{"rendered":"<p>It&#8217;s finally ready!<\/p>\n<p>For the last two years, I&#8217;ve been working on-and-off on a new community resource. It was postponed during 2015 while I mentored 50+ people, but this year I&#8217;ve had a bunch of time to work on it.<\/p>\n<p>I present to the community\u00a0a comprehensive library of all wait types and latch classes that have existed since SQL Server 2005 (yes, it includes 2016 waits and latches).<\/p>\n<p>The idea is that over time, this website will have the following information about all wait types and latch classes:<\/p>\n<ul>\n<li>What they mean<\/li>\n<li>When they were added<\/li>\n<li>How they map into Extended Events (complete for all entries already)<\/li>\n<li>Troubleshooting information<\/li>\n<li>Example call stacks of where they occur inside SQL Server<\/li>\n<li>Email link for feedback and questions<\/li>\n<\/ul>\n<p>As of today, I have complete information for more than 225 common wait types (897 entries in the library) and 26 common latch classes (185 entries in the library),\u00a0and I&#8217;m adding more information constantly.<\/p>\n<p>If there&#8217;s one that I haven&#8217;t done yet, and you&#8217;re really interested in it, click the email link on the page to let me know. Also, if you&#8217;ve seen something be a bottleneck that I haven&#8217;t, let me know so I can update the relevant page too.<\/p>\n<p>I&#8217;m doing this because there is so little information about waits and latches available online and I know that people are constantly searching for information about them. This is very much a labor of love for me as wait statistics are now my favorite area to teach.<\/p>\n<p>Waiting until it&#8217;s complete isn&#8217;t feasible, so it&#8217;s open and available for use now!<\/p>\n<p>Check it out at <a href=\"https:\/\/www.SQLskills.com\/help\/waits\" target=\"_blank\">https:\/\/www.SQLskills.com\/help\/waits<\/a> and <a href=\"https:\/\/www.SQLskills.com\/help\/latches\" target=\"_blank\">https:\/\/www.SQLskills.com\/help\/latches<\/a>, or jump to some examples\u00a0<em><a href=\"https:\/\/www.sqlskills.com\/help\/waits\/pagelatch_ex\/\" target=\"_blank\">PAGELATCH_EX<\/a><\/em>, <em><a href=\"http:\/\/www.sqlskills.com\/help\/waits\/sos_scheduler_yield\/\" target=\"_blank\">SOS_SCHEDULER_YIELD<\/a><\/em>, <em><a href=\"http:\/\/www.sqlskills.com\/help\/waits\/writelog\/\" target=\"_blank\">WRITELOG<\/a>, <a href=\"http:\/\/www.sqlskills.com\/help\/waits\/cxpacket\/\" target=\"_blank\">CXPACKET<\/a><\/em>.<\/p>\n<p>Enjoy!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>It&#8217;s finally ready! For the last two years, I&#8217;ve been working on-and-off on a new community resource. It was postponed during 2015 while I mentored 50+ people, but this year I&#8217;ve had a bunch of time to work on it. I present to the community\u00a0a comprehensive library of all wait types and latch classes that [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[55,66,101],"tags":[],"class_list":["post-4617","post","type-post","status-publish","format-standard","hentry","category-latches","category-performance-tuning","category-wait-stats"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Announcing the comprehensive SQL Server Wait Types and Latch Classes Library - Paul S. Randal<\/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.sqlskills.com\/blogs\/paul\/announcing-the-comprehensive-sql-server-wait-types-and-latch-classes-library\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Announcing the comprehensive SQL Server Wait Types and Latch Classes Library - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"It&#8217;s finally ready! For the last two years, I&#8217;ve been working on-and-off on a new community resource. It was postponed during 2015 while I mentored 50+ people, but this year I&#8217;ve had a bunch of time to work on it. I present to the community\u00a0a comprehensive library of all wait types and latch classes that [&hellip;]\" \/>\n<meta property=\"og:url\" content=\"https:\/\/www.sqlskills.com\/blogs\/paul\/announcing-the-comprehensive-sql-server-wait-types-and-latch-classes-library\/\" \/>\n<meta property=\"og:site_name\" content=\"Paul S. 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