{"id":5003,"date":"2019-08-06T12:50:30","date_gmt":"2019-08-06T19:50:30","guid":{"rendered":"http:\/\/3.209.169.194\/blogs\/paul\/?p=5003"},"modified":"2019-08-06T13:18:32","modified_gmt":"2019-08-06T20:18:32","slug":"the-curious-case-of-what-is-the-wait-resource-000","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/the-curious-case-of-what-is-the-wait-resource-000\/","title":{"rendered":"The Curious Case of\u2026 what is the wait resource (0:0:0)?"},"content":{"rendered":"<p style=\"text-align: justify;\"><em>(The Curious Case of\u2026<\/em>\u00a0used to be part of our bi-weekly\u00a0<a href=\"https:\/\/www.sqlskills.com\/join-the-sqlskills-insider-community\/\" target=\"_blank\" rel=\"noopener noreferrer\">newsletter<\/a>\u00a0but we decided to make it a\u00a0regular blog post instead so it can sometimes be more frequent. It covers something interesting one of us encountered when working with a client, doing some testing, or were asked in a random question from the community.)<\/p>\n<p style=\"text-align: justify;\">On Twitter today under the #sqlhelp hash tag, a former student asked what is the wait resource (0:0:0)?<\/p>\n<p style=\"text-align: justify;\">This can show up in a couple of places:<\/p>\n<ul style=\"text-align: justify;\">\n<li>In the output from <em>sys.dm_exec_requests<\/em> in the <em>wait_resource<\/em> column when the <em>last_wait_type<\/em> is <em>PAGELATCH_EX<\/em> or <em>PAGELATCH_SH<\/em><\/li>\n<li>In the output from <em>sys.sysprocesses<\/em> in the <em>waitresource<\/em> column when the <em>lastwaittype<\/em> is <em>PAGELATCH_EX<\/em> or <em>PAGELATCH_SH<\/em><\/li>\n<\/ul>\n<p style=\"text-align: justify;\">(as <em>sys.sysprocesses<\/em> is basically the same code as the DMV under the covers)<\/p>\n<p style=\"text-align: justify;\">The simple answer is that in some cases of <em>PAGELATCH_SH<\/em> or <em>PAGELATCH_EX<\/em> waits in <em>tempdb<\/em>, the wait resource simply isn&#8217;t preserved by the code and so the wait resource for the last wait type is set to (0:0:0) in the output of those queries. It doesn&#8217;t mean anything special, and I&#8217;ve only ever seen it in <em>tempdb<\/em>. It&#8217;s been that way since SQL Server 2005 and is still there in all the latest versions today.<\/p>\n<p style=\"text-align: justify;\">Simple answer: ignore it and troubleshoot the other waits.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>(The Curious Case of\u2026\u00a0used to be part of our bi-weekly\u00a0newsletter\u00a0but we decided to make it a\u00a0regular blog post instead so it can sometimes be more frequent. It covers something interesting one of us encountered when working with a client, doing some testing, or were asked in a random question from the community.) On Twitter today [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[115,101],"tags":[],"class_list":["post-5003","post","type-post","status-publish","format-standard","hentry","category-the-curious-case-of","category-wait-stats"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>The Curious Case of\u2026 what is the wait resource (0:0:0)? - 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\/the-curious-case-of-what-is-the-wait-resource-000\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"The Curious Case of\u2026 what is the wait resource (0:0:0)? - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"(The Curious Case of\u2026\u00a0used to be part of our bi-weekly\u00a0newsletter\u00a0but we decided to make it a\u00a0regular blog post instead so it can sometimes be more frequent. It covers something interesting one of us encountered when working with a client, doing some testing, or were asked in a random question from the community.) 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