{"id":4687,"date":"2017-02-15T16:55:34","date_gmt":"2017-02-16T00:55:34","guid":{"rendered":"http:\/\/3.209.169.194\/blogs\/paul\/?p=4687"},"modified":"2026-02-04T12:53:57","modified_gmt":"2026-02-04T20:53:57","slug":"who-is-overriding-maxdop-1-on-the-instance","status":"publish","type":"post","link":"https:\/\/www.sqlskills.com\/blogs\/paul\/who-is-overriding-maxdop-1-on-the-instance\/","title":{"rendered":"Who is overriding MAXDOP 1 on the instance?"},"content":{"rendered":"<p style=\"text-align: justify;\">I had an email question: &#8220;how can latch waits for <em><a href=\"https:\/\/www.sqlskills.com\/help\/latches\/access_methods_dataset_parent\/\" target=\"_blank\" rel=\"noopener\">ACCESS_METHODS_DATASET_PARENT<\/a><\/em> occur when the instance MAXDOP is set to 1?&#8221; This shouldn&#8217;t happen, as that latch is only used for coordination between threads performing a parallel table\/index scan. However, just because the instance MAXDOP is set to 1, that doesn&#8217;t mean no parallelism can occur.<\/p>\n<p style=\"text-align: justify;\">Anyone can override the instance MAXDOP setting using a query hint.<\/p>\n<p style=\"text-align: justify;\">There are two ways to prevent this:<\/p>\n<ul style=\"text-align: justify;\">\n<li>Set the instance\u00a0<em>cost threshold for parallelism<\/em> setting to be extremely high, so no serial plans can be deemed expensive enough to run in parallel<\/li>\n<li>Make everyone run within a Resource Governor (Enterprise Edition only [Edit 2\/4\/26: in Standard Edition from SQL Server 2025 onward]) workload group that has the <em>MAX_DOP<\/em> set to 1<\/li>\n<\/ul>\n<p style=\"text-align: justify;\">Or you can figure out where the query hint is being used and remove it.<\/p>\n<p style=\"text-align: justify;\">In this post I&#8217;m going to show you a simple Extended Events session that will capture information about what&#8217;s causing <em><a href=\"http:\/\/www.sqlskills.com\/help\/waits\/cxpacket\/\" target=\"_blank\" rel=\"noopener\">CXPACKET<\/a><\/em> waits (you can&#8217;t have <em>ACCESS_METHOD_DATASET_PARENT<\/em> latch waits without <em>CXPACKET<\/em> waits happening too) and then refine it to use a less expensive event.<\/p>\n<p>First off I&#8217;ll set my MAXDOP to 1:<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nEXEC sp_configure &#039;show advanced options&#039;, 1;\r\nRECONFIGURE WITH OVERRIDE;\r\nGO\r\n\r\nEXEC sp_configure &#039;max degree of parallelism&#039;, 1;\r\nRECONFIGURE WITH OVERRIDE;\r\nGO\r\n\r\nSELECT &#x5B;name], &#x5B;value_in_use] FROM sys.configurations WHERE &#x5B;name] LIKE &#039;%degree%&#039;;\r\nGO\r\n<\/pre>\n<pre class=\"brush: plain; gutter: false; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nConfiguration option &#039;show advanced options&#039; changed from 0 to 1. Run the RECONFIGURE statement to install.\r\nConfiguration option &#039;max degree of parallelism&#039; changed from 0 to 1. Run the RECONFIGURE statement to install.\r\nname                       value_in_use\r\n-------------------------- -------------\r\nmax degree of parallelism  1\r\n<\/pre>\n<p style=\"text-align: justify;\">Then I&#8217;ll check for <em>CXPACKET<\/em> waits (using <a href=\"https:\/\/www.sqlskills.com\/blogs\/paul\/wait-statistics-or-please-tell-me-where-it-hurts\/\" target=\"_blank\" rel=\"noopener\">my waits query<\/a>) after running the following query, that scans a 6.7 million row table (you can get the <em>SalesDB<\/em> database from <a href=\"https:\/\/www.sqlskills.com\/sql-server-resources\/sql-server-demos\/\" target=\"_blank\" rel=\"noopener\">here<\/a>):<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nSELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000;\r\nGO\r\n<\/pre>\n<p>No <em>CXPACKET<\/em> waits.<\/p>\n<p>But if I add a <em>MAXDOP<\/em> query hint and then check for waits:<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nSELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000 OPTION (MAXDOP 8);\r\nGO\r\n<\/pre>\n<pre class=\"brush: plain; gutter: false; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nWaitType            Wait_S  Resource_S Signal_S WaitCount Percentage AvgWait_S AvgRes_S AvgSig_S Help\/Info URL\r\n------------------- ------- ---------- -------- --------- ---------- --------- -------- -------- ---------------------------------------------\r\nLATCH_EX            0.20    0.16       0.05     93        79.61      0.0022    0.0017   0.0005   https:\/\/www.sqlskills.com\/help\/waits\/LATCH_EX\r\nCXPACKET            0.05    0.05       0.00     16        20.00      0.0032    0.0032   0.0000   https:\/\/www.sqlskills.com\/help\/waits\/CXPACKET\r\n<\/pre>\n<p>And the instance MAXDOP was successfully overridden.<\/p>\n<p style=\"text-align: justify;\">Now I&#8217;ll set up a simple Extended Events session to track down the offending code (based on the query from <a href=\"https:\/\/www.sqlskills.com\/blogs\/paul\/determine-causes-particular-wait-type\/\" target=\"_blank\" rel=\"noopener\">here<\/a>). It&#8217;s very important that you query the\u00a0<em>sys.dm_xe_map_values<\/em> DMV to find the correct number to use in the query for the\u00a0<em>CXPACKET<\/em> wait, as these numbers often change from release to release, and even in Service Packs. For instance,\u00a0<em>CXPACKET<\/em> was 191 in SQL Server 2014 RTM, but is 190 in the 2014 build I&#8217;m using.<\/p>\n<p style=\"text-align: justify;\">Be very careful about running this in production, as the event will fire for *every* wait that occurs and so will likely affect your workload throughput, even though it&#8217;ll short-circuit if the wait isn&#8217;t <em>CXPACKET<\/em>. I&#8217;ll show you a better event to use lower down.<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nIF EXISTS (\r\n    SELECT * FROM sys.server_event_sessions\r\n        WHERE &#x5B;name] = N&#039;InvestigateWaits&#039;)\r\n    DROP EVENT SESSION &#x5B;InvestigateWaits] ON SERVER\r\nGO\r\n\r\nCREATE EVENT SESSION &#x5B;InvestigateWaits] ON SERVER\r\nADD EVENT &#x5B;sqlos].&#x5B;wait_info]\r\n(\r\n    ACTION (\r\n        sqlserver.client_hostname,\r\n        sqlserver.nt_username,\r\n        sqlserver.sql_text)\r\n    WHERE &#x5B;wait_type] = 190 -- CXPACKET only\r\n    AND &#x5B;opcode] = 1 -- Just the end wait events\r\n)\r\nADD TARGET &#x5B;package0].&#x5B;ring_buffer]\r\nWITH\r\n(\r\n    MAX_MEMORY = 50 MB,\r\n    MAX_DISPATCH_LATENCY = 5 SECONDS)\r\nGO\r\n\r\nALTER EVENT SESSION &#x5B;InvestigateWaits] ON SERVER STATE = START;\r\nGO\r\n<\/pre>\n<p style=\"text-align: justify;\">And then when I run the select statement again I can\u00a0look in the ring buffer and see the\u00a0events. I put in a <em>DISTINCT<\/em> to minimize the number of lines of output. The code is:<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nSELECT \r\n    DISTINCT (&#x5B;data1].&#x5B;value] (&#039;(.\/@timestamp)&#x5B;1]&#039;, &#039;datetime&#039;)) AS &#x5B;Time],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;client_hostname&quot;]\/value)&#x5B;1]&#039;, &#039;VARCHAR(MAX)&#039;) AS &#x5B;Host],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;nt_username&quot;]\/value)&#x5B;1]&#039;, &#039;VARCHAR(MAX)&#039;) AS &#x5B;User],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;sql_text&quot;]\/value)&#x5B;1]&#039;,&#039;VARCHAR(MAX)&#039;) AS &#x5B;Statement]\r\nFROM (\r\n    SELECT CONVERT (XML, &#x5B;target_data]) AS data\r\n    FROM sys.dm_xe_session_targets &#x5B;xst]\r\n    INNER JOIN sys.dm_xe_sessions &#x5B;xs]\r\n        ON &#x5B;xst].&#x5B;event_session_address] = &#x5B;xs].&#x5B;address]\r\n    WHERE &#x5B;xs].&#x5B;name] = N&#039;InvestigateWaits&#039;) AS t\r\nCROSS APPLY data.nodes(&#039;\/\/event&#039;) n (data1);\r\nGO\r\n<\/pre>\n<pre class=\"brush: plain; gutter: false; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nTime                    Host       User            Statement\r\n----------------------- ---------- --------------- ---------------------------------------------------------------------------------\r\n2017-02-16 00:20:16.937 APPLECROSS APPLECROSS\\Paul SELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000 OPTION (MAXDOP 8);\r\n2017-02-16 00:20:16.987 APPLECROSS APPLECROSS\\Paul SELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000 OPTION (MAXDOP 8);\r\n2017-02-16 00:20:16.937 APPLECROSS                 SELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000 OPTION (MAXDOP 8);\r\n<\/pre>\n<p style=\"text-align: justify;\">Cool &#8211; so that works, but the session will likely affect workload performance, as I mentioned above. A better event to use is <em>degree_of_parallelism<\/em>, which was introduced in SQL Server 2012 and only fires once per batch execution, rather than once for every wait that occurs.<\/p>\n<p>The updated event session is:<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nCREATE EVENT SESSION &#x5B;InvestigateWaits] ON SERVER\r\nADD EVENT &#x5B;sqlserver].&#x5B;degree_of_parallelism]\r\n(\r\n    ACTION (\r\n        sqlserver.client_hostname,\r\n        sqlserver.nt_username,\r\n        sqlserver.sql_text)\r\n    WHERE &#x5B;dop] &gt; 1 -- parallel plans\r\n)\r\nADD TARGET &#x5B;package0].&#x5B;ring_buffer]\r\nWITH\r\n(\r\n    MAX_MEMORY = 50 MB,\r\n    MAX_DISPATCH_LATENCY = 5 SECONDS)\r\nGO\r\n<\/pre>\n<p>And the code to parse the XML, and sample output from my query is:<\/p>\n<pre class=\"brush: sql; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nSELECT \r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/@timestamp)&#x5B;1]&#039;, &#039;datetime&#039;) AS &#x5B;Time],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/data&#x5B;@name=&quot;dop&quot;]\/value)&#x5B;1]&#039;, &#039;INT&#039;) AS &#x5B;DOP],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;client_hostname&quot;]\/value)&#x5B;1]&#039;, &#039;VARCHAR(MAX)&#039;) AS &#x5B;Host],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;nt_username&quot;]\/value)&#x5B;1]&#039;, &#039;VARCHAR(MAX)&#039;) AS &#x5B;User],\r\n    &#x5B;data1].&#x5B;value] (&#039;(.\/action&#x5B;@name=&quot;sql_text&quot;]\/value)&#x5B;1]&#039;,&#039;VARCHAR(MAX)&#039;) AS &#x5B;Statement]\r\nFROM (\r\n    SELECT CONVERT (XML, &#x5B;target_data]) AS data\r\n    FROM sys.dm_xe_session_targets &#x5B;xst]\r\n    INNER JOIN sys.dm_xe_sessions &#x5B;xs]\r\n        ON &#x5B;xst].&#x5B;event_session_address] = &#x5B;xs].&#x5B;address]\r\n    WHERE &#x5B;xs].&#x5B;name] = N&#039;InvestigateWaits&#039;) AS t\r\nCROSS APPLY data.nodes(&#039;\/\/event&#039;) n (data1);\r\nGO\r\n<\/pre>\n<pre class=\"brush: plain; gutter: false; title: ; toolbar: true; wrap-lines: true; notranslate\" title=\"\">\r\nTime                    DOP Host       User            Statement\r\n----------------------- --- ---------- --------------- ---------------------------------------------------------------------------------\r\n2017-02-16 00:36:37.347 8   APPLECROSS APPLECROSS\\Paul SELECT * FROM &#x5B;SalesDB].&#x5B;dbo].&#x5B;Sales] WHERE &#x5B;Quantity] &gt; 10000 OPTION (MAXDOP 8);\r\n<\/pre>\n<p>Pretty cool, eh?<\/p>\n<p style=\"text-align: justify;\">You can mess around with more complex code\u00a0that does things like grab\u00a0the <em>tsql_stack<\/em> action and then parses it out, and more information to identify the culprit, like the application name &#8211; however complex you want to get &#8211; but now you know the base event session to capture when the query hint is being used.<\/p>\n<p>Enjoy!<\/p>\n","protected":false},"excerpt":{"rendered":"<p>I had an email question: &#8220;how can latch waits for ACCESS_METHODS_DATASET_PARENT occur when the instance MAXDOP is set to 1?&#8221; This shouldn&#8217;t happen, as that latch is only used for coordination between threads performing a parallel table\/index scan. However, just because the instance MAXDOP is set to 1, that doesn&#8217;t mean no parallelism can occur. [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[66,73,101],"tags":[],"class_list":["post-4687","post","type-post","status-publish","format-standard","hentry","category-performance-tuning","category-query-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>Who is overriding MAXDOP 1 on the instance? - 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\/who-is-overriding-maxdop-1-on-the-instance\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Who is overriding MAXDOP 1 on the instance? - Paul S. Randal\" \/>\n<meta property=\"og:description\" content=\"I had an email question: &#8220;how can latch waits for ACCESS_METHODS_DATASET_PARENT occur when the instance MAXDOP is set to 1?&#8221; This shouldn&#8217;t happen, as that latch is only used for coordination between threads performing a parallel table\/index scan. However, just because the instance MAXDOP is set to 1, that doesn&#8217;t mean no parallelism can occur. 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