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Remove requirement for SQL CMD 🎉
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‎SQL Queries/maxdop_calculator.sql‎

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/*
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-- +----------------------------------------------------------------------------+
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-- | DBA Mastery |
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-- | dbamastery@outlook.com |
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-- | http://www.dbamastery.com |
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-- |----------------------------------------------------------------------------|
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-- | |
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-- |----------------------------------------------------------------------------|
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-- | DATABASE : SQL Server |
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-- | FILE : maxdop_calculator.sql |
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-- | CLASS : Performance tuning |
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-- | PURPOSE : Calculates the optimal value for MAXDOP (> SQL 2016 ) |
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-- | |
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-- | NOTE : As with any code, ensure to test this script in a development |
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-- | environment before attempting to run it in production. |
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-- | |
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-- | Based on Microsoft KB# 2806535: https://goo.gl/4FD9BH and |
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-- | MSDN MaxDOP calculator: https://goo.gl/hzyxY1 |
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-- +----------------------------------------------------------------------------+
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Copyright (c) 2019 DBA Mastery
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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SET NOCOUNT ON;
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USE MASTER;
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-- Dropping temp table in case it exists
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IF EXISTS (SELECT * FROM tempdb.dbo.sysobjects o WHERE o.XTYPE IN ('U') AND o.id = object_id(N'tempdb..#MaxDOPDB'))
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DROP TABLE #MaxDOPDB;
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DECLARE @SQLVersion INT, @NumaNodes INT, @NumCPUs INT, @MaxDop SQL_VARIANT, @RecommendedMaxDop INT;
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-- Getting SQL Server version
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SELECT @SQLVersion = SUBSTRING(CONVERT(VARCHAR, SERVERPROPERTY('ProductVersion')), 1, 2);
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-- Getting number of NUMA nodes
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SELECT @NumaNodes = COUNT(DISTINCT memory_node_id) FROM sys.dm_os_memory_clerks WHERE memory_node_id != 64;
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-- Getting number of CPUs (cores)
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SELECT @NumCPUs = COUNT(scheduler_id) FROM sys.dm_os_schedulers WHERE status = 'VISIBLE ONLINE';
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-- Getting current MAXDOP at instance level
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SELECT @MaxDop = value_in_use FROM sys.configurations WHERE name = 'max degree of parallelism';
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-- MAXDOP calculation (Instance level)
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-- If SQL Server has a single NUMA node
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IF @NumaNodes = 1
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BEGIN
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IF @NumCPUs < 8
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-- If the number of logical processors is less than 8, MAXDOP equals the number of logical processors
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SET @RecommendedMaxDop = @NumCPUs;
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ELSE
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-- Keep MAXDOP at 8
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SET @RecommendedMaxDop = 8;
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END;
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ELSE
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BEGIN
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-- If SQL Server has multiple NUMA nodes
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IF (@NumCPUs / @NumaNodes) < 8
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-- If the number of logical processors per NUMA node is less than 8, MAXDOP equals or below logical processors per NUMA node
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SET @RecommendedMaxDop = (@NumCPUs / @NumaNodes);
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ELSE
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-- If greater than 8 logical processors per NUMA node - Keep MAXDOP at 8
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SET @RecommendedMaxDop = 8;
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END;
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-- If SQL Server is > 2016
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IF CONVERT(INT, @SQLVersion) > 12
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BEGIN
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-- Getting current MAXDOP at database level
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-- Creating temp table
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CREATE TABLE #MaxDOPDB
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(
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DBName sysname,
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configuration_id INT,
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name NVARCHAR(120),
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value_for_primary SQL_VARIANT,
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value_for_secondary SQL_VARIANT
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);
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INSERT INTO #MaxDOPDB
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EXEC sp_msforeachdb 'USE [?]; SELECT DB_NAME(), configuration_id, name, value, value_for_secondary FROM sys.database_scoped_configurations WHERE name = ''MAXDOP''';
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-- Displaying database MAXDOP configuration
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PRINT '------------------------------------------------------------------------';
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PRINT 'MAXDOP at Database level:';
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PRINT '------------------------------------------------------------------------';
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SELECT CONVERT(VARCHAR(30), dbname) AS DatabaseName, CONVERT(VARCHAR(10), name) AS ConfigurationName, CONVERT(INT, value_for_primary) AS "MAXDOP Configured Value"
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FROM #MaxDOPDB
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WHERE dbname NOT IN ('master', 'msdb', 'tempdb', 'model');
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PRINT '';
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-- Displaying current and recommended MAXDOP
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PRINT '--------------------------------------------------------------';
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PRINT 'MAXDOP at Instance level:';
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PRINT '--------------------------------------------------------------';
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PRINT 'MAXDOP configured value: ' + CHAR(9) + CAST(@MaxDop AS CHAR);
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PRINT 'MAXDOP recommended value: ' + CHAR(9) + CAST(@RecommendedMaxDop AS CHAR);
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PRINT '--------------------------------------------------------------';
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PRINT '';
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IF (@MaxDop <> @RecommendedMaxDop)
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BEGIN
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PRINT 'In case you want to change MAXDOP to the recommended value, please use this script:';
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PRINT '';
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PRINT 'EXEC sp_configure ''max degree of parallelism'', ' + CAST(@RecommendedMaxDop AS CHAR);
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PRINT 'GO';
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PRINT 'RECONFIGURE WITH OVERRIDE;';
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END;
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END;
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ELSE
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BEGIN
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-- Displaying current and recommended MAXDOP
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PRINT '--------------------------------------------------------------';
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PRINT 'MAXDOP at Instance level:';
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PRINT '--------------------------------------------------------------';
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PRINT 'MAXDOP configured value: ' + CHAR(9) + CAST(@MaxDop AS CHAR);
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PRINT 'MAXDOP recommended value: ' + CHAR(9) + CAST(@RecommendedMaxDop AS CHAR);
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PRINT '--------------------------------------------------------------';
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PRINT '';
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IF (@MaxDop <> @RecommendedMaxDop)
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BEGIN
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PRINT 'In case you want to change MAXDOP to the recommended value, please use this script:';
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PRINT '';
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PRINT 'EXEC sp_configure ''max degree of parallelism'', ' + CAST(@RecommendedMaxDop AS CHAR);
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PRINT 'GO';
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PRINT 'RECONFIGURE WITH OVERRIDE;';
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END;
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END;

‎SQL Queries/maxdop_calculator_v2.sql‎

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