Create maxdop_calculator_v2.sql

https://github.com/dbamaster/DBA-Mastery/blob/master/MAXDOP%20Calculator/maxdop_calculator_v2.sql

SQL Queries/maxdop_calculator_v2.sql

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