Create MaxDOP_Configuration_Check_AzureSQL.sql

Best Practice Checks/MaxDOP_Configuration_Check_AzureSQL.sql

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+-- more info:
+-- https://aka.ms/sqldbtipswiki#tip_id-1000
+-- https://aka.ms/sqldbtipswiki#tip_id-1010
+-- https://aka.ms/sqldbtipswiki#tip_id-1020
+-- https://techcommunity.microsoft.com/blog/azuresqlblog/changing-default-maxdop-in-azure-sql-database-and-azure-sql-managed-instance/1538528
+
+DECLARE @PrimaryMaxDop int, @SecondaryMaxDop int, @CpuCount int, @EffectiveMaxDOP int, @SchedulersCount int, @RecommendedMaxDOP int
+select @CpuCount = cpu_count, @SchedulersCount = scheduler_count from sys.dm_os_sys_info
+
+SELECT @PrimaryMaxDop = c.value,
+       @SecondaryMaxDop = c.value_for_secondary,
+	   @CpuCount = g.cpu_limit
+FROM sys.database_scoped_configurations AS c
+CROSS JOIN sys.dm_user_db_resource_governance AS g
+WHERE 
+      CAST(SERVERPROPERTY('EngineEdition') AS int) = 5
+      AND
+      c.name = N'MAXDOP'
+      AND
+      g.database_id = DB_ID()
+
+
+SET @EffectiveMaxDOP = @PrimaryMaxDop
+
+IF @EffectiveMaxDOP = 0
+      SET @EffectiveMaxDOP = @SchedulersCount;
+
+IF @CpuCount < @EffectiveMaxDOP
+      SET @RecommendedMaxDOP = @CpuCount;
+ELSE IF @EffectiveMaxDOP > 8 AND @CpuCount >= 8
+      SET @RecommendedMaxDOP = 8
+ELSE
+      SET @RecommendedMaxDOP = @EffectiveMaxDOP
+
+RAISERROR(N'Current MaxDOP: %d',0,1, @CurrentMaxDop)
+RAISERROR(N'Effective MaxDOP: %d',0,1, @EffectiveMaxDOP)
+RAISERROR(N'Cpu Count: %d',0,1, @CpuCount)
+
+IF @RecommendedMaxDOP = @PrimaryMaxDop AND ISNULL(@SecondaryMaxDop,@RecommendedMaxDOP) = @RecommendedMaxDOP
+      PRINT N'Nothing to change.'
+
+SELECT CONCAT(
+             'MAXDOP not in recomended range (primary: ', CAST(@PrimaryMaxDop AS varchar(2)),
+             ', secondary: ', ISNULL(CAST(@SecondaryMaxDop AS varchar(4)), 'NULL'), ')'
+             )
+       AS details
+    , CONCAT(N'ALTER DATABASE SCOPED CONFIGURATION SET MAXDOP = ' + CONVERT(nvarchar(4000), @RecommendedMaxDOP), ';'
+	 , ISNULL(CHAR(13) + CHAR(10) + N'ALTER DATABASE SCOPED CONFIGURATION FOR SECONDARY SET MAXDOP = ' + CONVERT(nvarchar(4000), @RecommendedMaxDOP), N''))
+WHERE (@PrimaryMaxDop NOT BETWEEN 1 AND 8)
+   OR
+   (@SecondaryMaxDop IS NOT NULL AND @SecondaryMaxDop NOT BETWEEN 1 AND 8)
+   OR
+   (@PrimaryMaxDop > @CpuCount)
+   OR
+   (@SecondaryMaxDop > @CpuCount)
+;