To achieve optimal tempdb performance, create multiple tempdb data file per processor core and limit the number of tempdb data files up to 8 if you have more than 8 CPU core. Key benefit of creating multiple tempdb per core is it enables SQL to split the I/O transactions across each data files and also prevent blocking when multiple CPU processors perform SQL operation simultaneously.
- Log into SQL via SQL Server Management Studio
- Click on New Query -> On the query page copy and paste the script at the end of the post -> click the blue check sign to validate the script -> click Execute if validation passed
- When the script runs successfully -> The Messages section would display number of tempdb files now available. This VM has 2 CPUs so 1 additional tempdb file created.
- To verify the additional tempdb -> Right-click tempdb under System Databases and click properties ->Click Files and notice the additional tempdev2 created with same file size.
Note: If you have more than 8 tempdb data files created, delete the data files after the eight (i.e. tempdev9 and above) by simply selecting each file and click remove.
Split SQL TempDB Script
| USE master GO CREATE TABLE #numprocs ( [Index] INT, [Name] VARCHAR(200), Internal_Value VARCHAR(50), Character_Value VARCHAR(200) ) DECLARE @BASEPATH VARCHAR(200) DECLARE @PATH VARCHAR(200) DECLARE @SQL_SCRIPT VARCHAR(500) DECLARE @CORES INT DECLARE @FILECOUNT INT DECLARE @SIZE INT DECLARE @GROWTH INT DECLARE @ISPERCENT INT INSERT INTO #numprocs EXEC xp_msver SELECT @CORES = Internal_Value FROM #numprocs WHERE [Index] = 16 PRINT @CORES SET @BASEPATH = (select SUBSTRING(physical_name, 1, CHARINDEX(N'tempdb.mdf', LOWER(physical_name)) - 1) DataFileLocation FROM master.sys.master_files WHERE database_id = 2 and FILE_ID = 1) PRINT @BASEPATH SET @FILECOUNT = (SELECT COUNT(*) FROM master.sys.master_files WHERE database_id = 2 AND TYPE_DESC = 'ROWS') SELECT @SIZE = size FROM master.sys.master_files WHERE database_id = 2 AND FILE_ID = 1 SET @SIZE = @SIZE / 128 SELECT @GROWTH = growth FROM master.sys.master_files WHERE database_id = 2 AND FILE_ID = 1 SELECT @ISPERCENT = is_percent_growth FROM master.sys.master_files WHERE database_id = 2 AND FILE_ID = 1 WHILE @CORES > @FILECOUNT BEGIN SET @SQL_SCRIPT = 'ALTER DATABASE tempdb ADD FILE ( FILENAME = ''' + @BASEPATH + 'tempdb' + RTRIM(CAST(@CORES as CHAR)) + '.ndf'', NAME = tempdev' + RTRIM(CAST(@CORES as CHAR)) + ', SIZE = ' + RTRIM(CAST(@SIZE as CHAR)) + 'MB, FILEGROWTH = ' + RTRIM(CAST(@GROWTH as CHAR)) IF @ISPERCENT > 0 SET @SQL_SCRIPT = @SQL_SCRIPT + '%' SET @SQL_SCRIPT = @SQL_SCRIPT + ')' EXEC(@SQL_SCRIPT) SET @CORES = @CORES - 1 END GO DROP TABLE #numprocs |
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