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Certain MDF files growing issues in TempDB


If you’re facing issues with TempDB in SQL Server, particularly with certain MDF files growing while others remain unaffected, it could indicate a problem with the allocation of database objects within TempDB. Here are a few steps you can take to investigate and address this issue:

Identify the problematic MDF files

Execute the following query to obtain information about the current file sizes and space usage in TempDB

USE TempDB; 
EXEC sp_helpfile;

Review the output to identify the MDF files that are growing disproportionately compared to others.

Determine the cause of the growth

  • Identify any active or long-running queries, jobs, or processes that may be responsible for excessive temporary object creation or usage in TempDB.
  • Check for any temporary tables or table variables that are being created and not properly dropped.
  • Monitor system activity to identify any specific workload patterns that may be contributing to the growth in certain MDF files.

Adjust TempDB file configuration

TempDB is typically configured with multiple data files to improve I/O performance. However, if you notice disproportionate growth in specific MDF files, you may need to adjust the file configuration.

Use the following steps to modify the number and size of TempDB data files:

Alter the number of files:

USE master;
       MODIFY FILE (NAME = logical_file_name, FILEGROWTH = size_in_MB);

Replace logical_file_name with the logical name of the MDF file, and size_in_MB with the desired size for the file growth.

Add additional files:

USE master;
       ADD FILE (NAME = logical_file_name, FILENAME = 'new_file_path', SIZE = size_in_MB, FILEGROWTH = size_in_MB);

Replace logical_file_name with the logical name for the new file, new_file_path with the desired path and filename for the new file, and size_in_MB with the initial size for the file.

Ensure that the total size of the files is appropriate for your workload and available disk space.

Monitor and troubleshoot:

  • After adjusting the TempDB file configuration, monitor the growth of the MDF files over time to ensure the issue has been resolved.
  • Continue monitoring the system and TempDB activity to identify any further anomalies or performance issues that may require investigation.

Remember, TempDB is a system database used for storing temporary objects and other system-related tasks in SQL Server. Monitoring its size and managing its configuration appropriately are crucial for maintaining optimal performance and avoiding issues related to disk space usage.