How to fix Error 3244 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 3244 – Descriptor Block Size Exceeded

Why This Error Happens

This error occurs when a BACKUP or RESTORE operation includes a media set name, backup set name, or description string that exceeds the internal buffer limit allocated for the backup descriptor block. SQL Server 2025 reserves a fixed-size structure to store metadata labels (name, description, and expiration info) within the media header, and when combined string lengths push past this boundary, the engine rejects the operation rather than truncating data silently. This is commonly triggered by automated backup scripts that dynamically concatenate timestamps, server names, and long descriptive text into the NAME or DESCRIPTION parameters.

Step-by-Step Resolution Guide

Step 1: Identify the Offending T-SQL Statement

  • Locate the exact BACKUP or RESTORE command in your maintenance plan, SQL Agent job, or script that triggered Error 3244.
  • Check SQL Server Error Logs via C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG for the exact timestamp and job correlation.
  • Review the NAME, DESCRIPTION, and MEDIANAME clauses for excessive length.

Step 2: Shorten the Name and Description Strings

  • Reduce the NAME parameter to under 128 characters and DESCRIPTION to under 255 characters as a safe practice.
  • Example corrected syntax:
  BACKUP DATABASE [YourDB] 
  TO DISK = N'D:\Backups\YourDB.bak' 
  WITH NAME = N'YourDB_Full', 
  DESCRIPTION = N'Nightly Full Backup';
  • Avoid dynamically appending full file paths, GUIDs, or verbose metadata into the description field.

Step 3: Update Automated Scripts and Maintenance Plans

  • Open SQL Server Management Studio (SSMS) and navigate to Management > Maintenance Plans.
  • Edit any Backup Task that uses dynamic string concatenation for naming conventions.
  • Replace verbose naming logic (e.g., @@SERVERNAME + DB_NAME() + GETDATE() + 'Full Backup of Production Database on Server...') with a standardized short-code naming convention.

Step 4: Validate Third-Party Backup Tool Configurations

  • If using tools like Veeam, Redgate, or Ola Hallengren’s Maintenance Solution, check the @BackupSoftware or naming template parameters in the stored procedure configuration.
  • Adjust the @CleanupTime or naming templates in CommandExecute procedures to shorten the generated string length.

Alternative or Verification Steps

  • Run the corrected BACKUP DATABASE command manually in SSMS to confirm Error 3244 no longer appears and the operation completes with the standard “percent processed” success messages.
  • If the error persists despite short strings, verify the MEDIANAME and MEDIADESCRIPTION parameters (if using a Media Set) separately, as these contribute to the same descriptor block size independently of the backup set name.