How to fix Error 4319 on Windows Server 2025 / Windows 11

by

Troubleshooting Guide: SQL Server Error 4319 – Interrupted Restore Sequence

Why This Error Happens

Error 4319 occurs when SQL Server detects that a previous RESTORE operation using WITH NORECOVERY was stopped before it could fully apply all the necessary transaction log or differential files to the database. This typically happens when a restore sequence is broken mid-process—for example, if a script fails, a connection drops, or a file in the sequence is skipped or applied out of order. Because the database is left in a “restoring” state expecting a specific Log Sequence Number (LSN), SQL Server blocks further restores until the sequence is corrected to prevent data corruption.

Step-by-Step Resolution Guide

Step 1: Verify the Current Database State

  • Open SSMS or run a query against the sys.databases system view to check the state of the target database.
  • Run the following T-SQL command to confirm the status:
  SELECT name, state_desc FROM sys.databases WHERE name = 'YourDatabaseName';
  • Confirm the status reads RESTORING. If it does, the sequence is indeed paused and waiting for the correct file.

Step 2: Identify the Correct LSN and Backup Chain

  • Determine the exact Log Sequence Number (LSN) where the restore stopped by querying the backup history.
  • Use the RESTORE HEADERONLY command on your backup files to check the FirstLSN and LastLSN values:
  RESTORE HEADERONLY FROM DISK = 'C:\Backups\YourDatabase_log.trn';
  • Ensure the backup file you intend to restore next starts exactly where the last successful restore left off.

Step 3: Restart the Restore Sequence from the Full Backup

  • Since the sequence integrity is broken, you generally cannot simply “resume” the interrupted file; you must restart the entire sequence.
  • Drop the current database or use WITH REPLACE to overwrite the existing files.
  • Re-run the restore starting from the Full backup, followed by the Differential (if applicable), ensuring every step except the final one uses WITH NORECOVERY:
  RESTORE DATABASE YourDatabaseName 
  FROM DISK = 'C:\Backups\YourDatabase_full.bak' 
  WITH NORECOVERY, REPLACE;

Step 4: Check File System and Storage Integrity

  • If the sequence continues to fail even after restarting, verify that the backup file (%ls referenced in the error) is not corrupted or locked by another process.
  • Check the Windows Server 2025 Event Viewer under Windows Logs > Application for any underlying disk I/O errors (Event ID 7 or 9) that might indicate the physical backup file is damaged.
  • Ensure the SQL Server service account has full Read/Write permissions on the backup folder path.

Alternative or Verification Steps

  • Verification: Once the final log file is restored using WITH RECOVERY, query sys.databases again to confirm the state_desc has changed from RESTORING to ONLINE.
  • Alternative: If the specific transaction log file is permanently lost or corrupted, you cannot proceed with an un-broken chain; you must restart the restore process using only the Full and Differential backups (bringing the DB online via WITH RECOVERY at that point), accepting the loss of transactions made after that differential backup.