How to fix Error 3468 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: SQL Server Error 3468 – Log Record Application Failure

Why This Error Happens

Error 3468 occurs during redo or undo operations when the SQL Server Storage Engine encounters a log record it cannot apply to a database page, typically because the transaction log or the database data file has become corrupted. This can result from abrupt storage failures, disk subsystem errors, faulty I/O filter drivers, or power loss during an active write operation. It frequently surfaces during crash recovery, log shipping, Always On Availability Group synchronization, or database restore operations when the log chain is broken or a page checksum mismatch is detected.

Step-by-Step Resolution Guide

Step 1: Examine the SQL Server Error Log for Context

  • Open SQL Server Management Studio (SSMS) and navigate to Management > SQL Server Logs, or review the raw log file located at C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG.
  • Search for accompanying messages referencing Error 824 (page checksum failure) or Error 9004 (log corruption), which often precede or follow 3468.
  • Note the Database ID, File ID, and Page ID referenced in the error — this pinpoints the exact corrupted object.

Step 2: Run DBCC CHECKDB to Assess Corruption Scope

  • Open a new query window in SSMS and run:
  DBCC CHECKDB ('YourDatabaseName') WITH NO_INFOMSGS, ALL_ERRORMSGS;
  • Review the output for allocation or consistency errors tied to the same Page ID found in Step 1.
  • If corruption is confirmed, avoid further writes to the database until a recovery plan is finalized.

Step 3: Restore from a Known-Good Backup

  • Identify the last verified full backup and any subsequent differential/log backups using:
  RESTORE HEADERONLY FROM DISK = 'D:\Backups\YourDatabase_Full.bak';
  • Restore the database using WITH NORECOVERY, then apply transaction log backups sequentially, finishing with WITH RECOVERY.
  • If no clean backup exists, attempt DBCC CHECKDB ('YourDatabaseName') WITH REPAIR_ALLOW_DATA_LOSS only as a last resort, since this may discard corrupted pages permanently.

Step 4: Validate Underlying Storage Health

  • Check Windows Event Viewer under Windows Logs > System for Disk or NTFS warnings (Event ID 7, 51, or 153), which indicate hardware-level I/O failures.
  • Run chkdsk D: /f /r (replace with your data drive letter) during a scheduled maintenance window to repair file system-level errors.
  • If using virtualized or SAN storage, confirm with your storage administrator that no recent failover, snapshot rollback, or firmware update coincided with the corruption event.

Step 5: Reconfigure Log Shipping or Always On Settings (If Applicable)

  • If the error occurred during Always On Availability Group synchronization, remove the affected database from the availability group temporarily.
  • Re-initialize the secondary replica using a fresh full backup and re-join it to the AG via SSMS > Always On High Availability > Add Database.
  • For log shipping, re-establish the baseline by generating a new full backup and restoring it on the secondary server before resuming log backup jobs.

Alternative or Verification Steps

  • After restoring or repairing, re-run DBCC CHECKDB ('YourDatabaseName') WITH NO_INFOMSGS to confirm zero allocation or consistency errors are returned.
  • If corruption recurs on the same volume, run a full hardware diagnostic (e.g., Storage Diagnostic Tool or vendor-specific RAID utility) to rule out a failing disk before returning the database to production.