How to fix Error 4218 on Windows Server 2025 / Windows 11

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Troubleshooting Guide: Error 4218 – Bulk-Logged Operations Exist in Database

Why This Error Happens

This error occurs because the database is using the Bulk-Logged recovery model, and a minimally logged (bulk) operation was performed since the last log backup. SQL Server blocks a subsequent BACKUP LOG operation in certain scenarios—such as when the log backup is being used for point-in-time restore chains or mirrored/Always On configurations—because bulk-logged transactions cannot be replayed to an exact point in time. This safeguard prevents data integrity issues on secondary replicas or during granular restores.

Step-by-Step Resolution Guide

Step 1: Identify the Recovery Model and Bulk Operations

  • Open SQL Server Management Studio (SSMS) or Azure Data Studio and connect to the SQL Server 2025 instance.
  • Run the following query to check the current recovery model:
  SELECT name, recovery_model_desc FROM sys.databases WHERE name = 'YourDatabaseName';
  • Confirm if BULK_LOGGED is set, and check recent operations like BULK INSERT, SELECT INTO, or index rebuilds with TF 610 enabled.

Step 2: Switch to FULL Recovery Model (If Point-in-Time Recovery Is Required)

  • Execute the following T-SQL command to change the recovery model:
  ALTER DATABASE YourDatabaseName SET RECOVERY FULL;
  • This ensures all future transactions are fully logged, allowing uninterrupted point-in-time restores and compatibility with Always On Availability Groups.
  • Note: This step requires a subsequent full or differential backup to re-establish the log chain.

Step 3: Perform a Full or Differential Backup Before Retrying Log Backup

  • Since switching recovery models breaks the log backup chain, take a full backup immediately:
  BACKUP DATABASE YourDatabaseName TO DISK = 'C:\Backups\YourDatabaseName_Full.bak';
  • Once the full backup completes, attempt the transaction log backup again:
  BACKUP LOG YourDatabaseName TO DISK = 'C:\Backups\YourDatabaseName_Log.trn';

Step 4: Verify Always On / Mirroring Compatibility (If Applicable)

  • If the database is part of an Always On Availability Group, confirm that the Bulk-Logged recovery model is not being used, as it is unsupported for synchronous replicas requiring point-in-time recovery.
  • Check replica health in SSMS under Always On High Availability > Availability Group Dashboard.
  • Adjust the recovery model on the primary replica only, then allow synchronization to propagate to secondaries.

Alternative or Verification Steps

  • Verify the fix by running BACKUP LOG YourDatabaseName TO DISK = 'C:\Backups\Test_Log.trn'; and confirming it completes without Error 4218.
  • If the issue persists, check the SQL Server Error Log (C:\Program Files\Microsoft SQL Server\MSSQL17.MSSQLSERVER\MSSQL\Log\ERRORLOG) for additional context on blocked bulk operations or replica synchronization failures.