Fix: The transaction log for database is full due to 'log_backup' - Dynamics 365FO

If you're encountering the error "The transaction log for database is full due to 'log_backup'" while working with Dynamics 365 Finance and Operations (D365FO), it means your SQL Server transaction log has reached its maximum capacity.

Solution

Follow these steps to resolve the issue:

Step 1: Check the Database Files

Run the following SQL query to check the database file details:

    SELECT * FROM sys.database_files
    

Note down the log file name from the result and use that same name in the second statement of the step 2 SQL query.

Query result screenshot:

Step 2: Shrink the Transaction Log

Execute the following commands to shrink the transaction log and free up space:

    ALTER DATABASE AxDB SET RECOVERY SIMPLE;
    DBCC SHRINKFILE('AxDb_New_log', 0, TRUNCATEONLY);
    ALTER DATABASE AxDB SET RECOVERY FULL;
    

Replace 'AxDb_New_log' with the actual log file name you noted earlier.

Step 3: Start DB synchronization again...this time it should work

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Tip: Always ensure you have proper database backups before making changes to recovery models.