Distribution Manager cannot update the content in the site database. - Review the preceding status messages for this component ...

1. Distribution Manager cannot update the content in the site database.
     - Review the preceding status messages for this component and look for SQL Server errors.
     - Verify that this computer can access the SQL Server computer.
     - Verify that SQL Server services are running. 
     - Verify that Configuration Manager can access the site database.
     - Verify that the site database, transaction log, and tempdb are not full.
     - Verify that there are at least 50 SQL Server user connections, plus 5 for each Configuration Manager Administrator console.
    If the problem persists, check the SQL Server error logs.
2. Low disk space on the drive containing the content source files. Make more space available on that drive.
3. The content source files are being written to a remote computer that is not accessible. Ensure that the remote computer is running and accessible.
4. The content source files exist, but Configuration Manager no longer has access to the folder or files. Verify that distribution manager can access the content source folder and distribution point.
5. The content source files exist, but they are corrupt. Delete the files and replace them with backup copies. If you ignore this problem, Configuration Manager will likely fix it and complete this operation at a later time. If this error occurs repeatedly, refer to the Configuration Manager documentation or the Microsoft Knowledge Base for additional troubleshooting information.