How To Fix TW633 - Disconnected from database

SAP Error Message - Details

• Message type: E = Error

• Message class: TW - R3trans - Messages

• Message number: 633

• Message text: Disconnected from database

What causes this issue?

R3trans could not logon to the database.

System Response

R3trans is cancelled.

How to fix this error?

Check the SQL Code and eliminate the cause.
In most cases the environment variables are incorrectly set.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message TW633 - Disconnected from database ?

  The SAP error message TW633, which indicates "Disconnected from database," typically arises when there is a loss of connection between the SAP application server and the database server. This can happen for various reasons, and understanding the cause is crucial for resolving the issue.
  Causes of TW633 Error
  
  
  Network Issues: Problems with the network connection between the SAP application server and the database server can lead to disconnections. This could be due to network outages, firewall settings, or routing issues.
  
  
  Database Server Down: If the database server is down for maintenance or has crashed, the SAP application will not be able to connect to it.
  
  
  Resource Limitations: The database server may be experiencing high load or resource limitations (CPU, memory, disk space), causing it to drop connections.
  
  
  Timeout Settings: If the connection timeout settings are too low, the application may disconnect from the database if it takes too long to respond.
  
  
  Configuration Issues: Incorrect configuration settings in the SAP system or the database can lead to connection problems.
  
  
  Database Maintenance: Scheduled maintenance or updates on the database can temporarily disrupt connections.
  
  
  Solutions to TW633 Error
  
  
  Check Network Connectivity: Ensure that the network connection between the SAP application server and the database server is stable. Use tools like ping or traceroute to diagnose network issues.
  
  
  Verify Database Status: Check if the database server is up and running. If it is down, restart the database service or contact your database administrator.
  
  
  Monitor Resource Usage: Use monitoring tools to check the resource usage on the database server. If it is overloaded, consider optimizing queries, increasing resources, or scheduling heavy jobs during off-peak hours.
  
  
  Adjust Timeout Settings: Review and adjust the connection timeout settings in the SAP system and the database configuration to allow for longer response times if necessary.
  
  
  Review Configuration: Ensure that the SAP and database configurations are correct. Check the connection parameters in the SAP system (e.g., DB connection settings in the instance profile).
  
  
  Check Logs: Review the SAP application logs and database logs for any error messages or warnings that could provide more context about the disconnection.
  
  
  Database Maintenance: If the disconnection is due to scheduled maintenance, coordinate with the database administration team to understand the maintenance window and plan accordingly.
  
  
  Restart SAP Services: In some cases, restarting the SAP application server or the database server may resolve transient issues.
  
  
  Related Information
  
  
  SAP Notes: Check SAP Notes for any known issues or patches related to the TW633 error. SAP frequently updates its knowledge base with solutions for common problems.
  
  
  Documentation: Refer to the official SAP documentation for troubleshooting database connectivity issues.
  
  
  Support: If the issue persists, consider reaching out to SAP support for further assistance, providing them with detailed logs and error messages.
  
  
  By systematically addressing the potential causes and applying the appropriate solutions, you can resolve the TW633 error and restore connectivity between your SAP application and the database.