How To Fix 00653 - No connection to database, session terminated

SAP Error Message - Details

• Message type: E = Error

• Message class: 00 -

• Message number: 653

• Message text: No connection to database, session terminated

Self-Explanatory Message

Since SAP believes that this specific error message is 'self-explanatory,' no more information has been given.The majority of messages in the SAP system have a message text, however this is frequently insufficient to comprehend or resolve the problem.

To make things easier, more detailed information is frequently added to describe the issue, how to fix it, and the necessary steps or configuration modifications.

Unfortunately, there isn't any extra information in this error notice.

What else can you do?

First, use our AnswerBot below to get a possible cause and solution (requires a premium subscription).

Also, review the in-depth Common Questions & Answers listed below; you could discover a solution there or be able to connect with others who have faced similar challenges.

You can also try searching the SAP support portal (support.sap.com) but you need a special user ID to access it. It is possible that an SAP support note exists that provides additional details about the mistake or even steps for fixing it.

Smart SAP Assistant

• What is the cause and solution for SAP error message 00653 - No connection to database, session terminated ?

  The SAP error message "00653 No connection to database, session terminated" indicates that the SAP system is unable to establish a connection to the underlying database. This can occur for various reasons, and understanding the cause is crucial for resolving the issue. Here are some common causes, potential solutions, and related information:
  Causes:
  
  Database Server Down: The database server may be down or not reachable due to network issues or server crashes.
  Configuration Issues: Incorrect configuration settings in the SAP system or database connection parameters.
  Resource Limitations: The database may be running out of resources (e.g., memory, disk space).
  Network Issues: Network problems between the SAP application server and the database server.
  Database Lock: The database may be locked or in a state that prevents new connections.
  Firewall or Security Settings: Firewalls or security settings may be blocking the connection to the database.
  
  Solutions:
  
  Check Database Status: Verify that the database server is up and running. You can do this by logging into the database directly or using monitoring tools.
  Review Configuration: Check the SAP system configuration (e.g., SAP Profile Parameters, DB Connection Settings) to ensure that the connection parameters are correct.
  Monitor Resources: Use database monitoring tools to check for resource usage and ensure that the database has sufficient memory and disk space.
  Network Troubleshooting: Test the network connection between the SAP application server and the database server. Use tools like ping or traceroute to diagnose network issues.
  Check Logs: Review the SAP and database logs for any error messages or warnings that could provide more context about the issue.
  Restart Services: If the database is unresponsive, consider restarting the database service. However, ensure that this is done during a maintenance window to avoid data loss.
  Firewall Settings: Ensure that any firewalls or security settings allow traffic between the SAP application server and the database server.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any known issues or patches related to this error message. SAP Notes often provide specific guidance for troubleshooting.
  Database Documentation: Refer to the documentation for the specific database being used (e.g., Oracle, SQL Server, HANA) for additional troubleshooting steps.
  SAP Community: Engage with the SAP Community forums for insights from other users who may have encountered similar issues.
  
  If the problem persists after trying the above solutions, it may be necessary to involve your SAP Basis team or database administrator for further investigation and resolution.