How To Fix RSDL021 - Could not open connection to database system &

SAP Error Message - Details

• Message type: E = Error

• Message class: RSDL - BW DB Connect

• Message number: 021

• Message text: Could not open connection to database system &

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 RSDL021 - Could not open connection to database system & ?

  The SAP error message RSDL021, which states "Could not open connection to database system," typically indicates that there is an issue with the connection between the SAP system and the underlying database. This can occur for various reasons, and 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.
  Configuration Issues: Incorrect database connection parameters in the SAP system configuration (e.g., hostname, port, database name).
  Database Instance Not Running: The specific database instance that SAP is trying to connect to may not be running.
  Firewall Issues: Firewalls may be blocking the connection between the SAP application server and the database server.
  Resource Limitations: The database server may be experiencing resource limitations (e.g., memory, CPU) that prevent new connections.
  User Authentication Issues: The user credentials used to connect to the database may be incorrect or lack the necessary permissions.
  
  Solutions:
  
  Check Database Server Status: Ensure that the database server is up and running. You can do this by trying to connect to the database using a database client or checking the server status.
  Verify Connection Parameters: Check the connection parameters in the SAP system (e.g., DB connection settings in the SAP profile or transaction DBACOCKPIT) to ensure they are correct.
  Restart Database Instance: If the database instance is not running, restart it and check if the issue persists.
  Network Configuration: Ensure that there are no network issues preventing the SAP system from reaching the database server. This may involve checking network configurations and firewall settings.
  Check Resource Usage: Monitor the database server for resource usage and ensure it has enough resources to handle connections.
  Review User Credentials: Verify that the user credentials used for the database connection are correct and have the necessary permissions to access the database.
  
  Related Information:
  
  SAP Notes: Check SAP Notes for any specific patches or updates related to this error message. SAP frequently releases updates that may address known issues.
  Transaction Codes: Use transaction codes like DBACOCKPIT or SM21 to check logs and monitor database connections.
  Database Logs: Review the database logs for any errors or warnings that may provide additional context for the connection issue.
  SAP Support: If the issue persists after trying the above solutions, consider reaching out to SAP Support for further assistance.
  
  By systematically checking these areas, you should be able to identify and resolve the cause of the RSDL021 error message.