How To Fix DB303 - System lock table is full

SAP Error Message - Details

• Message type: E = Error

• Message class: DB - Messages for logical databases and background processing

• Message number: 303

• Message text: System lock table is full

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.

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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.

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Smart SAP Assistant

• What is the cause and solution for SAP error message DB303 - System lock table is full ?

  The SAP error message DB303, which indicates that the "System lock table is full," typically arises when the database lock table has reached its maximum capacity. This can prevent new locks from being created, leading to issues with transactions that require locking mechanisms.
  Causes:
  
  High Lock Usage: A large number of transactions or processes are trying to acquire locks simultaneously, leading to saturation of the lock table.
  Long-Running Transactions: Transactions that hold locks for an extended period can contribute to filling up the lock table.
  Improper Lock Management: Applications or processes that do not release locks properly can lead to an accumulation of locks.
  Configuration Limits: The lock table size may be set too low for the volume of transactions being processed.
  
  Solutions:
  
  
  Increase Lock Table Size:
  
  You can increase the size of the lock table in the database configuration. This typically involves adjusting parameters in the database settings (e.g., enque/table_size in SAP).
  Consult your database administrator for the appropriate steps to increase the lock table size.
  
  
  
  Monitor and Optimize Transactions:
  
  Identify long-running transactions that may be holding locks unnecessarily and optimize them to complete faster.
  Use transaction codes like SM12 to monitor and manage locks. You can view and delete unnecessary locks if they are no longer needed.
  
  
  
  Review Application Logic:
  
  Ensure that your application logic is designed to acquire and release locks efficiently. Avoid holding locks longer than necessary.
  
  
  
  Regular Maintenance:
  
  Implement regular checks and maintenance routines to monitor lock usage and address potential issues before they escalate.
  
  
  
  Database Tuning:
  
  Work with your database administrator to tune the database for better performance and lock management.
  
  
  
  Related Information:
  
  
  Transaction Codes:
  
  SM12: Display and manage locks.
  SM21: Check system logs for any related issues.
  ST22: Analyze dumps that may provide insights into lock-related problems.
  
  
  
  SAP Notes: Check SAP Notes for any specific recommendations or patches related to lock table issues. You can search for relevant notes in the SAP Support Portal.
  
  
  Documentation: Refer to SAP documentation for detailed information on lock management and configuration settings.
  
  
  By addressing the underlying causes and implementing the suggested solutions, you can resolve the DB303 error and improve the overall performance of your SAP system.