How To Fix DB6124 - Too many lock waits occur in the system

SAP Error Message - Details

• Message type: E = Error

• Message class: DB6 - DB6: Alert Monitoring and Alert Configuration

• Message number: 124

• Message text: Too many lock waits occur in the system

2nd and 3rd block copies of blocks from DB6 123

What causes this issue?

These are situations in which an application (and therefore also a work
process) must wait for another application before being able to process
further commands.

System Response

Reduction of performance

How to fix this error?

You should perform a more detailed analysis of the applications (who is
locking, what is locked?), if the system develops performance
bottlenecks due to wait situations occurring too frequently. In this
context, note also the note of lock escalations, as these can also lead
to lock situations.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DB6124 - Too many lock waits occur in the system ?

  The SAP error message DB6124, which indicates "Too many lock waits occur in the system," typically arises when there are excessive lock requests in the database that are not being resolved in a timely manner. This can lead to performance issues and can affect the overall functionality of the SAP system.
  Causes:
  
  High Concurrency: Multiple transactions are trying to access the same data simultaneously, leading to contention for locks.
  Long-Running Transactions: Transactions that hold locks for an extended period can block other transactions, causing lock waits to accumulate.
  Deadlocks: Situations where two or more transactions are waiting for each other to release locks, leading to a standstill.
  Inefficient SQL Queries: Poorly optimized queries can lead to longer execution times and increased lock contention.
  Database Configuration: Inadequate database settings for handling concurrent transactions can exacerbate lock wait issues.
  
  Solutions:
  
  Analyze Lock Waits: Use transaction codes like SM12 (to view and manage locks) and SM21 (to check system logs) to identify which transactions are causing lock waits.
  Optimize Transactions: Review and optimize long-running transactions to ensure they complete quickly and release locks promptly.
  Improve SQL Performance: Analyze and optimize SQL queries to reduce execution time and lock duration. Use tools like the SQL Trace (ST05) to identify slow queries.
  Increase Lock Timeout: If appropriate, consider increasing the lock timeout settings in the database configuration to allow longer wait times before a transaction fails.
  Implement Lock Management Strategies: Use techniques such as lock escalation, partitioning, or reducing transaction scope to minimize lock contention.
  Monitor System Performance: Regularly monitor system performance and lock statistics to identify trends and potential issues before they escalate.
  Database Tuning: Work with your database administrator to tune the database settings for better concurrency handling.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to DB6124 for specific patches or recommendations from SAP.
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12, SM21, ST04 (database performance), and ST05 (SQL trace).
  Documentation: Review SAP documentation on database performance tuning and lock management for best practices.
  Support: If the issue persists, consider reaching out to SAP support for further assistance and guidance tailored to your specific environment.
  
  By addressing the underlying causes and implementing the suggested solutions, you can mitigate the occurrence of the DB6124 error and improve the overall performance of your SAP system.