How To Fix SCRR_IOC163 - Lock mode changed from "&1" to "&2" for table &3 due to XCLA &4

SAP Error Message - Details

• Message type: E = Error

• Message class: SCRR_IOC -

• Message number: 163

• Message text: Lock mode changed from "&1" to "&2" for table &3 due to XCLA &4

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message SCRR_IOC163 - Lock mode changed from "&1" to "&2" for table &3 due to XCLA &4 ?

  The SAP error message SCRR_IOC163 indicates that the lock mode for a specific table has changed due to an XCLA (exclusive lock) condition. This typically occurs in the context of database operations where a lock is required to ensure data integrity during concurrent access.
  Cause:
  
  Lock Mode Change: The error message indicates that the lock mode for a table has changed from one state (e.g., shared lock) to another (e.g., exclusive lock). This can happen when a transaction attempts to acquire a lock that is incompatible with the current lock mode.
  Concurrency Issues: This situation often arises in environments with high concurrency, where multiple transactions are trying to access the same table simultaneously.
  Transaction Management: If a transaction is trying to escalate its lock from a lower level (like shared) to a higher level (like exclusive) while another transaction holds a conflicting lock, this error can occur.
  
  Solution:
  
  Analyze Lock Situations: Use transaction codes like SM12 (to view locks) and SM21 (to check system logs) to identify which transactions are holding locks on the table in question.
  Adjust Locking Strategy: If possible, modify the application logic to reduce lock contention. This could involve:
  
  Reducing the duration of transactions.
  Using more granular locking mechanisms.
  Implementing retry logic for transactions that encounter lock conflicts.
  
  
  Database Configuration: Review the database configuration and settings related to locking and isolation levels. Adjusting these settings may help alleviate lock contention.
  Performance Tuning: Optimize the performance of the transactions that are causing the locks. This may involve indexing, query optimization, or other database tuning techniques.
  Consult Documentation: Refer to SAP Notes and documentation for specific guidance related to the error message SCRR_IOC163, as there may be updates or patches available that address this issue.
  
  Related Information:
  
  Transaction Codes: Familiarize yourself with relevant transaction codes such as SM12 (to check locks), SM21 (system log), and ST22 (dump analysis) for troubleshooting.
  SAP Notes: Search the SAP Support Portal for notes related to SCRR_IOC163 for any specific patches or recommendations.
  Lock Management: Understanding how SAP handles locks and the different types of locks (shared, exclusive) can help in diagnosing and resolving these issues.
  
  If the problem persists after trying the above solutions, it may be beneficial to engage with SAP support for further assistance.