How To Fix DI823 - Maximum number & of tables to be locked exceeded

SAP Error Message - Details

• Message type: E = Error

• Message class: DI - Dictionary messages: Indexes

• Message number: 823

• Message text: Maximum number & of tables to be locked exceeded

What causes this issue?

The lock object to be activated should lock a total of &V2& Basis
tables. This exceeds the maximum number of &V1& Basis tables to be
locked. This means that the generated lock modules could be
syntactically incorrect.

System Response

The system issues an error message and will not allow you to continue with this transaction until the error is resolved.

How to fix this error?

After activation, check whether the generated lock modules are
syntactically correct. If this is not the case, immediately delete the
lock object, as otherwise application errors could occur. Then proceed
as follows:
Check if it is really necessary to lock so many tables. Try to reduce
the number of Basis tables in the lock object or delete
<DS:TX.DDDOK_ENQU_MODE>lock mode</> in the definition of the lock
object for some of the Basis tables.
If you cannot sufficiently reduce the number of tables to be locked
with these actions, you must distribute the tables to be locked onto
several lock objects. In this case you must call a sufficient number of
lock modules for the <DS:TX.DDDOK_ENQU_CALL>lock request</>. You can
also <DS:TX.DDDOK_ENQU_COLLECT>collect locks in a local lock
container</>.

Error message extract from SAP system. Copyright SAP SE.

Smart SAP Assistant

• What is the cause and solution for SAP error message DI823 - Maximum number & of tables to be locked exceeded ?

  The SAP error message DI823, which states "Maximum number & of tables to be locked exceeded," typically occurs when a transaction or operation attempts to lock more database tables than the system's configured limit allows. This can happen during complex transactions that involve multiple tables or when a long-running transaction holds locks on many tables.
  Cause:
  
  Excessive Table Locks: The operation is trying to lock more tables than the maximum allowed by the system configuration.
  Long-Running Transactions: If a transaction takes a long time to complete, it may accumulate locks on multiple tables.
  Inefficient Code: Custom code or poorly designed processes may lead to unnecessary locking of tables.
  High Concurrency: Multiple users or processes trying to access and lock the same tables simultaneously can lead to this error.
  
  Solution:
  
  Review and Optimize Code: Check the custom code or transaction logic to ensure that it is not unnecessarily locking tables. Optimize the code to minimize the number of locks.
  Break Down Transactions: If possible, break down large transactions into smaller ones that lock fewer tables at a time.
  Increase Lock Limit: If the business process genuinely requires locking more tables, consider increasing the maximum number of locks allowed in the system. This can be done by adjusting the parameter enque/table_lock_max in the SAP system profile. However, this should be done with caution and in consultation with your SAP Basis team.
  Monitor and Analyze Locks: Use transaction codes like SM12 (to view and manage locks) and SM21 (to check system logs) to monitor locks and identify any long-running transactions that may be causing the issue.
  Database Performance Tuning: Ensure that the database is properly tuned to handle the load and that there are no performance bottlenecks.
  
  Related Information:
  
  SAP Notes: Check SAP Notes related to this error for any specific patches or updates that may address the issue.
  SAP Documentation: Review SAP documentation for best practices on transaction design and locking mechanisms.
  Transaction Codes: Familiarize yourself with transaction codes like SM12 (lock entries), SM21 (system log), and ST22 (dump analysis) for troubleshooting.
  Consult SAP Support: If the issue persists, consider reaching out to SAP Support for further assistance.
  
  By addressing the underlying causes and optimizing the locking strategy, you can resolve the DI823 error and improve the overall performance of your SAP system.