After a LOCK TABLE ... IN EXCLUSIVE MODE takes effect in GBase 8s, other users cannot acquire locks on that table. However, pending DDL operations may still encounter RSAM error -106 if concurrent sessions are accessing the same table through open cursors or Dirty Reads. Why This Happens An exclusive lock prevents new locks, but it does not evict existing Dirty Read operations or writes that are waiting for the lock to be released. Depending on the transaction isolation level, other users can hit lock timeouts or deadlocks, causing their transactions to fail. Solution: The LAST COMMITTED Feature Reading the most recently committed version of a locked row reduces lock conflicts dramatically. You can enable this in several ways: Per‑Transaction SQL : SET ISOLATION TO COMMITTED READ LAST COMMITTED ; Global Parameter : Set the USELASTCOMMITTED configuration parameter to 'ALL' or 'COMMITTED READ' .…