H. Features Introduced in Ingres 2.6 : Locking System Performance Improvements : Miscellaneous Locking System Improvements
 
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Miscellaneous Locking System Improvements
The following miscellaneous locking system improvements are included in Ingres 2.6:
The number of RSB waiters and converters are now maintained in the RSB.
The deadlock wait-for graph lock (lkd_dlock_lock) does not need to be held if the RSB has neither waiters nor converters.
The LKREQ built in the stack does not need to be copied to the LKB indiscriminately.
When a lock request is blocked, the blocker’s identity is now saved in the LKREQ and formatted in SYS_ERR only when the request fails.