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Status Not under consideration
Workspace Db2 for z/OS
Created by Guest
Created on Aug 22, 2018

RELATED IDEAS

Inconsistent locking behaviour between DB2 data sharing and non data sharing environemnt

In below use case, the result is not consistent between data sharing and non data sharing or task B running on same member or different member in data sharing.
Client application team is asking for consistent locking behaviour between DB2 data sharing and non data sharing. They expect DB2 data sharing is transparent for application developer on application lock behaviour.

Use case:
lock request for same row
1) Task A on Member1 acquire U lock first
2) Task B on Member2 request X lock, which wait
3) Task C on Member1 reuqest S lock
4) Task A change request to X lock

Deadlock will happen in this case. But if Task B run on same member member1, it will finish sucessfully.
  • Admin
    Janet Figone
    Reply
    |     Dec 17, 2020

    It is true that there is a difference in behavior in this scenario because the request to upgrade from U to X is allowed to go ahead of X waiters if the X waiter is local to the U lock. That optimisation is not possible if the waiter is on another member of the group. Removing this optimisation would have a serious negative impact on applications and there are no plans to do so. One option which could be considered would be to use the USE AND KEEP EXCLUSIVE LOCKS clause which would cause Db2 to acquire an X lock straight away and thereby avoid the need to upgrade later, but of course this option is not without negative repercussions either.

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