[hibernate-dev] PESSIMISTIC_FORCE_INCREMENT lock mode
galovicsarnold at gmail.com
Thu Jul 27 09:46:50 EDT 2017
I'm a bit confused with the mentioned lock mode.
*The doc says the following:*
*"The entity is locked pessimistically and its version is incremented
automatically even if the entity has not changed."*
I'm checking this with an H2 DB and the current behavior is the following:
- the version attribute is incremented in advance, right after fetching
(I'm using EntityManager#find here, but with lock, it should be the same)
- the original fetching query contains the SELECT ... FOR UPDATE clause
Knowing this, it seems for me that this lock mode involves a DB lock,
however the doc doesn't say anything about this, especially whether it's a
shared or exclusive lock.
I've checked Vlad's article about this.
It says the following: "*The PESSIMISTIC_FORCE_INCREMENT naming might lead
you into thinking that you are using a pessimistic locking strategy, while
in reality this Lock Mode is just an optimistic locking variation."*
So now I'm unsure what this really is.
Could you please briefly describe it to me if I missed something?
Thanks in advance!
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