Access different databases from the same process

[Bios-Marcel]

Is it possible to access different databases from the same JVM without causing any data corruption or runtime issues in either instance?

While https://docs.eclipsestore.io/manual/storage/faq/file-storage.html#_may_multiple_jvm_processes_access_the_same_eclipsestore_database already answers the opposite question, this one seems unanswered. I guess if there's an another here, it'd be nice to add this to the FAQ :)

The reason why I am not just trying this, is because I am afraid that static components such as the LazyReferenceManager could be causing issues here. Maybe there are also other static aspects that I am not aware of?

As to why I want to do this: We have use eclipse serializer as a our export / import format. However, the problem is, that it is not stable. So we'd have to run our migration logic. However, we can't even get to the point where we can parse the data anymore, since the data structure has changed too much.

SO the idea would be to create a second instance, do a full backup, and reimport the full backup, on which we can than do a migration.

[hg-ms]

Hi,
Running two storages in one process is no problem.

The only pitfalls are lazy references. They are bound to one storage and can’t be serialized. But they can be unlinked if you need to store them to a different storage instance (load data behind the lazy before unlinking!).
It is also legal to have an object instance persisted with more than one active storage.
You can load it from Storage A and persist it to Storage B without the need to create a deep copy using the serializer.

[Bios-Marcel]

Thanks for the quick reply.

Yeah, we already ran into the issue of having to copy our lazies, so that should be fine :)