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>This is happening if multiple thread(20-50) accessing db parallelly for 30-40 min.  

the supported replication is based on one master and multiple slaves, where synchronization updates

multiple PersistenceManagerFactory instances and some of them are not closed

We've got this exception, when running DB Doctor in parallel on multiple DB files. com.objectdb.o.UserException: Attempt to open a non existing file './tmp.E3Mwf13d7o/objectdb_7666012114926572695/DoctorSection_0.fls' at com.objectdb.o.MSG.a(MSG

my schema the child id must be composed from the parent Id and the child subkey. And I have multiple

at runtime? We would really love that, because we are using multiple separate ObjectDB Servers. Any

">EntityManagerFactory instance, use it for creating multiple EntityManager instances

I am encountering problems (complexities) with EntityManager registration of entities across multiple modules in a multi-module Maven project. I have a  entities under many different paths in many different modules, and frequently evolving/changing. JPA2 persistence.xml

may have to enhance different parts of their projects in several enhancement runs). If multiple

> Improving ObjectDB so it will be able to handle multiple versions of the same class concurrently