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Query and commit simultaneously

the database at the same time using multiple threads. However, if all the threads share the same ... ) and you have to use multiple EntityManager/PersistenceManager instances, usually one per thread

Optimistic lock failed

your accessing that object in the database from multiple methods simultaneously or you've got some super ... then you can try waiting before trying the transaction again or trying multiple times. jgleoj23 Joseph Gardi

Searching lists within objects

: Avoid multiple Attribute instances with identical type / value by defining a composite unique ... such comparison, so it might be still more efficient to use multiple JOINs in this case. support Support Okay

em.flush(); em.clear(); loosing data and not persisting managed objects

that I'm using in these entity has multiple fields that are related but takes too long to access ... with String Primary Keys, I'm going to try the other multi ID method of @IdClass and multiple @Id

High memory consumption even after close() of EntityManagerFactory

Hello, we still have memory usage problems. When debugging, we have now observed a case in which the execution of multiple queries increasingly byte array were generated (about 1.5 GB) which from GC could not be released. Not even after the EntityManagerFactory closed. We created a small test

Adding new unique columns

. This is indeed the only option, otherwise you will break the unique constraint with multiple objects with the same null value for the field. support Support

Is it possible to commit only specific elements?

to multiple threads. Another option is to detach specific objects from the persistence context

combined index not used

the next post). As you have several heavy queries with multiple JOIN operations with very slow execution

database corrupt

of problems as we start now with our worldwide multiplication. Please advice what we should change in

Collision Between Different Schema Versions of Entity Classes

Version 2.8.4 fixes a critical bug that in rare cases may cause collision between different schema versions of entity classes, when schemas have changes many times (usually more than 20 times). This bug mainly affects queries on hierarchy of multiple entity classes (i.e. a query on a super class

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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