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Another NPE on em.createQuery(query).getResultList()

classes (you should use enhanced classes anyway to improve performance). Verified and confirming that 2.2.8_01 fixes the issue. kaosko
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ArrayIndexOutOfBoundException

synchronized="true" due to performance reason. I am going to run the stress tests with recommended settings
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ArrayIndexOutOfBoundsException on flush

.java:722) ... 40 more The code at this point is performing a delete query for all entity objects
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Best practice for history tracking

We would like to add to records start and end timestamp fields. When end field is null, it indicates the last version of this item. Few questions: in terms of performance, what would be faster, having a single timestamp and looking for the top1 when ordered by time or the above solution, looking
Issue
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Bulk load of eager mapped by (inverse) relationships

When a collection of objects is retrieved by ObjectDB (e.g. by a query) ordinary referenced objects and collection of objects that have to be loaded eagerly are loaded in bulk for better performance. However, inverse (mapped by) references that have to be loaded eagerly currently do not participate
Forum
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Caching/Paging Questions...

and setMaxResults could improve performance, but the effect is highly dependent on the specific query. geekox86
Forum
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calling persist on an object more than once

, since usually persist does access the database, so checking for existing entity in the database is only performed on commit or flush. dmoshal
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Cascade delete with unidirectional mapping

you have to perform the operation explicitly in your code (maybe in a lifecycle event). vachagan
Forum
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Cascading merge() leading to "Attempt to persist a reference to a non managed instance" error

Dear Support Using Objectdb 2.3.4_02 I ran into an exception while performing some tests with a parent/child relationship and cascading merge() operations. The parent has an application defined id, while the child's id is generated, but I don't know if this is of concern. The following "test case
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collection of embedded objects

and improve performance. In many cases queries will run faster when using embedded objects, but not