About performance

forum_thread

How storage works?

I have one Class Car that contains a ArrayList of Wheels. I have already one Car with 4 Wheels attached stored in the DB. If I update my Car adding a new Wheel object is all the Car updated? Or only changed part is updated? By other words, If I have one complex data model and only one part is changed, the Object DB stored the all complex data model or only the changed part? Thanks ... collection is very large and updated frequently there is a performance advantage in defining it as inverse / mapped by. ...

 
forum_thread

Incremental online backup

Hello, Are there plans for ObjectDB to handle incremental online backups, where a backup does not create a whole new copy of the DB, but "updates" an existing backup? This behavior would make backups much faster as only a portion of the data would need to be copied. Such a feature would also allow to perform backups more often, several times a day, in order to always have a backup that's closer to the current state of the DB. Thank you #1 2016-04-07 10:19 Hello, Are there plans for ObjectDB to handle incremental online backups, where a backup does not create ...

 
forum_thread

ObjectDB vs DB4O comparison

ObjectDB and DB4O are the only two real object database I known. Why didn't you give a comparison between them in JPA Performance Benchmark (JPAB)?  TIA ... Why didn't you give a comparison between them in JPA Performance Benchmark (JPAB)?  TIA Institute ...

 
forum_thread

Update is ignored by ObjectDB

Hi! Sorry for my bad english skills. When I execute fulfilOrder, only Order entity is updated in the database, and User entity remains modified only in code, even if I go: user = smdb.find(User.class, user.id); In this source highlighted lines modifying entity, but not the database. #1 2014-01-25 20:53 Hi! Sorry for my bad english skills. When I execute fulfilOrder, only Order entity is updated in the database, an ...

 
forum_thread

Is persistence version 2.1 supported?

Using the current version of persistence.xml leads to an error: ... <!-- in-memory persistence unit for fast performance and minimal dependencies --> <persistence-unit ...

 
forum_thread

Strange behaviour with ORDER BY and IN

Hi, after trying out objectdb for a while now and being quite impressed by its speed and overall performance I noticed a strange behaviour where an ORDER BY - directive isn't executed as it should be (and usually is, except in this special combination-case). ... now and being quite impressed by its speed and overall performance I noticed a strange behaviour where an ORDER BY - directive ...

 
api-jpa

ValidationMode.AUTO

If a Bean Validation provider is present in the environment, the persistence provider must perform the automatic validation of entities.(Enum Constant of javax.persistence.ValidationMode)

 
forum_thread

Question about overriding default equals and hashcode

Hello Support, I have overrided equals and hashcode method in my entities beans. I don't know if you use these methods in your objectdb implementation. ( for comparing bean ? ) If yes, does it have an impact on performance of database ? Regards, Xirt   ... comparing bean ? ) If yes, does it have an impact on performance of database ? Regards, Xirt   ...

 
api-jpa

javax.persistence.spi.ClassTransformer

A persistence provider supplies an instance of this interface to the PersistenceUnitInfo.addTransformer method.(Interface of JPA)

 
issue

ODB-FileWriter holds unecessary entity reference after transaction and entity manager are closed

Hello, we've encountered a problem leading to memory leaks. We found that after closing a transaction (including the entity manager) the ODB file writer still holds a reference to entities. Performing similar calls repeatedly hence increases the number of references to entities not longer needed in the application context. This prevents the garbage collector from cleaning up the memory which eventually results in memory leaks. The attached screenshot shows an example of this behaviour. Thanks in advance for your help. Bug Version: 2.7.1 Priority: Critical Status: Closed Replies: 2 Type:  Bug ...