About Object Database

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Database(*.odb) file size on disk

Hello, we have questions about the file size of ObjectDB database on disk. Can you tell us something about how the deleting of entities affects the size of *.odb files on disk? -Will the released memory always used by new entities? -Will be the database file automatically reduced?   We have created a small test, in which we create and delete entities. It looks like that the released memory are reused but the the file not resized. The database is at the end empty again, but larger than the initial size. ... we have questions about the file size of ObjectDB database on disk. Can you tell us something about how the deleting of ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) ...

 
release

2.7.0

... 2.7.0 Extended maximum supported entity object size to nearly 2GB. Added a temporary system property to ... Version 2.6.4 Added memory only database mode. Added an option to cascade detachment to ...

 
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Shrinking Database Files

These are questions asked in the context of the proposed architecture described in the forum thread titled, "Sample JDO Architecture for Follow Up Questions".   I thought I read something on the ObjectDB website (forum? 1.x manual?), which I cannot find now, that stated that the datastore file never shrinks when large number of objects are deleted and the only way to reclaim that space would be with Database Doctor. Is there a way to reclaim database file space? ... and the only way to reclaim that space would be with Database Doctor. Is there a way to reclaim database file space? ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) ...

 
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Beginners questions

Hello !! I am new in JPA / ObjectDB development and I have many questions: 1. If I understood correctly, ObjectDB is an implementation of JPA standard (currently 2.0)? 1.1. Is ObjectDB on the same level like Hibernate with only difference that Hibernate stores the data in a RDBMS and ObjectDB has its own format?   ... in a RDBMS and ObjectDB has its own format? 2. Object creation I created a class named EBResult which looks like ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
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GWT RPC is throwing serialization exception when I have object db date value

Caused by: com.google.gwt.user.client.rpc.SerializationException: Type 'objectdb.java.util.Date' was not included in the set of types which can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be serialized.: instance = Sat Jan 29 00:00:00 PST 2011    at com.google.gwt.user.server.rpc.impl.ServerSerializationStreamWriter.serialize(ServerSerializationStreamWriter.java:614)  ... can be serialized by this SerializationPolicy or its Class object could not be loaded. For security purposes, this type will not be ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) edit ...

 
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Performance with large databases

When populating a large database (10s of GBs) performance drops suddenly at a certain time whenever I run the populating application.  Is there typically a database size when indexes can no longer be held fully in memory or some such issue?  The method calls that suddenly start to take the most time are those that retrieve data from the store. ... When populating a large database (10s of GBs) performance drops suddenly at a certain time whenever I ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) ...

 
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Entity listener - event instead of object

Hi, Currently I'm playing with entity listener to implement auditing with difference between values in updated entity. There is a problem however with accessing "old" version of object stored in database. I can't find the nice way to use EntityManager in EntityListener. Because of that, I can't store separate entity for given event. Right now I'm using BaseEntity which contains ... There is a problem however with accessing "old" version of object stored in database. I can't find the nice way to use EntityManager in EntityListener. ...

 
manual

SELECT clause (JPQL / Criteria API)

Explains how to use the SELECT clause and projections in a JPA/JPQL query.... objects, including transparent navigation to other database objects, transparent update detection , support for delete , ... the following query returns a managed City entity object: SELECT c . capital FROM Country AS c WHERE c ...

 
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Open several objectdb databases the same time

We tried to open objectdb databases from application and got following error: ... and got following error: Attempt to open a database file ... 4 more Is it possible to open object db files in read only mode from several application instances? ... ObjectDB Support ObjectDB - Fast Object Database for Java (JPA/JDO) ...

 
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Delete object from collection versus delete from JPQL

I'm a newbie, so this is a pretty fundamental question. I'm not sure if there is a bi-directional relationship between the objects in memory and ObjectDB.  I know I can modify the objects and use persist() to write them to the database.  But does running a JPQL update or delete alter the in-memory objects? There are cases where the JPQL syntax is more expressive than operating on a collection, but I'm not sure if that will alter my program state.  Will it? Thanks, Lee  ... modify the objects and use persist() to write them to the database.  But does running a JPQL update or delete alter the in-memory ... and DELETE queries bypass the EntityManager entity object management, and accordingly break the synchronization between memory and ...