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forum_thread

Performance question

Hello, suppose you have an entity that holds a reference to another entity which in turn contains e.g. a date field you want to query for. Is there an improvement in performance if I create a "mirror" date field in the original entity, removing the need to traverse through the referenced other entity? So, querying for "all objects with object.otherobject.date > 1.1.1980" is slower than "all objects with object.date > 1.1.1980"? Or doesn't this matter, using proper indexing? Thanks, Benjamin #1 2011-10-20 19:01 Hello, suppose you have an entity that holds a reference to another entity which in turn contains e.g. a ...

 
issue

[Explorer] Executing Queries

The new Explorer of ObjectDB 2 supports retrieval of database objects by classes and navigation. Retrieval of database objects by executing queries should also be supported. This is one of the features that have been supported by the old Explorer of ObjectDB 1.It has been temporarily removed due to incompatibility with the new ObjectDB 2 code base. Feature Request Version: Priority: High Status: Fixed Replies: 1 Type:  Feature Request ...

 
forum_thread

Missing atificat for ObjectDB?

Hello! I am testing the Spring MVC and JPA tutorial, and always got an error in the POM file: <dependency>             <groupId>com.objectdb</groupId>             <artifactId>objectdb</artifactId>             <version>2.0.4</version>         </dependency>   ... says missing aritificat com.objectdb.objectdb.jar. After I remove this section, the POM file is ok. I am running Eclipse EE and ...

 
forum_thread

ObjectDB version 2.3 has been released

ObjectDB 2.3 has been released and it includes important additions and fixes: #1 2011-09-21 13:36 ObjectDB 2.3 has been released and it includes important additions and fixes: Added the abilit ...

 
api-jpa

orderBy(o)

Specify the ordering expressions that are used to order the query results.(Method of javax.persistence.criteria.CriteriaQuery)

 
api-jpa

groupBy(grouping)

Specify the expressions that are used to form groups over the subquery results.(Method of javax.persistence.criteria.Subquery)

 
forum_thread

null pointer exception in objectdb-2.4.4_06

I have the following stack trace.  Is this a null ptr in our code or in the object db code? #1 2012-12-07 14:02 I have the following stack trace.  Is this a null ptr in our code or in the object db code? Failed to ...

 
issue

NullPointerException in ENH.g(ENH.java:401)

Hello, corresponding to your suggestion I created a private ticket in reply to http://www.objectdb.com/database/forum/1109. Attached you will find my database file (I removed most of the content but one corrupt instance is still included). Bug Version: Priority: Normal Status: Closed Replies: 2 Type:  Bug ...

 
forum_thread

Exception while accessing the Persistence unit ...?

Hi, I am new to ObjectDB I was trying your eclipse/jee6/glassfish tutorial. I am getting the following exception: ... was add the unit name to the DAO class: (if I remove it then the exception thrown is the same with null for the Unit Name) ...

 
forum_thread

Heap Limit reached although the option 'objectdb.temp.page-file' is activated

We persisted many entities in a transaction, unfortunately the heap reached its limit at any time although the flush and the GC were invoked regularly. The attachments show the memory heap dump of the biggest consumer. Which objects you would actually expect to remove by the garbage collector? Why the option objectdb.temp.page-file does not perform?   Options: <temp path="$temp" threshold="512mb" /> ... Which objects you would actually expect to remove by the garbage collector? Why the option objectdb.temp.page-file ...