About table

forum_thread

Performance problem

Hi, we have a strange performance problem with ObjectDB 2.5.3_01 and JBoss 7.1.1. We have two ObjectDB databases on one ObjectDB server. Production database is running 5-10 times slower than test database. Their size and number of records are almost identical. When running production database in separate test environment its speed is very good. We did a performance analysis on our 2 linux servers one running JBOSS and other running ObjectDB. - CPU utilization of JBOSS server is max 5-10% (per core)... this behaviour gives aprox 10-13 s of refreshing a data table vs 2 second with test database. Does anybody have any idea what ...

 
forum_thread

Foreign key constraint issue

Hi, I'm trying to create two tables (Parent and Child) with a foreign key constraint from Child to Parent so that when the parent is deleted all children are removed as well. Unfortunately, in one specific case that foreign key constraint doesn't apply and I can't figure out what I'm missing. The definitions of the classes are as follows: #1 2017-02-21 19:59 Hi, I'm trying to create two tables (Parent and Child) with a foreign key constraint from Child to Pa ...

 
issue

com.objectdb.o.InternalException

No idea what happened.  A simple getResultList() opearation. DB table affected size is ~ 26000 records, physical DB file size is ~ 8.5MB Thanks for any help ! Leon log file: ------------------------------------------------------------------------------------------------------------------------ [2016-07-13 19:58:12 #1 store] Database '/home/gsi/wdsync/db/Media_wdsync.odb' is opened by 12659@server ... happened.  A simple getResultList() opearation. DB table affected size is ~ 26000 records, physical DB file size is ~ 8.5MB ...

 
forum_thread

persitencia (Preguntas y respuestas)

1ra.pregunta:     tengo un formulario y cuando grabo mas de un registro, solo me grava el ultimo mas no los anteriores. 2da.Pregunta:    Tengo un indice que no es el ID y necesito que mi tabla muestre los datos de acuerdo al indice. Como                          puedo hacerlo?. Alguien me sugiere algo. Gracias   ... every request - more details are needed. To view a table order by a field use an ORDER BY query. Query execution will be faster in ...

 
api-jpa

Table.catalog

(Optional) The catalog of the table.(Annotation Element of javax.persistence.Table)

 
api-jdo

javax.jdo.spi.JDOPermission

The JDOPermission class is for operations that are reserved for JDO implementations and should not be called by other code.(Class of JDO)

 
forum_thread

A few questions on object database design

I've been trying to model a database that stores data in an MMORPG. With ObjectDB, a lot of things are easier to perform. Intuitively, I created an entity class called player and stored everything about the player as embeddable classes. However, my colleague questions about this structure, since we would be looking at persisting data from the server every minute or two per player. He has stability issues with the ObjectDB if we are accessing the same table all the time.... issues with the ObjectDB if we are accessing the same table all the time. I know that ObjectDB outperforms a lot of other conventional table-oriented databases, but I'm wondering whether my colleague has a ...

 
api-jpa

javax.persistence.OneToMany

Defines a many-valued association with one-to-many multiplicity.(Annotation of JPA)

 
api-jdo

javax.jdo.annotations.Embedded

Annotation to define that the object is embedded into the table of the owning object.(Annotation of JDO)

 
api-jdo

javax.jdo.annotations.Inheritance

Annotation for the inheritance of the class.(Annotation of JDO)