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[ODB1] Chapter 8 - ObjectDB Server

An ObjectDB server can manage one or more databases. Databases that are managed by a server can be accessed by multiple processes simultaneously. In addition, the server supports accessing these databases from remote machines by TCP/IP. More details about client server mode vs. embedded database mode are discussed in Section 1.2.... > Three attributes are changed. The empty address attribute eliminates the inherited address restriction. The ...

 
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Duplicate Entity class names causes Exception in Query

I have two Entities which have the same class name but reside in different packages, only one of them is mentioned in the persistence.xml. I a NamedQuery I use the unqualified class name of one of these entities. If I execute that query I get an exception;   ... probably not be necessary. If the database is empty and the type is not specified in the persistence unit - then the type is ...

 
forum_thread

Database size is much larger than expected (x2)

I store images into objectdb. The schema is : <URI>::=(<sUrl>, <cMark>, <iSize>, <baBody>, <id>) <sUrl>::=String <cMark>::=char <iSize>::=int <baBody>::=byte[] <id>::=@ID So simple a class will fail after 155,648 insertions with -Xmx1432m, ... that it doesn't matter for ObjectDB if you store an empty new byte[1000000] or a byte[]  in that same size with data ...

 
forum_thread

Occasionally slow requests in load testing

We are running load testing against objectdb version 2.3.7_18. The performance is generally OK, however there are quite a few "spikes" in the performance where we are getting a lot of very slow response times from the DB, around 10 - 15 seconds. Looking at the DB server process with AppDynamics we can see that most of the requests get stuck in one of 2 places: com.objectdb.o.PGC:w: line number 232 com.objectdb.o.LFL:U: line number 1068 Please see the attached callgraph examples for full stack trace examples. #1 2012-04-26 12:56 We are running load testing against objectdb version 2.3.7_18. The performance is generally OK, however there are ...

 
page

ObjectDB Object Database Features

ObjectDB provides a rich set of features, many of them as the result of supporting the JPA and JDO APIs.... JPQL collection operators & functions (IS EMPTY, MEMBER OF, SIZE). Java standard ...

 
manual

[ODB1] Chapter 3 - Persistent Classes

Explains what a persistence capable class is and which types are supported by JDO.... the four methods, keeping the methods that are irrelevant empty. For example: package test ; import javax. jdo . *; ...

 
forum_thread

Should I be able to persist a JFrame (or gui components in general)?

    I did the following: 1. (using Netbeans 8.02 & last available java 7 sdk) I sort of follow your tutorial(s) while applying the ideas to a sample that came with the IDE called GUIFormExamples (under samples). ... from ContactEditor ce" it returns empty strings, but there should have been text at the time this ran: ...

 
issue

Use temporary files to enable very large transactions

We have transactions in which many objects are created. These objects are no longer needed in the current transaction after creation. Unfortunately, we will receive an OutOfMemory exception because the objects are kept in the first level cache of ObjectDB. In the forum thread http://www.objectdb.com/database/forum/921 on post #4 you wrote, that ObjectDB should support very large transactions in further version. Can you implement it that ObjectDB used temporary files? ... Do you invoke em.clear after flush to empty the persistence context? Do you use embedded mode or ...

 
forum_thread

Glassfish 4 AbstractMethodError: com.objectdb.jpa.EMF.createEntityManager

Hi! I've been trying to get Glassfish 4 (Java EE 7) work with ObjectDB the whole day. It seems to be an error. The same code (adapted to Java EE 6) works perfect in Glassfish 3.1.2.2. I attached the samples as NetBeans projects, so that you could check easier. 1 for GF3 (6) and 1 for GF4 (7). Thanks! ... A new build, 2.5.3_02, adds empty implementation of the new JPA 2.1 methods. We haven't tested ...

 
forum_thread

500Mb ObjectDb database opening issue

Hi, I have observed that 500 Mb objectDb database opening time is very slow (~3 seconds) for following code m_EntityMgrFactory = Persistence.createEntityManagerFactory( "objectdb:" + aFilename ); m_EntityManager = m_EntityMgrFactory.createEntityManager(); Does exist any way to speed-up open time for big databases? Definitely, it's too long for 500 Mb database! ... show different results. Please try also opening an empty database in a console application with no activation codes. ...