About page

forum_thread

Replicated cluster recovery

If I create a replicated database cluster as per http://www.objectdb.com/java/jpa/tool/replication what is the behaviour of the master database after a failure? For example, say I have MasterDB and SlaveDB in the cluster. If MasterDB goes offline the application will automatically switch to SlaveDB. When MasterDB comes back online it will have missed any activity that occured during the downtime. ... to read only (it is indicated at the beginning of the page but probably has to be emphasised). Your idea of switching the ...

 
forum_thread

Object DB vs EclipseLink/TopLink: Unloaded relationships in detached entities

This topic is for those considering migrating from EclipseLink JPA or TopLink to ObjectDB JPA. #1 2011-06-03 20:30 This topic is for those considering migrating from EclipseLink JPA or TopLink to ObjectDB JPA. This conce ...

 
release

2.5.4

... in queries. Fixed a critical bug in page caching (issues #116 , #119 , #121 ). Fixed a bug ... user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( issue #85 ). Fixed handling ;drop ...

 
issue

JPQL Case Statements (JPA 2.0)

JPQL 2.0 adds support of CASE statements in queries for conditional expressions (similar switch/case/default in Java), following the SQL syntax. Case statements are currently not supported by ObjectDB.... expose a named link (with id parameter) to the full view page of a fully loaded Element entity, and similarly links to the project or ...

 
forum_thread

Understanding limitations of schema evolution

Hi, I am trying to understand the limitations of schema evolution and have read the material on http://www.objectdb.com/java/jpa/entity/schema as well as the link therein regarding manual schema update when changing a field’s name Yet, i am confused regarding how to handle the case where one re-factors a class by moving one if it's Fields to a different class. Is this case managable? Thanks... of defferent objects)? Going over the schema update page http://www.objectdb.com/java/jpa/setting/schema it is not clear how to ...

 
release

2.5.3

... in queries. Fixed a critical bug in page caching (issues #116 , #119 , #121 ). Fixed a bug ... user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( issue #85 ). Fixed handling ;drop ...

 
forum_thread

Replication error on slave restart

I'm trying to enable replication on master server that was running with "recovery" enabled previously. I have copied database file to slave... and so on by manual. It worked fine. But if I restart slave server: ... initial = "256kb" resize = "256kb" page = "2kb" /> <recovery enabled = "false" sync = ... initial = "256kb" resize = "256kb" page = "2kb" /> <recovery enabled = "true" sync = ...

 
release

2.5.2

... in queries. Fixed a critical bug in page caching (issues #116 , #119 , #121 ). Fixed a bug ... user count" bug ( issue #83 ). Fixed a page cache purge deadlock ( issue #85 ). Fixed handling ;drop ...

 
forum_thread

TemporalType injection with Calendar using JPA

I have ObjectDB  JPA  comsummed by a RESTful web service deployed on Tomcat. I am using an embedded object as a primary key, which has time fields which I have annotated with TemporalType.TIMESTAMP When I use a java.util.Date as a field on this object there is no problem. However, if I use a java.util.Calendar it encounters an exception.   Calendar is what I need.  Is there something obvious here that I am failing to see?   ... that this could be confusing. However, that page starts with the following definition:     The ... keys are more restrictive, as explained on the primary key page. Probably Calendar may be supported in the future - but as ...

 
api-jdo

javax.jdo.identity.LongIdentity

This class is for identity with a single long field.(Class of JDO)