About access

forum_thread

locks on pure query activities

analyzing the dynamic behavior we can see from the thread dump that a lot of our threads that are just doing simple queries show locks like these (question is: why there are locks and how could we get rid of that):   log1:   ... 2017-05-01 20:38 Access to the underlying database file is synchronized with that lock. ... > <dir path = "/" permissions = "access,modify,create,delete" /> </user > <user ...

 
release

2.3.7

Release date: 2012-02-06 Download (5.38 MB) Binary:  objectdb-2.3.7.zip You should start by following a  tutorial or reading the manual ...

 
api-jdo

javax.jdo.JDOCanRetryException

This is the base class for exceptions that can be retried.(Exception of JDO)

 
api-jdo

javax.jdo.JDODataStoreException

This class represents data store exceptions that can be retried.(Exception of JDO)

 
api-jdo

javax.jdo.JDOFatalUserException

This class represents user errors that cannot be retried.(Exception of JDO)

 
forum_thread

Pessimistic Lock Timeouts setting

Hi,   I realise that JPA2 doesn't necessarily define a standard API way for Lock Timeouts. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" ... pessimistic lock is in place on the record, a subsequent access (which is a valid scenario for me) would instantly throw a: ...

 
forum_thread

Sync ObjectDB and MySQL

Is there a listener or program that can be used to sync across data from/to MySQL and ObjectDB so that I can use ObjectDB for development and then just make sure MySQL always has the same data so that we can say "we use MySQL as one of our products"? ... may try wrapping operations against ObjectDB in a database access layer code that will execute these database operations on both ObjectDB ...

 
forum_thread

ObjectDB and Hibernate in one JVM?

Hi all, I need to persist my application data and also access a legacy RDBMS system in the same Java application. Currently I use Hibernate for both purposes. I've heard ObjectDB is much faster than Hibernate, so I want to try the it to deal with my application data, but I still need some ORM system to access RDBMS. ... I need to persist my application data and also access a legacy RDBMS system in the same Java application. Currently I use ... my application data, but I still need some ORM system to access RDBMS. Is it possible to use both ObjectDB and Hibernate in the ...

 
forum_thread

Convert embedded database to server

Hello, What is the right way to convert an embedded database to a server one ? As a result, will a file "db.odb" exist ?  If no, where will be located db files ? Regards, Xirt   ... to the server data directory , start the server, and access the database from your application using a client-server connection ...

 
api-jdo

jdoPreDelete()

Called before the instance is deleted.(Method of javax.jdo.listener.DeleteCallback)