About redundancy

manual

Database Replication and Clustering

Replication enables maintaining up to date version of an ObjectDB database on multiple nodes. ObjectDB supports master-slave replication (cluster). When replication (or clustering) is used, the same database is managed on multiple machines (nodes), possibly in different geographic locations. This could help in achieving high availability, ...

 
manual

Online Backup

Online Backup enables backing up an ObjectDB database while it is in active use by applications. The ability to create a backup while the system is running is essential in applications and services that have to be available 24/7/365. An ObjectDB database can be backed up by simply copying or archiving the database file while the database is offline (i.e. when it is not open in an ObjectDB server and not in use by any application), since an ObjectDB database is stored as an o ...

 
forum_thread

EmbeddedId with Generated field value

@Entity public class A { @EmbeddedId private Id id; } @Embeddable public class Id { @Generated private long id; private String zone; } How can I get the field Id.id auto-incremented?   #1 2012-12-06 17:29 I know the following 2 ways to declare a composite Primary key: ********* Solution 1 ********* @ ...

 
api-jdo

Joins.value

The join definitions used for the mapping of this type.(Annotation Element of javax.jdo.annotations.Joins)

 
api-jdo

javax.jdo.annotations.Joins

Annotation for a group of joins.(Annotation of JDO)

 
forum_thread

ObjectDB Clustering VS Hadoop Hbase

The Hbase is an open source distributed database on Hadoop, it is robust regardless of the performance problem. The ObjectDB cluster may be a distributed database, I guess. But I dont know whether it has only one entry, or each node has an entry. Could you please explain the difference between Hbase and ObjectDB clustering? TIA   ... slaves defined, how to add or delete a slave to change the redundancy of the clustering without restarting. TIA ...

 
manual

Deleting JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database. Existing entity objects can be deleted from the database either explicitly by invoking the remove remove(entity) EntityManager's method Remove the entity instance. See JavaDoc Reference Page... method or implicitly ...

 
manual

[ODB1] Chapter 5 - JDO Connections

The PersistenShows how to use database connections and transactions in JDO. ceManagerFactory interface represents a factory of database connections. Its main role is to provide PersistenceManager instances. The PersistenceManager interface represents a database connection. Every operation on a database requires a PersistenceManager instance. The Transaction interface represents a transaction on a database. Every operation that modifies the content of the database requires an active transaction.[toc hidden:1] This chapter describes three essential interfaces for using JDO: 5.1  javax.jdo.PersistenceManagerFactory 5.2  javax.jdo.PersistenceManager 5.3  javax.jdo.Transaction The PersistenceManagerFactory ...