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forum_thread

Best practice: Database update/migration of embedded databases in products

Hello Support, what experience do you have for data migration within a product? An example: There are three versions of a product (v1.0; v1.1, v2.0). In each version, the entities have been modified. Attributes added, removed and renamed. If attributes were removed, then only because the data is now held otherwise. ... - for adding and removing fields and for class hierarchy change. Configuration schema changes - for renaming packages, ... code in your application. In order to support this schema change you will have to maintain all the fields, (the old and the new) in the ...

 
forum_thread

Complex Schema Upgrade not working

Hello, We're trying to upgrade the DB-Schema. Simplied our source/original Schema/Class-Hierarchy looked like this: class contact.Contact class customer.Customer extends contact.Contact class member.Member extends customer.Customer We have database records within each class type (Contact, Customer and Member). ... - for adding and removing fields and for class hierarchy change. Configuration schema changes - for renaming packages, ...

 
forum_thread

Failover from Master to Slave

Good morning! I am interested in ObjectDB for a client project I am currently working on. In order to evaluate your tool I would like to know if your product has the ability to failover from a Master Database to a Slave Database and then recover back to the master when the master comes back online. I don't see any documentation about automatic failover.   Thanks Rich   ... For support: do you have an idea how change the urls when in a Java EE JTA environment without restarting the app? ... delayed a few seconds to let all live applications see the change, but a delay of a few seconds should be acceptable in most ...

 
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Run out of memory

Hi, I've been looking into ObjectDB for our use, where everything has been great apart from I'm stuck on the following problem.   I am trying to load a large file (> 1GB), process certain information and store it back in the database to access / modify later. I require to be able to rollback changes as well, where there can be massive amount of changes.   #1 2011-06-21 01:43 Hi, I've been looking into ObjectDB for our use, where everything has been great apart from I'm stuck on ...

 
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Optimization Question

One of our uses for your ObjectDB software is in maintaining the current state of a large number of data objects called tracks. These tracks change very frequently over time (every 10-15 seconds is not unreasonable), but they are also very large complex data structures so it's extremely difficult to identify exactly what fields have changed from one update to the next. Currently the following sequence executes when a track update comes in: - If it’s a new track simply add it to the database.... a large number of data objects called tracks. These tracks change very frequently over time (every 10-15 seconds is not unreasonable), but ...

 
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UserException: Invalid configuration in 'internal' - Check permissions

Hi all,   I have a master/slave code so that each slave reads a subset of points of the same database. ObjectDB entities do not allow serialization and so I have sent, to each slave, the file path. With such information I have tried to create an entityManager, in each slave, as follows: EntityManagerFatory entityManagerFactory = Persistence.createEntityManagerFactory(filePath); EntityManager = entityManagerFactory.createEntityManager(); However I get the following error ... < /span > :   Is there any way to change such permissions. I have search unsuccesfuly. The full error is given as ... on the log directory and ObjectDB Home , and either change permissions for the default log path, or change ObjectDB home, or change ...

 
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Can't post on your forum

Since yesterday, I can't post on the forum because it always says that I should log in in order to do that. I was already logged in, but, anyway, it appeared as not. I go to log in, then I authenticate, then I'm redirected to the home page, but it still looks that I'm not logged in, so I can't post on the forum. I tried removing the cookies, but nothing. I tried in another browser, but the same. I have new bugs to post, so it's pretty important. ... to let other users know about this problem). We had to change your password so please set your password again. We received a ... settings. This is weird because we didn't change anything in that code, just moved the website to another host.  ...

 
api-jdo

javax.jdo.InstanceCallbacks

A PersistenceCapable class that provides callback methods for life cycle events implements this interface.(Interface of JDO)

 
api-jdo

javax.jdo.spi.StateManager

This interface is the point of contact between managed instances of PersistenceCapable classes and the JDO implementation.(Interface of JDO)

 
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: ... DATA IS UP TO DATE](how? why?) 3) made 1 change to master ODB 4) opened master DB with explorer (User table see ...