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8

Benchmark native JPA of Versant database (without datanucleous)

Now Versant DB (db4o commercial) has JPA implementation    Can you benchmark this Object Oriented DB to compare with Object DB? Since the Versant Object Database (unlike db4o) is not open source it would be impossible to include it in the JPAB benchmark results without the consent of Versant
Forum
8

database optimization

Hi, couple of questions regarding database optimization: 1) Noticed something odd with the level 2 ... , on the same set of objects.       Memory management in Java is a complex topic and in some cases smaller cache might be slightly more efficient because keeping objects in memory for longer time has some
Forum
8

World database - Changing country ID

of an existing entity object is not allowed and the Explorer should be fixed to prevent it. If you have to change the primary key you should create a new entity object with the new primary key and delete the old entity object (and of course, update relevant references). Regarding the primary key in
Forum
8

internal object DB locking in an embedded multi threaded application

to how we can improve / elviate this? our database files are between 100 and 500 meg when this occurs. It doesnt ... to drive a persistent queue.   Dan   The second stack trace (thread t@16) indicates database file ... database size). If no conf file is found or provided then what are the default values? The default
Forum
8

Database is locked when in use

the odb files in the file system but the same i was able to do it in object db 1.0. We supprt export ... for us :-( Do you have any settings or other way to handle this? Using copy & paste to clone a database when it is in ... to cast PersistenceManager to EntityManager. In ObjectDB the same object is an instance
Forum
8

calling persist on an object more than once

a better help message (ie: 'you called persist more than once on object xxxx'), and b) to throw ... , since usually persist does access the database, so checking for existing entity in the database is only performed on commit or flush. dmoshal
Issue
8

Error reading UTF string (Serialized Objects in Explorer)

.MitgliedVertraegeFragment')).contracts IS EMPTY)))   The attached database is empty. hmm weird.. ok ... objects in the Explorer but no exception is thrown - only the serialized fields display an error message ... fixes the Explorer only, right? If you have a problem in retrieval of this entity object also in
Forum
8

Does JPA have any configuration to create DDL's that are database specific

that are database specific.   Maybe what you are looking for is the Table annotation. But this is relevant only for ORM (Object Relational Mapping) JPA and ignored by ObjectDB. miteshpoo
Forum
8

Many clients access same database

Hi, I have a program to manage clients of my tennis club. But we have several different computer programs open that access the database. How can I implement this topology ... . You may have to refresh objects to get their up to date content. joelcraenhals
Forum
8

impossible to drop a table with 50 million objects

?     This may be because the transaction size is limited by the heap size. You can try deleting these objects in batches ... instances that returns part of the LogEntry instances in the database. Alternatively you may try using