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ODB-WeakRefPurger threads not closing at all

Connection (using JDO and PersistenceManager) and not closing any of it. I've counted the DB connections during whole run of the application and it was +- the same as count of live WeakRefPurger

Items in list are doubled, when the entity class is not enhanced

); System.out.println("Item count = "+c.getItemList().size()); em.close(); emf.close(); } } The result is "Item count = 2". Is this another bug

Listing large number of complicated objects with paging.

.setFirstResult(start).setMaxResults(count).getResultList(); is quite slow. Well, after first request ... .hplxtool.dao.impl.ProductDAOImpl - Start: 250, count: 50 2011-11-15 19:31:03.219 [http-bio-8080-exec-3

Index on a low cardinality column

(e.g., a count query, as part of a composite index, etc.), so the recommendation is to try a simple ... . For example, an index on a gender field can be helpful in count queries that only return the numbers

Performance issues on aggregate query

we are using this aggregate query to collect some data: select p3.doubleValue,c1.classIdentifier,c1.objectName,sum(p4.doubleValue),sum(p4.doubleValue*p5.doubleValue),0,p7.doubleValue,p3.name,count(o) from ObjectNode o INNER JOIN o.properties p1 INNER JOIN o.properties p2 INNER JOIN o.properties p3

enumeration table? how to on pure jpa?

(); support Support Sometimes doing these by hand forces users some mistakes when configuration count

Removing entity class

, but there are still in ObjectDB database. The 2 tables for these entities are empty, but the tables exist, so they count

[ObjectDB 2.6.9] Unexpected exception (Error 990)

------------------- [1] Unexpected total object count: 189979358 (expected 189979356) BTree Value Errors ------------------ [1] cl.intelidata.jpaodb.Movil - Unexpected object count

Use temporary files to enable very large transactions

arrays which are referenced by ObjectDB classes. The count of byte arrays grows after flush and clear

ObjectDB 2.5.6

a NullPointerException in query compilation. Fixed a memory leak (Negative snapshot user count) in UPDATE queries

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Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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