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Querys without Transaction

Hello, are querys faster, if we use the entity manager without transaction, since we need only read-only entities. btc_es BTC EmbeddedSystems There is no much difference, but report queries, i.e. queries that return simple value fields rather than entity objects are more efficient as they eliminate

Failed to commit transaction: Java heap space (error 613)

.RollbackException Failed to commit transaction: Java heap space (error 613) We are using ObjectDB 2.4.6_10

Query problem after transaction commit

I have a machine running the objectdb server and the client on another machine connect to it. The client program can connect to the server and query to get all the records. However, after transaction.begin ... persist(p) .. commit of a new object, my client program can no longer retrieve the old

Max transaction size

What’s the max transaction size, or how is it determined? Trianglehead Json Error The main limit is the available memory in the JVM. There is no hard limit. support Support

CM Transaction Implementation

Hi All, How to implement Container Managed Transaction using Glassfish / Weblogic server. Please provide us the step by step instruction, how ti achieve it umesh umesh Please check the following tutorial: http://www.objectdb.com/tutorial/jpa/ee support Support

Obtaining a JPA Database Connection

, update, and delete should only be performed within an active transaction. Given an EntityManager, em, it is very easy to begin a transaction: em.getTransaction().begin ... that the getTransaction method returns. When a transaction is active you can invoke EntityManager methods

Deleting JPA Entity Objects

transaction, it can be deleted using the remove method: Employee employee = em.find(Employee.class, 1 ... (); The entity object is physically deleted from the database when the transaction is committed. Embedded objects that are contained in the entity object are also deleted. If the transaction is rolled

ObjectDB Object Database Features

full transaction recording and replaying. Automatic diagnosis and repair of corrupted database files ... ObjectDB can be very effective in heavy loaded multi-user systems. Transactions JPA/JDO ACID transactions. Operations: begin, commit, rollback. Processes and Threads All API classes and interfaces

Database Explorer

the Edit > Move Element commands. Saving Changes The Explorer manages an active transaction for every open database file. All the editing operations are associated with the active transaction. The File > Save menu command commits the transaction (applying all the changes to the database). The File

[ODB1] Chapter 4 - JDO Metadata

="transactional" /> <field name="f3" default-fetch-group="true" /> <field name="f4 ... in the class is always required. persistence-modifier (persistent | none | transactional) The default ... as transactional, like f2 above, has similar behavior to transient because its value

Getting Started

ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

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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