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About Object Database

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FAQ
40

Is ObjectDB scalable? What are its limitation?

. Up to 9,223,372,036,854,775,808 entity objects per database file. Unlimited database connections (limited by operating system resources). ... ObjectDB is highly scalable and can manage efficiently databases in a wide range of sizes, from ... supports: Database file size up to 128 TB (= 131,072 GB = 134,217,728 MB). Up to 2,147,483,648 entity
Manual
31

General Settings and Logging

data, such as query results that contain millions of objects. The element specifies temporary ... database urls for use by the Explorer. The size attribute specifies the maximum size of this list ... recently used databases in the Explorer easier. The element
Tutorial
31

Eclipse/JPA Spring MVC Web Tutorial

is represented by a Guest JPA entity object and all the Guest entity objects are stored in an ObjectDB database. Required Software For this tutorial you will need the following software: Java JDK 6.0 (or
Tutorial
31

NetBeans/JPA Spring MVC Web Tutorial

is represented by a Guest JPA entity object and all the Guest entity objects are stored in an ObjectDB database. Required Software For this tutorial you will need the following software: Java JDK 6.0 (or
Tutorial
31

Spring MVC and JPA Tutorial

that has signed the guestbook is represented by a Guest JPA entity object and all the Guest entity objects are stored in an ObjectDB database. This tutorial is available in the following versions: In
Manual
31

JPA Primary Key

Every entity object that is stored in the database has a primary key. Once assigned, the primary key cannot be modified. It represents the entity object as long as it exists in the database. As an object database, ObjectDB supports implicit object IDs, so an explicitly defined primary key is not
Manual
30

Locking in JPA

in ObjectDB (and in JPA) is always at the database object level, i.e. each database object is locked separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed
Manual
27

FROM clause (JPQL / Criteria API)

identification variables that iterate over all the database objects of a specific entity class ... over all the Country objects in the database: SELECT c FROM Country AS c The AS keyword is optional ... is required when using multiple range variables. Iteration over about 1,000,000 database objects
Manual
26

SELECT clause (JPQL / Criteria API)

that JPA provides for managed entity objects, including transparent navigation to other database ... The ability to retrieve managed entity objects is a major advantage of JPQL. For example, the following query returns Country objects that become managed by the EntityManager em: TypedQuery
Manual
24

DELETE Queries in JPA/JPQL

As explained in chapter 2, entity objects can be deleted from the database by: Retrieving ... entity objects from the database. Removing entity objects from the database using a DELETE query ... all the objects in the database: DELETE FROM Object DELETE queries are executed using the executeUpdate