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12

locks on pure query activities

="false" stderr="false" /> <log-archive path="$objectdb/log/archive/" retain="90" /> <logger ... " /> <recovery enabled="true" sync="false" path="." max="128mb" /> <recording enabled="false" sync="false" path="." mode="write" /> <locking version-check="true" /> <processing cache="2048mb
12

Performance tuning, best practices

="$objectdb/log/" max="8mb" stdout="false" stderr="false" /> <log-archive path="$objectdb/log/archive ... ="256kb" page="2kb" /> <recovery enabled="true" sync="false" path="." max="128mb" /> <recording enabled="false" sync="false" path="." mode="write" /> <locking version-check="true" /> <processing cache
12

Out of memory

/" max="8mb" stdout="false" stderr="false" /> <log-archive path="$objectdb/log/archive ... " /> <recovery enabled="true" sync="false" path="." max="128mb" /> <recording enabled="false" sync="false" path="." mode="write" /> <locking version-check="true
2

close()

, getTransaction, and isOpen (which will return false). If this method is called when the entity manager
2

javax.persistence.JoinColumn

to a primary key that is part of a foreign key. Default value: false Since: JPA 1.0 boolean updatable
0

isDirty(pc)

PersistenceCapable return false. Parameters: pc - the PersistenceCapable instance. Returns: true if the parameter
0

setFilter(filter)

, which would throw NullPointerException, is treated as if the filter expression returned false
0

isTransactional(pc)

false. Parameters: pc - the PersistenceCapable instance. Returns: true if the parameter instance
0

isPersistent(pc)

Static Method javax.jdo.JDOHelper boolean isPersistent( Object pc ) Tests whether the parameter instance is persistent. Instances that represent persistent objects in the data store return true. Transient instances and instances of classes that do not implement PersistenceCapable return false
0

javax.jdo.spi.JDOImplHelper

if the instance satisfies the state interrogation; Boolean.FALSE if the instance does not satisfy

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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