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12

Occasionally slow requests in load testing

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

isLoaded(entity)

state is to be determined Returns: false if the entity has not been loaded, else true Since: JPA 2.0
2

isMember(elem, collection)

Method javax.persistence.criteria.CriteriaBuilder Predicate isMember( Expression<E> elem, Expression<C> collection ) Create a predicate that tests whether an element is a member of a collection. If the collection is empty, the predicate will be false. Parameters: elem - element expression
2

isFalse(x)

Method javax.persistence.criteria.CriteriaBuilder Predicate isFalse( Expression<Boolean> x ) Create a predicate testing for a false value. Parameters: x - expression to be tested Returns: predicate Since: JPA 2.0
2

isMember(elem, collection)

Method javax.persistence.criteria.CriteriaBuilder Predicate isMember( E elem, Expression<C> collection ) Create a predicate that tests whether an element is a member of a collection. If the collection is empty, the predicate will be false. Parameters: elem - element collection - expression Returns: is-member predicate Since: JPA 2.0
2

isMember(elem, collection)

Method javax.persistence.criteria.CriteriaBuilder Predicate isMember( Expression<T> elem, Expression<T> collection ) Create a predicate that tests whether an element is a member of a collection. If the collection is empty, the predicate will be false. Parameters: elem - element expression
0

retrieveAll(pcs, useFetchPlan)

fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding
0

retrieveAll(pcs, useFetchPlan)

fetch group. If the useFetchPlan parameter is false, this method behaves exactly as the corresponding
0

setDetachAllOnCommit(flag)

Method javax.jdo.PersistenceManager void setDetachAllOnCommit( boolean flag ) Sets the detachAllOnCommit setting. DetachAllOnCommit set to false specifies that the state of persistent instances in the cache after commit is defined by the retainValues flag. With this flag set to true
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setCopyOnAttach(flag)

Method javax.jdo.PersistenceManager void setCopyOnAttach( boolean flag ) Sets the copyOnAttach setting. CopyOnAttach set to true specifies that during makePersistent, copies are made of detached parameter instances. With this flag set to false, detached parameter instances are attached directly

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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