Fast Object Database for Java - with JPA/JDO support

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WHERE clause (JPQL / Criteria API)

and then collected as query results. WHERE Predicate and Indexes Formally, the WHERE clause functions as a filter between the FROM and the SELECT clauses. Practically, if a proper index is available, filtering is done earlier during FROM iteration. In the above population query, if an index is defined

Database Management Settings

" synchronized="false" /> <index-update enabled="true" priority="40" /> index-update> element <index-update enabled="true" priority="40" /> The <index-update> element specifies how new defined

Is ObjectDB scalable? What are its limitations?

classes per database file. Up to 2,147,483,648 indexes per database file

combined index not used

.nodePath, In the class Action we have a combined index (see attachment) but in the query plan we can see that this index is not used: Query Plan Description ... ------------------------------------ [Step 1a] Scan index com.agile.hummingbird.Action[endDate] locating all the Action (a) instances

Chapter 2 - JPA Entity Classes

Explains how to define and use JPA entity classes and other JPA persistable types.

ORDER BY clause (JPQL / Criteria API)

Explains how to use the ORDER BY clause in a JPA/JPQL query.

JPA Primary Key

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.

possible index required for improving query performance

Hi, I have the following entity class: @Entity @Table @Indices({ @Index(members={"relationshipType", "party"}), @Index(members={"relationshipType", "otherParty"}), @Index(members ... a linear way as the number of relationships and BaseObjects grow. The query is using two indexed fields

Composite indexes

Hi, I read your manual about defining Indexes for JPA Entities (, but I still have some problems understanding how and when should I use them. Let's ... or false (...) } Here are my questions regarding composite indexes : #1. First

ObjectDB Object Database Features

result cache (for repeating queries with the same arguments). Many other internal caches. Indexing Single field and multi field (composite) indices. Collection and array elements are indexable (extremely fast JOIN queries). Map keys and values are indexable. Nested paths inside embedded objects

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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