About Index

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FAQ
45

Is ObjectDB scalable? What are its limitation?

classes per database file. Up to 2,147,483,648 indexes per database file
Manual
41

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
Manual
34

Chapter 2 - JPA Entity Classes

Explains how to define and use JPA entity classes and other JPA persistable types.
Manual
34

JPA Primary Key

Explains how to define and use primary keys in JPA, including composite and embedded primary keys.
Manual
34

ORDER BY clause (JPQL / Criteria API)

Explains how to use the ORDER BY clause in a JPA/JPQL query.
Result
23

ObjectDB Object Database Features

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 are indexable. Indices are also used for fast ordering and aggregate calculations
Forum
19

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
Result
18

What is new in ObjectDB 2.0?

ObjectDB 2.0 supports many new features and improvements, including: Most of the features of the new JPA 2.0 and JDO 2.2 APIs. User defined IDs (primary key) and sequences. Support of unlimited index ... query execution. Support of composite indexes and using indexes in query result sort. Improved query
Forum
18

Composite indexes

Hi, I read your manual about defining Indexes for JPA Entities (http://www.objectdb.com/java/jpa/entity/index), but I still have some problems understanding how and when should I use them.   Let's ... ; // either true or false (...) }   Here are my questions regarding composite indexes : #1. First
Forum
17

composite index not used in query

we defined a composite index for class Action: @Index(name="ssst",members={"startDate","state","subType","type"}) and an index for the OneToMany @OneToMany(fetch=FetchType.LAZY) @Index public ... ')) and (a.state = 3 and a.subType = 3 and a.type = 0 and a.startDate > ?1)) the composite index is not