About Index

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Forum
16

Indexing a field results in internal Exception

a problem with indexing. An index on a String field is required to give good performance but if I add the @Index annotation to the field I eventually end up with an ObjectDB internal exception.  This is reproducible, as is the program running to completion (slowly) if I remove the @Index annotation
Forum
16

Slow searching with two indexes

a performance problem using two indexes.  An entity I'm querying has two indexed fields ... : select from Thing where reference == :objectReference order by id desc when an index is defined on the reference field should use that index and avoid a full scan. Does it run fast if the ORDER BY
Forum
16

Temporary disabling of indexes?

When populating a large database with objects that have indexed fields takes very much longer than populating the database with those objects if the index definitions are removed.  Is it possible to indicate in some way that for a particular use of the database indexes are to be ignored
Issue
15

Index Rebuilder

When a new index is added to an existing entity classes that already has instances in the database ... data. The Index Rebuilder tool will enable rebuilding indexes, synchronizing their data ... , in which such new indexes will be enabled. Version 2.6.6 introduces a built in automatic builder
Forum
15

Is there an administration tool with which I could create extra indexes?

Hello, I have composite index, and it was working fine, but now I need to add more features to the software and I need to throw more indexes in there. I wanted to know what's the best way to do this. 1. Have some admin tool CREATE INDEX..... ON a.b or 2. add more @Index to the object entities. in
Forum
15

Adding indexes on existing entities.

Is it safe to add indexes on an existing entity class? Thanks. Safe, but to enable the new index ... that the index is registered in the database by opening the database when it has access to the new index ... . Update: Starting ObjectDB 2.6.6 new indexes are automatically built and activated in the background
Forum
15

is JDO field attribute "indexed" supported?

seem to have specific documentation for this. Your documentation for JDO annotation @Index mentions that it corresponds to the XML <index> element which is one way to specify indexes in XML metadata. But there is another way which is to specify an indexed attribute on the field element, like
Forum
15

Create simple index for a Id field

Hello, I just wanted to write another anotation to my key field so I can have a really simple index ... just want my key to be indexed on my db, just like this: @Entity public class ObjectDbEntity implements DataItemProvider {        @Id     @Index     private Key key = null
Forum
15

JDO @Index in JPA?

Hi! I have a project which has all entities as JPA entities. I would like to make use of indexing ... : will adding JDO @Index in a JPA entity have any effect or I have to switch that entity to JDO? Question2 ... with JPA without any additional change. If you add an index to an existing entity class
Issue
15

Can not have unique index on Byte Array

more Unique is implemented by ObjectDB by an index that does not allow duplicate keys. An index ... . Note also that an index on a collection or array will not be useful in queries that compare ... the collection or array, e.g. using a JOIN query. This is because every element is indexed as