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55

Speed of queries that return many objects

sequentially. Apparently your use case is not a standard database (or object database) activity ... if this is something I should investigate. So I created a database with 1_000_000 dummy entities (example ... objects is more than you may expect and much slower than just reading the data from the disk. Using
54

Entity listener - event instead of object

that you use to update object. So, how to get old version of given entity from database to check ... in updated entity. There is a problem however with accessing "old" version of object stored in database. I can't find the nice way to use EntityManager in EntityListener. Because of that, I can't
54

Unexpected exception during open the database

Hello, do have an idea why we get following exception sometimes, if we open a database? Exception 1 ... your company. The problem seems to be related to opening and closing the database for a short period ... block from objectdb.conf all works fine during opening the database. The automatic index update is not
54

Queries are slow on a large database

managed to figure out: how to get the total number of object in a database without retrieving ... Hi, I have a 12GB database with 787603 entries. It is much larger than usual ... have to scan the entire database file and is not using indexes. Therefore I think I am not doing
54

2.7.3_03 Erroneous "Attempt to modify a primary key of a managed object"

to save/restore the object into/out of the database. Another user might try to navigate and enter ... key of a managed object", but my application is not trying to change the primary key. (ObjectDB log ... the id field to a simple String without database schema change, and save some space in memory
54

Listing large number of complicated objects with paging.

query manager fetchSize is like all objects in database: <newQueryResponse isUnique="false ... 'Product' (attached to this post) entities in database and I'm trying to speed listing them with paging ... and "warming up" database file, query runs for about 1.5 (best) to 6 (worst) sec: 2011-11-15 19:30:59
11

References to objects of missing obsolete entity classes

itself, is it correct that the objects are in the database but their classes have been deleted or missing? The objectdb explorer does not show any objects of the given class in the database. The class ... version of our product (see below). These entities are not present in the database and the error does
10

new objects not available in mappedBy associations

automatically when the object is retrieved from the database again. Try to refresh the department object ... again unless the object is retrieved again from the database (and not from the persistence context cache ... > employees; creating a new mapped class, e.g. new Employee, won't result in this object being available in
10

InternalException - error reading field from "queue" database

that is missing in this database. What do you store in that field? entity objects? embeddable objects? serializable objects? Did you use that specific database in replication? Maybe this is related ... I trying to use an objectdb database as a persitent queue but have started getting the following
10

cannot delete objects after crash (see issue 2283)

after the crash we cannot delete specific objects, see screenshots of explorer. Database ... objectdb hgzwicker Hans-Georg Zwicker meanwhile the database became completely unusable ... . support Support we upload currently the database before Doctor to our extranet, coreSystemDb_.rar

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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