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Performance with large databases

significantly by a larger database. support Support Is fetching an object by the id faster ... When populating a large database (10s of GBs) performance drops suddenly at a certain time whenever I run the populating application. Is there typically a database size when indexes can no longer

First query before any of the object has been stored

I have some code that, before writing an object via ObjectDB makes a query to ensure the new object is different from what's already stored. The problem is that, before any instances of that object ... other persistence related exception. How can I know if any of an object has been stored

internal object DB locking in an embedded multi threaded application

to how we can improve / elviate this? our database files are between 100 and 500 meg when this occurs. It doesnt ... database file resizing. You may try avoiding file resizing by setting relevant configuration (mainly the initial database size). support Support If no conf file is found or provided

Example database world.odb

database to the standard output in JSON format. You will need google-gson in order to run it. support Support Thanks a lot! How to save to World database persistent objects that describes ... Hello! Where can I find classes for example database world.odb? Thanks for the answer. Robin_2005

Doctor for large database

Hi, I am trying to fix database file with more than 1 million objects. The Doctor refused to finish ... ? (I have site license) Thanks, -- Creating a database copy... .................................................. 1000000 objects ..com.objectdb.o.UserException: Too many persistent objects

calling persist on an object more than once

help message (ie: 'you called persist more than once on object xxxx'), and b) to throw the exception ... but very inefficient, since usually persist does access the database, so checking for existing entity in the database is only performed on commit or flush. support Support

[Explorer] Editing Database Files

databases in a read only mode. The Explorer should support creating and storing new database objects and editing and updating existing database objects, visually, with no code. This is one of the features ... Support Editing databases in the Explorer is now supported by ObjectDB 2.3. support Support

Index Definition

Querying without indexes requires iteration over entity objects in the database one by one. This may take a significant amount of time if many entity objects have to be examined. Using proper indexes ... . When an entity object is stored in the database every indexed field must contain either null or

Auto Generated Values

number generator for every database. This number generator is used to generate automatic object IDs for entity objects with no primary key fields defined (as explained in the previous section). The same ... a primary key for every new entity object. These generated values are unique at the database level

Error reading UTF string (Serialized Objects in Explorer)

.MitgliedVertraegeFragment')).contracts IS EMPTY))) quasado Alexander Adam The attached database is empty ... handling failed deserialization better. Still, you cannot see serialized objects in the Explorer ... object also in your application - please provide the exception stack trace (when using the last build

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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