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63

Is ObjectDB the only object database that supports JPA?

Other Object database doesn't support JPA? Manikandan ManikandanPalaniappan JPA is designed as ... databases. For example, user defined primary keys and composite primary keys are features of RDBMS (relational databases), which are not supported by most object databases. ObjectDB does support
63

InternalError on query of empty database

Hi, I have reasons for sometimes trying to query the database before anything has been created. The problem is the database throws a InternalException when that happens. Is it possible to throw ... the database about its current schema? Thanks P. pedwards Paul Edwards Sure. Usually a more appropriate
63

Shrinking Database Files

would be with Database Doctor. Is there a way to reclaim database file space? Is it worth trying to reclaim ... context to propose an answer.) CBE CBE ObjectDB reuses space of deleted objects but the database is never resized to a smaller file. Currently the only way to make the database file smaller is to run
63

ObjectDB's Database Doctor Incorrect Error Report

. Looking at the database with ObjectDB's Database Explorer though seems to show that the reference ... Repair is attached. So are the two databases and screenshots of Explorer showing the reference to the object and the existence of the object. CBE CBE There is indeed a problem with this database file
63

Convert embedded database to server

Hello, What is the right way to convert an embedded database to a server one ? As a result ... to the server data directory, start the server, and access the database from your application using ... and cons between an embedded database ( with remote connection enabled ) and a real server instance
63

Performance with large databases

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 ... the ratio between the database size and the available RAM. As long as the available RAM is larger
63

Using the wrong class to access a database

the Point database described in the Getting Started section: package com.objectdb.tutorial ... if I can access the database from here. This program is almost the same as the first; it only calls ... are working fine, but the third ruins the database: - The number of entries is zero. - running the app
63

Database crash

after reading the database file File: ------------------------------------------------------------------------------------------------------------------------ [2017-07-10 11:22:12 #1 store] Database 'F ... on port 3333 has started by 10380@wzbhb101 [2017-07-10 23:06:55 #3 store] Database 'F:\Hummingbird
12

Error in production. Failed to commit transaction: Unexpected database state: BTree -152 is not found

.0_25 (on Linux 3.11.0-12-generic). Please report this error on http://www.objectdb.com/database ... .Read .doGet (115 ): Failed to commit transaction: Unexpected database state: BTree -152 is not found ... database state: BTree -152 is not found (error 613) at com.objectdb.jpa.EMImpl.commit(EMImpl.java:302
12

Locking in JPA

in ObjectDB (and in JPA) is always at the database object level, i.e. each database object is locked separately. Optimistic locking is applied on transaction commit. Any database object ... is being performed on an old version of a database object, for which another update has already been committed

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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