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ObjectDB Clustering VS Hadoop Hbase

, the ObjectDB clustering can not support a database whose size is beyond the size of the master node

Performance tuning, best practices

" /> <network inactivity-timeout="0" /> <url-history size="50" user="true" password="true" /> <log path ... /" retain="90" /> <logger name="*" level="info" /> </general> <database> <size initial="256kb" resize

RT Java application recording into 100DB run OOM after a few hours.

are per database. For example, the default cache size for database pages is 64GB per database, or 6.4GB per 100 databases, so it can easily exceeds your VPS RAM. If you must keep 100 databases open concurrently then you will have to reduce cache sizes, etc. support Support

List of Enum Values in an entity

.toString(flags.size());   System.out.println("    Number of Flags: " + flagNumber);   System.out.println ... + " (signed on " + signingDate + ")";   if (flags != null && flags.size() > 0) {    for (GuestFlag

Compress ODB file with XML content

Harman company requested to reduce ODB size as much as possible after database created and one of unliked solution was to use ZIP/UNZIP after/before use object DB database. Harman would like to ask ... size up to 50 times. Additional info: https://www.objectdb.com/issue/23 Harman Alexander Golyshkin

Schema-Update: Rename superclass and remove one subclass

", RenamedSuperClass.class); List<RenamedSuperClass> result = q.getResultList(); System.out.println("size: " + result.size()); We get an exception: [2016-11-14 10:48:56 #1 *] java.lang.NullPointerException

Wrong data stored in time only fields

'})");         List resultList = q.getResultList();         if (resultList.size() > 0) {             System.out.println("FAILED records " + resultList.size());             System.out.println

Change path for urls2.xml file

to the user.home directory. But you can disable it by specifying 0 as the maximum history list size:     <url-history size="0" user="true" password="true" /> The url history is used to enable

I can't get cascading delete to work in JDO

>)query.execute();         System.out.println("Holders: " + holders.size());         query.closeAll ... <Dependent>)query.execute();         System.out.println("Dependents: " + dependents.size

Issue with TYPE expression in Criteria API

.createQuery(cq).getResultList();         System.out.println("Size: " + resultList.size

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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