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57

Time Sequence Object Command DB

We (www.s2ssystems.com) have a time-sequential object command database. I would like ... commands are generally used to trigger creation of transient objects. The database can be branched ... again that the database is not an object database, but rather a command database. You can of course think
57

Soft Reference Object Cache Recommendation

limit being exceeded before the post attempt. =( ) I desire to have my persistent objects be cached ... for my application. This would use a Least Recently Used (LRU) mechanism to get rid of older objects ... [] and instruct ObjectDB to use soft reference for its Level One (L1) object data cache. I disable the L2 cache
55

500Mb ObjectDb database opening issue

Hi, I have observed that 500 Mb objectDb database opening time is very slow (~3 seconds ... any way to speed-up open time for big databases? Definitely, it's too long for 500 Mb database! We gonna work with ObjectDb databases which may have size more than 5Gb and opening database time
55

em.flush(); em.clear(); loosing data and not persisting managed objects

objects to database. Sometimes it does other times it doesn't. Here is my Entity. import javax ... ). Please report this error on http://www.objectdb.com/database/issue/new com.objectdb.o ... system called CMVC, since I don't have direct access to that database to get the data directly. The code
55

OutofMemory error with Object DB 2.0

after persisting 200 records and then the same transaction object from the same PersistentManager ... .commit(EMImpl.java:279) at com.anritsu.eu.database.DatabaseImplementation.storeItem(Unknown Source) at com.anritsu.eu.database.DatabaseMessageStorer.newItemParsed(Unknown Source) at com.anritsu.eu
11

WHERE clause (JPQL / Criteria API)

JPQL query that retrieves selective objects from the database. Out of the four optional clauses ... over all the Country objects in the database using the c range variable. Before passing these Country ... with millions of objects in the database there is a huge difference in query execution time if proper
11

What is the Java Persistence API (JPA)?

. Using plain old Java objects (POJO) to represent persistent data can significantly simplify database ... and objects). ObjectDB is the only database management system with built in support of the Java ... The Java Persistence API (JPA) is a standard API for accessing databases from within Java
11

each 1-2 days objects on some objectdb level lock/block each other

queries without any object manipulation in these threads hgzwicker Hans-Georg Zwicker ... the database file using the new "objectdb.temp.concurrent-file-read" option. In both cases ... now urges to switch to another database. we try to agree on a bit more time, but the situation
11

JPA Exceptions

to retrieve entity objects from the database. For example, when a required entity object is not found: or ... JPA exceptions are represented by a hierarchy of unchecked exceptions: java.lang.Object java ... , an attempt to update the database with no active transaction is represented by: Database update
11

Database access error , Doctor hanging on trying to repair, production shutdown at our biggest customer

. There is one database page with a missing entry, which is part of one large ObjectProperty object ... we have a database shutdown, logs are showing: [2017-07-10 21:07:23 #1 store] Database 'F ... : SectionClassifier{2->merger[2699]-missing:1} on running Doctor it hangs after reading in the database, just

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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