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EM close causes an exception

. We had to change the implemention so that it works also in Linux. Do you need a hint how we solved the access ... or a separate issue? Of course, any hint on how to improve ObjectDB will be appreciated ... . If this is the case than it could be a hint for a possible fix. Does it happen only on Linux? Does

how to query by properties of onetomany relations? (Error 990)

for the hint chris Christoph Ernst Support of direct navigation from collections (with no JOIN ... using standard JPQL by setting the following query hint: em.setProperty("objectdb.query-language ... extensions. When the query language is set to JPQL using a hint the following exception is thrown

Is 2 level cache in use?

and by navigation (and not in queries). You may try the following undocumented ObjectDB query hint ... indexes without accessing the primary data. Currently this hint must be set at the query level (as demonstrated above) - but it should be supported in all other query hint scopes in future versions

Pessimistic Lock Timeouts setting

. However, there is a standardised query 'hint' that can be setup to make the underlying DB lock a record for a specific time. The hint property is: "javax.persistence.lock.timeout" I have a situation ... this area (hence why they made it a 'hint' - that should be considered non-portable). Thanks

Listing large number of complicated objects with paging.

running the query with a lazy fetch hint (as done by the Explorer). Another solution may be to use ... creating 55k ProductListTO() objects? I will try lazy fetch hint, but as I understand it will run ... just set lazy hint. Query plan is a little bit different in this case: [2011-11-15 23:25:20 #297

a REPLY button will be good!

Hi, all: This bbs is wonderful, clean, fast. But it has no REPLY button, that can add a hint ... topic, if a hint like this will be good: On 5/13/2011 11:46 AM, James007 wrote at floor 3: > line 1 > line 2 ... gzdillon Lai Yang If no hint, just a link back to the topic is ok: James Bond wrote : 189?u#item-1 HTH gzdillon Lai Yang

Need help to analyse very high memory usage by objectdb (PRU, SEV, VAL[])

consumption yet. Can you give us any any hints, which leads to the generation of these objects ... kind of hints would help us to analyse/fix our problem. We use version 2.6.9_08 in embedded mode. btc_es BTC EmbeddedSystems Small hint @ObjectDB (not related to this thread): I got the following

Best practise loading big data

that, too. We would kindly ask you to give us some hints or advice how to access the data or how to configure the DB ... then we can do that instead. Thanks for this hint! Yes, only enhanced classes are used in this example ... for that. Your hint regarding the iterator is very helpful to understand how the entities are referenced. I


Method javax.jdo.datastore.Sequence void allocate( int additional ) Provides a hint to the implementation that the application will need additional sequence value objects in short order. There is no externally visible behavior of this method. It is used to potentially improve the efficiency


at transaction completion. This method allows the application to explicitly provide a hint

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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