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2

JPA vs JDO - which is more efficient for OneToMany queries?

. A query will still be executed (i.e. navigation from Customer to Order will run an automatic query ... implementation and requires a JOIN table and a query for navigation, is implemented differently in ObjectDB ... . But assuming that navigation is mostly from the customer to the orders, when using ObjectDB a collection
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2

Mapped By Fetch is very Slow

is the owner. Therefore, only the child contains a reference to the parent. Navigation from the parent ... relationships you should try to make the side from which navigation is more likely as the owner, by ... mappedBy at all.  That will make navigation in both directions faster but will require updating both sides
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2

Object explorer cannot open odb file. ObjectDB many-to-many relationship

with ObjectDB. Just be aware that navigation from the mapped by (inverse) side to the owner side is slower ...  relationships (with no mapped by). You will have to maintain both sides, but navigation may be faster since no queries will be required. This ability (of navigation in the to many direction
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2

Soft Reference Object Cache Recommendation

.  Then one can navigate to Classes, double click "byte[]" to view its instances, click "Compute retained sizes ... , thus keeping the byte[]s from being GC.  Supposedly, one can navigate the selected JdoBlob2 object's ... Personnel can recognize or decode.  Using the heap dump I navigate through a lot of unrecognizable
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1

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

="include" typeId="5" binding="null" nav="1"> <navigations ... " /> navigations>
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1

Error using query with MAX() function

="null" nav="1"> <navigations> navigations
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1

Explorer in 2.3

First, the new Explorer in ObjectDB is fantastic! This is exactly what we've needed - an easy way to do ad-hoc JPQL queries and navigate through the results and even make small changes to primitive ... . This should also apply to collections that are opened while navigating the results. My initial result
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1

ObjectDb Supports Clustering of Servers?

lazily and then navigate to each element separately, each navigation requires a separate round trip to the server. Thanks Alot.. janu019
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1

Problems down-casting in WHERE clause

in JPQL because messageList is a List and navigation from a list must be done by an additional variable. ObjectDB supports navigation from lists as an extension, so the following query is valid
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1

query on calendar class

.persistence.PersistenceException Navigation from 'java.util.Calendar' through 'DAY_OF_WEEK ... ) Caused by: com.objectdb.o.UserException: Navigation from 'java.util.Calendar' through 'DAY_OF_WEEK