Fast Object Database for Java - with JPA/JDO support

Slow loading from db

#1

Hi,

I am struggeling with trying to load a larg-ish dataset using objectDB 2.8.3 (JDO). I am new to ObjectDB and JDO, so I may be doing something stupid here :-).

I have a somewhat complex data structure, where one parent object holds a Map over child objects, which in turn have some one-to-one and one-to-many relationships (a mock-up of a still more complicated real-world scenario). Saving the parent object with 100.000 child objects takes some few seconds; loading the same data set takens a long time (more than 10 minute, maybe hours?). I am using "pm.getFetchPlan().addGroup(FetchGroup.ALL)"  in order to load all objects at once. For smaller datasets (10.000 child objects) there are no issues. During the load, the program is using a lot of memory, but still not up to the given limit.

I suspect the problem is related to the one-many-relationships. Probably, during save the objects are written to the db without much overhead. But during retrieval, for each object the corresponding record must be found...

Any help is much appreciated!

#2

If your classes are not enhanced - try enhancement to improve performance.

In addition, try to reduce the number of objects that you load into memory at any given time.

If possible, please provide a minimal runnable example that demonstrates the issue.

ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)

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