Fast Object Database for Java - with JPA/JDO support

Difference performance in ObjectDB Explorer and in java project

#1

Hello,

I am learning ObjectDB and i noticed that the queries that are executed in  ObjectDB Explorer are faster (about 5 ms) than queries in my project (~400 ms).

Here is my JPQL query : 

SELECT p FROM Point p WHERE p.x=0

I am using Point entity class from tutorial, but with Indexed "x" field and database contains 999,999 points with random coordinates.

Am i missing something or it is a feature of explorer?

P.S. Two source files are attached.

#2

Queries are executed in the Explorer in a special lazy mode, which is faster in returning the results, but requires further round-trips to fetch related data.

You can try it also from your program:

    query.setHint("objectdb.result-fetch", "LAZY");
ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)
#3

Thank you, is where any other useful hints for object db? Performance is better, but still not the same 1000 ms in my project and about 300 ms in explorer

#4

See this manual page regarding the query hints.

If your classes are not enhanced then try enhancing them.

ObjectDB Support
ObjectDB - Fast Object Database for Java (JPA/JDO)
#5

Appreciate your help

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