Comparison of OpenJPA with H2 embedded vs OpenJPA with Derby server

Each of the following tables focuses on a specific database operation, where the last table presents average results comparison.

Speed comparison of JPA database persistence operations (normalized score, higher is better)

Transaction Size =>	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	17.1	3.1	5.8	2.7	11.5	2.9
Element Collection Test	10.9	2.0	4.9	1.7	7.9	1.8
Inheritance Test	14.3	3.0	5.9	2.3	10.1	2.6
Indexing Test	24.4	4.7	13.7	4.1	19.1	4.4
Graph (Binary Tree) Test	6.8	0.71	6.7	0.64	6.7	0.67
Multithreading Test	34.2	6.0	10.2	3.8	22.2	4.9
All Tests	17.9	3.3	7.9	2.5	12.9	2.9

The results above show that in general OpenJPA with H2 embedded is much more efficient than OpenJPA with Derby server in persisting JPA entity objects to the database. Comparing the normalized speed of OpenJPA with Derby database server (2.9) to the normalized speed of OpenJPA with H2 embedded database (12.9) reveals that in these tests, OpenJPA with H2 embedded is 4.4 times faster than OpenJPA with Derby server.

A huge performance gap has been detected when using graphs of objects with large transaction size. Comparing the normalized speed of OpenJPA with Derby database server (0.64) to the normalized speed of OpenJPA with H2 embedded database (6.7) reveals that in that case, OpenJPA with H2 embedded is 10.5 times faster than OpenJPA with Derby server.

Speed comparison of JPA database retrieval operations (normalized score, higher is better)

Retrieval Size =>	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	14.6	0.78	27.2	11.6	20.9	6.2
Element Collection Test	0.0046	0.0024	4.3	1.1	2.1	0.54
Inheritance Test	0.011	0.014	7.4	5.0	3.7	2.5
Indexing Test	17.0	0.62	35.0	13.0	26.0	6.8
Graph (Binary Tree) Test	1.0	0.065	1.4	0.39	1.2	0.23
Multithreading Test	18.7	1.6	27.6	19.0	23.1	10.3
All Tests	8.6	0.51	17.1	8.4	12.8	4.4

The results above show that in general OpenJPA with H2 embedded is more efficient than OpenJPA with Derby server in retrieving JPA entity objects from the database. Comparing the normalized speed of OpenJPA with Derby database server (4.4) to the normalized speed of OpenJPA with H2 embedded database (12.8) reveals that in these tests, OpenJPA with H2 embedded is 2.9 times faster than OpenJPA with Derby server.

A huge performance gap has been detected when using database indexes with small retrieval size. Comparing the normalized speed of OpenJPA with Derby database server (0.62) to the normalized speed of OpenJPA with H2 embedded database (17.0) reveals that in that case, OpenJPA with H2 embedded is 27.4 times faster than OpenJPA with Derby server.

Speed comparison of JPA database query operations (normalized score, higher is better)

Retrieval Size =>	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	5.0	29.2	1.1	5.5	3.1	17.3
Element Collection Test	1.7	2.2	1.3	1.4	1.5	1.8
Inheritance Test	2.2	2.2	1.2	1.0	1.7	1.6
Indexing Test	13.8	2.2	23.2	11.7	18.5	7.0
Multithreading Test	1.4	35.5	0.60	8.3	0.99	21.9
All Tests	4.8	14.3	5.5	5.6	5.1	9.9

The results above show that in general OpenJPA with Derby server is more efficient than OpenJPA with H2 embedded in executing the tested JPA queries.

A huge performance gap has been detected when using multithreading with small retrieval size. Comparing the normalized speed of OpenJPA with H2 embedded database (1.4) to the normalized speed of OpenJPA with Derby database server (35.5) reveals that in that case, OpenJPA with Derby server is 25.4 times faster than OpenJPA with H2 embedded.

On the other hand, OpenJPA with Derby server is slower, for instance, when using database indexes with small retrieval size. Comparing the normalized speed of OpenJPA with Derby database server (2.2) to the normalized speed of OpenJPA with H2 embedded database (13.8) reveals that in that case, OpenJPA with Derby server is 6.3 times slower than OpenJPA with H2 embedded.

Speed comparison of JPA database update operations (normalized score, higher is better)

Transaction Size =>	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	10.0	1.5	6.0	4.0	8.0	2.8
Element Collection Test	0.011	0.0081	3.8	1.9	1.9	0.94
Inheritance Test	0.046	0.043	5.0	3.8	2.5	1.9
Indexing Test	8.9	1.8	7.0	6.8	8.0	4.3
Graph (Binary Tree) Test	2.4	0.16	1.3	0.27	1.9	0.22
Multithreading Test	16.6	6.9	4.3	5.0	10.4	5.9
All Tests	6.3	1.7	4.6	3.6	5.4	2.7

The results above show that in general OpenJPA with H2 embedded is more efficient than OpenJPA with Derby server in updating JPA entity objects in the database. Comparing the normalized speed of OpenJPA with Derby database server (2.7) to the normalized speed of OpenJPA with H2 embedded database (5.4) reveals that in these tests, OpenJPA with H2 embedded is 2.0 times faster than OpenJPA with Derby server.

A huge performance gap has been detected when using graphs of objects with small transaction size. Comparing the normalized speed of OpenJPA with Derby database server (0.16) to the normalized speed of OpenJPA with H2 embedded database (2.4) reveals that in that case, OpenJPA with H2 embedded is 15.0 times faster than OpenJPA with Derby server.

Speed comparison of JPA database removal operations (normalized score, higher is better)

Transaction Size =>	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	18.3	1.4	11.1	3.7	14.7	2.5
Element Collection Test	0.012	0.0082	2.9	1.4	1.4	0.71
Inheritance Test	0.030	0.035	6.6	2.5	3.3	1.3
Indexing Test	23.2	2.3	9.7	3.5	16.4	2.9
Graph (Binary Tree) Test	1.8	0.13	2.4	0.35	2.1	0.24
Multithreading Test	31.2	3.6	17.3	4.0	24.2	3.8
All Tests	12.4	1.3	8.3	2.6	10.4	1.9

The results above show that in general OpenJPA with H2 embedded is much more efficient than OpenJPA with Derby server in deleting JPA entity objects from the database. Comparing the normalized speed of OpenJPA with Derby database server (1.9) to the normalized speed of OpenJPA with H2 embedded database (10.4) reveals that in these tests, OpenJPA with H2 embedded is 5.5 times faster than OpenJPA with Derby server.

A huge performance gap has been detected when using graphs of objects with small transaction size. Comparing the normalized speed of OpenJPA with Derby database server (0.13) to the normalized speed of OpenJPA with H2 embedded database (1.8) reveals that in that case, OpenJPA with H2 embedded is 13.8 times faster than OpenJPA with Derby server.

Comparison of JPA/Database speed - the averages (normalized score, higher is better)

Transaction/Retrieval Size	Few Entities		Many Entities		Average Score
	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server	OpenJPA H2 embedded	OpenJPA Derby server
Basic Person Test	13.0	7.2	10.2	5.5	11.6	6.4
Element Collection Test	2.5	0.84	3.4	1.5	3.0	1.2
Inheritance Test	3.3	1.1	5.2	2.9	4.3	2.0
Indexing Test	17.5	2.3	17.7	7.8	17.6	5.1
Graph (Binary Tree) Test	3.0	0.27	3.0	0.41	3.0	0.34
Multithreading Test	20.4	10.7	12.0	8.0	16.2	9.4
All Tests	10.2	3.9	8.8	4.5	9.5	4.2

The results above show that in general OpenJPA with H2 embedded is more efficient than OpenJPA with Derby server in performing JPA database operations. Comparing the normalized speed of OpenJPA with Derby database server (4.2) to the normalized speed of OpenJPA with H2 embedded database (9.5) reveals that in these tests, OpenJPA with H2 embedded is 2.3 times faster than OpenJPA with Derby server.

A huge performance gap has been detected when using graphs of objects with small transaction/retrieval size. Comparing the normalized speed of OpenJPA with Derby database server (0.27) to the normalized speed of OpenJPA with H2 embedded database (3.0) reveals that in that case, OpenJPA with H2 embedded is 11.1 times faster than OpenJPA with Derby server.

JPA Performance Benchmark (JPAB)