Table 2.

The loading and querying performance analysis of three semantic web prototype applications.

Application	Environment	Repository	Triples	Storage	Query Time
GORouter	Dual processors of 1.66 GHz, 2 GB RAM	Oracle 10g NDM	5.5 M	Disk + Memory	0.74 s
AllegroGraph	Dual processors of 1.8 GHz, 16 GB RAM	AllegroGraph	6.88 M	Disk	172 s
YeastHub	Dual processors of 2 GHz, 2 GB RAM	Sesame	1.4 M	Memory	38 s

Performance analysis of three semantic web prototype applications:GORouter, AllegroGraph and YeastHub. In this table, the AllegroGraph http://www.franz.com/products/allegrograph/ project used the disk approach to query "LUBM50, Lehigh U. Benchmark" datasets (about 6.88 million triples). The retrieval speed is about 0.04 million triples per second. The YeastHub http://yeasthub.gersteinlab.org project uses the main memory approach to query the UniProt data file (about 1.4 million triples).