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[protege-owl] Query: Upper-bound of Protege 3.4 individual capacity
wfitzgerald at tssg.org
Wed Oct 29 07:59:38 PDT 2008
What is the upper-bound on the amount of individuals in an OWL-DL
ontology before Protege 3.4 crashes?
Personally, I have a latitude d510 running Ubuntu Hardy with 1GB RAM,
latest *Full* version of Protege 3.4 build 513 and the java 1.6 VM.
I modified the heap space from 209715200 bytes to:
I have used DataMaster to import the "Vulnerabilities" Table from the
Open Source Vulnerabilities Database (OSVDB) stored in a MySQL database
also running on my laptop.
It contains 48,0000 instances when imported into the ontology.
I cannot import using DataMaster the other tables without a crash. I
estimate if the entire OSVDB database was to be imported into an
ontology there would be around 100,000 instances. I also intend on using
instances from other sources, so my ontology has the potential to be large.
The current security ontology I have now populated with just the OSVDB
Vulnerabilities Table is very slow to load when opening it with Protege IDE.
I then tried to work with what knowledge (instances) I had and to
reclassify various individuals of the Vulnerability class into more
specialised classed (for example, BufferOverflowVul). To do this I
decided to write some SWRL rules to look at each individual and its
data-properties (DataMaster creates data-properties and doesn't
currently include an object properties option) to make a decision as to
where that individual can be re-classified.
However, SWRL-Jess runs out of memory when I execute a single SWRL rule
or query. Presumably this is due to the fact that JESS uses its own
memory space (I could be wrong!). And the fact that protege uses a lot
of the limited memory already.
How do people deal with large knowledge bases? Is it a matter of
installing more RAM?
| William M. Fitzgerald (MSc, BSc) |
|Researcher | PhD Student |
|Telecommunications Software & Systems Group,| Computer Science Dept., |
|ArcLabs Research and Innovation Centre, | University College Cork,|
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