Re: Performance degraded with MS SQLServer backend for Protege 3.4.8

On 8/23/12 12:11 PM, Ron Schultz wrote:
> Are there any benchmarks for expected performance of the database 
> backend? Can I expect to manage thousands, or hundreds of thousands, 
> or millions of records with the backend? Are there any user 
> experiences reported for using Protege backend for ontologies with 
> hundred of thousands instances?

I think that, for the Protege database backend, this is the wrong 
metric.  The problem is that the database is an internal structure and a 
record count does not relate to the nature of the ontology being 
loaded.  In particular, row counts might be very different for the 
Protege 3 database backend and the Clark-Parsia database backend which 
both work with the Protege 3 api.  That said there was a group that 
worked with a database on a day to day basis that had somewhere near 2 
million rows.

More ontological measurements of that same ontology include:

  * 1.2 million axioms
  * 121 thousand logical axioms
  * 87 thousand classes


-Timothy



> Thanks
> Ron
>
> On Wed, Aug 22, 2012 at 12:18 PM, Jonathan Carter 
> <[email protected] 
> <mailto:[email protected]>> wrote:
>
>     Some of my user community and I have noticed that the performance
>     of Protege 3 (Frames) has changed significantly for the worse
>     between version 3.4.4 and version 3.4.8 when using a MS SQLServer
>     database backend.
>
>     Protege 3.4.4 performs well with large numbers of instances backed
>     by SQLServer whereas 3.4.8 seems noticeably slow.
>     Performance is much the same for both versions (or possibly better
>     in Protege 3.4.8) for file-based projects and MySQL database backends.
>
>     Is there anything that's changed in the database handling between
>     these versions that might explain this (and might also be in 3.5B)?
>     Has anyone else had a problem with performance and database
>     backends with 3.4.8?
>
>     Thanks
>
>     Jonathan
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> -- 
> Ron
>
>
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