Re: linked data hosted somewhere

Hugh Glaser wrote:
> I thought that might be the answer.
> So what is the ontology of the error, so that my SW application can deal with it appropriately?
> If it ain’t RDF it ain’t sensible in the Semantic Web.
> ;-|
> And the “entitlement” to spend lots of money by accident; a bit worrying, although I assume there are services that allow me to find out at least estimates of the cost.
>   
If you are querying via iSQL or the Virtuoso Conductor you wont be 
moving lots of data between your desktop and EC2. If you do large 
constructs over the sparql protocol or anything else that produces large 
HTTP workloads between EC2 and your location, then you will incur the 
costs (btw - Amazon are quite aggressive re. the costs, so you really 
have to be serving many client i.e., offering a service for costs being 
a major concern).

Anyway, Virtuoso let's you control lots of things, including shutting 
down the sparql endpoint. In addition, you will soon be able to offer 
OAuth access to sparql endpoint etc..
> I suspect that your comment about a bill is a bit of a joke, in that normal queries do not require money?
> But it does raise an interesting LOD question.
> Ravinder asked for LOD sets; if I have to pay for the query service, is it LOD?
>   
You pay for traffic that goes in and out of your data space.

(effective November 26, 2008)
Fixed Costs ($)   
One-Time Charge:    49.99    one-time charge    Initial Setup & 
Configuration.
Recurring Monthly Charge:    19.99    recurring charge     Basic Support 
(5 case tickets per month)

Variable Costs ($) re. Amazon EC2 running Linux/UNIX Box Usage:   
0.20    per Small instance-hour (or partial hour) consumed     
0.80    per Large instance-hour (or partial hour) consumed     
1.60    per Extra Large instance-hour (or partial hour) consumed (First 
96 Hrs)     
0.90    per Extra Large instance-hour (or partial hour) consumed (Over 
96 Hrs)     
0.40    per High-CPU Medium instance-hour (or partial hour) consumed 
(First 96 Hrs)     
0.30    per High-CPU Medium instance-hour (or partial hour) consumed 
(Over 96 Hrs)     
1.60    per High-CPU Extra Large instance-hour (or partial hour) 
consumed (First 96 Hrs)     
0.90    per High-CPU Extra Large instance-hour (or partial hour) 
consumed (Over 96 Hrs)     
Data Transfer In:    0.20    per GB of data transfer in     
Data Transfer Out:    0.36    per GB of data transfer out     
Data Transfer Regional:    0.05    per GB of regional data transfer in/out


Here is a purchase link that also exposes the items above.
https://aws-portal.amazon.com/gp/aws/user/subscription/index.html?ie=UTF8&offeringCode=6CB89F71

Of course, you can always use the Open Source Edition as is and 
reconstruct DBpedia from scratch, the cost-benefit analysis factors come 
down to:

1. Construction and Commissioning time (1 - 1.5 hrs vs 16 - 22 hrs)
2. On / Off edition variant of live DBpedia instance that's fully tuned 
and in sync with the master
> Getting back to dealing with awkward queries.
> Detecting what are effectively DoS attacks is not always the easiest thing to do.
> Has Bezzo really solved it for a SPARQL endpoint while providing a useful service to users with a wide variety of requirements?
>   
I believe so based on what we can do with Virtuoso on EC2.  One major 
example is the backup feature where we can sync from a Virtuoso instance 
into S3 buckets. Then perform a restore from those buckets (what we do 
re. DBpedia). In our case we offer HTTP/WebDAV or the S3 protocol for 
bucket access.
> In fact, people don’t usually offer open SQL access to Open Databases for exactly this reason.
> I like to think the day will come when the Semantic Web is so widely used that we will have the same problem with SPARQL endpoints.
>   
The Linked Data Web is going to take us way beyond anything SQL could 
even fantasize about (imho). And one such fantasy is going to be 
accessible sparql endpoints without bringing the house down :-)

Kingsley
> Best
> Hugh
>
> On 25/11/2008 22:48, "Aldo Bucchi" <aldo.bucchi@gmail.com> wrote:
>
> Yes!
>
> You will probably get an error and a bill by the end of the month for
> the CPU you consumed doing that incredibly smart question.
> Sounds pretty sensible to me, sort of what you'd expect from a
> rhetoric question.
>
> ;)
>
> Much better than wrecking havoc in a lab by crashing a wacky server
> somewhere... methinks.
>
>
> On Tue, Nov 25, 2008 at 7:42 PM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote:
>   
>> You mean I can SELECT * WHERE {?s ?p ?o } and get a sensible answer?
>> That is exciting.
>>
>> On 25/11/2008 19:25, "Aldo Bucchi" <aldo.bucchi@gmail.com> wrote:
>>
>> Well,
>>
>> The good news is that with OpenLink's new offering, you're pretty much
>> entitled to do all the wrong you want ;)
>> I guess Bezzo's got it figured out...
>>
>> A
>>
>> On Tue, Nov 25, 2008 at 4:19 PM, Hugh Glaser <hg@ecs.soton.ac.uk> wrote:
>>     
>>> As Kingsley said, most sites will provide such things.
>>> If you want a load of SPARQL endpoints to have a go at (but please don't do
>>> too much wrong!),
>>> *.rkbexplorer.com/sparql currently has 35.
>>>
>>> Eg
>>> Try putting SELECT * WHERE { ?s ?p "Sidharth Thakur" } into the box at
>>> http://dblp.rkbexplorer.com/sparql/
>>>
>>> Or
>>> http://dblp.rkbexplorer.com/sparql/?query=SELECT * WHERE { ?s ?p "Sidharth
>>> Thakur" }
>>> (Which actually should be encoded...)
>>>
>>> Have fun.
>>> Hugh
>>>
>>> On 25/11/2008 18:10, "रविंदर ठाकुर   (ravinder thakur)"
>>> <ravinderthakur@gmail.com> wrote:
>>>
>>>       
>>>> i am looking for a service which provide LOD with _any_ protocol. even a low
>>>> level query system like sparql will be awesome!!!
>>>>
>>>>         
>>>       
>>
>> --
>> Aldo Bucchi
>> U N I V R Z
>> Office: +56 2 795 4532
>> Mobile:+56 9 7623 8653
>> skype:aldo.bucchi
>> http://www.univrz.com/
>> http://aldobucchi.com
>>
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>>     
>
>
>
> --
> Aldo Bucchi
> U N I V R Z
> Office: +56 2 795 4532
> Mobile:+56 9 7623 8653
> skype:aldo.bucchi
> http://www.univrz.com/
> http://aldobucchi.com
>
> PRIVILEGED AND CONFIDENTIAL INFORMATION
> This message is only for the use of the individual or entity to which it is
> addressed and may contain information that is privileged and confidential. If
> you are not the intended recipient, please do not distribute or copy this
> communication, by e-mail or otherwise. Instead, please notify us immediately by
> return e-mail.
> INFORMACIÓN PRIVILEGIADA Y CONFIDENCIAL
> Este mensaje está destinado sólo a la persona u organización al cual está
> dirigido y podría contener información privilegiada y confidencial. Si usted no
> es el destinatario, por favor no distribuya ni copie esta comunicación, por
> email o por otra vía. Por el contrario, por favor notifíquenos inmediatamente
> vía e-mail.
>
>   


-- 


Regards,

Kingsley Idehen       Weblog: http://www.openlinksw.com/blog/~kidehen
President & CEO 
OpenLink Software     Web: http://www.openlinksw.com

Received on Wednesday, 26 November 2008 02:12:42 UTC