tag:blogger.com,1999:blog-3465716704098863819.post7861241199620721903..comments2021-01-24T00:55:37.049-08:00Comments on Programming The Web: RDF FederationJames Leighhttp://www.blogger.com/profile/14146095505004628863noreply@blogger.comBlogger7125tag:blogger.com,1999:blog-3465716704098863819.post-47527304896818846792010-05-14T18:49:34.957-07:002010-05-14T18:49:34.957-07:00Federation in RDBMS is not effective because of th...Federation in RDBMS is not effective because of the data integrity constrains. RDBMS relies on pessimistic concurrency control, which requires centralization. Federating multiple data sources requires an optimistic concurrency control to scale effectively.<br /><br />Take a look at <a href="http://jamesrdf.blogspot.com/2009/03/eight-isolation-levels-every-web.html" rel="nofollow">Eight Isolation Levels Every Web Developer Should Know</a> for more information on concurrency controls.<br /><br />Partitioning your data effectively is a skill just as designing an effective table schema. Both can have significant impact on performance and scalability.<br /><br />A smart, well informed, query optimizer is essential for effective query processing. However, many distribution problems can be solved with minimal remote cross joins.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-79785885458912069812010-05-13T13:09:14.953-07:002010-05-13T13:09:14.953-07:00I meant "the guys in the relation DBMS do *no...I meant "the guys in the relation DBMS do *not* user it too much" - sorry <br /><br />Atanas KiryakovNasohttps://www.blogger.com/profile/16646688261956392586noreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-22977136909666993102010-05-13T09:18:42.546-07:002010-05-13T09:18:42.546-07:00Dear James,
federation through data/index partiti...Dear James,<br /><br />federation through data/index partitioning sounds as the universal solution for all sorts of problems in DBMS. Still, the guys in the relational DBMS do use it too much. Any guess why? Any thoughts what is the impact of the speed of query evaluation? Any ideas how to get around the so-called "remote join" problem?<br /><br />Cheers,<br />Atanas KiryakovNasohttps://www.blogger.com/profile/16646688261956392586noreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-67945109390411711292010-04-10T07:53:15.441-07:002010-04-10T07:53:15.441-07:00You don't have to use the object-mapper or ser...You don't have to use the object-mapper or server of AliBaba to use the federation. Just include the jar and follow the documentation.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-69502927550621399002010-04-06T11:25:07.030-07:002010-04-06T11:25:07.030-07:00Thanks for the answer! Is it possible to use the R...Thanks for the answer! Is it possible to use the RDF Federation Sail with Sesame 2.3 without using AliBaba?Daniela Kolarovahttps://www.blogger.com/profile/17857967212365217666noreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-74269315983219276202010-04-02T08:20:34.932-07:002010-04-02T08:20:34.932-07:00Hi Daniela,
Sesame 3.0 is suspended until further...Hi Daniela,<br /><br />Sesame 3.0 is suspended until further development is made in the SPARQL 1.1 Working Group. However, the federation has been back ported to Sesame 2.3 and is currently shipping with AliBaba 2.0-alpha4.Anonymousnoreply@blogger.comtag:blogger.com,1999:blog-3465716704098863819.post-88239559326400161412010-04-01T08:00:59.192-07:002010-04-01T08:00:59.192-07:00Federation sounds like a big step further towards ...Federation sounds like a big step further towards structured data distribution in the Internet. When will Sesame 3.0 be officially released?Daniela Kolarovahttps://www.blogger.com/profile/17857967212365217666noreply@blogger.com