バージョン 8 から バージョン 9 における更新: ADERIS

更新日時:

2014/12/25 16:57:21 (11 年 前)

更新者:

wu

コメント:

--

ADERIS

@@ +1 @@
+
+
+== ADERIS ==
+
 * source: sparql-aderis - Revision 143: /trunk
 
@@ -18 +22 @@
 
 ||Query\time(ms) ||time 1 || time 2 || time 3 ||time 4||time 5 ||
-||case1 ||      ０||０||0||０||    ０||
+||case1 ||      27010||０||0||０||        ０||
+
+
+
+* Analysis:
+1. When doing queries, ADERIS firstly queries each data sources using SPARQL to find out the
+  number of distinct predicate values(Data about subjects/objects  not retrieved.)
+select distinct ?p where { ?s ?p ?o };
+select count(?p) where { ?s ?p ?o };
+
+potential consequences:
+Without using caches and any metadata information pre-fetched, the system query each endpoint in real time,
+which could take a long time, especially, when the number of endpoints increases.
+
+2.
+
+
+
+
+
+