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OBDA: Query Rewriting or Materialization? In Practice, Both!
Published on Dec 19, 20142474 Views
Given a source relational database, a target OWL ontology and a mapping from the source database to the target ontology, Ontology-Based Data Access (OBDA) concerns answering queries over the target on
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Chapter list
OBDA: Query Rewriting or Materialization? In Practice, Both!00:00
Untitled00:00
Scheme00:12
Ontology-Based Data Access02:18
Backward Chaining – Query Rewriting02:58
Cone03:13
State of the Art: Materialization03:33
State of the Art: Query Rewriting04:15
Hybrid: Backward – Forward Chaining05:09
Hybrid Approach: UltrawrapOBDA05:45
Mappings06:19
RDFS Subclass Inference Rule06:56
Generating Saturated Mappings07:16
Transitivity and SQL Recursion08:18
Transitivity and SQL Recursion08:38
Saturated Mappings08:48
Represent Saturated Mappings as SQL Views09:42
From Saturated Mappings to SQL Views09:59
Runtime: SPARQL Execution10:35
Query Optimization: Materialize Views?11:44
Cost Model12:26
Texas Benchmark13:23
Texas Benchmark13:53
BSBM Extension for Transitivty14:45
Query Plan for Transitivity15:18
Conclusion15:37
Today16:10
Future Work16:15
Thank you!16:26