منابع مشابه
Exploiting Schemas in Data Synchronization
Increased reliance on optimistic data replication has led to burgeoning interest in tools and frameworks for synchronizing disconnected updates to replicated data. But good data synchronizers are challenging both to specify and to build. We have implemented a generic synchronization framework, called Harmony, that can be used to build statebased synchronizers for a wide variety of tree-structur...
متن کاملExploiting Delayed Synchronization Arrivals in Light-Weight Data Parallelism
SPMD Single Program Multiple Data models and other traditional models of data parallelism provide parallelism at the processor level Barrier synchroniza tion is de ned at the level of processors where when a processor arrives at the barrier point early and waits for others to arrive no other useful work is done on that processor Program restructuring is one way of min imizing such latencies How...
متن کاملExploiting Emergent Schemas to Make RDF Systems More Efficient
We build on our earlier finding that more than 95% of the triples in actual RDF triple graphs have a remarkably tabular structure, whose schema does not necessarily follow from explicit metadata such as ontologies, but for which an RDF store can automatically derive by looking at the data using so-called “emergent schema” detection techniques. In this paper we investigate how computers and in p...
متن کاملLearning Mappings between Data Schemas
To build a data-integration system, the application designer must specify a mediated schema and supply the descriptions of data sources. A source description contains a source schema that describes the content of the source, and a mapping between the corresponding elements of the source schema and the mediated schema. Manually constructing these mappings is both laborintensive and error-prone, ...
متن کاملLocal constraint in semistructured data schemas
Recently, there have been several proposals of formalisms for modeling semistructured data, which is data that is neither raw, nor strictly typed as in conventional database systems. Semistructured data models are graph-based models, where graphs are used to represent both databases and schemas. We study the basic problem of schema subsumption, which amounts to check whether all databases confo...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Journal of Computer and System Sciences
سال: 2007
ISSN: 0022-0000
DOI: 10.1016/j.jcss.2006.10.024