Database Systems for Adanced Applications: 16th by Lei Chen (auth.), Jianliang Xu, Ge Yu, Shuigeng Zhou, Rainer

By Lei Chen (auth.), Jianliang Xu, Ge Yu, Shuigeng Zhou, Rainer Unland (eds.)

This ebook constitutes the workshop complaints of the sixteenth overseas convention on Database structures for complicated purposes, DASFAA 2011, held in Hong Kong, China, in April 2011.
The quantity comprises six workshops, each one targeting particular examine concerns that give a contribution to the most subject matters of the DASFAA convention: the 1st overseas Workshop on Graph-structured info Bases (GDB 2011); the 1st foreign Workshop on Spatial info Modeling, administration and Mining (SIM3 2011); the overseas Workshop on Flash-based Database structures (FlashDB 2011); the second one foreign Workshop on Social Networks and Social Media Mining on the net (SNSMW 2011); the 1st foreign Workshop on facts administration for rising community Infrastructures (DaMEN 2011); and the Fourth foreign Workshop on information caliber in Integration structures (DQIS 2011).

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Additional info for Database Systems for Adanced Applications: 16th International Conference, DASFAA 2011, International Workshops: GDB, SIM3, FlashDB, SNSMW, DaMEN, DQIS, Hong Kong, China, April 22-25, 2011. Proceedings

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GJH *UDSK $%! * $&! * $(! * $)! * $*! * %(! * *UDSK * * * * (GJH $%! $&! $(! %(! (GJH *UDSK $%! * $&! * $(! * %(! * Reduce Output )LOH (GJH *UDSK6HW $%! * * *  $)! * $*! * %'! * %(! * *  )LOH (GJH *UDSK6HW $&! * * *  $'! * $(! * *  Fig. 2. Building the first-level index with identical EdgeLabel are aggregated together, and the Reduce function generates an EdgeLabel / GraphSet pair where the GraphSet consists of GraphNos with similar EdgeLabel.

It is caused by the need to store k − 1 partition pointers in external edges. Although O(k 2 ) partition ids may need to be stored per unreplicated edge, it turns out that this does not dominate storage requirements when partition ids are small compared to node/edge ids and payload. For k ≤ 6, the overhead is ≤ k + 1 for a graph with 1012 elements and a constant degree in the range 20-110. message cost factor of replication Number of Messages. FFS eliminates α · h remote hops from a walk that requires h hops when no replication is used.

Together with knowledge about the partitions currently searched by FFS, this is sufficient to simulate which other replicas cannot execute the next step locally. Inversely a partition which cannot continue locally knows if other partitions can. In this way, partitions execute the query speculatively for as long as they can. Finally, when none can continue, all remaining partitions contain a maximum local walk and a follow-up broadcast step cannot be delayed any longer. In that case, it suffices to uniquely select a single winning partition deterministically.

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