عنوان فارسی مقاله: SQMD: معماری برای مقیاس پذیر، سیستم توزیع پایگاه داده های ساخته شده بر روی سرور مجازی سرور


عنوان انگلیسی مقاله:

SQMD: Architecture for Scalable, Distributed Database System built on Virtual Private Servers




 

فهرست مطالب

SQMD: Architecture for Scalable, Distributed Database System built on Virtual Private Servers
Introduction
Distributed database system built on virtual private servers
Scalable distributed database system architecture
Example query and Total number of hits for varying R (distance cutoff)
Total latency = Transit cost (Tclient2ws) + Web service cost (Tws2db)
Mean query response time in a centralized (not fragmented) database
Performance analysis
Speedup
Mean query processing timein each cluster (R = 0.5)
Mean query response time
Summary and Future work



بخشی از مقاله

Distributed database system built on virtual private servers
Database system is composed of three tiers
web service (WS) client (front-end)
web service and message service system (middleware)
agents and a collection of databases (back-end)
Distributed database system allows WS clients to access data from databases distributed over virtual private servers.
Databases are distributed over multiple virtual private servers by fragmenting data using two different methods:
data clustering
horizontal (or equal) partitioning
The distributed database system is a network of two or more PostgreSQL databases that reside on one or more virtual private servers.
Lab uses 8 virtual private servers over one physical machine with OpenVZ virtualization technology
WS client can simultaneously access (or query) the data in several databases in a single distributed environment.
SQMD (Single Query Multiple Database) mechanism which transmits a single query that synchronously operates on multiple databases, using publish/subscribe paradigm.



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