Transaction Management in Distributed Scheduling Environment for High Performance Database Applications

2003 ◽  
pp. 120-130 ◽  
Author(s):  
Sushant Goel ◽  
Hema Sharda ◽  
David Taniar
Keyword(s):  
High Performance ◽  
Distributed Scheduling ◽  
Transaction Management ◽  
Database Applications

Selective Data Consistency Model in No-SQL Data Store

2017 ◽  
pp. 124-147
Author(s):  
Shraddha Pankaj Phansalkar ◽  
Ajay Dani
Keyword(s):  
High Performance ◽  
Data Consistency ◽  
Web Database ◽  
Database Applications ◽  
Cloud Data ◽  
Critical Data ◽  
Data Object ◽  
Consistency Model ◽  
Data Store ◽  
Data Objects

Contemporary web-applications are deployed on the cloud data-stores for realizing requirements like low latency and high scalability. Although cloud-based database applications exhibit high performance with these features, they compromise on the weaker consistency levels. Rationing the consistency guarantees of an application is a necessity to achieve the augmented metrics of application performance. The proposed work is a paradigm shift from monotonic transaction consistency to selective data consistency in web database applications. The selective data consistency model leverages consistency of critical data-objects and leaves consistency of non-critical data-objects to underlying cloud data-store; it is called selective consistency and it results in better performance of the cloud-based applications. The consistency of the underlying data-object is defined from user-perspective with a user-friendly consistency metric called Consistency Index (CI). The selective data consistency model is implemented on a cloud data-store with OLTP workload and the performance is gauged.

scholarly journals A Temporal Adaptive Access Mechanism for Data Fusion in an IoT Environment

Sensors ◽  
2018 ◽  
Vol 18 (12) ◽  
pp. 4205
Author(s):  
Jiuyun Xu ◽  
Shuang Liu ◽  
Xiaoxuan Lu ◽  
Li Li ◽  
Hongliang Liang ◽  
...  
Keyword(s):  
Data Fusion ◽  
Real Time ◽  
Data Transmission ◽  
High Performance ◽  
Distributed Scheduling ◽  
Time Data ◽  
Delay Performance ◽  
Throughput And Delay ◽  
The Internet Of Things ◽  
Priority Levels

Data fusion in the Internet of Things (IoT) environment demands collecting and processing a wide variety of data with mixed time characteristics, both real-time and non-real-time data. Most of the previous research on data fusion was about the data processing aspect; however, successful data transmission is a prerequisite for high-performance data fusion in IoT. On the other hand, research on data transmissions in IoT mainly focuses on networking without sufficiently considering the special requirements of the upper-layer applications, such as the data fusion process, that are consuming the transmitted data. In this paper, we tackle the problem of data transmission for data fusion in an IoT environment by proposing a distributed scheduling mechanism VD-CSMA in wireless sensor networks, which considers the values for data fusion, as well as the delay constraints of packets when determining their priority levels for transmission. Simulation results have shown that VD-CSMA may enhance both throughput and delay performance of data transmission as compared to the typical scheduling schemes used for data fusion in IoT.

Enhancing Call-Level Interfaces with Thread-Safe Local Memory Structures

2017 ◽  
Vol 27 (09n10) ◽  
pp. 1549-1565
Author(s):  
Óscar Mortágua Pereira ◽  
Rui L. Aguiar
Keyword(s):  
High Performance ◽  
Sql Server ◽  
Proof Of Concept ◽  
Database Applications ◽  
Local Memory ◽  
Performance Requirements ◽  
Nosql Database ◽  
Architectural Tactics ◽  
Database Connectivity ◽  
Computational Resources

Database applications are being increasingly under pressure to respond effectively to ever more demanding performance requirements. Software architects can resort to several well-known architectural tactics to minimize the possibility of coming across with any performance bottleneck. The usage of call-level interfaces (CLIs) is a strategy aimed at reducing the overhead of business components. CLIs are low-level APIs that provide a high-performance environment to execute standard SQL statements on relational and also on some NoSQL database (DB) servers. In spite of these valuable features, CLIs are not thread-safe when distinct threads need to share datasets retrieved through Select statements from databases. Thus, even in situations where two or more threads could share a dataset, there is no other possibility than providing each thread with its own dataset, this way leading to an increased need of computational resources. To overcome this drawback, in this paper we propose a new natively thread-safe architecture. The implementation herein presented is based on a thread-safe updatable local memory structure (LMS) where the data retrieved from databases is kept. A proof of concept based on Java Database Connectivity type 4 (JDBC) for SQL Server 2008 is presented and also a performance assessment.

A Fault Tolerant Decentralized Scheduling in Large Scale Distributed Systems

2010 ◽  
pp. 566-588 ◽  
Author(s):  
Florin Pop
Keyword(s):  
Distributed Systems ◽  
High Performance ◽  
Large Scale ◽  
Fault Tolerant ◽  
Optimal Algorithm ◽  
Distributed Applications ◽  
Distributed Scheduling ◽  
Agent Based ◽  
Decentralized Scheduling ◽  
Optimization Schemes

This chapter presents a fault tolerant framework for the applications scheduling in large scale distributed systems (LSDS). Due to the specific characteristics and requirements of distributed systems, a good scheduling model should be dynamic. More specifically, it should adapt the scheduling decisions to resource state changes, which are commonly captured through monitoring. The scheduler and the monitor are two important middleware pieces that correlate their actions to ensure the high performance execution of distributed applications. The chapter presents and analyses agent based architecture for scheduling in large scale distributed systems. Then the user and resources management are presented. Optimization schemes for scheduling consider the near-optimal algorithm for distributed scheduling. The chapter presents the solution for scheduling optimization. The chapter covers and explains the fault tolerance cases for Grid environments and describes two possible scenarios for scheduling system.

A High Performance Energy Analyzer for Use in Electron Scanning Microscopy

1969 ◽  
Vol 27 ◽  
pp. 14-15
Author(s):  
A. V. Crewe ◽  
M. Isaacson ◽  
D. Johnson
Keyword(s):  
High Performance ◽  
Vertical Plane ◽  
Median Plane ◽  
Electron Gun ◽  
Uniform Field ◽  
Loss Mechanism ◽  
Electron Scanning Microscopy ◽  
Sector Type ◽  
Double Focusing ◽  
Electron Energy Loss

A double focusing magnetic spectrometer has been constructed for use with a field emission electron gun scanning microscope in order to study the electron energy loss mechanism in thin specimens. It is of the uniform field sector type with curved pole pieces. The shape of the pole pieces is determined by requiring that all particles be focused to a point at the image slit (point 1). The resultant shape gives perfect focusing in the median plane (Fig. 1) and first order focusing in the vertical plane (Fig. 2).

Vacuum System to Minimize the Specimen Contamination of High-Performance EM

1977 ◽  
Vol 35 ◽  
pp. 68-69
Author(s):  
N. Yoshimura ◽  
K. Shirota ◽  
T. Etoh
Keyword(s):  
Electron Microscope ◽  
High Speed ◽  
High Performance ◽  
High Vacuum ◽  
Vacuum System ◽  
Pump System ◽  
Pumping System ◽  
Diffusion Pump ◽  
Almost All ◽  
Cascade Type

One of the most important requirements for a high-performance EM, especially an analytical EM using a fine beam probe, is to prevent specimen contamination by providing a clean high vacuum in the vicinity of the specimen. However, in almost all commercial EMs, the pressure in the vicinity of the specimen under observation is usually more than ten times higher than the pressure measured at the punping line. The EM column inevitably requires the use of greased Viton O-rings for fine movement, and specimens and films need to be exchanged frequently and several attachments may also be exchanged. For these reasons, a high speed pumping system, as well as a clean vacuum system, is now required. A newly developed electron microscope, the JEM-100CX features clean high vacuum in the vicinity of the specimen, realized by the use of a CASCADE type diffusion pump system which has been essentially improved over its predeces- sorD employed on the JEM-100C.

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