This paper proposes a high level maturity in SaaS applications based on virtualization technologies, in which the hardware virtualization focuses on providing the flexible on-demand hosting environment, the application virtualization used to meet the scalable application deployment requirements and data virtualization solves data integration and unified data access problems to ensure multi-tena...

Cloud computing improves utilization and flexibility in allocating computing resources while reducing the infrastructural costs. However, in many cases cloud technology is still proprietary and tainted by security issues rooted in the multi-user and hybrid cloud environment. A lack of secure connectivity in a hybrid cloud environment hinders the adaptation of clouds by scientific communities th...

An Overview of DDoS Attacks in Cloud Environment Nagaraju kilari Department of Computer Science, Garden City College, Bangalore, Karnataka, India. Email: [email protected] Dr. R. Sridaran Marwadi Education Foundation's Group of Institutions, Rajkot, Gujarat, India. Email: [email protected] ----------------------------------------------------------------------ABSTRACT-...

Simulation of parallel database machines was used in many database research projects during the 1990ies. One of the main reasons why simulation approaches were popular in that time was the fact that clusters with hundreds of nodes were not as readily available for experimentation as it is the case today. At the same time, the simulation models underlying these systems were fairly complex since ...

Reducing the total cost of ownership (TCO) and meeting the service level agreements (SLA) of a computing service or application in the Cloud remains a challenge. The traditional method of meeting SLA is to size production systems based on expected peak workloads, thus this leads to very low compute resource utilization. Our experience shows typical average utilization rates of 35 40%, topped on...

In a multi-tenant data center, nodes and links of tenants’ virtual networks (VNs) share a single component of the physical substrate network (SN). The failure of a single SN component can thereby cause the simultaneous failures of multiple nodes and links in a single VN; this complex of failures must significantly disrupt the services offered on the VN. In the present paper, we clarify how the ...

Typical pricing models for IaaS cloud providers are slotted, using hour and month as time units for metering and charging resource usage. Such models lead to financial loss as applications may release resources much earlier than the end of the last allocated time slot, leaving the cost paid for the rest of the time unit wasted. This problem can be minimized for multi-tenant environments by mana...

Database benchmarks have been used for decades to load test systems and to compare systems or system configurations with each other. However, their methods and assumptions are hardly suitable for multi-tenant cloud database services. Those systems have to provide both performance isolation of a lot of tenants with dynamic workloads and cloud computing features like scalability, elasticity, and ...

When users upload their private data to the cloud, they lose control of stored in cloud server. If system cannot provide an effective security mechanism protect data, consequent leakage issue will hinder development computing. Conventional access and encryption technologies effectively propagation tenant system. The mandatory one-way information flow model is limited by complexity environment, ...

Multi-tenant main memory index is an important tool to accelerate data access to software as a service. Establishing main memory indexes for each tenant occupies lots of memory space and results in performance bottleneck. The data schemas and access patterns of different tenants are similar, which provides the conditions for tenants storing their index entries with shared structure in main memo...