Comparing q-ary relations on a set O of elementary objects is one of the most fundamental problems of classiication and combinatorial data analysis. In this paper the speciic comparison task that involves classiication tree structures (binary or not) is considered in this context. Two mathematical representations are proposed. One is deened in terms of a weighted binary relation; the second use...

We argue that there is a need for Multi-Tenant Customizable OLTP systems. Such systems need a Multi-Tenant Customizable Database (MTC-DB) as a backing. To stimulate the development of such databases, we propose the benchmark MTCB. Benchmarks for OLTP exist and multi-tenant benchmarks exist, but no MTC-DB benchmark exists that accounts for customizability. We formulate seven requirements for the...

In the last decade, many business applications have moved into the cloud. In particular, the “database-as-a-service” paradigm has become mainstream. While existing multi-tenant data management systems focus on single-tenant query processing, we believe that it is time to rethink how queries can be processed across multiple tenants in such a way that we do not only gain more valuable insights, b...

Factors influencing choice of share or cash rental leases for cropland are examined using a 1996 dataset containing 1071 lease contracts in Nebraska and in South Dakota. Logistic regression results indicate tenant's age, capital position, and relationship with landlord were more important than leased land use or crop management variables.

Provenance-based Access Control (PBAC) has recently risen as an effective access control approach that can utilize readily provided history information of underlying systems to enhance various aspects of access control in a computing environment. The adoption of PBAC capabilities to the authorization engine of a multi-tenant cloud Infrastructure-as-a-Service (IaaS) such as OpenStack can enhance...

Cloud computing promotes economies of scale by sharing software and hardware resources across multiple tenants. To date, there has been relatively little research on how MDE can best support multi-tenant cloud applications, where there is a need to separate the logic and data of multiple tenants. In this position paper, we sketch out five key research opportunities for applying MDE to multi-ten...

Today’s cloud networks are shared among many tenants. Bandwidth guarantees and work conservation are two key properties to ensure predictable performance for tenant applications and high network utilization for providers. Despite significant efforts, very little prior work can really achieve both properties simultaneously even some of them claimed so. In this paper, we present QShare, a compreh...

In order to serve a lot of different customers in a SaaS environment, software vendors have to comply to a range of different varying requirements in their software product. Because of these varying requirements and the large number of customers, a variable multi-tenant solution is needed to achieve this goal. This paper gives a pragmatic approach to the concepts of multi-tenancy and variabilit...