Flexibility in Data Management

With the ongoing expansion of information technology, new fields of application requiring data management emerge virtually every day. In our knowledge culture increasing amounts of data and work force organized in more creativity-oriented ways also radically change traditional fields of application and question established assumptions about data management. For instance, investigative analytics and agile software development move towards a very agile and flexible handling of data. As the primary facilitators of data management, database systems have to reflect and support these developments. However, traditional database management technology, in particular relational database systems, is built on assumptions of relatively stable application domains. The need to model all data up front in a prescriptive database schema earned relational database management systems the reputation among developers of being inflexible, dated, and cumbersome to work with. Nevertheless, relational systems still dominate the database market. They are a proven, standardized, and interoperable technology, well-known in IT departments with a work force of experienced and trained developers and administrators. This thesis aims at resolving the growing contradiction between the popularity and omnipresence of relational systems in companies and their increasingly bad reputation among developers. It adapts relational database technology towards more agility and flexibility. We envision a descriptive schema-comes-second relational database system, which is entity-oriented instead of schema-oriented; descriptive rather than prescriptive. The thesis provides four main contributions: (1)~a flexible relational data model, which frees relational data management from having a prescriptive schema; (2)~autonomous physical entity domains, which partition self-descriptive data according to their schema properties for better query performance; (3)~a freely adjustable storage engine, which allows adapting the physical data layout used to properties of the data and of the workload; and (4)~a self-managed indexing infrastructure, which autonomously collects and adapts index information under the presence of dynamic workloads and evolving schemas. The flexible relational data model is the thesis\' central contribution. It describes the functional appearance of the descriptive schema-comes-second relational database system. The other three contributions improve components in the architecture of database management systems to increase the query performance and the manageability of descriptive schema-comes-second relational database systems. We are confident that these four contributions can help paving the way to a more flexible future for relational database management technology

Flexibility in Data Management

With the ongoing expansion of information technology, new fields of application requiring data management emerge virtually every day. In our knowledge culture increasing amounts of data and work force organized in more creativity-oriented ways also radically change traditional fields of application and question established assumptions about data management. For instance, investigative analytics and agile software development move towards a very agile and flexible handling of data. As the primary facilitators of data management, database systems have to reflect and support these developments. However, traditional database management technology, in particular relational database systems, is built on assumptions of relatively stable application domains. The need to model all data up front in a prescriptive database schema earned relational database management systems the reputation among developers of being inflexible, dated, and cumbersome to work with. Nevertheless, relational systems still dominate the database market. They are a proven, standardized, and interoperable technology, well-known in IT departments with a work force of experienced and trained developers and administrators. This thesis aims at resolving the growing contradiction between the popularity and omnipresence of relational systems in companies and their increasingly bad reputation among developers. It adapts relational database technology towards more agility and flexibility. We envision a descriptive schema-comes-second relational database system, which is entity-oriented instead of schema-oriented; descriptive rather than prescriptive. The thesis provides four main contributions: (1)~a flexible relational data model, which frees relational data management from having a prescriptive schema; (2)~autonomous physical entity domains, which partition self-descriptive data according to their schema properties for better query performance; (3)~a freely adjustable storage engine, which allows adapting the physical data layout used to properties of the data and of the workload; and (4)~a self-managed indexing infrastructure, which autonomously collects and adapts index information under the presence of dynamic workloads and evolving schemas. The flexible relational data model is the thesis\' central contribution. It describes the functional appearance of the descriptive schema-comes-second relational database system. The other three contributions improve components in the architecture of database management systems to increase the query performance and the manageability of descriptive schema-comes-second relational database systems. We are confident that these four contributions can help paving the way to a more flexible future for relational database management technology

Fourth NASA Goddard Conference on Mass Storage Systems and Technologies

This report contains copies of all those technical papers received in time for publication just prior to the Fourth Goddard Conference on Mass Storage and Technologies, held March 28-30, 1995, at the University of Maryland, University College Conference Center, in College Park, Maryland. This series of conferences continues to serve as a unique medium for the exchange of information on topics relating to the ingestion and management of substantial amounts of data and the attendant problems involved. This year's discussion topics include new storage technology, stability of recorded media, performance studies, storage system solutions, the National Information infrastructure (Infobahn), the future for storage technology, and lessons learned from various projects. There also will be an update on the IEEE Mass Storage System Reference Model Version 5, on which the final vote was taken in July 1994

Extending functional databases for use in text-intensive applications

This thesis continues research exploring the benefits of using functional databases based around the functional data model for advanced database applications-particularly those supporting investigative systems. This is a growing generic application domain covering areas such as criminal and military intelligence, which are characterised by significant data complexity, large data sets and the need for high performance, interactive use. An experimental functional database language was developed to provide the requisite semantic richness. However, heavy use in a practical context has shown that language extensions and implementation improvements are required-especially in the crucial areas of string matching and graph traversal. In addition, an implementation on multiprocessor, parallel architectures is essential to meet the performance needs arising from existing and projected database sizes in the chosen application area. [Continues.

Block shifting layout for efficient and robust large declustered storage systems

International audienc

Origins of sedentism: possible roles of ideology and shamanism in the transition

Recognising causal links between religious practices and socio-political structures, it is argued that the transition to settled life during the Neolithic was the product of social and political changes brought about by the institutionalisation and manipulation of ideology. These were employed by ambitious, influential individuals using sedentism as a strategy to achieve social control and the power, status and appropriated wealth (labour and resources) this engendered. A key factor in this was the materialisation of ideology, making visible the supernatural. Exploration of the ideopolitical nature of cultural elements — social, economic, and political — integral to the transition among Southwest Asian societies who experienced the profound changes involved, identified a nexus between increasing intensity of shamanistically manipulated ideology and progressive decrease in mobility. Furthermore, it reinforced the pivotal role played by shamanism in the transitional process, and that it was facilitated and maintained by the generation of ongoing socio-ideological stress. Emergence of personal and group individualism during the transition, but particularly in the latter part, saw competition in both hierarchical and heterarchical contexts for social control. In the course of this, shamanism was also employed by other influential individuals and became hybridised in the form of the quasi-divine shaman-priest-leaders operating ceremonial centres from which they dominated the activities of regional populations. A model derived from the archaeology of selected sites in Southwest Asia is presented that views the transition as a three-phase process reflecting the emergence and progressive intensification of a collective psychology, this manifest in new ideology, the growing importance of ‘place’, and individualism and social complexity not previously experienced. Also apparent is that initiation of the transition was associated with a new ideology and driven by shamanism, with the influence of the various agents involved becoming increasingly evident in a range of interrelated behavioural trends and developments. Each phase of the model sees ideology taken intentionally and necessarily to a higher level of intensity, providing a longer-term perspective on the relationship between ideology and economy. Evidence from the British Isles 5000-2000 calBC used for model validation confirmed that where ideology is evident in the archaeological record shamanism was influential, and emphasised the ideological context of the settlement foci and controlling agencies. Behavioural trends become more developed throughout, despite site context and location. While variation was apparent among the subregions in the extent to which a more settled way of life achieved, the overall effect in each was to bring dispersed communities together long-term, ideopolitically controlled in geographically confined contexts by site or wider location. People were being aggregated more regularly and co-operatively; this clearly facilitated by ideology. The British evidence also indicated that settled life did not necessarily equate precisely with the criteria of settled life, i.e., living permanently in durable structures on one site; rather, there was flexibility in the way these might be exhibited. Furthermore, full-time sedentism was shown to be preceded by permanent ceremonial structures and their ideological context