Incremental file reorganization schemes

Issued as Final project report, Project no. G-36-66

Towards a Holistic Integration of Spreadsheets with Databases: A Scalable Storage Engine for Presentational Data Management

Spreadsheet software is the tool of choice for interactive ad-hoc data management, with adoption by billions of users. However, spreadsheets are not scalable, unlike database systems. On the other hand, database systems, while highly scalable, do not support interactivity as a first-class primitive. We are developing DataSpread, to holistically integrate spreadsheets as a front-end interface with databases as a back-end datastore, providing scalability to spreadsheets, and interactivity to databases, an integration we term presentational data management (PDM). In this paper, we make a first step towards this vision: developing a storage engine for PDM, studying how to flexibly represent spreadsheet data within a database and how to support and maintain access by position. We first conduct an extensive survey of spreadsheet use to motivate our functional requirements for a storage engine for PDM. We develop a natural set of mechanisms for flexibly representing spreadsheet data and demonstrate that identifying the optimal representation is NP-Hard; however, we develop an efficient approach to identify the optimal representation from an important and intuitive subclass of representations. We extend our mechanisms with positional access mechanisms that don't suffer from cascading update issues, leading to constant time access and modification performance. We evaluate these representations on a workload of typical spreadsheets and spreadsheet operations, providing up to 20% reduction in storage, and up to 50% reduction in formula evaluation time

Data partitioning and load balancing in parallel disk systems

Parallel disk systems provide opportunities for exploiting I/O parallelism in two possible ways, namely via inter-request and intra-request parallelism. In this paper we discuss the main issues in performance tuning of such systems, namely striping and load balancing, and show their relationship to response time and throughput. We outline the main components of an intelligent file system that optimizes striping by taking into account the requirements of the applications, and performs load balancing by judicious file allocation and dynamic redistributions of the data when access patterns change. Our system uses simple but effective heuristics that incur only little overhead. We present performance experiments based on synthetic workloads and real-life traces

Query Extraction Using Filtering Technique over the Stored Data in the Database

Many variety of users approaching server to perform their continuous queries which incorporates the knowledge desires and obtain notified at anytime supported the question that has been printed. To makes this task with efficiency servers ought to keep classification methodology that compares the knowledge in information. we tend to gift a unique question classification and reorganization formula that supports mathematician IF and that we determine totally different reorganization choices for the indexes and demonstrate the importance of question insertion order within the construction of the classification structure. we tend to through an experiment judge completely different reorganization methods and showcase their impact in filtering potency victimization 2 different real-world datasets and each artificial and real question sets. we tend to planned a CF primarily based algorithms for economical filtering performance. It doesn't base on the insertion of queries in information

Public sector management issues in structural adjustment lending

This paper reviews the Bank's experience in implementing public sector management reforms through structural adjustment lending. The study focuses on those institutional aspects of adjustment that deal with"macro-management"issues related to improvements in the management performance of core central government institutions and to systemic changes in public adminstrations. The paper reached the following broad conclusions; (a) public sector management components of SALs progressed unevenly and outcomes varied with diverse political, administrative and economic conditions; (b) reforms for which routinized methodologies and systems were introduced and those that could be linked to actionable steps were more likely to be sustained over time; (c) short time horizons of SALs posed severe constraints on the effective implementation of public sector management reforms; and (d) reforms through SALs are more successful when supported by specific technical assistance projects. It also concluded that: (e) the haste of SAL schedules and the lack of dynamism and focus of traditional technical assistance argues for the creation of a new lending instrument; (f) country economic and sector work is crucial to successful reforms undertaken through SALs; and (g) monitoring and supervision of institutional components of SALs needs to be systemized and the quality of documentation improved.Public Sector Economics&Finance,National Governance,Banks&Banking Reform,Health Monitoring&Evaluation,Economic Policy, Institutions and Governance