Topic
Data access
About: Data access is a research topic. Over the lifetime, 13141 publications have been published within this topic receiving 172859 citations. The topic is also known as: Data access.
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11 Jun 2007TL;DR: This paper describes the key aspects of the ADO.NET Entity Framework, the overall system architecture, and the underlying technologies that significantly reduces the impedance mismatch for applications and data-centric services.
Abstract: Traditional client-server applications relegate query and persistence operations on their data to database systems. The database system operates on data in the form of rows and tables, while the application operates on data in terms of higher-level programming language constructs (classes, structures etc.). The impedance mismatch in the data manipulation services between the application and the database tier was problematic even in traditional systems. With the advent of service-oriented architectures (SOA), application servers and multi-tier applications, the need for data access and manipulation services that are well-integrated with programming environments and can operate in any tier has increased tremendously. Microsoft's ADO.NET Entity Framework is a platform for programming against data that raises the level of abstraction from the relational level to the conceptual (entity) level, and thereby significantly reduces the impedance mismatch for applications and data-centric services. This paper describes the key aspects of the Entity Framework, the overall system architecture, and the underlying technologies.
82 citations
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26 Feb 2004
TL;DR: An apparatus, system, and method for data access management on a storage device connected to a storage area network is described in this paper, where the storage server also includes a storage manager that is configured to manage data access by the storage agent to the requested storage device.
Abstract: An apparatus, system, and method are disclosed for data access management on a storage device connected to a storage area network. A client includes network connections to a first and second network, where the second network comprises a storage area network (SAN). The client also includes a storage management client and a storage agent. The storage agent is configured to minimize the amount of metadata processing that occurs on the client by sending the metadata or a copy thereof to a storage server to be stored in a centralized metadata database. The storage server also includes a storage manager that is configured to manage data access by the storage agent to the requested storage device.
82 citations
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10 Jan 2007
TL;DR: In this article, a method and apparatus for storage of data, data is stored The stored data is checked periodically and/or on data access, for development of a fault in the stored data If a fault is detected, at least one of: (i) increased protection and (ii) increased error correction is applied to at least some of the remaining fault-free data
Abstract: In a method and apparatus for storage of data, data is stored The stored data is checked, for example periodically and/or on data access, for development of a fault in the stored data If a fault is detected, at least one of: (i) increased protection and (ii) increased error correction is applied to at least some of the remaining fault-free data
82 citations
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TL;DR: An easy-to-use yet powerful Web API is described, enabling fast and convenient access to MSI data, metadata, and derived analysis results stored remotely to facilitate high-performance data analysis and enable implementation of Web based data sharing, visualization, and analysis.
Abstract: Mass spectrometry imaging (MSI) enables researchers to directly probe endogenous molecules directly within the architecture of the biological matrix. Unfortunately, efficient access, management, and analysis of the data generated by MSI approaches remain major challenges to this rapidly developing field. Despite the availability of numerous dedicated file formats and software packages, it is a widely held viewpoint that the biggest challenge is simply opening, sharing, and analyzing a file without loss of information. Here we present OpenMSI, a software framework and platform that addresses these challenges via an advanced, high-performance, extensible file format and Web API for remote data access (http://openmsi.nersc.gov). The OpenMSI file format supports storage of raw MSI data, metadata, and derived analyses in a single, self-describing format based on HDF5 and is supported by a large range of analysis software (e.g., Matlab and R) and programming languages (e.g., C++, Fortran, and Python). Careful optimization of the storage layout of MSI data sets using chunking, compression, and data replication accelerates common, selective data access operations while minimizing data storage requirements and are critical enablers of rapid data I/O. The OpenMSI file format has shown to provide >2000-fold improvement for image access operations, enabling spectrum and image retrieval in less than 0.3 s across the Internet even for 50 GB MSI data sets. To make remote high-performance compute resources accessible for analysis and to facilitate data sharing and collaboration, we describe an easy-to-use yet powerful Web API, enabling fast and convenient access to MSI data, metadata, and derived analysis results stored remotely to facilitate high-performance data analysis and enable implementation of Web based data sharing, visualization, and analysis.
81 citations
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28 Jun 2002TL;DR: In this article, a schema-based notification/alert service for providing schemabased notifications is proposed, which includes a schema that defines rules and a structure for sending, handling and/or receiving notifications and alerts.
Abstract: A schema-based notification/alert service for providing schema-based notifications The notification service includes a schema that defines rules and a structure for sending, handling and/or receiving notifications and alerts Senders and receivers manipulate (eg, read or write) data in the logical document by data access requests through defined methods In one implementation, the notification schemas are arranged as XML documents, and the services provide methods that control access to the data based on the requesting user's identification, defined role and scope for that role Extensibility is defined into the schema An architecture is provided to intelligently route alerts from senders to client user agent recipients
81 citations