Cooper, B., Crespo, A., and GarciaMolina, H. Implementing a Reliable Digital Object Archive. In Fourth European Conference on Digial Libraries (ECDL 2000.  Home/Search   Document Details and Download   Summary   Related Articles   Check

....is simple [15] we are not aware of a system design that actually takes advantage of it and works out the details, incorporating both time stamping of signatures and timed storage of old veri cation keys. The secure archival storage work we are aware of (for example, OceanStore [18] Cooper et al. [8], SFS RO [12] addresses mostly issues of data survivability, format redundancy, con dentiality on thewire or on disk, and authentication authorization of clients and servers. Rosenthal et al. 26] describe a system for preservation of online scienti c journals against malicious destruction. The ....

Cooper, B., Crespo, A., and GarciaMolina, H. Implementing a Reliable Digital Object Archive. In Fourth European Conference on Digial Libraries (ECDL

....26] employ the distributed object technology to cope with interoperability among heterogeneous resources. The experiences in designing and implementing digital libraries including the archival repository architecture, user interface, and cross access mechanism, etc. are extensively described in [16, 8, 7, 3]. 5.2 Some Distinguished Features Compared to the traditional expert like knowledge based information systems, the DL systems enhanced with knowledge elements have the following distinguished features. 14 Functions. Knowledge based systems simulate human behavior by making deductions using the ....

B. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. Technical report, Standford University, 2000.

....semistructured data and non standard data formats are conducted to enable the integration of heterogeneous resources [DBJ99, MW99, BDT99] The experiences in constructing DL archival repositories, user interfaces, and cross access mechanisms, etc. are extensively described in [HP00, CGM99, CCGM00, HBOS96, Hou95, PW97, Liu99, CMFH00, Kan98, BSH97, BL97] 1.2 The Inadequacy Despite lots of fruitful work in the digital library area, from the standpoint of satisfying human s information needs, the current DL systems suffer from the following two shortcomings. Inadequate High Level Cognition ....

B. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. Technical report, Standford University, 2000.

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B. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. In Proc. European Conf. on Digital Libraries (ECDL), Sept. 2000.

....Charles Darwin s On the Origin of Species at multiple libraries all over the world, a failure at one library does not mean that the material is lost forever. Several systems that embody this replication concept for digital materials have been built, including OceanStore [13] LOCKSS [23] and SAV [5, 6]. In order for this approach to work, multiple libraries must cooperate to provide storage, searching and distribution for each digital item. However, the very property that protects digital materials, namely storing copies at multiple distributed, autonomous sites, makes the preservation system ....

B. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. In Proc. European Conf. on Digital Libraries (ECDL), 2000.

....all sites are homogeneous then a software bug or security vulnerability that afflicts one site would afflict all sites. Because of these advantages, several systems have been built on the model of community based redundancy, including Archival Intermemory [6] OceanStore [17] LOCKSS [3] and SAV [9]. A central question in community based redundancy systems revolves around the contribution and allocation of resources. Peers must determine how 1 many resources they can reasonably expect from the community, and howmany resources they themselves must contribute. Moreover, because there is no ....

B. F. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. In Proc. European Conf. on Digital Libraries (ECDL),Sept.

....materials should be made at different, autonomous archives to protect data from organization wide failures such as bankruptcy. Moreover, cooperating archives can spread the cost of preservation over several institutions, while ensuring that all archives achieve high reliability. Several projects [4, 12, 24, 10] have proposed making mutiple copies of data collections, and then repeatedly checking This material is based upon work supported by the National Science Foundation under Award 9811992. Permission to make digital or hard copies of all or part of this work for personal or classroom use is granted ....

....remote sites for storing copies of archived collections. Once trades have been made and collections are distributed, archivists can use other existing systems to detect and recover from failures, enforce security, manage metadata, and so on. Other projects have examined these issues in more detail [4, 22, 17, 23, 19]. It is also possible to enhance our basic techniques to deal with digital objects which change over time, or trades with sites that provide a specialized service (such as storage for a fee) In ongoing work, we are extending our model to provide negotiation for access services (such as search) in ....

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Brian Cooper, Arturo Crespo, and Hector Garcia-Molina. Implementing a reliable digital object archive. In Proc. ECDL, pages 128--143, September

....goal is to ensure reliability while preserving site autonomy. Such a community based replication system necessarily makes different decisions than a system that can centralize control in one place, or that places data close to users in order to improve efficiency. Several systems, including SAV [7] and LOCKSS [24, 3] can be classified as community based replication systems. This paper discusses how such systems can trade data to find the most reliable replication. The concepts behind auctions, biddingand market oriented systems have been well studied by economists 2 and computer ....

B. Cooper, A. Crespo, and H. Garcia-Molina. Implementing a reliable digital object archive. In Proc. European Conf. on Digital Libraries (ECDL), Sept.

....studied. 2 Related Work Several papers discuss the design of a P2P system for a specific application without a detailed performance analysis. For example, reference [1] describes the Freenet project which was designed to provide anonymity to users and to adapt to user behavior. Reference [12] describes a system that uses the P2P model to address the problems of survivability and availability of digital information. Reference [15] describes a replicated file system based on P2P file exchanges. Adar and Huberman conducted a study in [10] on user query behavior in Gnutella, a pure P2P ....

Brian Cooper, Arturo Crespo, Hector Garcia-Molina. Implementing a reliable digital object archive. 4th European Conf. on Digital Libraries, September 2000.

....site in a reliable database system. If the web site authoring and management software does not provide such archiving capabilities (and most packages do not; see Section 7) a reliable archive should be integrated with the filesystem itself. We have chosen to use the Stanford Archival Vault (SAV) [9, 4], a simplified version of a DBMS which focuses on long term archiving, for the reliable archive component. Note that preserving web pages requires effective storage of the pages themselves as well as the hyperlink structure between them; the issue of maintaining links by preserving page names is ....

....not the entire archive. 6 Figure 4: The snapshot view. 2.1 The Stanford Archival Vault (SAV) In our prototype, the archiving system is the Stanford Archival Vault (SAV) In this section, we give a brief overview of the SAV. For more details about the design and implementation of SAV, see [9, 4]. The SAV system has the following characteristics: ffl Objects are constructed as a list of tagged fields, containing either data or metadata. ffl A signature function is used to create object names. Specifically, a 64 bit CRC is calculated for every object and used as the name. The signature ....

Brian Cooper, Arturo Crespo, and Hector Garcia-Molina. Implementing a reliable digital object archive. http://www-db.stanford.edu/pub/papers/arpaper.ps, 1999. Technical Report.

....Our SAV prototype currently includes four different views, and will be extended to include others. Due to space limitations, in this section we only briefly illustrate two of the views. For a complete discussion, which covers performance issues related to the user interface, please see [4]. Figure 8 is a screen shot of our set interface (an example of a structure view) The objects that participate in sets can be Figure 8: The Sets view viewed through a more generic interface (not shown here) but the set interface is especially tailored to show sets and their members clearly. ....

Brian Cooper, Arturo Crespo, and Hector GarciaMolina. Implementing a reliable digital object archive. http://www-db.stanford.edu/pub/papers/- arpaperext.ps, 1999. Extended version of paper.

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Cooper, B., Crespo, A., and GarciaMolina, H. Implementing a Reliable Digital Object Archive. In Fourth European Conference on Digial Libraries (ECDL 2000.

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Cooper, B., Crespo, A., and GarciaMolina, H. Implementing a Reliable Digital Object Archive. In Fourth European Conference on Digial Libraries (ECDL 2000.

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