1. 11/15/2001Database Management -- Spring 2001 -- R. Larson Object-Relational Database Applications -- The UC Berkeley Environmental Digital Library University of California, Berkeley School of Information Management and Systems SIMS 257: Database Management

2. 11/15/2001Database Management -- Spring 2001 -- R. Larson Today Object Relational Database Applications –The Berkeley Digital Library Project Slides from RRL and Robert Wilensky, EECS –Use of DBMS in DL project.

3. 11/15/2001Database Management -- Spring 2001 -- R. Larson Final Presentations and Reports Specifications for final report are on the Web Site under assignments Presentations (Nov 27 th & 30 th, Dec 4 th and 6 th ) –Signup sheet being passed around.

4. 11/15/2001Database Management -- Spring 2001 -- R. Larson Today Object Relational Applications The UCB Digital Library

5. 11/15/2001Database Management -- Spring 2001 -- R. Larson Overview What is an Digital Library? Overview of Ongoing Research on Information Access in Digital Libraries

6. 11/15/2001Database Management -- Spring 2001 -- R. Larson Digital Libraries Are Like Traditional Libraries... Involve large repositories of information (storage, preservation, and access) Provide information organization and retrieval facilities (categorization, indexing) Provide access for communities of users (communities may be as large as the general public or small as the employees of a particular organization)

7. 11/15/2001Database Management -- Spring 2001 -- R. Larson Originators Libraries Users Traditional Library System

8. 11/15/2001Database Management -- Spring 2001 -- R. Larson But Digital Libraries Are Different From Libraries... Not a physical location with local copies; objects held closer to originators Decoupling of storage, organization, access Enhanced Authoring (origination, annotation, support for work groups) Subscription, pay-per-view supported in addition to “free” browsing. Integration into user tasks.

9. 11/15/2001Database Management -- Spring 2001 -- R. Larson Originators Repositories Users A Digital Library Infrastructure Model Index Services Network

10. 11/15/2001Database Management -- Spring 2001 -- R. Larson UC Berkeley Digital Library Project Foci: Work-centered digital information services and Re-Inventing Scholarly Information Testbed: Digital Library for the California Environment Research: Technical agenda supporting user- oriented access to large distributed collections of diverse data types. Part of the NSF/NASA/DARPA Digital Library Initiative (Phases 1 and 2, and the International DL initiative)

11. 11/15/2001Database Management -- Spring 2001 -- R. Larson UCB Digital Library Project: Research Organizations UC Berkeley EECS, SIMS, CED, IS&T UCOP Xerox PARC’s Document Image Decoding group and Work Practices group Hewlett-Packard NEC SUN Microsystems IBM Almaden Microsoft Ricoh California Research Philips Research

12. 11/15/2001Database Management -- Spring 2001 -- R. Larson Collection: Diverse material relevant to California’s key habitats. Users: A consortium of state agencies, development corporations, private corporations, regional government alliances, educational institutions, and libraries. Potential: Impact on state-wide environmental system (CERES ) Testbed: An Environmental Digital Library

13. 11/15/2001Database Management -- Spring 2001 -- R. Larson The Environmental Library - Users/Contributors California Resources Agency, California Environment Resources Evaluation System (CERES) California Department of Water Resources The California Department of Fish & Game SANDAG UC Water Resources Center Archives New Partners: CDL and SDSC

14. 11/15/2001Database Management -- Spring 2001 -- R. Larson The Environmental Library - Contents Environmental technical reports, bulletins, etc. County general plans Aerial and ground photography USGS topographic maps Land use and other special purpose maps Sensor data “Derived” information Collection data bases for the classification and distribution of the California biota (e.g., SMASCH) Supporting 3-D, economic, traffic, etc. models Videos collected by the California Resources Agency

15. 11/15/2001Database Management -- Spring 2001 -- R. Larson The Environmental Library - Contents As of late 2000, the collection represents about one terabyte of data, including over 165,000 digital images, about 300,000 pages of environmental documents, and nearly 2 million records in geographical and botanical databases.

16. 11/15/2001Database Management -- Spring 2001 -- R. Larson Botanical Data:  The CalFlora Database contains taxonomical and distribution information for more than 8000 native California plants. The Occurrence Database includes over 600,000 records of California plant sightings from many federal, state, and private sources. The botanical databases are linked to our CalPhotos collection of Calfornia plants, and are also linked to external collections of data, maps, and photos.

17. 11/15/2001Database Management -- Spring 2001 -- R. Larson Geographical Data:  Much of the geographical data in our collection is being used to develop our web-based GIS Viewer. The Street Finder uses 500,000 Tiger records of S.F. Bay Area streets along with the 70,000- records from the USGS GNIS database. California Dams is a database of information about the 1395 dams under state jurisdiction. An additional 11 GB of geographical data represents maps and imagery that have been processed for inclusion as layers in our GIS Viewer. This includes Digital Ortho Quads and DRG maps for the S.F. Bay Area.

18. 11/15/2001Database Management -- Spring 2001 -- R. Larson Documents:  Most of the 300,000 pages of digital documents are environmental reports and plans that were provided by California state agencies. This collection includes documents, maps, articles, and reports on the California environment including Environmental Impact Reports (EIRs), educational pamphlets, water usage bulletins, and county plans. Documents in this collection come from the California Department of Water Resources (DWR), California Department of Fish and Game (DFG), San Diego Association of Governments (SANDAG), and many other agencies. Among the most frequently accessed documents are County General Plans for every California county and a survey of 125 Sacramento Delta fish species.

19. 11/15/2001Database Management -- Spring 2001 -- R. Larson Documents - cont.  The collection also includes about 20Mb of full-text (HTML) documents from the World Conservation Digital Library. In addition to providing online access to important environmental documents, the document collection is the testbed for our Multivalent Document research.

20. 11/15/2001Database Management -- Spring 2001 -- R. Larson Image Data The photo collection includes over 17,000 images of California natural resources from the state Department of Water Resources, several hundred aerial photos, over 17,000 photos of California native plants from St. Mary's College, the California Academy of Science, and others, a small collection of California animals, and 40,000 Corel stock photos. These images are used within the project for computer vision research

21. 11/15/2001Database Management -- Spring 2001 -- R. Larson Testbed Success Stories LUPIN: CERES’ Land Use Planning Information Network –California Country General Plans and other environmental documents. –Enter at Resources Agency Server, documents stored at and retrieved from UCB DLIB server. California flood relief efforts –High demand for some data sets only available on our server (created by document recognition). CalFlora: Creation and interoperation of repositories pertaining to plant biology. Cloning of services at Cal State Library, FBI

22. 11/15/2001Database Management -- Spring 2001 -- R. Larson Research Highlights Documents –Multivalent Document prototype Page images, structured documents, GIS data, photographs Intelligent Access to Content –Document recognition –Vision-based Image Retrieval: stuff, thing, scene retrieval –Natural Language Processing: categorizing the web, Cheshire II, TileBar Interfaces

23. 11/15/2001Database Management -- Spring 2001 -- R. Larson Multivalent Documents MVD Model –radically distributed, open, extensible –“behaviors” and “layers” behaviors conform to a protocol suite inter-operation via “IDEG” Applied to “enlivening legacy documents” –various nice behaviors, e.g., lenses

24. 11/15/2001Database Management -- Spring 2001 -- R. Larson Document Presentation Problem: Digital libraries must deliver digital documents -- but in what form? Different forms have advantages for particular purposes –Retrieval –Reuse –Content Analysis –Storage and archiving Combining forms (Multivalent documents)

25. 11/15/2001Database Management -- Spring 2001 -- R. Larson Spectrum of Digital Document Representations Adapted from Fox, E.A., et al. “Users, User Interfaces and Objects: Evision, an Electronic Library”, JASIS 44(8), 1993

26. 11/15/2001Database Management -- Spring 2001 -- R. Larson Document Representation: Multivalent Documents Primary user interface/document model for UCB Digital Library (Wilensky & Phelps) Goal: An approach to new document representations and their authoring. Supports active, distributed, composable transformations of multimedia documents. Enables sophisticated annotations, intelligent result handling, user-modifiable interface, composite documents.

27. 11/15/2001Database Management -- Spring 2001 -- R. Larson Multivalent Documents Cheshire Layer OCR Layer OCR Mapping Layer History of The Classical World The jsfj sjjhfjs jsjj jsjhfsjf sjhfjksh sshf jsfksfjk sjs jsjfs kj sjfkjsfhskjf sjfhjksh skjfhkjshfjksh jsfhkjshfjkskjfhsfh skjfksjflksjflksjflksf sjfksjfkjskfjskfjklsslk slfjlskfjklsfklkkkdsj ksfksjfkskflk sjfjksf kjsfkjsfkjshf sjfsjfjks ksfjksfjksjfkthsjir\\ ks ksfjksjfkksjkls’ks klsjfkskfksjjjhsjhuu sfsjfkjs Modernjsfj sjjhfjs jsjj jsjhfsjf sslfjksh sshf jsfksfjk sjs jsjfs kj sjfkjsfhskjf sjfhjksh skjfhkjshfjksh jsfhkjshfjkskjfhsfh skjfksjflksjflksjflksf sjfksjfkjskfjskfjklsslk slfjlskfjklsfklkkkdsj GIS Layer taksksh kdjjdkd kdjkdjkd kj sksksk kdkdk kdkd dkk skksksk jdjjdj clclc ldldl taksksh kdjjdkd kdjkdjkd kj sksksk kdkdk kdkd dkk skksksk jdjjdj clclc ldldl Table 1. Table Layer kdk dkd kdk Scanned Page Image Valence: 2: The relative capacity to unite, react, or interact (as with antigens or a biological substrate). Webster’s 7th Collegiate Dictionary Network Protocols & Resources

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30. 11/15/2001Database Management -- Spring 2001 -- R. Larson MVD Third Party Work Japanese support by NEC; application to office document management Printing, support for other OCR formats, by HP Chinese character and multilingual lens by UCB Instructional Support staff (Owen McGrath) Automatic enlivening of documents via Transcend proxy.

31. 11/15/2001Database Management -- Spring 2001 -- R. Larson MVD Forthcoming Support for XML + style sheets More robust parsing Saving where you want Media adaptors for –Continuous media –Near image formats, word proc. formats Improve authoring tools Interoperation with paper Application versus applet? Release to community, get feedback, iterate.

32. 11/15/2001Database Management -- Spring 2001 -- R. Larson GIS in the MVD Framework Layers are georeferenced data sets. Behaviors are –display semi-transparently –pan –zoom –issue query –display context –“spatial hyperlinks” –annotations Written in Java (to be merged with MVD-1 code line?)

33. 11/15/2001Database Management -- Spring 2001 -- R. Larson GIS Viewer: Recent Developments Annotation and saving –points, rectangles (w. labels and links), vectors –saving of annotations as separate layer Integration with address, street finding, gazetteer services Application to image viewing: tilePix Castanet client

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37. 11/15/2001Database Management -- Spring 2001 -- R. Larson GIS Viewer Example http://elib.cs.berkeley.edu/annotations/gis/buildings.html

38. 11/15/2001Database Management -- Spring 2001 -- R. Larson Geographic Information: Plans and Ideas More annotations, flexible saving Support for large vector data sets Interoperability –On-the-fly conversion of formats generation of “catalogs” –Via OGDI/GLTP –Experimenting with various CERES servers

39. 11/15/2001Database Management -- Spring 2001 -- R. Larson Documents: Information from scanned document Built document recognizers for some important documents, e.g. “Bulletin 17”. “TR-9”. Recognized document structure, with order magnitude better OCR. Automatically generated 1395 item dam relational data base. Enabled access via forms, map interfaces. Enable interoperation with image DB.

43. 11/15/2001Database Management -- Spring 2001 -- R. Larson Document Recognition: Future Plans Document recognizers: for ~ dozen document types Development and integration of mathematical OCR and recognition. Eventually produce document recognizer generator, i.e., make it easier to write recognizers.

44. 11/15/2001Database Management -- Spring 2001 -- R. Larson Vision-Based Image Retrieval Stuff-based queries: “blobs” –Basic blobs: colors, sizes, variable number demonstrated utility for interesting queries –“Blob world”: Above plus texture, applied to retrieving similar images successful learning scene classifier Thing-finding: Successfully deployed detectors adding body plans (adding shape, geometry and kinematic constraints) Find objects by grouping coherent low-level properties

45. 11/15/2001Database Management -- Spring 2001 -- R. Larson Image Retrieval Research Finding “Stuff” vs “Things” BlobWorld Other Vision Research

46. 11/15/2001Database Management -- Spring 2001 -- R. Larson (Old “stuff”-based image retrieval: Query)

47. 11/15/2001Database Management -- Spring 2001 -- R. Larson (Old “stuff”-based image retrieval: Result)

48. 11/15/2001Database Management -- Spring 2001 -- R. Larson Blobworld: use regions for retrieval We want to find general objects  Represent images based on coherent regions

51. 11/15/2001Database Management -- Spring 2001 -- R. Larson (“Thing”-based image retrieval using “body plans”: Result)

52. 11/15/2001Database Management -- Spring 2001 -- R. Larson Natural Language Processing Automatic Topic Assignment Developed automatic categorization/disambiguation method to point where topic assignment (but not disambiguation) appears feasible. Ran controlled experiment: –Took Yahoo as ground truth. –Chose 9 overlapping categories; took 1000 web pages from Yahoo as input. –Result: 84% precision; 48% recall (using top 5 of 1073 categories)

53. 11/15/2001Database Management -- Spring 2001 -- R. Larson Distributed Resource Discovery and Structured Data Searching With Cheshire II Ray R. Larson School of Information Management & Systems University of California, Berkeley ray@sherlock.berkeley.edu

54. 11/15/2001Database Management -- Spring 2001 -- R. Larson Research Areas Goals are –Practical application of existing Digital Library technologies to some large-scale cross-domain collections Evaluation of distributed search in cross-domain environment –Theoretical examination and evaluation of next- generation designs for systems architecture and and distributed cross-domain searching for DLs

55. 11/15/2001Database Management -- Spring 2001 -- R. Larson Approach For the first goal, we are implementing a distributed search system based on international standards (Z39.50 and SGML/XML) using the Cheshire II information retrieval system Databases include: –HE Archives hub –Arts and Humanities Data Service (AHDS) –MASTER –CURL (Consortium of University Research Libraries) –Online Archive of California (OAC) –Making of America II (MOA2)

56. 11/15/2001Database Management -- Spring 2001 -- R. Larson Current Usage of Cheshire II Web clients for: –Berkeley NSF/NASA/ARPA Digital Library –World Conservation Digital Library –SunSite (UC Berkeley Science Libraries) –University of Liverpool –Higher Education Archives Hub Glasgow, Edinburgh, Bath, Liverpool, Kings College London, University College London, Nottingham, Durham, School of Oriental and African Studies, Manchester, Southhampton, Warwick and others (to be expanded) –University of Essex, HDS (part of AHDS) –Oxford Text Archive (test only) –California Sheet Music Project –Cha-Cha (Berkeley Intranet Search Engine) –Berkeley Metadata project cross-language demo –Univ. of Virginia (test implementations) –Cheshire ranking algorithm is basis for original Inktomi

57. 11/15/2001Database Management -- Spring 2001 -- R. Larson Current and Upcoming Usage of Cheshire II DIEPER Digitized European Periodicals project. –http://gdz.sub.uni-goettingen.de/dieper/ NESSTAR (Networked Social Science Tools and Resources. –http://www.nesstar.org/ FASTER – Flexible Access to Statistics Tables and Electronic Resources. (Continuation of NESSTAR) –http://www.faster-data.org/ MASTER (Manuscript Access through Standards for Electronic Records. –http://www.cta.dmu.ac.uk/projects/master/

58. 11/15/2001Database Management -- Spring 2001 -- R. Larson Upcoming Usage of Cheshire II ZETOC (Prototype of the Electronic Table of Contents from the British Library) –http://zetoc.mimas.ac.uk/ Archives Hub –http://www.archiveshub.ac.uk/ RSLP Palaeography project –http://www.palaeography.ac.uk/ British Natural History Museum, London JISC data services directory hosted by MIMAS Resource Discovery Network (RDN), where it will be used to harvest RDN records from the various hubs using OAI and provide search

59. 11/15/2001Database Management -- Spring 2001 -- R. Larson Client/Server Architecture Server Supports: –Database storage –Indexing –Z39.50 access to local data –Boolean and Probabilistic Searching –Relevance Feedback –External SQL database support Client Supports: –Programmable (Tcl/Tk) Graphical User Interface –Z39.50 access to remote servers –SGML/XML & MARC formatting Combined Client/Server CGI scripting via WebCheshire used for web applications Mozilla client (under development in Liverpool)

60. 11/15/2001Database Management -- Spring 2001 -- R. Larson SGML/XML Support Example XML record for a DL document ELIB-v1.0 756 June 12, 1996 June 1996 Cumulative Watershed Effects: Applicability of Available Methodologies to the Sierra Nevada University of California report USDA Forest Service Neil H. Berg Ken B. Roby Bruce J. McGurk SNEP Vol 3 40 /elib/data/docs/0700/756/HYPEROCR/hyperocr.html /elib/data/docs/0700/756/OCR-ASCII-NOZONE

61. 11/15/2001Database Management -- Spring 2001 -- R. Larson 00722 n a m 2 2 00229 4 5 0 00100140000000500170001400800410003101000140007203500200008603500170010 610000190012324501050014225000110024726000320025830000330029050400500032365000360 0373700002200409700002200431950003200453998000700485 CUBGGLAD1282B 19940414143202.0 830810 1983 nyu eng u 82019962 (CU)ocm08866667 (CU)GLAD1282 Burch, John G. Information systems : theory and practice / John G. Burch, Jr., Felix R. Strater, Gary Grudnitski 3rd ed New York : J. Wiley, 1983 xvi, 632 p. : ill. ; 24 cm Includes bibliographical references and index Management information systems.... SGML/XML Support Example SGML/MARC Record

62. 11/15/2001Database Management -- Spring 2001 -- R. Larson Component Extraction and Retrieval Any sub-elements of an SGML/XML document can be defined as a separately indexed “component”. Components can be ranked and retrieved independently of the source document (but linked back to their original source) For example paragraphs and abstracts in the full text of documents could be defined as components to provide paragraph-level search Example: Glassier archives…

63. 11/15/2001Database Management -- Spring 2001 -- R. Larson Component Extraction and Retrieval The Glassier archive is an EAD document (1.9 Mb in size) Contains “Series, Subseries, and Item level” descriptions of things in the archive

64. 11/15/2001Database Management -- Spring 2001 -- R. Larson Excerpt from Glasier Archive GP-1-1: General correspondence. Public letters. GP-1-1 Glasier Papers. General correspondence. Public letters. Arrangement Public letters arranged alphabetically within each year GP-1-1-0001 Letter from Richard Murray. Glasgow ; <unitdate > 7 Apr 1879. Murray, Richard 1 letter Employment reference for J.B.G. as draughtsman Glasier, John Bruce ETC….

65. 11/15/2001Database Management -- Spring 2001 -- R. Larson Example Component Def … /home/ray/Work/Glasier_test/indexes/COMPONENT_DB1 NONE c level item …

66. 11/15/2001Database Management -- Spring 2001 -- R. Larson Components Both individual tags and “ranges” with a starting tag and (different) ending tag can be used as components Components permit parts of complex SGML/XML documents to be treated as separate documents

67. 11/15/2001Database Management -- Spring 2001 -- R. Larson Cheshire II Searching Z39.50 Internet Images Scanned Text LocalRemote Z39.50

68. 11/15/2001Database Management -- Spring 2001 -- R. Larson Probabilistic Retrieval: Logistic Regression attributes Average Absolute Query Frequency Query Length Average Absolute Document Frequency Document Length Average Inverse Document Frequency Inverse Document Frequency Number of Terms in common between query and document -- logged

69. 11/15/2001Database Management -- Spring 2001 -- R. Larson Probabilistic Retrieval: Logistic Regression Probability of relevance is based on Logistic regression from a sample set of documents to determine values of the coefficients (TREC). At retrieval the probability estimate is obtained by: For the 6 X attribute measures shown on the previous slide

70. 11/15/2001Database Management -- Spring 2001 -- R. Larson Cheshire Probabilistic Retrieval Uses Logistic Regression ranking method developed at Berkeley with new algorithm for weigh calculation at retrieval time. Z39.50 “relevance” operator used to indicate probabilistic search Any index can have Probabilistic searching performed: –zfind topic @ “cheshire cats, looking glasses, march hares and other such things” –zfind title @ caucus races Boolean and Probabilistic elements can be combined: –zfind topic @ government documents and title guidebooks

71. 11/15/2001Database Management -- Spring 2001 -- R. Larson Combining Search Types It is also possible to combine the results of multiple independent searches into a single result set. (using the Z39.50 SORT service of the Cheshire system) –E.g.: –Search of Full Text (Probabilistic) –Search of Full Text (Boolean) –Search of Components (Probabilistic) –Search of Titles (Probabilistic) –Search of Subject Headings (Probabilistic) All result sets are merged and re-ranked to produce the final list.

72. 11/15/2001Database Management -- Spring 2001 -- R. Larson Distributed Search: The Problem Hundreds or Thousands of servers with databases ranging widely in content, topic, format –Broadcast search is expensive in terms of bandwidth and in processing too many irrelevant results –How to select the “best” ones to search? What to search first Which to search next –Topical /domain constraints on the search selections –Variable contents of database (metadata only, full text…)

73. 11/15/2001Database Management -- Spring 2001 -- R. Larson An Approach for Cross- Domain Resource Discovery MetaSearch –New approach to building metasearch based on Z39.50 –Instead of using broadcast search we are using two Z39.50 Services Identification of database metadata using Z39.50 Explain Extraction of distributed indexes using Z39.50 SCAN Evaluation –How efficiently can we build distributed indexes? Very… –How effectively can we choose databases using the index? –How effective is merging search results from multiple sources? –Hierarchies of servers (general/meta-topical/individual)?

74. 11/15/2001Database Management -- Spring 2001 -- R. Larson Z39.50 Overview UI Map Query Internet Map Results Map Query Map Results Map Query Map Results Search Engine

75. 11/15/2001Database Management -- Spring 2001 -- R. Larson Z39.50 Explain Explain supports searches for –Server-Level metadata Server Name IP Addresses Ports –Database-Level metadata Database name Search attributes (indexes and combinations) –Support metadata (record syntaxes, etc)

76. 11/15/2001Database Management -- Spring 2001 -- R. Larson Z39.50 SCAN Originally intended to support Browsing Query for –Database –Attributes plus Term (i.e., index and start point) –Step Size –Number of terms to retrieve –Position in Response set Results –Number of terms returned –List of Terms and their frequency in the database (for the given attribute combination)

77. 11/15/2001Database Management -- Spring 2001 -- R. Larson Z39.50 SCAN Results % zscan title cat 1 20 1 {SCAN {Status 0} {Terms 20} {StepSize 1} {Position 1}} {cat 27} {cat-fight 1} {catalan 19} {catalogu 37} {catalonia 8} {catalyt 2} {catania 1} {cataract 1} {catch 173} {catch-all 3} {catch-up 2} … zscan topic cat 1 20 1 {SCAN {Status 0} {Terms 20} {StepSize 1} {Position 1}} {cat 706} {cat-and-mouse 19} {cat-burglar 1} {cat-carrying 1} {cat-egory 1} {cat-fight 1} {cat-gut 1} {cat-litter 1} {cat-lovers 2} {cat-pee 1} {cat-run 1} {cat-scanners 1} … Syntax: zscan indexname1 term stepsize number_of_terms pref_pos

78. 11/15/2001Database Management -- Spring 2001 -- R. Larson MetaSearch Server Index Creation For all servers, or a topical subset… –Get Explain information (especially DC mappings) –For each index (or each DC index) Use SCAN to extract terms and frequency Add term + freq + source index + database metadata to the metasearch “Collection Document” (XML) –Planned extensions: Post-Process indexes (especially Geo Names, etc) for special types of data –e.g. create “geographical coverage” indexes

79. 11/15/2001Database Management -- Spring 2001 -- R. Larson MetaSearch Approach MetaSearch Server Map Explain And Scan Queries Internet Map Results Map Query Map Results Search Engine DB2DB 1 Map Query Map Results Search Engine DB 4DB 3 Distributed Index Search Engine Db 6 Db 5

80. 11/15/2001Database Management -- Spring 2001 -- R. Larson Known Problems Not all Z39.50 Servers support SCAN or Explain Solutions: –Probing for attributes instead of explain (e.g. DC attributes or analogs) –We also support OAI and can extract OAI metadata for servers that support OAI Collection Documents are static and need to be replaced when the associated collection changes

81. 11/15/2001Database Management -- Spring 2001 -- R. Larson Evaluation Test Environment –TREC Tipster and FT data (approx. 3.5 GB) –Partitioned into 236 smaller collections based on source and (for TIPSTER) date by month (Distributed Search Testbed built by French, et al.) High size variability (Range from 1 to thousands of docs) 21,225,299 Words, 142,345,670 chars total for harvested records Efficiency (old data) –Average of 23.07 seconds per database to SCAN each database (3.4 indexes on average) –Average of 14.07 seconds excluding FT (131 seconds for FT database with 7 indexes) –Now collecting more information – so longer harvest times longer, but still under one minute on average

82. 11/15/2001Database Management -- Spring 2001 -- R. Larson Evaluation Effectiveness –Still working on evaluation comparing our DB ranking with the TIPSTER relevance judgements –Can be compared with published selection methods (CORI, GlOSS, etc.) using the same testbed

83. 11/15/2001Database Management -- Spring 2001 -- R. Larson Future Testing of variant algorithms for ranking collections Application to real systems and testing in a production environment (Archives Hub) Logically Clustering servers by topic Meta-Meta Servers (treating the MetaSearch database as just another database)

84. 11/15/2001Database Management -- Spring 2001 -- R. Larson Distributed Metadata Servers Replicated servers Meta-Topical Servers General Servers Database Servers

85. 11/15/2001Database Management -- Spring 2001 -- R. Larson Further Information Full Cheshire II client and server source is available ftp://cheshire.berkeley.edu/pub/cheshire/ –Includes HTML documentation Project Web Site http://cheshire.berkeley.edu/