Access Methods for Multiversion Data
{'Code': '05020000', 'Directorate': {'Abbreviation': 'CSE', 'LongName': 'Direct For Computer & Info Scie & Enginr'}, 'Division': {'Abbreviation': 'IIS', 'LongName': 'Div Of Information & Intelligent Systems'}}
{'SignBlockName': 'Maria Zemankova'}
The Time-Split B-tree is a system of data retrieval which takes            advantage of the best aspects of two storage mediums: cheap, sturdy,            non-erasable, but slow-access optical disk storage and more                     expensive but faster-access magnetic disk storage.  This is                     accomplished by placing recent versions of data on magnetic disk                where it can be updated quickly and incrementally moving older data             to the slower optical disk as it matures.  In addition, keeping all             versions of data takes the place of a log and makes recovery simple.            The principal investigator plans to analyze, refine and extend the              Time-Split B-tree by:  parameterizing space utilization on both                 mediums to improve performance for an expected use pattern;                     providing support for several kinds of temporal semantics; comparing            with other proposed methods for using both mediums; providing                   support for large hierarchical versioned objects; allowing                      intermediate versions of records to be discarded; and,                          consolidating current (magnetic disk) data when old versions are                migrated to optical disk.  The research will contribute to the                  understanding of the interaction between access methods, transaction            processing, temporal semantics, versioning and the interplay of                 storage mediums with different characteristics.
{'FirstName': 'Betty', 'LastName': 'Salzberg', 'EmailAddress': 'salzberg@ccs.neu.edu', 'StartDate': '11/15/1988', 'EndDate': None, 'RoleCode': 'Principal Investigator'}
{'Name': 'Northeastern University', 'CityName': 'BOSTON', 'ZipCode': '021155005', 'PhoneNumber': '6173733004', 'StreetAddress': '360 HUNTINGTON AVE', 'CountryName': 'United States', 'StateName': 'Massachusetts', 'StateCode': 'MA'}
{'Code': '6855', 'Text': 'INFORMATION & KNOWLEDGE MANAGE'}
{'url': 'https://www.nsf.gov/awardsearch/download?DownloadFileName=1988&All=true', 'xml': '8815707.xml'}