Zobrazeno 1 - 10
of 114
pro vyhledávání: '"Stephen J. Hegner"'
Publikováno v:
Computational Linguistics, Vol 27, Iss 4 (2021)
Externí odkaz:
https://doaj.org/article/385c6e8eb4b84b8e80ad8ebf7bb903a4
Autor:
Stephen J. Hegner, M. Andrea Rodríguez
Publikováno v:
Informatica. 28:45-78
Data involving spatial and/or temporal attributes are often represented at different levels of granularity in different source schemata. In this work, a model of such multigranular data is develope ...
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd55af12877f05cf05e42b502d0eb5ba
https://doi.org/10.15388/informatica.2017.120
https://doi.org/10.15388/informatica.2017.120
Autor:
Stephen J. Hegner
Publikováno v:
Advances in Databases and Information Systems ISBN: 9783030287290
ADBIS
ADBIS
Modern database-management systems permit the isolation level to be set on a per-transaction basis. In such a mixed-level setting, it is important to understand how transactions running at different levels interact. More fundamentally however, these
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::4a5ce18baf822857ca27fd6718f0a939
https://doi.org/10.1007/978-3-030-28730-6_24
https://doi.org/10.1007/978-3-030-28730-6_24
Autor:
Stephen J. Hegner, M. Andrea Rodríguez
Publikováno v:
Lecture Notes in Computer Science ISBN: 9783319988085
DEXA (1)
DEXA (1)
Domains for spatial and temporal data are often multigranular in nature, possessing a natural order structure defined by spatial inclusion and time-interval inclusion, respectively. This order structure induces lattice-like (partial) operations, such
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::bd26a5bf4afd9d472ac9886e059611fe
https://doi.org/10.1007/978-3-319-98809-2_23
https://doi.org/10.1007/978-3-319-98809-2_23
Autor:
Stephen J. Hegner
Publikováno v:
Annals of Mathematics and Artificial Intelligence. 76:281-326
A method for detecting potential violations of integrity constraints of concurrent transactions running under snapshot isolation (SI) is presented. Although SI provides a high level of isolation, it does not, by itself, ensure that all integrity cons
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::d54e662879d8bd4a451cd7e1278a9446
https://doi.org/10.1007/s10472-015-9482-6
https://doi.org/10.1007/s10472-015-9482-6
Autor:
M. Andrea Rodríguez, Stephen J. Hegner
Publikováno v:
Advances in Databases and Information Systems ISBN: 9783319440385
ADBIS
ADBIS
When data from several source schemata are to be integrated, it is essential that the resulting data in the global schema be consistent. This problem has been studied extensively for the monogranular case, in which all domains are flat. However, data
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::e8183e56984b460007e405a707110255
https://doi.org/10.1007/978-3-319-44039-2_16
https://doi.org/10.1007/978-3-319-44039-2_16
Autor:
Stephen J. Hegner
Publikováno v:
Annals of Mathematics and Artificial Intelligence. 63:317-355
For the problem of reflecting an update on a database view to the main schema, the constant-complement strategies are precisely those which avoid all update anomalies, and so define the gold standard for well-behaved solutions to the problem. However
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0cb785ac7f5848bbe80a74f842da975f
https://doi.org/10.1007/s10472-012-9278-x
https://doi.org/10.1007/s10472-012-9278-x
Autor:
Stephen J. Hegner
Publikováno v:
Annals of Mathematics and Artificial Intelligence. 46:38-97
It is well known that the complexity of testing the correctness of an arbitrary update to a database view can be far greater than the complexity of testing a corresponding update to the main schema. However, views are generally managed according to s
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::437add16b3b678665edda9cebe789b35
https://doi.org/10.1007/s10472-005-9013-y
https://doi.org/10.1007/s10472-005-9013-y
Autor:
Stephen J. Hegner
Publikováno v:
Annals of Mathematics and Artificial Intelligence. 40:63-125
The fundamental problem in the design of update strategies for views of database schemata is that of selecting how the view update is to be reflected back to the base schema. This work presents a solution to this problem, based upon the dual philosop
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2a513cb8f45038467718851b78b247f7
https://doi.org/10.1023/a:1026158013113
https://doi.org/10.1023/a:1026158013113
Autor:
Stephen J. Hegner
Publikováno v:
Lecture Notes in Computer Science ISBN: 9783319049380
FoIKS
FoIKS
A method for detecting potential violations of integrity constraints of concurrent transactions running under snapshot isolation SI is presented. In contrast to methods for ensuring full serializability under snapshot isolation, violations of integri
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6d4148af98911ae2d5db2a095ed014a0
https://doi.org/10.1007/978-3-319-04939-7_11
https://doi.org/10.1007/978-3-319-04939-7_11