2853 search results - page 50 / 571 » On the Efficiency of Provenance Queries |
SIGMOD
2004
ACM
15 years 10 months ago
2004
ACM
Peer data management systems (PDMS) offer a flexible architecture for decentralized data sharing. In a PDMS, every peer is associated with a schema that represents the peer's...
VLDB
1998
ACM
15 years 1 months ago
1998
ACM
Many applications compute aggregate functions over an attribute (or set of attributes) to find aggregate values above some specified threshold. We call such queries iceberg querie...
ADC
2000
Springer
15 years 1 months ago
2000
Springer
Answering range queries is a common database operation. Methods based on hashing techniques to minimise the cost of answering range queries by taking the query distribution into a...
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CCS
2008
ACM
14 years 11 months ago
2008
ACM
We propose an approach for the selective enforcement of access control restrictions in, possibly distributed, large data collections based on two basic concepts: i) flexible autho...
IS
2007
14 years 9 months ago
2007
: A number of indexing techniques have been proposed in recent times for optimizing the queries on XML and other semistructured data models. Most of the semistructured models use t...