413 search results - page 46 / 83 » Optimizing Queries Across Diverse Data Sources |
154
click to vote
ICDE
2004
IEEE
15 years 11 months ago
2004
IEEE
Query optimization in data integration requires source coverage and overlap statistics. Gathering and storing the required statistics presents many challenges, not the least of wh...
175
click to vote
SIGMOD
2009
ACM
15 years 10 months ago
2009
ACM
Ranking queries are essential tools to process large amounts of probabilistic data that encode exponentially many possible deterministic instances. In many applications where unce...
PVLDB
2010
14 years 4 months ago
2010
Database evolution is the process of updating the schema of a database or data warehouse (schema evolution) and evolving the data to the updated schema (data evolution). Database ...
107
click to vote
JACM
2012
13 years 5 days ago
2012
A fundamental problem in data management is to draw and maintain a sample of a large data set, for approximate query answering, selectivity estimation, and query planning. With la...
EDBT
2008
ACM
15 years 10 months ago
2008
ACM
Enterprises may have multiple database systems spread across the organization for redundancy or for serving different applications. In such systems, query workloads can be distrib...