Database system concepts
Statistical profile estimation in database systems
ACM Computing Surveys (CSUR)
Estimating the size of generalized transitive closures
VLDB '89 Proceedings of the 15th international conference on Very large data bases
Practical selectivity estimation through adaptive sampling
SIGMOD '90 Proceedings of the 1990 ACM SIGMOD international conference on Management of data
Principles of distributed database systems
Principles of distributed database systems
Statistical estimators for aggregate relational algebra queries
ACM Transactions on Database Systems (TODS)
Statistical estimators for relational algebra expressions
Proceedings of the seventh ACM SIGACT-SIGMOD-SIGART symposium on Principles of database systems
Accurate estimation of the number of tuples satisfying a condition
SIGMOD '84 Proceedings of the 1984 ACM SIGMOD international conference on Management of data
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Query optimization in heterogeneous database systems is not always possible since the component DBMS may not have the ability to transmit necessary information. However, these systems need query optimization because the cost of transmitting large quantities of data across diverse databases is very high. We propose a query strategy which uses hypothesis testing to determine which of two sets of data are larger. Our experiments show that this strategy is very likely to select the smaller set when the sampling results fall outside a region of uncertainty we call the “grey zone.” This provides query optimization without transmission of database statistics.