Integrity constraints are usually assumed to be permanent properties that must be satisfied by any database state. However, there are many situations requiring also temporary constraints, that is, constraints that must hold only for a single database state. In this paper we propose a schema to define both permanent and temporary constraints, that supports efficient constraint checking and semantic query optimization. The proposed schema associates integrity constraints to rules and queries, and it uses methods, that were originally defined for permanent constraints only, to perform constraint checking and semantic query optimization.
Using Temporary Integrity Constraints to Optimize Databases
TURINI, FRANCO
1996-01-01
Abstract
Integrity constraints are usually assumed to be permanent properties that must be satisfied by any database state. However, there are many situations requiring also temporary constraints, that is, constraints that must hold only for a single database state. In this paper we propose a schema to define both permanent and temporary constraints, that supports efficient constraint checking and semantic query optimization. The proposed schema associates integrity constraints to rules and queries, and it uses methods, that were originally defined for permanent constraints only, to perform constraint checking and semantic query optimization.File in questo prodotto:
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