The Chase Procedure and its Applications in Data Exchange
نویسنده
چکیده
The initial and basic role of the chase procedure was to test logical implication between sets of dependencies in order to determine equivalence of database instances known to satisfy a given set of dependencies and to determine query equivalence under database constrains. Recently the chase procedure has experienced a revival due to its application in data exchange. In this chapter we review the chase algorithm and its properties as well as its application in data exchange. 1998 ACM Subject Classification H.2.5 [Heterogeneous Databases]: Data translation
منابع مشابه
The chase procedure and its applications
The chase procedure and its applications Adrian Constantin Onet, Ph.D. Concodria University, 2012 The goal of this thesis is not only to introduce and present new chasebased algorithms, but also to investigate the differences between the main existing chase procedures. In order to achieve this, first we will investigate and do a clear delimitation between the existing chase algorithms based on ...
متن کاملData Exchange, Integration, and Streams | DFU, Vol. 5 | Complete Volume
The initial and basic role of the chase procedure was to test logical implication between sets ofdependencies in order to determine equivalence of database instances known to satisfy a givenset of dependencies and to determine query equivalence under database constrains. Recently thechase procedure has experienced a revival due to its application in data exchange. In this chapter<lb...
متن کاملChaseT: A Tool for Chase algorithms
The Chase is a simple fixpoint algorithm, proposed 30 years ago, for testing and enforcing implication of data dependencies in database systems. It plays important roles in database theory as well as in practical applications such as data exchange, data integration, data warehousing, federated databases and others. It is also used, directly or indirectly, on an everyday basis by people who desi...
متن کاملImpact of Long-term Debt on Overinvestment Problem of Agency
Business units are always faced with investment opportunities and need to make logical decisions on an optimal investment. Indeed, the investment of each business unit should be done with regard to the resource constraints and its effectiveness through the criteria for evaluating the projects including the net present value (NPV). The paper aims to investigate the effect of long-term debt on th...
متن کاملThe Effect of Investment on the Financing of Listed Companies in Tehran Stock Exchange
In the world and in our country, Iran, many researches have been done in the field of financing, but due to the importance of this issue, it needs more thought and contemplation. Therefore, this study assessed “the impact of investments on financing of companies listed on the Tehran Stock Exchange”. The statistical sample is consisted of companies listed on the Tehran Stock Exchange during a fi...
متن کامل