منابع مشابه
Relational databases and beyond
Database systems provide the engines for GIS. In the database approach, the computer acts as a facilitator of data storage and sharing. It also allows the data to be modified and analysed while in the store. For a computer system to be an effective data store, it must have the confidence of its users. Data owners and depositors must have confidence that the data will not be used in unauthorised...
متن کاملRelational Databases Query Optimization using Hybrid Evolutionary Algorithm
Optimizing the database queries is one of hard research problems. Exhaustive search techniques like dynamic programming is suitable for queries with a few relations, but by increasing the number of relations in query, much use of memory and processing is needed, and the use of these methods is not suitable, so we have to use random and evolutionary methods. The use of evolutionary methods, beca...
متن کاملAn advanced course in database systems - beyond relational databases
Why should wait for some days to get or receive the an advanced course in database systems beyond relational databases book that you order? Why should you take it if you can get the faster one? You can find the same book that you order right here. This is it the book that you can receive directly after purchasing. This an advanced course in database systems beyond relational databases is well k...
متن کاملConverting Relational Databases into Object-relational Databases
ion (abs): A super-class is abstract (i.e., abs := true) when all of its objects are members of its sub-type objects. Instances of an abstract type cannot appear in the database extension, but are subsumed into instances of its sub-types. Attributes (Acdm): A class C has a set of attributes Acdm. Acdm := {a | a := 〈an, t, tag, l, n, d〉}, where each attribute a has a name an, data type t and a t...
متن کاملRelational Geographic Databases
This paper proposes a generic relational-database schema that can efficiently accommodate various types of GIS data. The proposed schema complies with the OpenGIS Simple Features Specification for SQL developed by OGC (OpenGIS Consortium) and can be used for any geographic application whose geographic objects are represented based on 2D geometry with linear interpolation between vertices. The g...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Communications of the ACM
سال: 2008
ISSN: 0001-0782,1557-7317
DOI: 10.1145/1364782.1364797