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What is data model? Explain object based and record based data models?
Ans: A data model is an abstract model in which describes how data is represented and accessed.
(i) Object based data models: Same to a relational database model, but objects, classes and inheritance are directly supported within database schemas and in the query language
(ii) Record based data models: is a database model based on first-order predicate logic. Its core idea is to elaborate a database as a collection of predicates over a finite set of predicate variables, describing constraints on the possible values and combinations of values.
Project Description: Oracle Certified Professional with 20 years of practice, Oracle version 6.0.34, 7.3, 8.0, 8i, 9i, 10G, 11G, 12C. Crossplatform migration, Informix, MSSql
Database Recovery And Security Introduction In this part we will introduce two main issues relating to database management systems. A computer system suffers from dissi
What is a relationship called when it is maintained between two entities? A relationship is called Binary relationship when it is maintained between two entities.
Implementation of association as an object Implement as a separate association object, independent of either class, as in Figure. An association object is a group of pairs
Support by Adding Indexes Multiple indexes can be used to access a data file by multiple access paths. In such a scheme only single copy of the data is consider, only the numbe
With the help of a suitable diagram gives module wise explanation of system architecture of DBMS.on..
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
each publisher has uniqe name a mial addrs are also kept on each pubisher.a publisher publish one book.a book publish y one publisher.book identified by isbn.each book writn by one
how draw er diagram
What are the drawbacks of File Oriented System in details?
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