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What disadvantage of ODBC does OLE DB overcome?
By breaking the features and the methods of a DBMS into COM objects, OLE DB characteristic overcomes a main disadvantage of ODBC. With ODBC, a vendor must make an ODBC driver for almost all DBMS features and functions in order to participate in ODBC at all. This is a huge task that needs a substantial initial investment. With OLE DB, though, a DBMS vendor can implement portions of their product.
What is recursive closure? Why is it not possible to describe this operation in relational algebra? Recursive closure is applied to recursive relationship. An instance of rec
The External or View Level The external or view level is the highest level of abstraction of database. It gives a window on the conceptual view, which permits the user to see
System Design: An Object Oriented Approach Any software systems always try to change and evolve as technology and business rules evolve. The development of information systems
Define data conversion? Helpful to load data into temporary staging tables. Then can write SQL code to do much of data processing. SQL code is simpler and faster to write than
Consider the relations EMP(ENO,ENAME,AGE,BASIC_SALARY) WORK_IN(ENO,DNO) DEPT(DNO,DNAME,CITY) Express the following queries in SQL (i) Find names of employees who work in a dep
Define entity integrity and referential integrity. How does SQL allow specification of these? Ans: Entity Integrity Rule- If the attribute A of relation R is a prime attribut
Differance between Open addressing and chaining for collision resolution ? In open addressing , proceeding from the occupied position specified by hash address the program che
Explain the Strategy of Database Planning ?
Which model is record based logical model? Network Modelis basically known as record based logical model.
What is nested relational model? The nested relational model is an extension of relational model in which domains might be either atomic or relation valued.
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