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What are the types of reference?explain it with suitable examples?
Object oriented language given the ability to refer the object attribute of the type can be referred to the specified type. We can describe the type dept with a field name and a field head which is reference to the type person and a table dept of the type dept as followed
Create type dept(
Name varchar(20),
Head ref(person)scope people
)
Create table dept of dept
The table definition must state that the reverence is derived and must still state a self referential attribute name. When interesting a tuple for dept we can then use
Insert into dept
Values('CS','john')
Explain the uses of deadlock It will lead to deadlock since this is the only place where incoming acknowledgements are processed. Without this code, sender will keep timing ou
Define what Immediate database modification technique uses? Ans: Both undo and redo.
what do you mean by consistency in rdbms?
Physical Database Design Issues The database design includes the process of logical design with the use of E-R diagram, normalisation, etc., followed by the physical design.
Differentiate between a subquery and a join If we need to acquire information from one or more tables after that either subquery or join can be used. If the columns which are t
The Concurrent Transactions Almost every commercial DBMS support multi-user environment. Therefore, allowing multiple transactions to proceed concurrently. The DBMS must make
employee(empid,empname,dept,telno,mobno, add,sssno,tinno,WEdates,WEcomp,WEadd,WEpos,WEres) this is a employee record which is need to be normalize.the WE means work experience
Performance of Various Concurrency Control Mechanisms
Project Description: This is going to be a School portal to handle each activities in school such as, School fees payment, online registration and every other payment, course re
3NF Normal Form A relation schema R is in 3NF if it is in 2NF and for each FD X A either of the following is true X is a Super-key of R. A is a prime attribute of R
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