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Briefly describe concurrency execution?
Lock - based protocols
Locks
There are several modes in which a data item may be locked in this section we restrict our attention to two modes
Ø Shared
Ø Exclusive
T1 : lock - x(B );
read(B);
B:=B-50;
write(B);
unlock(B);
Lock-x(A);
read(A);
A:=A+50;
write(A);
unlock(A).
Define the Division Operation of Relational Algebra Let R be a relation comprising attributes (A1,...Ap,Ap+1,...An) and S comprising attributes (Ap+1,...An) DEF: Division
My cut off date is very soon in a Database subject and i dont know how to solve anything in it
WHAT IS DBMS
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Define Join and Outer Join and differentiate between them. Ans: Join - It generates all the combinations of tuples from two relations which satisfy a join condition. Oute
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