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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).
What is conceptual schema? The schemas at the view level are known as subschema that describe dissimilar views of the database.
Give some encryption techniques? A) DES B) AES C) Public key encryption
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Draw an ER diagram that shows the organization of a simple student database. The database captures the information about letter grades obtained by university students who enrolled
how to implement mid square hashing?
why shadow copy technique is used?
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