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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).
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brief history,definition,current trends and future trends if any of data fragmentation
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Assume that you are responsible for selecting a new DBMS product for Sohar Hospital
Performance of Various Concurrency Control Mechanisms
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