Help me solve this database question.

timer Asked: Nov 26th, 2015

Question description

In a distributed database environment site S1 has data items A and B and site2 has items C and D. Four transactions are running in the system such that T1 and T2 are global and T3 and T4 are local with following histories

H1 : R1(A) W3(A) W3(B) R2(B)

H2: W4 ( C ) R1( C) R2(D) W4(D)

Check if there is a.

A local deadlock

b. A global deadlock

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