check for seralizablity HGURE 20.5 TWO serialization graphs. has many topological sorts, and hence there are many conflict-equivalent serial schedules of its transactions. Two of these schedules are T1T2T3T4T5T6T7 and T1T3T5T2T6T7T4 The sertalization graph in Figure 20.5(b) is obtained from the graph of

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check for seralizablity

HGURE 20.5 TWO serialization graphs. has many topological sorts, and hence there are many conflict-equivalent serial schedules of its transactions. Two of these schedules are

T_{1} T_{2} T_{3} T_{4} T_{5} T_{6} T_{7}

and

- T_{1} T_{3} T_{5} T_{2} T_{6} T_{7} T_{4}

The sertalization graph in Figure 20.5(b) is obtained from the graph of Figure 20.5(a) by adding the edge

T_{7} \to T_{2}

. It corresponds to a nonserializable schedule because of the cycle

T_{2} + T_{5} \to T_{7} \to T_{2}

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