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If the system does support some locking mechanism

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Reference no: EM132361585

Consider the following two data fields V1 and V2. The initial values of A and B are Displayed inside the box assigned for V1 and V2

V1: 100

V2: 140

Order of Processing of two Programs A & B - both are allowed to access to V1 and V2 For potential update, and at this moment the database system does not support any locking Mechanism.

1. Program B reads value from V1 into its local variable BV1

2. Program A reads value from V2 into its local variable AV2

3. Program A reads value from V1 into its local variable AV1

4. Program B subtracts 50 from BV1 and write its content back to V1

5. Program A adds 40 to AV2 and write its content back to V2

6. Program B reads value from V2 into its local variable BV2

7. Program B subtracts 60 from its local variable BV2

8. Program A add 20 from its local variable AV1

9. Program A writes the content of AV1 back to V1

10. Program B writes the content of BV2 back to V2

a) What is the final value in V1 and V2?

V1:

V2:

b) If the system does support some locking mechanism, then what shall be the final content of V1 and V2?

V1:

V2:

Reference no: EM132361585

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