TIME 0 1 2 3 4 5 6 7 8 (a) Given the following transaction sequence,...
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TIME 0 1 2 3 4 5 6 7 8 (a) Given the following transaction sequence, complete the supplied document by clearly indicating what locks are present at each of the indicated times (Time 0 to Time 9). 9 Cell entries must have the form: ● S(Tn) - for a shared lock by Tn, • X(Tn) - for an exclusive lock by Tn or ● Tn wait Tm - for a wait of Tn due to Tm (where n and m are transaction numbers). TRANS T1 T1 T2 T2 T3 T2 T1 T3 T2 T2 ACTION UPDATE A UPDATE B READ C READ D UPDATE A UPDATE C ROLLBACK UPDATE C UPDATE B UPDATE A In the document indicate: A B Does a deadlock exist in this transaction sequence? ● Explain why you came to this conclusion. C D [ 5 marks] TIME 0 1 2 3 4 5 6 7 8 (a) Given the following transaction sequence, complete the supplied document by clearly indicating what locks are present at each of the indicated times (Time 0 to Time 9). 9 Cell entries must have the form: ● S(Tn) - for a shared lock by Tn, • X(Tn) - for an exclusive lock by Tn or ● Tn wait Tm - for a wait of Tn due to Tm (where n and m are transaction numbers). TRANS T1 T1 T2 T2 T3 T2 T1 T3 T2 T2 ACTION UPDATE A UPDATE B READ C READ D UPDATE A UPDATE C ROLLBACK UPDATE C UPDATE B UPDATE A In the document indicate: A B Does a deadlock exist in this transaction sequence? ● Explain why you came to this conclusion. C D [ 5 marks]
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Understanding the Question Locking Its a mechanism to control concurrent access to data items in a database ensuring data integrity and consistency Transactions They represent a unit of work that must ... View the full answer
Related Book For
Income Tax Fundamentals 2013
ISBN: 9781285586618
31st Edition
Authors: Gerald E. Whittenburg, Martha Altus Buller, Steven L Gill
Posted Date:
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