Consider the case of immediate database approach and assume that, after a crash, the log contains the following records: LSN Object Old Value New Value Transaction LO01 T1 (starts) P. 400 500 LO02 T1 300 400 LO03 T1 LO04 T2 (starts) LO05 T1( commits) LO06 T3 (starts) 100 200 LO07 T2 700 800 LO08 T3 LO09 T4 (starts) L010 T3 (commits) 800 900 L011 T4 i) Which transaction(s) will be redone during recovery process? ii) Which transaction(s) will be undone during recovery process? iii) What will be the value of data item 'P' and 'T' after the recovery? RS

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A:

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