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In crash recovery in the checkpoint mechanism. Till the last checkpoint for all committed transactions redo will be done and all uncommited transactions undo is done. Can anyone explain what is the reason behind it ?
asked Jan 9, 2019 in Databases amitqy 156 views
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Are they in the syllabus? I believe not since nothing is specified in the syllabus but I've seen questions in made easy test series regarding undo and redo list. $(Start, T_4); (Write,T_4,y,2,3); (Start,T_1);(Commit,T_4);(Write,T_1,z,5,7)\\ (Checkpoint)\\ (Start,T_2);(Write,T_2,x,1,9);(Commit,T_2);(Start,T_3);(Write,T_3,z,7,2);\\ (Crash)$ Give contents of Undo and Redo list.
asked Dec 8, 2017 in Databases Tuhin Dutta 602 views
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