Consider the following log. ⟨T1 start⟩ ⟨T1, A, 10, 50⟩ ⟨T1, B, 20, 70⟩...
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Consider the following log.
⟨T1 start⟩ ⟨T1, A, 10, 50⟩ ⟨T1, B, 20, 70⟩ ⟨T1 commit⟩ ⟨T2 start⟩ ⟨T2, B, 70, 60⟩ ⟨T2, C, 30, 40⟩ ⟨T2, B, 70⟩⟨T2, C, 30⟩⟨T3 start⟩ ⟨T3, C, 30, 90⟩ ⟨T3 commit⟩ ⟨T4 start⟩ ⟨T4, A, 50, 100⟩ (crash here)
After recovery using basic WAL, the final on-disk value of B will be .
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