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Cascading Aborts

Recall the earlier non-recoverable schedule: 

T1:        R(X)  W(Y)  C
T2:  W(X)                 A

To make it recoverable requires:

  • delaying T1's commit until T2 commits
  • if T2 aborts, cannot allow T1 to commit 

T1:        R(X)  W(Y) ...   C? A!
T2:  W(X)                 A

Known as cascading aborts (or cascading rollback).