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Consider the following database schedule with two transactions, T1 and T2.
S = r2(X); r1(X); r2(Y); w1(X); r1(Y); w2(X); a1; a2;
where ri(Z) denotes a read operation by transaction Ti on a variable Z, wi(Z) denotes a write operation by Ti on a variable Z and ai denotes an abort by transaction Ti . Which one of the following statements about the above schedule is TRUE?
S is non-recoverable
S is recoverable, but has a cascading abort
S does not have a cascading abort
S is strict
This question is part of this quiz :
Transactions and concurrency control,GATE-CS-2016 (Set 2),DBMS GATE CS PYQ QUIZ,Transaction & Concurrency Control GATE CS PYQ Quiz
