# Can there be a strict transaction that is not 2Phase?

I am confused about the definition of a strict transaction. What is the difference between a transaction that is strict and a transaction that is both strict and 2 phase?

Strictness Strictness ($\textsf{ST}$) is related to recoverability. Serializability ($\textsf{SR}$) is one of many consistency conditions of transactions, which is somewhat orthogonal to recoverability. 2PL is a protocol usually used to ensure serializability.
The answer is "Yes". For example, $e = r_1(x) \; w_2(x) \; w_2(y) \; c_2 \; r_1(y) \; c_1$. You can check that $e \in \textsf{ST} \land e \notin \textsf{SR}$.