shreyas.darwhatkar@hotmail.com wrote:

Can we consider the below schedule is a valid strict 2PL example.

xl1(x),w1(x),sl2(x),r2(x),c1,c2,ul1(x),ul2(x)

xl1(x),w1(x),sl2(x),

this is not following proper locking protocol

tx1 has an EXCLUSIVE lock on x, but TX2 is requesting a lock on x

so this is not even 2PL, which is the first requirement for strict 2pl

shreyas.darwhatkar@hotmail.com wrote:

xl1(x),w1(x),c1,ul1(x),sl2(x),r2(x),c2,ul2(x)

Now is it a valid example for strict 2PL

Yes.