whether serial schedules considered under concurrent schedules?
yes, every serial schedule is a concurrent schedule, but every concurrent schedule is not serial schedules.
But note that some of the concurrent schedules ( which are not serial schedules ) are equivalent to serial schedules in terms of either conflict or view
i didn't get the question exactly, i hope your doubt is
whether more than a serial schedule is considered as conflict serializable schedule to given schedule ?
let take this schedule S: R1(A) , R2(B), R3(C)
what are the conflict-equivalent schedules?
1) T1 → T2 → T3
2) T1 → T3 → T2
3) T2 → T1 → T3
4) T2 → T3 → T1
5) T3 → T1 → T2
6) T3 → T2 → T1
Every Schedule is serial schedule only. all these schedules are conflict equivalents schedules to given schedules.
whether more than a serial schedule is considered as conflict serializable schedule to given serial schedule ?
if your question is, exactly what you written
whether a serial schedule is considered as conflict serializable schedule
conflict serializable means, it is equivalent to some serial schedule. (then your question is invalid)