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The strict two-phase locking (S2PL) class of
schedules is the intersection of the 2PL class with the
class of schedules possessing the Strictness property.
To comply with the S2PL protocol a transaction
needs to comply with 2PL, and release its write
(exclusive) locks only after it has ended, i.e., being
either committed or aborted. On the other hand, read
(shared) locks are released regularly during phase 2.
Implementing general S2PL requires explicit support
of phase-1 end, separate from transaction end, and no
such widely utilized product implementation is
known.
S2PL is a special case of 2PL, i.e., the S2PL class is a
proper subclass of 2PL
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ADVANTAGE: It produces only cascadeless schedules, recovery is very easy.DISADVANTAGE: The set of schedules obtainable is a subset of those obtainable from plaintwo phase locking, thus concurrency is reduced
Give an example where strict 2 phase locking is followed but the resulting schedule leads to deadlock Explain why the 2PL being followed here is strict and explain why there is deadlock?
T1: Write X // This acquires an exclusive lock: LockXT2: Write Y // This acquires an exclusive lock: LockYT2: Read X // This attempts to acquire a shared lock on X, but since X is locked already by T1, T2 is subsequently blocked by the system until X is freed.T1: Read Y // This attempts to acquire a shared lock on Y, but since Y is locked already by T2, T1 is subsequently blocked by the system until Y is free.T1: Commits // This should release all locks held by T1.T2: Commits // This should release all locks held by T2.* Note that "block" means the transaction will not proceed until the specified condition is met.Now, since T2 is waiting for T1 to free X AND T1 is waiting for T2 to free Y, we get into a cycle of condition checking. These conditions will never be met because both transactions are waiting for the other one to do something, in order to proceed itself. Therefore we have a deadlock between T1 and T2 trying to access the shared resources X and Y.The Wikipedia article on Two-phase locking may help you understand why this is strict 2-phase locking and what 2-phase locking is.
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Mrs. Trunchbull mistreated her students in various ways, including using fear and intimidation, imposing strict rules and punishments, and physically abusing them by throwing, shaking, and locking them in a spiky cupboard called "The Chokey."
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A strict inequality.A strict inequality.A strict inequality.A strict inequality.
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No because you can not "strict".
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No because you can not "strict".
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Not strict in the life of a particular country. They are strict in all countries. Iranian people inthe region are less strict.
Is Zeus strict?
Yes, very strict.
How can use a sentences strict?
he was very strict about it
