Q. W-timestamp(Q) denotes?

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Q. R-timestamp(Q) denotes?

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Q. A ________ ensures that any conflicting read and write operations are executed in timestamp order

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Q. The default timestamp ordering protocol generates schedules that are

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Q. State true or false: The Thomas write rule has a greater potential concurrency than the timestamp ordering protocol

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Q. Which of the following timestamp based protocols generates serializable schedules?

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Q. In timestamp ordering protocol, suppose that the transaction Ti issues read(Q) and TS(Ti)<W-timestamp(Q), then

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Q. In timestamp ordering protocol, suppose that the transaction Ti issues write(Q) and TS(Ti)<W-timestamp(Q), then

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Q. The _________ requires each transaction executes in two or three different phases in its lifetime

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Q. During __________ phase, the system reads data and stores them in variables local to the transaction.

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Q. During the _________ phase the validation test is applied to the transaction

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Q. During the _______ phase, the local variables that hold the write operations are copied to the database

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Q. Read only operations omit the _______ phase

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Q. Which of the following timestamp is used to record the time at which the transaction started execution?

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Q. Which of the following timestamps is used to record the time when a transaction has finished its read phase?

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Q. Which of the following timestamps is used to record the time when a database has completed its write operation?

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Q. State true or false: Locking and timestamp ordering force a wait or rollback whenever a conflict is detected.

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Q. State true or false: We determine the serializability order of validation protocol by the validation ordering technique

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Q. In _______ schemes, each write operation creates a new version of Q

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Q. If the first update is overwritten by a second, it is called as a _______ update

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