Problems with Basic 2- Phase Locking Protocol | Concurrency Control

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Комментарии
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Thank you very much, sir
Your lectures are really informative. With your tutorials, I am able to recapitulate my subject even after 6 months gap(due to the corona pandemic)

ramnisanthsimhadri
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im confused in the cascading problem, you said in the growing phase, there is only lack action could happen isn't it? but in the example, there are unlocks over there

harryzhong
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In the example for illustrating cascading roll back, how come the condition for simple 2P lock is satisfying when in T1 - after X-L(A) there is U(A) and in T2 again there is XL(A). As once the unlocking starts no more locking can be allowed in a schedule.

i am confused in this. Can anyone please help me to get this correctly??

akashchowdhury
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Cant we downgrade/upgrade lock to reduce unnecessary waiting?

yashabhyankar
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sir, if shared lock is already exist on a data item, can i apply exclusive lock on this same data item??

subhajitkhan
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Sir, Can you tell real world example for this?

shasha