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Need some help , In this question W3(B) , W2(B) is allowed in TWR bit confuse between option b and d . Plz help me which option is correct between b and d with proper justification.  

 

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In timestamp based protocol we execute transaction serially based on the time stamp it assigned.

For option B (T1,T2,T3)=(20,10,30) which means we first execute T2, then T1 , then T3 at last.

Given schedules:-

If we follow option B:-

This would be as we see the actual schedule the final write for B(W(B)) must be done T2 but if we follow option option B it is done by T3 which is inconsistent.

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yes
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edited by

got it, thanks @Kabir5454

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