Lec-83: Conflict Equivalent Schedules with Example | Transaction concurrency and Control | DBMS
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- Опубліковано 19 вер 2024
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If any two schedules generate the same result after their execution, then they are called as result equivalent schedules.
This equivalence relation is considered of least significance.
This is because some schedules might produce same results for some set of values and different results for some other set of values.
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Jaha pe adjacent non conflict pairs hoge waha pe position change
Conflict me no position change
And S ka conflict equivalence S' = serializable
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nice video.
Nicely explained. What if both schedules don't have any conflict operations among their transactions T1 T2 (transactions working on different data item) can we say these schedules are conflict equivalent?
Thank you
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In this video, mind it , you have mentioned swapping of position but again mind it that it should be the swapping in time not the position. Please think it carefully. Swapping in position and swapping in time are different thing. I encourage your lecture after all.
Thankyou sir love you❤
sir I think , you have made a mistake in the beginning example , -----> we don't have w(B) in first transaction , but in non-conflict schedules -you have written w(B) -R(A) , and you have missed w(a)-R(A) , I think we need to replace w(a)-R(A) with w(B) -R(A) ,correct me if I am wrong.
Thank you!
Thankyou so much sir
For any schedule S1 if there exist conflict equivalent schedule S2 and if S1 is serializable then we can say that S2 is also serializable.
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consider the following schedule s of transaction T1,T2,T3 . T1:R(X),W(Y);T2:R(X),W(Y);T3:W(X),W(Y)
identify the number of conflict equivalent serial schedule of s
please make videos in english too there are peoples around the world who want to learn from you.
Sir how can r(a) & r(a) be non conflict whereas w(a) and w(a) is conflict??
Because it's just reading..like checking train status..nobody can change..so no conflict..
But write means change like booking seat in same train same time same date..it can be a problem
Sir, if we have two adjacent pairs and one pair is non conflict second is conflict. Then , we can swap non conflict or not?
If there is no swapping happened then what should we declare that schedule??
Sir here r(a) and r(a) are non conflict pairs but w(a) and w(a) conflict pairs sir how it is possible sir..?
I dont know hindi but somehow managed to understand, I understood the whole thing but didn’t understand what to do when there are no adjacent non conflicting pairs. Are we supposed to change the positions within same transaction?
Last day with this dbms
One doubt sir.
How to do in case of 3 transactions?
What If all those marked pairs at 6:10 would be non conflicting? Such as w(A) R(B) and then W(A)
Precedence graphs of two schedules having the same transactions and same operations are isomorphic. Are they conflict equivalent?
sir ji plz upload further video of transaction as soon as
Sir i have a doubt .... there w(a) and r(a) are adjacent conflict pair.. then what happened.?
Thx
How to make a non-conflict serializable schedule to conflict serializable schedule
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let's say the following is a part of some schedule(involving 2 transactions only):
T1: w(x) T1: commit T2: w(x).
Is this a conflicting pair ??
So basically I am asking how do we handle commit/abort operations (if present) in the schedule while checking for conflict serializability? Or do we have to ignore these operations?
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Watch this video and you would get it clear
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Sir how to find how many non serial schedule??????
Sir, Is there any particular method for checking the non-conflict pair? like top to bottom or bottom to top?
did you find the answer and i want to know also is there any rule to check for non conflicting pair , only adjacent or one by one each instruction .
how to convert from conflict serializable into serial, for three transactions, how to select the adjacent pairs, and how to manage the swaps, with conflicting pairs, if anyone knows this, kindly reply
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Can u narrate in english
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sure
Questions kese ate h sir is topic pr
R(A) W(A) and W(A) R(A) are this conflict equivalent
Yes
7:19
why R(A) = R(A) non conflict ?????????????????
Because read-read operations has no issues only issues can be made in write read , read write and write write operations
What language are you speaking ? is it english or something else?
It's Hindi + English
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Watching 30 min before exam
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thanks sir please can u solve the ugc net July 2018 of 65 number question...
Dev Manus
T1 - R(A) W(A)......... R(B) fail
T2 - R(A) W(A)
Sr tell me still T2 will also abort?
2nd case
T1 - R(A) W(A) commit......... R(B) fail
T2 - R(A) W(A)
So tell sr t2 will abort Or not
Noone teaches better than you
What language is it?
hindi
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