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Locks in Transations
Samujjal Das
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Dec 15, 2016
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Samujjal Das
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Dec 15, 2016
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Aravind Adithya 1
asked
in
Databases
Jan 1, 2019
97
views
DBMS-locks
Are these stmts true A conflict serialisable schedule is recoverable but may not be cascadeless Schedules allowed under 2pl are necessarily recoverable and conflict serialisable Strict and rigorous 2 pl guarantee recoverable and cascadeless behaviour. Both of them suffers from deadlock and starvation. Timestamp model doesnt suffer from deadlock but suffers from starvation
Aravind Adithya 1
asked
in
Databases
Jan 1, 2019
by
Aravind Adithya 1
97
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1
vote
1
vote
2
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2
LavTheRawkstar
asked
in
Databases
Mar 16, 2017
1,065
views
write locks are released after last operation of transaction but before its commit ! explain
Somebody please explain this i am not able to understand please given an example of transaction or explain in hindi what the question and answer is please explain somebody please Here i am posting the Entire ... please explain which choice is correct and which is wrong I am not able to understand it.
LavTheRawkstar
asked
in
Databases
Mar 16, 2017
by
LavTheRawkstar
1.1k
views
databases
transaction-and-concurrency
0
votes
0
votes
1
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3
debanjan sarkar
asked
in
Databases
Jun 19, 2016
1,616
views
SHARED AND EXCLUSIVE LOCKS
In Navathe the operations of read/write or shared/exclusive locks are given below.... In the unlock(X) operation...if no.of reads = 0...then lock(X)="unlocked"; and wake up one of the waiting transactions if any My question is if it is ... a queue? We can have a read lock even if other transaction is holding a read lock on same data item......Please explain
debanjan sarkar
asked
in
Databases
Jun 19, 2016
by
debanjan sarkar
1.6k
views
databases
0
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0
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0
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4
radha gogia
asked
in
Databases
Aug 23, 2015
101
views
why are IS and S locks compatible ?
if a node R1 is in IS mode then it may be a possibility that some node below it is in exclusive lock then how can we lock R1 in S mode since if I apply S on it that means I am trying to lock every node below R1 in S mode but since some node ... R1 is in IS mode so than how can a transaction come and lock R1 in shared mode i.e. why are IS and S locks compatible ?
radha gogia
asked
in
Databases
Aug 23, 2015
by
radha gogia
101
views
databases
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