In ________ no two aborts occur unless two concurrent transactions update the same data item.(a) Multiversion scheme(b) Timestamp protocol(c) Lock based protocol(d) Snapshot isolationI have been asked this question in a job interview.My question is taken from Multiversion Schemes, Snapshot Isolation in portion Concurrency Control of RDBMS

In ________ no two aborts occur unless two concurrent transactions upd

1.	In ________ no two aborts occur unless two concurrent transactions update the same data item.(a) Multiversion scheme(b) Timestamp protocol(c) Lock based protocol(d) Snapshot isolationI have been asked this question in a job interview.My question is taken from Multiversion Schemes, Snapshot Isolation in portion Concurrency Control of RDBMS
Answer» The correct OPTION is (d) Snapshot isolation Easy EXPLANATION: In snapshot isolation no TWO aborts OCCUR unless two concurrent transactions update the same data item. This makes snapshot isolation attractive but it does not ensure serializability.

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