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Data Concurrency

 
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In EJB for managing data consistency, Which database mechanisms provides data concurrency by preventing "lost updates?
 
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Answer to that is the isolation levels.

Bhagvan K
SCJP, SCJA part I , IBM 483
 
Ram Dhan Yadav K
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The given choices are
a) User security b) Buffer cache c) Log files d) Locking facilities e) Rollback segments
What do you think is the right answer? Is it d?
 
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Yes it is D
 
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