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Dirty Reads: T10 reads a value which is updated by T9. This update has not been committed and T9 aborts.
T9
T10
Value of x old value =
200
UPDATE X
500
READ X
ROLLBACK
?
Here T10 reads a value that is updated by transaction T9 that has been aborted. Therefore T10 has read a value that would never exist in the database and hence the trouble. Here the difficulty is primarily of isolation of transaction.
Adding Redundant Associations for Efficient Access The expression redundant association means using "duplicate association for proficient access". While analysis, it is not a
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What is a recovery scheme? An integral part of a database system is a recovery scheme that can restore the database to the reliable state that existed before the failure.
Normal 0 false false false EN-US X-NONE X-NONE
write a database program for concurrency transaction in a bank
Object Oriented model :An object has values stored in instance variables within the object. An object also has bodies of code that execute on the object. These bodies of code are
What is multiplicity in the associations? Give an example to explain multiplicity? Multiplicity in association indicate number of objects participate in any relationship. For
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