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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.
Question 1: a) What is the difference between a non-impact and impact printer? b) Which type of printer is generally used in a supermarket to print your receipt? Describe
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Draw an ER diagram that represents the information described below. Show all entity sets, relationship sets, primary keys, and the mapping cardinality of the relationship sets.
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