May 2024
Intermediate to advanced
325 pages
12h 2m
English
Content preview from Distributed Database Systems, 1st Edition by Chhanda Ray
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Distributed Database Systems
Example 7.5
The phantom read problem is illustrated below.
T1: read range [X – Y]
T2: insert Z, X < Z < Y
T2: end transaction
T1: read range [X – Y]
In this case, when transaction T1 performs an operation depending on a criterion, transaction T2
inserts a new tuple Z satisfying that criterion. Now, if the transaction T1 performs the same opera-
tion again, the result will be different. Hence, Z is a “phantom” data item.
Durability. Durability refers to the fact that the effects of a successfully completed (committed)
transaction are permanently recorded in the database and will not be affected by a subsequent fail- ...
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