Which of the following allows phantom read in JDBC, connection class?

A) TRANSACTION_READ_UNCOMMITTED
B) TRANSACTION_READ_ COMMITTED
C) TRANSACTION_SERIALIZABLE
D) TRANSACTION_REPEATABLE_READ.
Explanation: A phantom read is where one transaction reads all rows that satisfy a WHERE condition, a second transaction inserts a row that satisfies that WHERE condition, and the first transaction re-reads for the same condition, retrieving the additional 'phantom' row in the second read
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mcawal

  • Apr 6th, 2006
 

Option A,B,D isolation levels Does not prevent phanto read problem

Option C isolation level prevent the Phantom read problem

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charankk

  • May 2nd, 2008
 

Guys ...do not give any wrong answers,If you know very well then answer.

Here to avoid the phatom read ,we will go for TRANSATION_SERIALIZABLE ,Which blocks the records in row level .But this affects performance drastically .
Hence the answer is  "C "

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sanky

  • Jun 3rd, 2014
 

Charankk, please read question carefully. We need ans for which allows phantom read. We dont need ans for which does not allows. Ans is A,B,D

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