Answer / shraddha

Connection.setTransactionIsolation (level)

TRANSACTION_READ_UNCOMMITTED Allows dirty reads, non-
repeatable reads, and phantom reads to occur.

TRANSACTION_READ_COMMITTED Ensures only committed data
can be read.

TRANSACTION_REPEATABLE_READ Is close to
being "serializable," however, "phantom" reads are possible.

TRANSACTION_SERIALIZABLE Dirty reads, non-repeatable
reads, and phantom reads are prevented. Serializable.


A "phantom" read occurs when one transaction reads all rows
that satisfy a WHERE condition, and a second transaction
inserts a row that satisfies that WHERE condition, the
first transaction then rereads for the same condition,
retrieving the additional "phantom" row in the second read.

In addition, JDBC defines an additional constant,
TRANSACTION_NONE, which is used to indicate that the driver
does not support transactions.

Answer / arghya

To avoid potential conflicts that can arise when two transaction are operating on a database at the same time, we use some transaction isolation level using conn.setTransactionIsolation().

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