What type of transaction isolation would you choose to ensure data accuracy during simultaneous credit and debit transactions on an account?

To ensure data accuracy when simultaneously crediting and debiting funds in an account, it is best to choose the transaction isolation level Serializable.

This level provides complete transaction isolation, preventing issues such as:

• dirty reads
• non-repeatable reads
• phantom reads

In the context of financial operations, this is important to avoid balance desynchronization during parallel changes.

If Serializable is too costly in terms of performance, you can consider the Repeatable Read level, but it does not guarantee the absence of phantom reads, which can be critical.

Example of setting the isolation level in JDBC:

connection.setTransactionIsolation(Connection.TRANSACTION_SERIALIZABLE);