Question

I execute sql queries as transactions using jdbi inTransaction() function. I would like to know how/what type of locking mechanism is used internally. additionally, is the whole table locked during the transaction or just the record that has to be updated?

Answer 1

The transaction is purely at the database level. It will use the default isolation level for the database/connection unless overridden.

If you are using the inTransaction(…) method which accepts a callback, there is a form of that function which allows for you to set the isolation level:

<ReturnType> ReturnType inTransaction(TransactionIsolationLevel level,
                                      TransactionCallback<ReturnType> callback)

-Brian