Does Oracle roll back the transaction on an error?

Answer

"User process" in this context is referring to the process running on the client machine that creates the connection to Oracle. In other words, if you are using Application A (SQL*Plus, TOAD, etc.) to connect to Oracle, the user process is SQL*Plus, TOAD, etc. If that user process dies while you were in the middle of a transaction, that transaction will be rolled back. This will happen as soon as PMON discovers that the client has died which may take a bit of time-- it isn't always trivial for Oracle to distinguish the failure of a user process from a user process that just isn't issuing commands at the moment.

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