when does a transaction begin?

In Oracle Database 12c, when does a transaction begin?

In Oracle Database 12c, when does a transaction begin?

A.
when a transaction ID is allocated for it.

B.
when a user explicitly issues a “begin” statement

C.
when a transaction is assigned to an available undo data segment to record undo entries for the new
transaction

D.
when the first executable SQL statement is encountered

Explanation:
https://docs.oracle.com/database/121/CNCPT/transact.htm#CNCPT038



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