How do you tell the system that a transaction is beginning -Technology

How do you tell the system that a transaction is beginning -Technology
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When a transaction begins, Oracle Database assigns the transaction to an available undo data segment to record the undo entities for the new transaction. A transaction ID is not allocated until an undo segment and transaction table slot is not allocated, which occurs during the first DML statement. A transaction ID is unique to a transaction and represents the undo segment number, slot and sequence number.
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Ms. Pari, a beginner in SQL is not able to understand the meaning of “Cancelling a Transaction”. Help her in understanding the same. -Technology

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Last Answer : What is the answer ?

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