フリー問題

問題文

A transaction updates several rows in different tables. Which statement about how undo is organized for that transaction is correct?

選択肢

1. The database binds the transaction to one undo segment in the temporary tablespace and writes the prior values of every changed row there.
2. The database binds the transaction to one undo segment for each table it touches and writes the prior values of the rows of that table.
3. The database binds the transaction to one online redo log group and writes the prior values of every changed row there.
4. The database binds the transaction to one undo segment in the current undo tablespace and writes the prior values of every changed row there.