Phân tích tư tưởng của nhân dân qua đoạn thơ: Những người vợ nhớ chồng… Những cuộc đời đã hóa sông núi ta trong Đất nước của Nguyễn Khoa Điềm
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Allocation of a Rollback SegmentWhen a transaction begins, a rollback segment must be assigned to this transaction. A transaction can request a specific rollback segment using the following command:SET TRANSACTION USE ROLLBACK SEGMENT rollback_segmentIf no such request is made, the Oracle server chooses the rollback segment with the fewest transactions and assigns it to the transaction.Using ExtentsTransactions use extents of a rollback segment in a sequential, circular fashion, moving from one to the next after the current extent is full. A transaction writes an entry to its current location in the rollback segment and advances the current pointer by the...
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Manually Managing Undo Data (Rollback Segments)
