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undo_retention

undo_retention

undo_retention

undo_retention

1

You can use UNDO_RETENTION to satisfy queries that require old undo information to rollback changes to produce older images of data blocks .

你可以用 undo_retention 来满足这样一个疑问 ----用旧的撤销信息来回滚改变，以制造数据块的旧镜像。

2

It advises administrators in setting UNDO_RETENTION appropriately to avoid the age-old 'snapshot too old' problem .

它为管理员适当地设置 UNDO_RETENTION 提供建议，以避免快照过于陈旧的问题。

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