In which scenario will you perform a user-managed incomplete recovery？（） when a table is dropped and stored in the Recycle Bin。 when a table is dropped and purged from the Recycle Bin。 when you are required to recover an existing table to its previous state。 when you are required to view all the versions of a row of an existing table between a specific time period。
封堵密封囊位置应避开（） 螺旋焊缝。 一切焊缝。 环形焊缝。 横向焊缝。
Which three elements can a job chain process involve？（） an event。 a schedule。 a program。 another chain。 a lightweight jo。
采购单位应对采购的材料和设备质量负责。必要时，应派有经验的技术人员（），负责监督检查材料、设备的质量状况。 技术指导。 驻厂监造。 参与生产制造。 建立质量体系。
You have performed an incomplete recovery because some important user’s schema is dropped and purged from the Recycle Bin. The current logs are sequenced 1005 and 1006. After performing the recovery， you issued the following statement： SQL>ALTER DATABASE OPEN RESETLOGS； What will be the resultant log sequence numbers？（） 0 and 1。 1 and 2。 1005 and 1006。 1006 and 1007。
Your test database is running in NOARCHIVELOG mode. What are the implications of this？ （）
