[单选] What does the SCN represent?（）

A . The system change number, which is a point in time relative to transactions within a given database.
B . A number that represents time. Thus, at 1300 hours, the SCN is the same on all databases.
C . The security change number, which represents the security code that is needed to access any database structure.
D . A conversion factor that converts internal database time to external clock time.
E . UTC time in the database, providing a standardized way of tracking time in Oracle.&e

按照《水利工程建设监理工程师注册管理办法》，未取得继续教育合格证书的，不予监理工程师注册。《水电站大坝安全管理规定》有关大坝安全运行的主要规定中规定（）负责水电站大坝安全生产的监督管理，参加水电站建设工程竣工验收。电监会。水监会。水利部。电力部。 Following a server crash, the automatic recovery of InnoDB fails. How would you begin to manually repair the InnoDB tables?（） Start the server with the – innodb_recover_options option set to FORCE。 Start the server with the – innodb_force_recovery option set to a non-zero value。 Start the server as usual, and then execute the REPAIR TABLE command。 Start the server as usual, and then execute the CHECK TABLE command。在偏摆仪上检查主轴精度应注意顶尖顶住顶尖孔时不可用力过紧，也不可（）。 Which Tivoli application has a predefined X-Agent available？（） IBM Tivoli Storage Manager。 IBM Tivoli Enterprise Console。 IBM Tivoli Configuration Manager。 IBM Tivoli System Automation Manager。 What does the SCN represent?（）

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[单选] What does the SCN represent?（）

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