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问题:

[单选] Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled()

A . It is the time period after which the undo data becomes obsolete.
B . It is the time period after which the committed undo data would be transferred to a temporarytablespace.
C . It is the minimum time period up to which the committed undo data would be retained if free undo spaceis available.
D . It is the time period after which the undo data is transferred to the Flash Recovery Area to provide readconsistency.

男性,42岁。因足底被刺伤后出现全身肌肉强直性收缩阵发性痉挛,诊断为破伤风。冲洗此患者伤口所用的溶液为() 3%碘酊。 5%盐水。 3%双氧水。 10%硝酸银溶液。 生理盐水。 You executed this command to create a password file: $ orapwd file = orapworcl entries = 10 ignorecase = N Which two statements are true about the password file?() It will permit the use of uppercase passwords for database users who have been granted the SYSOPER role.。 It contains username and passwords of database users who are members of the OSOPER operating system group.。 It contains usernames and passwords of database users who are members of the OSDBA operating system group.。 It will permit the use of lowercase passwords for database users who have granted the SYSDBA role.。 It will not permit the use of mixed case passwords for the database users who have been granted the SYSDBA role.。 教育社会学的演变主要经过哪几个阶段()。 规范性时代。 证验性时代。 解释的新教育社会学时代。 成熟时代。 采用“()”结构的新时期话剧是《陈毅市长》。 空载特性曲线是发电机基本特性曲线之一,用它可以求发电机的() 电压变化率。 励磁绕组是否有杂间短路。 未饱和的同步电抗。 功率因数。 Which statement is true about the UNDO_RETENTION parameter when retention guarantee is notenabled()
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