[单选] Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（）

A . Archive log generation is suspended until the tablespaces are taken out of hot backup mode.
B . Datafiles are not written to during hot backups.
C . Changes to the database are cached during the backup and not written to the datafiles to ensure that the datafiles are consistent when recovered.
D . The datafile headers are not updated during the backup.
E . The way data is written to the online redo logs is unchanged during the backup.

美国独立战争取胜的原因包括（）。①美国军民的顽强抵抗②美国有武器装备等多方面的优势③华盛顿卓越的军事指挥才能④法国等国家的援助⑤英国陷于欧洲战争，难以自拔 ①②③。 ②③④⑤。 ①③④。 ②③④。试以教育社会学理论论述你未来打算怎样扮演教师角色（或至少是孩子的父母角色）。 ISDN是指（）电话业务网。电视业务网。手机业务网。综合业务数字网。 Given: Which code fragment, inserted at line 23, allows the code to compile?（） df = new DateFormat();。 df = Date.getFormat();。 df = date.getFormat();。 df = DateFormat.getFormat();。 df = DateFormat.getInstance()。变更工作负责人，应由（）填写。工作负责人。工作票签发人。工作票许可人。 Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（）

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[单选] Which of the following statements is true when the database is in ARCHIVELOG mode and tablespaces are in hot backup mode？（）

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