[单选] You work as a database administrator for Supportcenter.cn. You received the following error while working on your database： ORA-01555： snapshot too old ，In which situation would you receive such an error？（）

A . You performed rollback after commit.
B . If a log switch occurs in your database.
C . Thearchiverfails to generate an archived log file.
D . Instance recovery fails to find one of the redo log files.
E . A long-running query is unable to get read-consistent image.
F . If you perform manual undo management operations in auto mode.

用剖切平面把物体完全剖开后所得到的剖视图称为（）。局部剖视图。局部视图。全剖视图。端面图。创业者打算购买一家现存企业之前，必须对其进行全面的审查，主要包括（）。产品质量。市场状况。财务状况。出售原因。举世闻名例说明激励理论在人事管理中的应用？合格的施工单位应满足（）等主要条件。具有与工程项目相适应的资质。项目经理应具有与本工程相适宜的资质。施工组织设计和施工方法措施切实可行。技术力量及机械设备能满足本工程施工的要求。有工程垫资的资金实力。 Which of the following advisors is run in every maintenance window by the auto-task system?（） The Memory Advisor。 The SQL Tuning Advisor。 The Undo Advisor。 The SQL Access Advisor。 You work as a database administrator for Supportcenter.cn. You received the following error while working on your database： ORA-01555： snapshot too old ，In which situation would you receive such an error？（）

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[单选] You work as a database administrator for Supportcenter.cn. You received the following error while working on your database： ORA-01555： snapshot too old ，In which situation would you receive such an error？（）

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