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[多选] Which three statements are true about adaptive SQL plan management?()

A . It automatically performs verification or evolves non-accepted plans, in COMPREHENSIVE mode when they perform better than existing accepted plans.
B . The optimizer always uses the fixed plan, if the fixed plan exists in the plan baseline.
C . It adds new, bettor plans automatically as fixed plans to the baseline.
D . The non-accepted plans are automatically accepted and become usable by the optimizer if they perform better than the existing accepted plans.
E . The non-accepted plans in a SQL plan baseline are automatically evolved, in COMPREHENSIVE mode, during the nightly maintenance window and a persistent verification report is generated.

在常用的数据控件中,只需指定DataSource而不需指定DataField的控件有哪些? 有一台Y/Y-12接线的变压器,当低压侧BC相短路时,判断下列()正确。 IB=IC,IA=0。 IA=IB=IC。 IA=IB,IC=0。 You work as a database administrator for Certkiller .com. According to your backup strategy, you performed an incremental level 0 backup of your database. Which statement regarding this backup is true?() The backup is similar to image copy.。 The backup contains all used data blocks.。 The backup contains only unused data blocks.。 The backup contains all data blocks changed since the last incremental level 1 backup.。 You are at the client site working with a WebLogic Administrator who has to type Username and Password each time he/she starts an instance og Oracle WebLogic server and is quite annoyed by it. Please suggest a secure and optimal way to reduce the typing of username passwod during server startup ()  Since Boot Identity file for server doesn’t exist, you recommend creating a script file that can automate the task of entering username and password。  Since Boot Identity file for server doesn’t exist, you recommend reinstalling the server。  Since Boot Identity file for server doesn’t exist, you recommend creating one as this file is referred for credentials。  Since Boot Identity file for server doesn’t exist, you recommend logging a support ticket with Oracle。 教师为本。 Which three statements are true about adaptive SQL plan management?()
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