You configured the Flash Recovery Area （FRA） for your database. The database instance is runningin ARCHIVELOG mode. The default location for the archived redo log files is the Flash Recovery Area. Which two files are removed automaticallyif the space is required in the FRA as per the retention policy（） flashback log files。 backups that have become obsolete。 copies of the data files and control files。 archived redo log files that have multiple copies in a different archive location and not backed u。
耶克斯－多德森定律描述了学习动机与学习效果之间的关系根据该定律，以下描述正确的是（） 任务难度中等时，最佳动机激活水平也中等。 动机水平越高，学习效果越好。 任务较难时，最佳动机激起水平较低。 任务较容易时，最佳动机激活水平较高。
You want to track and store all transactional changes to a table over its lifetime. To accomplish this task， you enabled Flashback Data Archive with the retention of 5 years. After some time， the business requirement changed and you were asked to change the retention from 5 years to 3 years. To accomplish this， you issued the following command： ALTER FLASHBACK ARCHIVE fla1 MODIFY RETENTION 3 YEAR； What is the implication of this command？（） The command produces an error because the retention time cannot be reduced.。 All historical data is retained but the subsequent flashback data archives are maintained for only three years.。 All historical data is purged and the new flashback data archives are maintained for three years.。 All historical data older than three years is purged from the flashback archive FLA1.。
Given that Triangle implements Runnable， and： Which two statements， inserted independently at both lines 35 and 41， tend to allow both threads totemporarily pause and allow the other thread to execute？（） Thread.wait（）；。 Thread.join（）；。 Thread.yield（）；。 Thread.sleep（1）；。 Thread.notify（）；。
花灌木类
The database has the data block size set to 8 KB. You need to import a tablespace with a 4 KB block size into the database. Which additional memory parameter（s） should be configured to perform a transportable tablespace import？（）
