[多选] What is true about a background engine? （）(Choose two.)

A . It is a server-side PL/SQL procedure.
B . When executing a PL/SQL function activity, it will automatically ping (cache) the PL/SQL code.
C . It executes deferred activities in decreasing order of their Cost property value (activities with higher cost value are processed first).
D . It would fail if another background engine process is started to handle the same type of activities within the same item type.
E . During its single invocation, it processes activities that were stuck, deferred or timed out when the background engine was started.

什么是素描？ You can back up the RMAN recovery catalog with RMAN.（） True。 False。 Which statement regarding the contents of the V$PARAMETER view is true？（） displays only the list of default values。 displays only the list of all basic parameters。 displays the currently in effect parameter values。 displays only the list of all advanced parameters。 displays the list of all the parameter files of a database。 Click the Exhibit button Which two statements are true if a NullPointerException is thrown on line 3 of class C？（） The application will crash.。 The code on line 29 will be executed.。 The code on line 5 of class A will execute.。 The code on line 5 of class B will execute.。 The exception will be propagated back to line 27.。高闭保护退出时，其闭锁的其它保护（）。可继续运行。退出运行。投信号位置。 What is true about a background engine? （）(Choose two.)

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[多选] What is true about a background engine? （）(Choose two.)

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