多项选择题

Which three resource plan parameters are used to enable Automatic Consumer Group Switching to estimate job execution times automatically， and to perform a switch to a low priority consumer group before they are initiated？（）

A.SWITCH_TIME
B.SWITCH_GROUP
C.MAX_SESS_POOL
D.SWITCH_ESTIMATE

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单项选择题

The database was started up using a text parameter file. What will be the default scope of changes made by using the SET clause of the ALTER SYSTEM statement？（）

A.Only MEMORY is updated.
B.Only SPFILE values are updated.
C.Only init.ora parameters are updated.
D.Both init.ora parameters and SPFILE values are updated.

多项选择题

Which two are regarding automatic space management segments？（）

A.A
B.B
C.C
D.D

多项选择题

Media recovery can sometimes be stopped by the inability to read past a certain point in the redo stream. This is often referred to as “stuck recovery”. Before Oracle9i， the
Database Administrator had few options to deal with stuck recovery. If the corrupt redo could not be recovered from some other source， then all transactions that committed after the corrupt point in the redo steam would be lost.
Oracle9i changes that with the Trial Recovery feature. Trial Recover is used to test the application of the redo logs to the database.
What are three other characteristics of Trial Recovery（）

A.Speeds up subsequent media recover actions.
B.Writes any uncorrupted block to disk during the test recovery.
C.Can be invoked by adding the TEST option to any RECOVER command.
D.Allows the Administrator to determine how many blocks are affected by corruption.
E.Marks blocks as corrupt in memory， allowing the test recover to proceed to completion.