Identify two correct statements about the Active Session History (ASH) data. (Choose two.)
A.
A part of SGA memory is used to store ASH data as rolling buffer.
B.
The ASH data can be analyzed between any two small time intervals.
C.
All ASH data in memory are flushed to disk by MMON in every 3 seconds.
D.
All ASH data in memory are flushed to disk by MMNL process whenever the buffer is full.
AD
http://docs.oracle.com/cd/E11882_01/server.112/e40540/process.htm#CNCPT9841
“The manageability monitor lite process (MMNL) writes statistics from the Active Session History (ASH) buffer in the SGA to disk. MMNL writes to disk when the ASH buffer is full.”
A is right. ASH is in SGA
B is wrong.
C is wrong.
D is right. MMNL
So A.D. are correct
AD is correct.
As for B: not any small interval is possible. Minimum length for an interval is one second.