Change the ADRCI retention for less important traces.

                                    

ADRCI is the command line interface for diagnostic utility used for viewing diagnostics data like listener log , alert log ,incident and core dump etc and creating incident packages. 

Change the ADRCI retention for less important traces.

Enter ADRCI:

$ adrci

adrci> show homes

adrci> set home diag\rdbmsorcl\orcl

adrci> show control

Default retention policy for this HOME is set to 720 hours. 

adrci> set control (SHORTP_POLICY = 72)

Changed retention from 720 hours to 72 hour.

You could do an immediate purge of trace files:
adrci> purge -age 4320 -type trace

This will cleanup all traces older than 72 hours or 3 days.