I´ve encountered with the next doubt.
I´m making a prepare for installation of EHP5. I put the DB on mode no_archivelog. The files in the folder oraarch aren´t create, but I can see under the folder E:oracleECP102RDBMS there are a lot of files of type ARC01502_0741290188.001.
If the database are in mode no_Archivelog, what is generating?