Few basic questions about database administration

Hello,
I have a few basic questions about database administration.
1. I switched one of my oracle instances to archivelog mode. I just cannot locate the archive log files on my windows system. The %ora_home%/ora92/database/archive directory is desperately empty...
2.What is the tools01.dbf datafile used for?
3.What is the undotbso1.dbf datafile used for?
Thanks in advance,
Julien.

1. The archive log location needs to be specified in your init.ora file. By default, Oracle will place the archive files in either ORACLE_HOME/dbs or ORACLE_HOME/database.
2. The tools01.dbf file belongs to the tools tablespace which should be set as the default tablespace for system. It primary purpose is to hold Oracle Forms and Reports database objects, however, it should also be used for holding other non sys database objects such as the perfstat (statspack) or other third party database schemas e.g. quests sqllab.
3. undotbs01.dbf file belongs to the undo tablespace.

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