How to find database files location (from system flat files)

Hi all,
Is there anyone who could help me to understand the Oracle database starting mechanism. I'm looking the doc for a few days, but it lacks some details...
I'm currently using Oracle 10g on RedHat, and my database has been created using DBCA. While the installation process, DBCA allows to use a customized location for "*all the database files*". I've chosen */data*.
Now, when I'm looking in my /etc/oratab file, I can see: mydb:$ORACLE_HOME:N
I guess the startup process of Oracle reads /etc/oratab (or I didn't understand its utility...) and then goes to $ORACLE_HOME to find the database infos. In this directory, I can see a directory named hostname_mydb/ and dbs/
The dbs/ directory contains my pfile (initmydb.ora) which contains some parameters such as control files, but nothing about the parent directory of my database files, ie:
control_files= /data/oradata/mydb/control01.ctl,....*
but no DB_CREATE_FILE_DEST as I could expect if the db was created through OMF.
The hostname_mydb/ contains nothing but a sysman directory.
I wonder how Oracle process knows where are the .dbf files or the "parent directory of database files" ? Does anyone have a clue?
I know it is possible to ask through sqlplus for .dbf location but I don't think it's the way used for the startup process (or at least, I hope there is another way)
Thanks! (and sorry if the question seems obvious or stupid...)

907899 wrote:
Thank you very much CPKT for all these details. It helps me to see clearer!
You are right, I have configure an Oracle Enterprise Manager and I didn't notice this directory was related to it...
And as I first thought, many data are in the binary control file. I just thought Oracle was a more simple system :)
You mention an Architecture Guide for DBA, is it the Database Concepts manual mentioned in the first reply or is it another manual (I can't find it, but obviously I have to improve my searching technique...)
Thanks!=================================================
Learning how to look things up in the documentation is time well spent investing in your career. To that end, you should drop everything else you are doing and do the following:
Go to tahiti.oracle.com.
Drill down to your product and version.
BOOKMARK THAT LOCATION
Spend a few minutes just getting familiar with what is available here. Take special note of the "books" and "search" tabs. Under the "books" tab you will find the complete documentation library.
Spend a few minutes just getting familiar with what kind of documentation is available there by simply browsing the titles under the "Books" tab.
Open the Reference Manual and spend a few minutes looking through the table of contents to get familiar with what kind of information is available there.
Do the same with the SQL Reference Manual.
Do the same with the Utilities manual.
You don't have to read the above in depth. They are reference manuals. Just get familiar with what is there to be referenced. Ninety percent of the questions asked on this forum can be answered in less than 5 minutes by simply searching one of the above manuals.
Then set yourself a plan to dig deeper.
- Read a chapter a day from the Concepts Manual.
- Take a look in your alert log. One of the first things listed at startup is the initialization parms with non-default values. Read up on each one of them (listed in your alert log) in the Reference Manual.
- Take a look at your listener.ora, tnsnames.ora, and sqlnet.ora files. Go to the Network Administrators manual and read up on everything you see in those files.
- When you have finished reading the Concepts Manual, do it again.
Give a man a fish and he eats for a day. Teach a man to fish and he eats for a lifetime.
=================================

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How to find database files location (from system flat files)

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