Oracle-L: Re: Simple favor from the guru's

From: <Peter.McLarty_at_mincom.com>
Date: Thu, 15 Aug 2002 16:48:27 -0800
Message-ID: <F001.004B72C5.20020815164827@fatcity.com>

Well this is from the 8.1.7 Doco Concepts guide Section introduction to an instance, and I quote "This combination of the SGA and the Oracle processes is called an Oracle instance." It doesn't include the initora file, the concepts guide a bit further into it is this one "To start an instance, Oracle must read a parameter file--a text file containing a list of configuration parameters (initialization parameters) for that instance and database". So if I read that correctly what we generally all refer to a "database" ie instance all files etc consists of three components: instance, database, and parameter file.

"After starting an instance, Oracle associates the instance with the specified database" I refers to mounting the database so all things that are connected to an instance when you mount is the database. that would include all dbf file, redo, archive.
That would make the alert log though part of the instance

So now where did I go wrong

Cheers

Peter McLarty               E-mail: Peter.Mclarty_at_mincom.com
Technical Consultant        WWW: http://www.mincom.com
APAC Technical Services     Phone: +61 (0)7 3303 3461
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"Karniotis, Stephen" <Stephen_Karniotis_at_compuware.com> Sent by: root_at_fatcity.com
16-08-2002 05:18 AM
Please respond to ORACLE-L

        To:     Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
        cc: 
        Fax to: 
        Subject:        Simple favor from the guru's

Everyone:

I am looking to all of my esteemed peers and gurus to clarify something that I know is blatantly wrong. Here is the scenario. I have a co-worker that is preparing for the DBA OCP debacle. They have completed a significant portion of the training and are preparing to take the first set
of exams.

To see what they have learned, I asked them to define what comprises an Oracle Instance and what comprises an Oracle database. Here are the responses I got:

An Oracle Instance

                 The database instance contains storage areas that allow

users to use
the database, data dictionary, redo log buffers and various processes that help to maintain, tune and run the database

An Oracle Database

                 The Database files consist of the parameter file or

init.ora file,
the physical data files, the control file and the redo log files and archived log files if the database is run in archive log mode

Now, we all know that an Oracle instance comprises the background processes, the memory processes, memory storage areas, the and INIT.ORA parameters whereas the database comprises the physical files, data dictionary, users, objects, etc.

The problem I have is the education is being supplied by our favorite vendor, Oracle. Did I go on vacation too long or is Oracle professing incorrect information in the OCP. Can one of the people that has taken the
exam the classes look this up in the manuals for me?

This proves my theory of refusing to take this exam unless hogwhipped and
tied down (Rachel, sit down please and thanks for volunteering). If bad information is being given, then what's the use of the exam?

                 Thank You

                 Stephen P. Karniotis
                 Product Architect
                 Compuware Corporation
                 Direct:                 (248) 865-4350
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                 Email:          Stephen.Karniotis_at_Compuware.com
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Author: Karniotis, Stephen
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