Errors and Queries regarding manually create database in oracle 9i

Question

Create database manually with following steps:
1) Create SID
C:\> set ORACLE_SID=mynewdb
2)Create suitable database directories within oracle directory.
Create folders udump,cdump,bdump within C:\oracle\admin\mynewdb\
3)Create PFILE
4)Create a password file using:
C:\> orapwd file=C:\oracle\ora90\database\PWDmynewdb.ora password=oracle
5)Create an instance of database
C:\> oradim -new -sid mynewdb
6)Start sqlplus:
C:\> sqlplus\nolog
7)connect / as sysdba
8)startup nomount
9)Run CREATE DATABASE script
'Database Created' prompt display on screen.
11) Run two scripts i.e. catalog.sql and catproc.sql
Following are errors and queries related to database creation. :
Errors+_
Following error occur when start database:
Total System Global Area 336359616 bytes
Fixed Size 282816 bytes
Variable Size 234881024 bytes
Database Buffers 100663296 bytes
Redo Buffers 532480 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced
For start database I give following command, but it gives me same error:
STARTUP OPEN PFILE='c:\ORACLE\ORA90\DATABASE\initmynewdb.ora'
or
STARTUP FORCE OPEN PFILE='c:\ORACLE\ORA90\DATABASE\initmynewdb.ora'
or
STARTUP OPEN
or
STARTUP FORCE OPEN
Queries_
*1)There are one databases in my machine name "orcl"*
when I give commands
C:\> connect / as sysdba
C:\> startup nomount
When I run "connect / as sysdba", in this which database instance connect?
how the oracle will know to start mynewdb database instance in nomount? although I am not create database.
*2) Step "startup nomount". In this, which database started in nomount?*
*3) There is no reference for PFILE in CREATE DATABASE script. How the oracle will know which is the PFILE for database mynewdb?*
*4) I create password file, how the oracle will know password file for which database (in this case mynewdb database)? How to map password file with particular database?*
Thanks and Regards,
Sachin

Answer 1

Hi,
not any thing new from the already given answer. But, i hope this examples gives more clarity.
Answers below:
1) ORACLE_SID is the answer
2) see the output below.
SQL> startup nomount
ORACLE instance started.
Total System Global Area 61785680 bytes
Fixed Size 730704 bytes
Variable Size 58720256 bytes
Database Buffers 2048000 bytes
Redo Buffers 286720 bytes
SQL> select instance_name from v$instance;
INSTANCE_NAME
mytestdB
SQL>
SQL> show parameter db_name
NAME TYPE
VALUE
db_name string
mytestdB
3) Check environment variables for ORACLE_HOME variable will let you know the location of the PFILE. By default it will be ORACLE_HOME/database (windows), ORACLE_HOME/dbs (LINUX/UNIX).
SET command will help you or use widows options.
In some other cases, the PFILE contains the link to it with IFILE value left in PFILE which should show the location.
4) Check environment variables for ORACLE_HOME variable will let you know the location of the password file. By default it will be expected in ORACLE_HOME/database (windows), ORACLE_HOME/dbs (LINUX/UNIX).
Regrds,
Vasu.