Oracle shared memory realm not found

First off, please pardon my ignorance of the intricacies of Oracle administration.  At one point we had a real DBA, but no longer.  We have 2 Linux servers running Oracle 9.2.0.  on our primary server, we have 2 databases available, one for production, and one for a demo site.  On the other server we keep our development database.  I am able to connect to production and demo through SQL Plus Worksheet, but not our development database.  The connection fails with the following error:

ORA-01034: ORACLE not available
ORA-27101: shared memory realm does not exist
Linux Error: 2: No such file or directory

JDBC connections do not work either.

Strange thing is, this server was up and running just yesterday, and I have made no changes.  As I stated above, I know very little about Oracle administration, and have no idea where to start looking for a solution to this problem.  Any suggestions would be appreciated.
nequalsoneAsked:
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Computer101Commented:
PAQed - no points refunded (of 125)

Computer101
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baonguyen1Commented:
Look like your db has not been started yet. try this:

1. Log on Linux servetr
2. set ORACLE_SID <SID>
I assume you run csh
3.SQL> sqlplus /nolog
4.SQL>Connect / as sysdba
5.SQL>startup pfile=<>

Let us know if you have other issues

HTH
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nequalsoneAuthor Commented:
If I run dbstart manually as user oracle, the following output is produced:

dbstart executing....
starting DEV...
using sqlplus /nolog to start instance
Oracle database version = undef

SQL*Plus: Release 9.2.0.1.0 - Production on Tue Mar 23 10:49:29 2004

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.

SQL> Connected to an idle instance.
SQL> ORACLE instance started.

Total System Global Area   55644260 bytes
Fixed Size                   450660 bytes
Variable Size              37748736 bytes
Database Buffers           16777216 bytes
Redo Buffers                 667648 bytes
Database mounted.
ORA-01092: ORACLE instance terminated. Disconnection forced


SQL> Disconnected from Oracle9i Enterprise Edition Release 9.2.0.1.0 - Production
JServer Release 9.2.0.1.0 - Production

Database "DEV" warm started.
Starting Net8....
./dbstart: /local/bin/net8start: No such file or directory

I assume that this same process is occurring when the machine starts, as this DB is set to start in my oratab.

It looks like the database is unable to start at all.  Running "ps" on the linux server shows no processes running as user oracle.  Where does Oracle dump its logs by default?  I have already checked /var/log (where it should put them, IMHO).
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baonguyen1Commented:
To check the alert log, trace files, check dump, bdump ...

Can you try to start the db manually as my fisrt post ?

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nequalsoneAuthor Commented:
I did try to start the DB manually, but it complained about a missing file - sp1<lang>.msb.  Maybe I should clarify.  When I was connecting earlier, I was running SQL Worksheet on my desktop machine, not on the server itself.
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TadejMaliCommented:
I found a similar error and a possible cure:

Problem Description: ====================
When you startup your Oracle RDBMS database, you receive the following error:
       ORA-01092: ORACLE instance terminated. Disconnection forced.  

Problem Explanation: ====================  
Oracle cannot write to the alert_<SID>.log file because the ownership and/or permissions on the BACKGROUND_DUMP_DEST directory are incorrect.

Solution Summary: =================
 Modify the ownership and permissions of directory BACKGROUND_DUMP_DEST.

Note: I think that BACKGROUND_DUMP_DEST is the $ORACLE_HOME/admin/bdump. It contains alert_<SID>.log file. If the file exists and has proper permisions, try to restart the database and check what will be logged into it.
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