Oracle 9i under Fedora Core 3 - Installation HOWTO
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# 9. Miscellaneous Errors

ERROR:

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

This error happens when you reboot and try to login. You will get lots of errors when the database instance is not mounted/started automatically.

Solution:

1. Check `/etc/oratab` and make sure that `*:/opt/oracle/OraHome1` and `ordb:/opt/oracle/OraHome1` are set to "Y" (YES).

2. Try to initialize the database: $ORACLE_HOME/bin/dbstart.

ERROR:

    No start entry for SID * at /opt/oracle/OraHome1 in /etc/oratab

This might be caused by a bug in the dbstart script which searches for the sid file in the wrong place.

Solution:

1. cp `$ORACLE_BASE/admin/$ORACLE_SID/pfile/init_*.ora` \

   `$ORACLE_HOME/dbs/init$ORACLE_SID.ora`

2. As user oracle:

       $ sqlplus
       SQL> create pfile from spfile;
       SQL> exit

3. Run the `dbstart` script: $ORACLE_HOME/bin/dbstart.

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