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ORA-01034: ORACLE Not Available tips

Oracle Error Tips by Burleson Consulting


Question:  I am getting the errors ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist.

Answer: The ORA-01034 is  simple error, it means that your database is down!  Oracle oerr utility notes this about the ORA-01034 error:

ORA-01034: ORACLE not available

Cause: Oracle was not started up. Possible causes include the following:

- The SGA requires more space than was allocated for it.

- The operating-system variable pointing to the instance is improperly defined.

Action: Refer to accompanying messages for possible causes and correct the problem mentioned in the other messages. If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.

You may find that you are experiencing ORA-01034 when attempting to upgrade your Oracle database. 

ORA-01034 is thrown during the attempt to upgrade because there is an invalid entry in one of the following files:

  1. /etc/oratab
  2. /var/opt/oracle/oratab

The ORA-01034 is a result of a discrepancy between ORACLE_HOME and ORACLE_SID

To resolve ORA-01034, be sure that the ORACLE_HOME and ORACLE_SID properly match within the files /etc/oratab or /var/opt/oracle/oratab .

As a last step in solving your ORA-01034 problem and running DBUA, make sure that  ORACLE_HOME is set to 'old' home, not 'new' home.


This article covers ORA-01034 when trying to change the domain name.  It mentions that:

So long as you have the DNS host name in your tnsnames.ora file, changing the IP address from the DNS file (i.e. /etc/hosts) should not have any changes at the database level.


 





 

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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

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Errata?  Oracle technology is changing and we strive to update our BC Oracle support information.  If you find an error or have a suggestion for improving our content, we would appreciate your feedback.  Just  e-mail:  and include the URL for the page.


                    









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