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This issue can happen when we try to take backup of oracle database using Phoenix Oracle DTC agent and the backup fails with the message “ERROR at line 1:\nORA-01034: ORACLE, not available\nProcess ID: 0\nSession ID: 0 “

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

The SGA ( System Global Area ) requires more space than was allocated for it.

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

1. The SGA ( System Global Area ) requires more space than was allocated for it.
2. The operating-system variable pointing to the instance is improperly defined.

<code>level=error ts=2022-02-19T19:19:55.350126755-05:00 stack="failed to parse results: \nORACLE_BASE=/ora/app/oracle\nORACLE_HOME=/ora/app/oracle/product/12.1.0.2/dbhome\n\nSQL*Plus: Release 12.1.0.2.0 Production on</code>

<code>Sat Feb 19 19:19:54 2022\n\nCopyright (c) 1982, 2014, Oracle. All rights reserved.\n\nConnected to an idle instance.\n\nPHOENIX_ORACLE_AGENT_DTC_SQLPLUS_SCAN_START\nDECLARE\n*\nERROR at line 1:\nORA-01034: ORACLE not available\nProcess ID: 0\nSession ID: 0 Serial number: 0\n\n\nPHOENIX_ORACLE_AGENT_DTC_SQLPLUS_SCAN_END\nDisconnected\n\\ngoroutine 38 [running]:\</code>

If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.

The ORA-01034 error can sometimes be fixed by setting the ORACLE_SID environment variable:

Unix/Linux : <code>$ORACLE_SID=xxx</code>

<code>$sqlplus sys/manager@xxx as sysdba/sysbackup</code>

<code>C:\&gt; sqlplus sys/manager@xxx as sysdba/sysbackup</code>

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: <code>/etc/oratab</code>

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.

- If Oracle has been initialized, then on some operating systems, verify that Oracle was linked correctly. See the platform specific Oracle documentation.
- The ORA-01034 error can sometimes be fixed by setting the ORACLE_SID environment variable:
- Unix/Linux : <code>$ORACLE_SID=xxx</code>
 
 <code>$export ORACLE_SID</code>
 
 <code>$sqlplus sys/manager@xxx as sysdba/sysbackup</code>
 
 <code>SQL&gt; startup</code>
 
 <code>Window :</code>
 
 <code>C:\&gt; set ORACLE_SID=xxx</code>
 
 <code>C:\&gt; sqlplus sys/manager@xxx as sysdba/sysbackup</code>
 
 <code>C:\&gt; startup</code>
- 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: <code>/etc/oratab</code>
 
 <code>/var/opt/oracle/oratab</code>
- 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.

Note: Please involve DBA to verify the above steps.

<a href="https://www.techiepage.net/how-to-fix-ora-01034-oracle-not-available-error/#:~:text=The%20ORA-01034%20is%20a%20result%20of%20a%20discrepancy,is%20set%20to%20%E2%80%98old%E2%80%99%20home%2C%20not%20%E2%80%98new%E2%80%99%20home." rel="nofollow noopener noreferrer" target="_blank">How to Fix | ORA-01034: ORACLE Not Available error | Techie Page</a>

Backup fails with an error message “ERROR at line 1:\nORA-01034: ORACLE not available\nProcess ID: 0\nSession ID: 0”

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Backup fails with an error message “ERROR at line 1:\nORA-01034: ORACLE not available\nProcess ID: 0\nSession ID: 0”

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