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How to fix ora-01034 Oracle not available?
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.
Could not connect to the database ora-01034 Oracle not available?
An ORA-01034 error is triggered due to the Oracle system not being available or started up. This could derive from the System Global Area (SGA) necessitating more storage space than what is currently being allocated for your Oracle database. The error could also result during an upgrade of your Oracle systems.
What does Ora 01034 and ora-27101 mean?
ORA-01034 and ORA-27101 normally indicate that the database instance you’re attempting to connect to is shut down and that you’re not connected as a user who has permission to start it up. Log on to the server 192.168.1.53 and start up the orcl instance, or ask your DBA to do this for you. Had the same issue on windows XP.
I faced the same issue while creating the connection on SQLDeveloper “ORA-01034: ORACLE not available ORA-27101: shared memory realm does not exist” 1.Update the listene.ora file to include the SID.
Where to find ora-27101 in Windows 10?
The solution in Windows may be to start the Windows services. MOSC offers valuable information regarding ORA-27101. ORA-27101 is often thrown along with ORA-01034 during database installation. ORA-27101 is also seen after installation is complete, when attempting to use SQL*Plus.
Navigate to /etc/oratab and edit it as root. Change the N at the very end to Y. This will make the database start up whenever you restart your machine, so you won’t have this trouble again. Set environment variable ORACLE_HOME and ORACLE_SID should fix.