How do I fix Ora 01034?

Question

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.

Can't 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.

How do you resolve ORA-01034 Oracle not available ORA 27101 shared memory realm does not exist?

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. To resolve this issue with ORA-27101, you should be sure that ORACLE_HOME and ORACLE_SID are correct, and ORACLE_HOME should not have trailing slash.

How do I resolve connected to an idle instance?

Actually, Connected to an idle instance is a message rather than an error, it indicates that the database you entered is idle, stopped or shutdown. It's pretty normal if your database instance is not started up, you can just start the Oracle database instance up and check the open status.

How do I resolve ORA 01109 database not open?

If you are using 19c then just follow the following steps1Login with sys user.2alter the session to the pluggable database with the following command.3SQL>alter session set container=orclpdb;4Next startup the database.5SQL>startup After that database will not show the above error.

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