ORA-01034: Oracle not available
ORA-27101: Shared memory realm doesn't exist.
I am new to Oracle and could not correctly follow the solutions provided on the Internet regarding the above errors. Hence, please write to me in detail as to how and where I should make necessary changes to get going.
After you have installed the Oracle software on your system, you will need to run the Database Configuration Assistant (DBCA) to create your database. This will create a service with a name similar to OracleServiceXXXX (where XXXX is your database identifier). If you have already created the database, then ensure that this service is running.
If this service is down, then you will get the above error.