I'm not an Oracle DBA, but now must install a instance. I use sqlplus to login but all commands return '2'
Why is this so?
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First look here Oracle® Database 2 Day DBA 11g Release 2 (11.2), in the Oracle documentation.
If the only thing you want is a running Oracle Instance, create an init.ora file, with minimum parameters and from sqlplus issue
If the instance is running you can create a database, where the data is stored in datafiles. In Oracle, an instance is just a collection of processes that serves as an interface to the database files.