Did you try to create the database once already and it failed? If so, do a shutdown abort first, then try creating the database again.
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Trying to create a database, getting message database already mounted
Experts,
Trying to create a new database; however, getting messages:
ORA-01501: CREATE DATABASE failed
ORA-01100: database already mounted
what is the issue and how do I resolve it.
This is Oracle 11g
Thanks, MaryOS88
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Answers
Apart from above comment, You can check how many database you have in window environment by opening control Pannel/Administrative Tools/Services then look for OracleService<database_name
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by: markgeerPosted on 2008-11-03 at 10:42:15ID: 22869664
One possibility is that you are trying to run a script from SQL*Plus in a session that has already done an instance startup that included mounting (or opening) an existing Oracle database, but the script you are running includes an "alter database mount" or "alter database" open command.
Another possibililty is not having the value for the environment variable: ORACLE_SID set correctly.
Which O/S do you have? Does the server already have one (or more) Oracle database instances running on it, or are you trying to create the first one?