[oracle] How do I resolve this "ORA-01109: database not open" error?

I got a same problem. Below is how I solved the problem. I am working on an oracle database 12c pluggable database(pdb) on a windows 10.

-- using sqlplus to login as sysdba from a terminal; Below is an example:

sqlplus sys/@orclpdb as sysdba

-- First check your database status;

SQL> select name, open_mode from v$pdbs;

-- It shows the database is mounted in my case. If yours is not mounted, you should mount the database first.

-- Next open the database for read/write

SQL> ALTER PLUGGABLE DATABASE OPEN; (or ALTER PLUGGABLE DATABASE YOURDATABASENAME OPEN;)

-- Check the status again.

SQL> select name, open_mode from v$pdbs;

-- Now your dababase should be open for read/write and you should be able to create schemas, etc.

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