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ORA-16000: database or pluggable database open for read-only access
What is your question?
How to open it read write?
If it is not a snapshot PDB you just can:
alter pluggable database <YOUR_DBNAME> close immediate;
alter pluggable database <YOUR_DBNAME> open read write;
Otherwise, please tell us, what you need ;-)
when you create pluggable database first
you need to open read write first
alter pluggable database <YOUR_DBNAME> open read only;