How to solve Oracle Database Error 1531 (ora-01531)

Oracle Error Code
   ora-01531

Description
   a database already open by the instance

Cause
   During ALTER DATABASE, an attempt was made to open a database on an instance for which there is already an open database.
How to Solve
   If you wish to open a new database on the instance, first shutdown the instance and then startup the instance and retry the operation.

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Similar Errors
  ORA-01431    ORA-01432    ORA-01433    ORA-01531    ORA-01532    ORA-01533    ORA-01534  Others

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