Application can't connect to Oracle 12c Database

HappyCode 0001 : Application can't connect to Oracle 12c Database

 At that time, we received mail that app client can't connect to ORCLPDB which is Oracle DB 12c , 
with this error "ORA-01033: ORACLE initialization or shutdown in progress". 


Based on that error code, seems DB is down, so we just crosscheck using DBA access and Yes, DB ORCLPDB is down.

 So, these are the ways that we used to check and bringup the ORCLPDB database.



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