Oracle Error ORA-09984: SGA file $ORACLE_HOME/dbs/sgadef$ORACLE_SID.dbf does not exist

Oracle Error Message

ORA-09984: SGA file $ORACLE_HOME/dbs/sgadef$ORACLE_SID.dbf does not exist

Reason for the Error

file does not exist or is not accessible

Solution

Restart the instance to create the SGA definition file.