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Database Startup fails with ORA-00444, ORA-07446

Database Startup fails with ORA-00444, ORA-07446

One day when I try to start my database my instance fails with following error:
SQL> startup;
ORA-00444: background process "MMAN" failed while starting
ORA-07446: sdnfy: bad value '' for parameter .

Cause:
Database startup event is logged into alert log file and alert log file is defined by the background_dump_dest parameter inside the initialization parameter. While starting up the instance, if fail to write into the alert log file then instance crushes and fail to startup.

Solution:
·        There may be different scenario whenever oracle fails to write alert log contents. Suppose the partition reside alert log file is full. In that case delete/move unnecessary file from the alert log partition directory.

·        There may be the case that the directory defined by the background_dump_dest does not exist in the OS. Create the directory that is missing and start the database again.

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