What could happen if you don’t monitor what’s happening?
Oracle 188.8.131.52+ new feature: if writes to a datafile fail, crash the database by default.
Go back to old ways: by setting underscore parameter _datafile_write_errors_crash_instance= false
This fix introduces a notable change in behaviour in that from 184.108.40.206 onwards an I/O write error to a datafile will now crash the instance. Before this fix I/O errors to datafiles not in the system tablespace offline the respective datafiles when the database is in archivelog mode. This behavior is not always desirable. Some customers would prefer that the instance crash due to a datafile write error. This fix introduces a new hidden parameter to control if the instance should crash on a write error or not: _datafile_write_errors_crash_instance With this fix: If _datafile_write_errors_crash_instance = TRUE (default) then any write to a datafile which fails due to an IO error causes an instance crash. If _datafile_write_errors_crash_instance = FALSE then the behaviour reverts to the previous behaviour (before this fix) such that a write error to a datafile offlines the file (provided the DB is in archivelog mode and the file is not in SYSTEM tablespace in which case the instance is aborted)