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ORA-00471 by IO Failure

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ORA-00471: DBWR process terminated with error

When we found ORA-00471 in alert log, the running instance is shutdown.

Errors in file /oracle/admin/ORCL/bdump/ORCL_dbw5_43853451.trc:
ORA-07445: exception encountered: core dump [] [] [] [] [] []

Errors in file /oracle/admin/ORCL/bdump/ORCL_pmon_13500160.trc:
ORA-00471: DBWR process terminated with error

PMON: terminating instance due to error 471
Instance terminated by PMON, pid = 13500160

As we can see, PMON determined to terminate the instance because of error 471. Even though we know a db writer process (dbw5) was involved, the root cause is still unknown because we have no argument in ORA-07445. We suspected that the problem was resulted from IO channels. Do you have any idea about it? Please leave your comment below.

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