ORA-00204: error in reading (block string, # blocks string)
of controlfile



ORA-00204: error in reading (block string, # blocks string) of controlfile..

Answer / guest

Cause: A disk I/O failure was detected on reading the
controlfile.

Action: Check if the disk is online, if it is not, bring it
online and try a warm start again. If it is online, then you
need to recover the disk.

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