ORA-38705: Expected block size string does not match string in log header.
Cause: When the flashback log file header was read, the block size in the control file did not match the block size contained in the header.
Action: If you are doing a FLASHBACK DATABASE, then the flashback cannot be performed because of the corrupted log. A restore and an incomplete recovery must be performed instead.
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ORA-38705Expected block size string does not match string in log header.