The following is the ORA-00260 error message, you can learn the cause and solution of the Oralce error.
ORA-00260 cannot find online log sequence string for thread string
Cause: The log sequence number supplied in the ARCHIVE statement does not match any of the online logs for the thread. This can result from any of the following situations:
Solution: Check the ARCHIVE statement, then specify a valid log sequence number. Specify a valid log sequence number.
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