Answer / guest

Cause: Attempt to open thread failed because it is necessary
to switch redo generation to another online log, but all the
other logs are being cleared or need to be archived before
they can be used.

Action: If the ALTER DATABASE CLEAR LOGFILE command is still
active then wait for it to complete. Otherwise reissue the
CLEAR command. If there are other online logs for the
thread, that are not being cleared, then archive the logs.

Please add more information about this Error

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