Specify the locations of the mirrors for the existing log
devspaces and choose 'Change LogMode' to chamge the LogMode
to DUAL.
The mirror devspaces need to be integrated into the database. To
integrate the devspaces automatically, mark the option 'Restart
database and integrate mirror devspaces implicitly after LogMode
change' to restart the database immediately after the log mode change.
Backup the log first to shorten the integration process.
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