Answer / guest

Cause: An attempt was made to downgrade the log transport
mode of a standby database from SYNC to ASYNC or ARCH when
the configuration was in Maximum Protection or Maximum
Availability mode and the primary database was a RAC
database. This is not allowed, even if there are other
standby databases with log transport modes set to SYNC to
support the data protection mode.

Action: You can do one of the following if you need to
downgrade the log transport mode of the standby: (1) Shut
down all instances of the primary database and restart one
instance with initialization parameter CLUSTER_DATABASE set
to FALSE. Downgrade the log transport mode, shutdown the
instance, and restart all instances with CLUSTER_DATABASE
set to TRUE. (2) Downgrade the protection mode to Maximum
Performance mode first. Then downgrade the log transport
mode, then upgrade the protection mode again (which involves
a shutdown and restart of the primary database). Note that
the above only works when there exists at least one more
standby database in the configuration that has the log
transport mode set to SYNC.

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