OFF_RECVRY_THREADS is the number of recovery threads used in logical recovery when the database server is offline (during a cold restore). This number of threads is also used to roll forward logical-log records in fast recovery.
Before you perform a cold restore, you can set the value of this parameter to approximately the number of tables that have a large number of transactions against them in the logical log. For single-processor computers or nodes, more than 30 to 40 threads is probably too many because the overhead of thread management probably offsets the increase in parallel processing.
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