Replication Agent supports replication of sequences in the primary database. To replicate a sequence invoked in a primary database, the sequence must be marked for replication and replication must be for all of that sequence. (This is analogous to marking and enabling replication for tables.)
Oracle does not log information every time a sequence is incremented. Sequence replication occurs when the Replication Agent captures the system table updates that occur when the sequence's cache is refreshed. Therefore, the sequence value replicated when a sequence is marked for replication is the “next” sequence value to be used when the current cache expires. The result is that not every individual increment of a sequence is replicated, but the standby site always has a value greater than the available cached values at the primary site.
To temporarily suspend replication of a marked sequence, disable replication for the sequence.