This type of replication is called Chained Replication because it is a two-step replication process. Sometimes a SECONDARY database can replicate data from another SECONDARY. Usually, SECONDARY databases copy data changes directly from PRIMARY. ![]() As a result, datafiles on SECONDARY are kept in sync with changes on PRIMARY. Oplog entries are applied in the same order they were inserted in the log. Then, the SECONDARY database applies changes from the Oplog to its own datafiles.If there are any changes, then Oplog entries are copied from PRIMARY to SECONDARY as soon as they are created on the PRIMARY node. ![]()
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