Change Logs in Directory Replication

Oracle Internet Directory records each change as an entry in the change log store. The directory replication server of the consumer retrieves changes residing in the change log store of the supplier and applies them to the consumer.

Each entry in the change log store--that is, each change log object--has a unique change number. The consumer keeps track of the change number of the last change it applied, and it retrieves from the supplier only those changes with numbers greater than that of the last change it applied.

• In an LDAP-based replication agreement, the directory replication server stores the last change number it applied in the orlclastappliedchangenumber attribute of the replication agreement entry.

• In a replication agreement based on Oracle9iAdvanced Replication, the directory replication server stores the last change number it applied in the changenumber attribute of the changestatus entry. This entry looks like this: changenumber=last_applied_change_number, supplier=supplier_node,consumer=consumer_node. For example, if the last change a consumer applied had a number of 250, then subsequent changes it retrieves from that supplier would need to have numbers greater than 250.