Historical information is stored in the server database. Historical information therefore consumes space, I/O bandwidth, and cache efficiency. Historical information can be removed as soon as more recent changes have been seen from all the other servers in the topology.
Historical information is purged in the following ways:
When a new change is performed on the entry.
By a purge process that can be triggered at regular intervals. The purge process saves space, at the cost of more CPU for processing the purge. The purge process is therefore configurable. For more information, see Changing the Replication Purge Delay in Sun OpenDS Standard Edition 2.0 Administration Guide.