IBM FileNet P8, Version 5.2.1

Content duplication suppression

The suppression of duplicate content potentially reduces the storage space that is required to store content. Content Platform Engine suppresses duplicate content by checking the existing content before adding new content to the storage area. If identical content exists, the new content is not stored separately from the existing content. If no identical content exists, the new content is added in the normal manner. An example of when suppressing duplicate content might help reduce the required storage space is when archiving email messages to a Content Platform Engine object store.

Suppressing duplicate content might decrease storage space requirements but it also slightly increases processing time. To help you determine whether your space savings make the trade-off worthwhile, Content Platform Engine provides storage statistics for each server. The statistics include the following items:

The number of duplicate content elements uploaded and then discarded as already present
The number of requests to delete content elements that did not result in deletion of the actual content.

Restriction:

Content duplication suppression does not apply to fixed storage areas.
Content encryption potentially affects the suppression of some duplicate content.
For duplicate suppression purposes, enabling (or re-enabling) content encryption for a storage area with the Encrypt Content property divides the content into two parts: the preexisting content as one part and the content that you add after you enable encryption as the other part. Across such a division, Content Platform Engine does not recognize or suppress identical content for the following reasons:
- The stored form of content when encrypted differs from the stored form of the same content when unencrypted.
- The stored form of content when encrypted with one encryption key differs from the stored form of the same content when encrypted with another encryption key. (Content Platform Engine generates a new encryption key for a storage area when you reenable encryption.)
Within these content divisions, content encryption does not affect the suppression of duplicate content. For example, for any content that you add after enabling encryption, the content is suppressed in the same way as would have been the case without encryption.