Found several “Clearing DBIID” in the log of a recently updated server. The IBM Lotus Software Knowledgebase explains this entries as follows:

The entry is a new logging message specific to cases where a server (and database) use the transaction logging feature. The feature was introduced in Domino releases 8.0.2 and 8.5. The feature will also be included in Domino 7.0.4.

Read the full technote here.