Also, note that there is a printed statistic of "blocks deleted". This contains two things.
The first is DXX blocks which DEFRAG found already deleted but which the index queue has not yet processed.
The second are blocks which the DEFRAG itself deletes. These are typically blocks which are combined with other blocks, but they may also be something like a cleanup of logically deleted entries which were still physically present in the DXX when DEFRAG ran.
Hence DEFRAG can be used as a form of DXX TSN cleanup.
So, the Deleted Blocks by DEFRAG cannot be necessarily seen reported in the next CXX report as we may expect. Your Database may be or was very fragmented or disorganized.
"The DEFRAG and its report deal with the DXX only.
The CXX report is IXX and DXX."
See CA Datacom/DB DBUTLTY REFERENCE GUIDE - DEFRAG FUNCTION for more info.