The number of free container pages in the SAP liveCache basis layer is the number of pages where free space exists for the persistent saving of objects.
The number of free container pages is NOT the number of completely free pages.
As long as the number of free container pages is larger than zero, no new pages are requested when creating new data within a container.
Pages are only deleted if they are completely empty. This behavior explains the following situation: even though many objects were deleted in an SAP liveCache database, this space does not seem to be released.