Return the database key marking the end of the compaction operation in a Btree or Recno database. This is generally the first key of the page where the operation stopped.

If non-null, the starting point for compaction. Compaction will start at the smallest key greater than or equal to start. If null, compaction will start at the beginning of the database.

If non-null, the stopping point for compaction. Compaction will stop at the page with the smallest key greater than stop. If null, compaction will stop at the end of the database.

If true, return pages to the filesystem when possible. If false, pages emptied as a result of compaction will be placed on the free list for re-use, but never returned to the filesystem.