recycle bin
a statement is made in...
Oracle® Database Administrator's Guide11g Release 2 (11.2)
Part Number E25494-01
in a subsection called....
What Is the Recycle Bin?
it says ...
The recycle bin is actually a data dictionary table containing information about dropped objects. Dropped tables and any associated objects such as indexes, constraints, nested tables, and the likes are not removed and still occupy space. They continue to count against user space quotas, until specifically purged from the recycle bin or the unlikely situation where they must be purged by the database because of tablespace space constraints.
....
this implies that the database has some sort of threshold at which it will automatically purge objects from the recyclebin if additional space is needed in a tablespace. is this true? please point me at documentation that outlines this "auto-purge" in detail.