title: BIN$ tables without "recycle bin"
body: <p>My Oracle Database (10.2) contains tables in Form "BIN$". They are listed by <pre>select * from user_recyclebin</pre> but not by <pre>show recycle_bin</pre></p>
  
  <p>The command "show parameters" indicate "recyclebin=on" (it is also the default value in Oracle).</p>
  
  <p>Moreover: Oracle put a table in the recycle bin only if it is member of a cluster, isn't it? (I understand the Oracle Administrator Guide so...). I indeed have dropped the corresponding tables, but I never have used any cluster in this database...</p>
  
  <p>A call to PURGE TABLE has worked: the entry disappeared of user_recyclebin. But why did I have it?</p>