Try the following (if possible) : turn on statement timing, then issue a simple SELECT on DBA_FREE_SPACE and keep record of elapsed time; create a couple of hundreds of thousands tables in a 10g database, and then delete it (the DB recycle bin feature must be turned on) ... now you have a full-to-the-top recycle bin, then repeat the SELECT on DBA_FREE_SPACE, you'll see it will take a longer time to complete, and finally will get a huge number of rows. You may think that suddenly the free space has been multiplied... but your response time divided.
I don't know ... I'll let you think about this puzzling situation here and come back later to see how you doing.
Question: Can you figure out what is happening?
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