Dbms_session.free_unused_user_memory :  when we can use this functionality?

Hi All,
I am new DBA,
I need to know when we can use dbms_session.free_unused_user_memory ?
Thanks,
Edited by: BIJGA on 12 mars 2012 03:26

This procedure reclaims unused memory after performing operations requiring large amounts of memory (more than 100K).
Examples of operations that use large amounts of memory include:
Large sorting where entire sort_area_size is used and sort_area_size is hundreds of KB.
Compiling large PL/SQL packages, procedures, or functions.
Storing hundreds of KB of data within PL/SQL indexed tables.
http://docs.oracle.com/cd/B19306_01/appdev.102/b14258/d_sessio.htm#i1010058

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