How to shrink this LOB and what steps need to perform.

Problem Description: hi
one of our production database having one table i that table having 320 gb LOB in one column
can you please suggest how to shrink this LOB and what steps need to perform.
during shrinkg of LOB how much undo tablespace is require,and does it create more archive log because LOB size is 320gb.
this table having function based index also.so we will not shrink it.
we need to release the space from database this in only big LOB out of my DATABASE its took approx. 80%.
there is any way we can reclame this space with less time.
please suggest how to do this and how much downtime is required.
database version 10.2.0.4 and OS AIX 5.3

Hi;
Please check below which could be helpful for your issue:
Shrink LOB Segment On Partitioned Table [ID 802059.1]
How to determine the actual size of the LOB segments and how to free the deleted/unused space above/below the HWM [ID 386341.1]
Why is no space released after an ALTER TABLE ... SHRINK? [ID 820043.1]
Troubleshooting Guide (TSG) - Large Objects (LOBs) [ID 846562.1]
Regard
Helios

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