Help: blocks column from dba_tables and dba_segments

Hi, Folks
We are trying to keep the small table in the keep buffer.

We have a table which has only 100 rows, but blocks from dba_tables and dba_segments show the table has 128 blocks.

So I truncated the table and re-insert the rows back to the table. Now the blocks in Dba_tables shows only 4 blocks where dba_segments still shows 128 blocks.

How can I bring down the blocks from dba_segments as well?

When you keep the table in the Keep buffer, does it keep all the 128 blocks from dba_segments or it only keep the 4 blocks from dba_tables?

Thanks for your help.  

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