difference in dba_tables and dba_segments??

Running Enterprise 9.2.0.5 with the compatible parameter set to 8.1.0 on an IBM Unix/AIX5L system.
Why would the following selects return a different value for blocks? This table is analyzed using dbms_stats.gather_schema_stats.

select owner, segment_name, round(blocks*8/1024,2) as Megs from dba_segments
where owner = 'PRODDTA'
and segment_name = 'F0911'

returns 35840.02 for Megs

select owner, table_name, round(blocks*8/1024,2) as Megs from dba_tables
where owner = 'PRODDTA'
and table_name = 'F0911'

returns 35750.84 for Megs

I'd rather use dba_table instead of joining between the two to get num_rows, last_analyzed, and size values, but if these are returning different values how do I know which one is correct? Thank you,
Ben Received on Tue Jun 20 2006 - 09:58:45 CDT