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Find Oracle fragmented tables

Oracle Database Tips by Donald BurlesonMay 20, 2016

Question: What do I do to reclaim disk space by reorganizing fragmented tables?  I need to get a list of my most fragmented tables.  How do I find the most fragmented tables?

Answer:  First, read these important notes on Oracle table fragmentation

This script will locate and name highly fragmented tables:

select
   table_name,round((blocks*8),2) "size (kb)" ,
   round((num_rows*avg_row_len/1024),2) "actual_data (kb)",
   (round((blocks*8),2) - round((num_rows*avg_row_len/1024),2)) "wasted_space (kb)"
from dba_tables
where
   (round((blocks*8),2) > round((num_rows*avg_row_len/1024),2))
order by 4 desc;

 


   
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