Find top tables by size tips

Oracle Database Tips by Donald BurlesonMarch 1, 2015

Question: How do I find the top tables by size in Oracle? I want to find the ten top largest tables.

Answer: The following script will find the top tables by size:

select
   *
from (
   select
      owner,
      segment_name,
      bytes/1024/1024 meg
   from
      dba_segments
   where
      segment_type = 'TABLE'
   order by
      bytes/1024/1024 desc)
where
   rownum <= 10;

Also see my notes on the

Oracle Training from Don Burleson

The best on site "Oracle training classes" are just a phone call away! You can get personalized Oracle training by Donald Burleson, right at your shop!

Burleson is the American Team

Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals. Feel free to ask questions on our Oracle forum.
Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.
Errata? Oracle technology is changing and we strive to update our BC Oracle support information. If you find an error or have a suggestion for improving our content, we would appreciate your feedback. Just e-mail:
and include the URL for the page.

Burleson Consulting

The Oracle of Database Support
Oracle Performance Tuning
Remote DBA Services

Copyright © 1996 - 2020

All rights reserved by Burleson

Oracle ® is the registered trademark of Oracle Corporation.

��