Call now: 252-767-6166  
Oracle Training Oracle Support Development Oracle Apps

 E-mail Us
 Oracle Articles

 Oracle Training
 Oracle Tips

 Oracle Forum
 Class Catalog

 Remote DBA
 Oracle Tuning
 Emergency 911
 RAC Support
 Apps Support
 Oracle Support

 SQL Tuning

 Oracle UNIX
 Oracle Linux
 Remote s
 Remote plans
 Application Server

 Oracle Forms
 Oracle Portal
 App Upgrades
 SQL Server
 Oracle Concepts
 Software Support

 Remote S


 Consulting Staff
 Consulting Prices
 Help Wanted!


 Oracle Posters
 Oracle Books

 Oracle Scripts

Don Burleson Blog 







Query Oracle Partition Size

Oracle Tips by Burleson Consulting

June 9, 2011

Question:  I need to know the data dictionary query to find the size of each partition in a partitioned table. 

I tried dba_tab_partitions but it does not provide the partition sizing. 

Will running this script give me the partition size?


Answer:  There are several ways to get a partition “size”:

  •  You can look at the size of the physical data files within the partition.
  • You can count-up all of the extents in the partition.
  • You can get the size of data within all segments of the partition.  

The dbms_stats does not give partition sizing information, it only recomputes optimizer statistics. This could be dangerous because it will change SQL execution plans.

However, dbms_stats will populate columns dba_tables, num_rows and avg_row_len which can be used to estimate the amount of row data within a partition.

 You can get partition sizing information from dba_segments:


    bytes / 1024/1024 "MB"
see code depot for full script
    segment_name in ('SEG1','SEG2','SEG3');  

    partition_name,segment_type,bytes/1024/1024 "MB"
see code depot for full script
    segment_type = 'TABLE PARTITION';  

There are MANY other ways of seeing a partition size. 

You can also use the dbms_space.space_usage procedure to get the number of blocks in a partition:

set serveroutput on
l_fs1_bytes number;
l_fs2_bytes number;
l_fs3_bytes number;
l_fs4_bytes number;
l_fs1_blocks number;
l_fs2_blocks number;
l_fs3_blocks number;
l_fs4_blocks number;
l_full_bytes number;
l_full_blocks number;
l_unformatted_bytes number;
l_unformatted_blocks number;
v_segname varchar2(500);

see code depot for full script

segment_owner => 'SCOTT,
segment_name => 'EMP,
segment_type => 'TABLE',
fs1_bytes => l_fs1_bytes,
fs1_blocks => l_fs1_blocks,
fs2_bytes => l_fs2_bytes,
fs2_blocks => l_fs2_blocks,
fs3_bytes => l_fs3_bytes,
fs3_blocks => l_fs3_blocks,
fs4_bytes => l_fs4_bytes,
fs4_blocks => l_fs4_blocks,
full_bytes => l_full_bytes,
full_blocks => l_full_blocks,
unformatted_blocks => l_unformatted_blocks,
unformatted_bytes => l_unformatted_bytes
dbms_output.put_line('total blocks = '||to_char(l_fs1_blocks + l_fs2_blocks + l_fs3_blocks + l_fs4_blocks + l_full_blocks)|| ' || total bytes = '|| to_char(l_fs1_bytes + l_fs2_bytes + l_fs3_bytes + l_fs4_bytes + l_full_bytes));

You can also use dbms_space.object_growth_trend and run a trend for a growing partition size.  

There are many other ways to compute the size of an Oracle partition.  If you don't want to write your own scripts, see the Oracle script collection.

Get the Complete
Oracle SQL Tuning Information 

The landmark book "Advanced Oracle SQL Tuning  The Definitive Reference"  is filled with valuable information on Oracle SQL Tuning. This book includes scripts and tools to hypercharge Oracle 11g performance and you can buy it for 30% off directly from the publisher.




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 -  2014

All rights reserved by Burleson

Oracle ? is the registered trademark of Oracle Corporation.



oracle dba poster

Oracle performance tuning software 
Oracle Linux poster