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Query Oracle Partition Size

Oracle Database Tips by Donald BurlesonJune 9, 2015

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.

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