How to list partitions and their LOB segment sizes

SELECT  ts.table_owner "owner",
        ts.table_name "table name",
        s.SEGMENT_NAME "segment name",
        s.SEGMENT_TYPE "segment type",
        s.SEGMENT_SUBTYPE "lob type",
        s.PARTITION_NAME "lob part name",
        lp.column_name "lob name",
        lp.compression "lob compression",
        lp.partition_name "table part name",
        ts.num_rows "num rows",
        lp.tablespace_name "tablespace",
        ROUND(sum(s.bytes)/1024/1024/1024) "size GB"
FROM dba_segments s JOIN dba_lob_partitions lp
ON (s.partition_name = lp.lob_partition_name)  
   JOIN DBA_TAB_PARTITIONS ts
        ON (TS.PARTITION_NAME = lp.PARTITION_NAME) 
WHERE lp.table_name='MYTABLE'
AND   ts.table_name='MYTABLE'
-- To limit the output to a specific tablespace, uncomment line below
AND   s.tablespace_name='DATA1'
-- To limit output to specific table subpartitions only, uncomment the following row
--AND   lp.subpartition_name like 'SYS_SUBP186786%'
AND s.segment_name IN ( SELECT lpt.lob_name 
                        FROM dba_lob_partitions lpt 
                        WHERE lpt.table_name IN ( 'MYTABLE' ) )
GROUP BY ts.table_owner,ts.table_name,s.SEGMENT_NAME,s.SEGMENT_TYPE,s.SEGMENT_SUBTYPE,s.PARTITION_NAME,lp.COMPRESSION,/*lp.subpartition_name*/lp.partition_name, lp.column_name,ts.num_rows,lp.tablespace_name
/*
To limit output to lob subpartitions with a specific size, 
uncomment the restriction above and change the operator to suit your needs ( <, >, =) 
or use BETWEEN x AND y
*/
-- HAVING ROUND(sum(s.bytes)/1024/1024/1024) between 1 and 10
ORDER BY 12 DESC;

Output:

owner	table name	segment name	segment type	lob type	lob part name	lob name	lob compression	table part name	num rows	tablespace	size GB
JIM	MYTABLE	SYS_LOB0000079505C00019$$	LOB PARTITION	SECUREFILE	SYS_LOB_P3273	MYLOB1	NO	SYS_P3270	864051	DATA1	20
JIM	MYTABLE	SYS_LOB0000079505C00019$$	LOB PARTITION	SECUREFILE	SYS_LOB_P4684	MYLOB1	NO	SYS_P4681	593520	DATA1	17
JIM	MYTABLE	SYS_LOB0000079505C00019$$	LOB PARTITION	SECUREFILE	SYS_LOB_P5692	MYLOB1	NO	SYS_P5689	2021989	DATA1	16

For queries against a subpartitioned table, see this post.

How to list subpartitions and their LOB segment sizes

The query below will list the lob segment names, the lob subpartition names, the table subpartition names and sizing information for any subpartitioned tables using LOB columns:

SELECT  ts.table_owner "table owner",
        ts.table_name "table name",
        s.SEGMENT_NAME "segment name",
        s.SEGMENT_TYPE "segment type",
        s.SEGMENT_SUBTYPE "lob type",
        s.PARTITION_NAME "lob subpart name",
        lsp.column_name "lob name",
        lsp.compression "lob compression",
        lsp.subpartition_name "table subpartition name",
        ts.num_rows "num rows",
        lsp.tablespace_name "tablespace",
        ROUND(sum(s.bytes)/1024/1024/1024) "size GB"
FROM dba_segments s JOIN dba_lob_subpartitions lsp
ON (s.partition_name = lsp.lob_subpartition_name)  
   JOIN DBA_TAB_SUBPARTITIONS ts
        ON (TS.SUBPARTITION_NAME = lsp.SUBPARTITION_NAME) 
WHERE lsp.table_name='DOCUMENTS'
AND   ts.table_name='DOCUMENTS'
-- To limit the output to a specific tablespace, uncomment line below
-- AND   s.tablespace_name='DATA1'
-- To limit output to specific table subpartitions only, uncomment the following row
--AND   lsp.subpartition_name like 'SYS_SUBP186786%'
AND s.segment_name IN ( SELECT lpt.lob_name 
                        FROM dba_lob_partitions lpt 
                        WHERE lpt.table_name IN ( 'DOCUMENTS' ) )

GROUP BY ts.table_owner,ts.table_name,s.SEGMENT_NAME,s.SEGMENT_TYPE,s.SEGMENT_SUBTYPE,s.PARTITION_NAME,lsp.COMPRESSION,lsp.subpartition_name, lsp.column_name,ts.num_rows,lsp.tablespace_name
/*
To limit output to lob subpartitions with a specific size, 
uncomment the restriction above and change the operator to suit your needs ( <, >, =) 
or use BETWEEN x AND y
*/
-- HAVING ROUND(sum(s.bytes)/1024/1024/1024) between 1 and 10
ORDER BY lsp.subpartition_name DESC;

Example output:

TABLE_NAME	segment name	segment type	lob type	lob subpart name	lob compression	table subpartition name	num rows	tablespace	size GB
MYTABLE	MYTABLE_LOB7	LOB SUBPARTITION	SECUREFILE	KLM_DOCS_2018_01	MEDIUM	KLM_SP_2018_01	164497	DOCS2018	235
MYTABLE	MYTABLE_LOB7	LOB SUBPARTITION	SECUREFILE	VISA_DOCS_2018_01	MEDIUM	VISA_SP_2018_01	72405	DOCS2018	76
MYTABLE	MYTABLE_LOB7	LOB SUBPARTITION	SECUREFILE	KLM_DOCS_2017_10	MEDIUM	KLM_SP_2017_10	16256	DOCS2017	19
MYTABLE	MYTABLE_SMALL_LOB7	LOB SUBPARTITION	SECUREFILE	KLM_DOCS_SMALL_2018_01	MEDIUM	KLM_SP_2018_01	164497	DOCS2018	18
MYTABLE	MYTABLE_SMALL_LOB7	LOB SUBPARTITION	SECUREFILE	VISA_DOCS_SMALL_2018_01	MEDIUM	VISA_SP_2018_01	72405	DOCS2018	8

How to list subpartitions and their sizes

First, find the number of partitions and subpartitions in a specific tablespace:

SELECT S.TABLE_NAME, S.TABLESPACE_NAME,COUNT(DISTINCT S.PARTITION_NAME) "num partitions", COUNT(DISTINCT S.SUBPARTITION_NAME) "num subpartitions"
FROM DBA_TAB_SUBPARTITIONS S 
WHERE S.TABLE_OWNER='SCOTT'
GROUP BY S.TABLE_NAME, S.TABLESPACE_NAME;

TABLE_NAME	TABLESPACE_NAME	num partitions	num subpartitions
MYTABLE1	DATA1	75	450
MYTABLE2	DATA2	73	219
MYTABLE3	DATA1	74	222
MYTABLE4	DATA2	74	222
MYTABLE5	DATA1	81	243

For a specific table, all partitions and their subpartitions:

SELECT P.PARTITION_NAME, P.SUBPARTITION_NAME, S.SEGMENT_TYPE,S.TABLESPACE_NAME,P.COMPRESSION,P.COMPRESS_FOR, P.NUM_ROWS, P.LAST_ANALYZED,ROUND(S.BYTES/1024/1024/1024,1) "gb" 
FROM DBA_SEGMENTS S JOIN DBA_TAB_SUBPARTITIONS P
ON (S.SEGMENT_NAME = P.TABLE_NAME)
WHERE S.SEGMENT_NAME='MYTABLE'
AND   S.OWNER = 'SCOTT'
AND S.PARTITION_NAME = P.SUBPARTITION_NAME
ORDER BY P.PARTITION_NAME, P.SUBPARTITION_NAME, S.BYTES DESC;

PARTITION_NAME	SUBPARTITION_NAME	SEGMENT_TYPE	TABLESPACE_NAME	COMPRESSION	COMPRESS_FOR	NUM_ROWS	LAST_ANALYZED	gb
SYS_P177766	SYS_SUBP177763	TABLE SUBPARTITION	DATA2	DISABLED		26021384	25.06.2020 22:55:36	12
SYS_P177766	SYS_SUBP177764	TABLE SUBPARTITION	DATA2	DISABLED		21531914	26.06.2020 23:32:34	9,1
SYS_P177766	SYS_SUBP177765	TABLE SUBPARTITION	DATA2	DISABLED		0	02.03.2020 00:56:19	0
SYS_P177774	SYS_SUBP177771	TABLE SUBPARTITION	DATA2	DISABLED		285	16.07.2020 23:21:12	0
SYS_P177774	SYS_SUBP177772	TABLE SUBPARTITION	DATA1	DISABLED		259	16.07.2020 23:21:30	0

For specific subpartitions:

SELECT P.PARTITION_NAME "Subpartition name", S.PARTITION_NAME,S.SEGMENT_TYPE,S.TABLESPACE_NAME,P.COMPRESSION,P.COMPRESS_FOR, P.NUM_ROWS, P.LAST_ANALYZED,ROUND(S.BYTES/1024/1024/1024,1) "gb" 
FROM DBA_SEGMENTS S JOIN DBA_TAB_SUBPARTITIONS P
ON (S.SEGMENT_NAME = P.TABLE_NAME)
AND   S.OWNER = 'SCOTT'
AND S.PARTITION_NAME = P.SUBPARTITION_NAME
AND P.SUBPARTITION_NAME in ('SYS_SUBP177773','SYS_SUBP177763','SYS_SUBP177764','SYS_SUBP177765');

PARTITION_NAME	Subpartition name	SEGMENT_TYPE	TABLESPACE_NAME	COMPRESSION	COMPRESS_FOR	NUM_ROWS	LAST_ANALYZED	gb
SYS_P177766	SYS_SUBP177763	TABLE SUBPARTITION	DATA1	DISABLED		26021384	25.06.2020 22:55:36	12
SYS_P177766	SYS_SUBP177764	TABLE SUBPARTITION	DATA1	DISABLED		21531914	26.06.2020 23:32:34	9,1
SYS_P177766	SYS_SUBP177765	TABLE SUBPARTITION	DATA1	DISABLED		0	02.03.2020 00:56:19	0
SYS_P177774	SYS_SUBP177773	TABLE SUBPARTITION	DATA1	DISABLED		0	02.03.2020 00:56:20	0

For a specific partition:

SELECT S.PARTITION_NAME "Subpartition name", S.SEGMENT_TYPE,S.TABLESPACE_NAME,P.COMPRESSION,P.COMPRESS_FOR, P.NUM_ROWS, P.LAST_ANALYZED,ROUND(S.BYTES/1024/1024/1024,1) "gb" 
FROM DBA_SEGMENTS S JOIN DBA_TAB_SUBPARTITIONS P
ON (S.SEGMENT_NAME = P.TABLE_NAME)
WHERE S.SEGMENT_NAME='MYTABLE'
AND   S.OWNER = 'SCOTT'
AND S.PARTITION_NAME = P.SUBPARTITION_NAME
AND P.PARTITION_NAME ='SYS_P14675'
ORDER BY S.BYTES DESC;

Subpartition name	SEGMENT_TYPE	TABLESPACE_NAME	COMPRESSION	COMPRESS_FOR	NUM_ROWS	LAST_ANALYZED	gb
SYS_SUBP14672	TABLE SUBPARTITION	DATA1	DISABLED		127103150	29.06.2019	51,4
SYS_SUBP14673	TABLE SUBPARTITION	DATA1	DISABLED		89059917	29.06.2019	34,1
SYS_SUBP14674	TABLE SUBPARTITION	DATA1	DISABLED		0	29.06.2019	0

For a specific tablespace:

SELECT S.PARTITION_NAME "Subpartition name",S.SEGMENT_TYPE,S.TABLESPACE_NAME,P.COMPRESSION,P.COMPRESS_FOR, P.NUM_ROWS, P.LAST_ANALYZED,ROUND(S.BYTES/1024/1024/1024,1) "gb" 
FROM DBA_SEGMENTS S JOIN DBA_TAB_SUBPARTITIONS P
ON (S.SEGMENT_NAME = P.TABLE_NAME)
WHERE S.OWNER = 'SCOTT'
AND S.TABLESPACE_NAME='DATA1'
AND S.PARTITION_NAME = P.SUBPARTITION_NAME
ORDER BY S.BYTES DESC; 

Subpartition name	SEGMENT_TYPE	TABLESPACE_NAME	COMPRESSION	COMPRESS_FOR	NUM_ROWS	LAST_ANALYZED	gb
SYS_SUBP27395	TABLE SUBPARTITION	SCOTT	DISABLED		100835414	27.10.2018 19:06:53	44,6
SYS_SUBP29902	TABLE SUBPARTITION	SCOTT	DISABLED		88951135	27.10.2018 21:23:24	41,6
SYS_SUBP29332	TABLE SUBPARTITION	SCOTT	DISABLED		83142250	27.10.2018 23:40:00	38,3
SYS_SUBP29395	TABLE SUBPARTITION	SCOTT	DISABLED		78610455	27.10.2018 19:00:05	37,1
SYS_SUBP28115	TABLE SUBPARTITION	SCOTT	DISABLED		75810738	07.07.2018 15:54:52	35,7

How to list partitions and their sizes

Using an inline view with a correlated subquery:

set lines 200
col partition_name format a40
SELECT P.PARTITION_NAME, (  SELECT ROUND(SUM(BYTES)/1024/1024/1024)
                            FROM DBA_SEGMENTS S
                            WHERE S.PARTITION_NAME = P.PARTITION_NAME
                            AND SEGMENT_NAME='&&TABLE_NAME') "size GB"
FROM DBA_TAB_PARTITIONS P
WHERE P.TABLE_NAME = '&&TABLE_NAME'
ORDER BY P.PARTITION_POSITION ASC;

Example output:

sqlplus / as sysdba @get_size.sql
Enter value for table_name: ARCHIVED_DOCUMENTS


PARTITION_NAME                      size GB
------------------------------   ----------
DOKARCHIVE1                           2.875
DOKARCHIVE2                               3
DOKARCHIVE3                               3
DOKARCHIVE4                               3
DOKARCHIVE5                               3
DOKARCHIVE6                          2.8125
DOKARCHIVE7                            2.75

Or, limit the output to specific partitions:

select s.partition_name,s.tablespace_name, p.compression,p.num_rows,Round(sum(s.bytes)/1024/1024/1024,1) "GB"
from dba_segments S join dba_tab_partitions p
on (s.partition_name = p.partition_name)
where s.segment_name='SALES_ARCHIVE'
and   s.owner='SH'
and s.partition_name in ( 'P_2015_01','P_2016_01','P_2017_01')
group by s.partition_name,s.tablespace_name,p.compression,p.num_rows
order by 1;

Example output:

PARTITION_NAME	TABLESPACE_NAME	COMPRESSION	NUM_ROWS	GB
P_2015_01	SALES_2015	ENABLED	22077874	2,3
P_2016_01	SALES_2016	ENABLED	394694450	42,3
P_2017_01	SALES_2017	ENABLED	481708328	48,9

If your partitions involve lob columns, make sure you fetch the sizes of the lob partitions, too.