Using DBMS_SPACE.SPACE_USAGE

Question

I have a partitioned table that contain one SECUREFILE column (Oracle 11.2.0.2 Linux 64bit).
I would like to check its space usage in order to check if the compression and deduplication will help us to reduce the CLOB column's size.
I've found the following note in metalink: How to Check Space Occupied by LOB Compression
https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=861344.1
However, this link is refered to a regular table, not partitioned.
I've seen in the documentation of DBMS_SPACE.SPACE_USAGE that there is a partition name attribute, but I'm not seem to use the procedure correctly.
I'm trying to run the following code:
DECLARE
l_segment_size_blocks NUMBER;
l_segment_size_bytes NUMBER;
l_used_blocks NUMBER;
l_used_bytes NUMBER;
l_expired_blocks NUMBER;
l_expired_bytes NUMBER;
l_unexpired_blocks NUMBER;
l_unexpired_bytes NUMBER;
v_segname varchar2(30);
BEGIN
DBMS_SPACE.SPACE_USAGE(
segment_owner => 'LOG',
partition_name =>'PART_03_2009',
segment_name => ' [https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=861344.1|https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&id=861344.1] SECURITY_LOG',
segment_type => 'TABLE PARTITION',
segment_size_blocks => l_segment_size_blocks,
segment_size_bytes => l_segment_size_bytes,
used_blocks => l_used_blocks,
used_bytes => l_used_bytes,
expired_blocks => l_expired_blocks,
expired_bytes => l_expired_bytes,
unexpired_blocks => l_unexpired_blocks,
unexpired_bytes => l_unexpired_bytes
DBMS_OUTPUT.ENABLE;
DBMS_OUTPUT.PUT_LINE(' Segment Blocks = '||l_segment_size_blocks||' Bytes = '||l_segment_size_bytes);
DBMS_OUTPUT.PUT_LINE(' Used Blocks = '||l_used_blocks||' Bytes = '||l_used_bytes);
DBMS_OUTPUT.PUT_LINE(' Expired Blocks = '||l_expired_blocks||' Bytes = '||l_expired_bytes);
DBMS_OUTPUT.PUT_LINE(' Unexpired Blocks = '||l_unexpired_blocks||' Bytes = '||l_unexpired_bytes);
DBMS_OUTPUT.PUT_LINE('=============================================');
END;
And I get this error : ORA-03213: Invalid Lob Segment name for DBMS_SPACE package
Some information
select partition_name, interval, num_rows
from dba_tab_partitions where table_owner = 'LOG'
order by partition_position;
1     PART_03_2009     NO     1235667
2     PART_04_2009     NO     4621135
3     PART_05_2009     NO     1322246
4     PART_06_2009     NO     6442123
SELECT segment_name, partition_name, segment_type
FROM DBA_SEGMENTS
WHERE OWNER = 'LOG'
and segment_type in ('TABLE PARTITION','LOB PARTITION')
order by 2;
SECURITY_LOG                    PART_03_2009     TABLE PARTITION
SECURITY_LOG                    PART_04_2009     TABLE PARTITION
SECURITY_LOG                    PART_05_2009     TABLE PARTITION
SECURITY_LOG                    PART_06_2009     TABLE PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P495     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P498     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P519     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P523     LOB PARTITION
What am I doing wrong ? What should I change?
Thanks in advance,
Roni.

Answer 1

Thank you for your link.
I understood from Kyte's example how to use it and now it works.
I used the table name and partition name of the table instead of the lob segment name and the lob segment partition name.
Can you please tell me if there is a query that correlates between the lob segment partition name and the table partition name?
I would like to know what is the lob segment partition name of the table partition 'PART_03_2009' (or what is the table partition name of lob segment partition SYS_LOB_P495) and so on.
In the DBA_SEGMENTS I didn't find any fields that can help me connect between the two.
Information from DBA_SEGMENTS
SELECT segment_name, partition_name, segment_type
FROM DBA_SEGMENTS
WHERE OWNER = 'LOG'
and segment_type in ('TABLE PARTITION','LOB PARTITION')
order by 2;
SECURITY_LOG     PART_03_2009     TABLE PARTITION
SECURITY_LOG     PART_04_2009     TABLE PARTITION
SECURITY_LOG     PART_05_2009     TABLE PARTITION
SECURITY_LOG     PART_06_2009     TABLE PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P495     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P498     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P519     LOB PARTITION
SYS_LOB0000048317C00014$$     SYS_LOB_P523     LOB PARTITION
This anonymous block worked:*
DECLARE
l_segment_size_blocks NUMBER;
l_segment_size_bytes NUMBER;
l_used_blocks NUMBER;
l_used_bytes NUMBER;
l_expired_blocks NUMBER;
l_expired_bytes NUMBER;
l_unexpired_blocks NUMBER;
l_unexpired_bytes NUMBER;
v_segname varchar2(30);
BEGIN
DBMS_SPACE.SPACE_USAGE(
segment_owner => 'LOG',
partition_name =>'*SYS_LOB_P495*',
segment_name => '*SYS_LOB0000048317C00014$$*',
segment_type => 'LOB PARTITION',
segment_size_blocks => l_segment_size_blocks,
segment_size_bytes => l_segment_size_bytes,
used_blocks => l_used_blocks,
used_bytes => l_used_bytes,
expired_blocks => l_expired_blocks,
expired_bytes => l_expired_bytes,
unexpired_blocks => l_unexpired_blocks,
unexpired_bytes => l_unexpired_bytes
DBMS_OUTPUT.ENABLE;
DBMS_OUTPUT.PUT_LINE(' Segment Blocks = '||l_segment_size_blocks||' Bytes = '||l_segment_size_bytes);
DBMS_OUTPUT.PUT_LINE(' Used Blocks = '||l_used_blocks||' Bytes = '||l_used_bytes);
DBMS_OUTPUT.PUT_LINE(' Expired Blocks = '||l_expired_blocks||' Bytes = '||l_expired_bytes);
DBMS_OUTPUT.PUT_LINE(' Unexpired Blocks = '||l_unexpired_blocks||' Bytes = '||l_unexpired_bytes);
DBMS_OUTPUT.PUT_LINE('=============================================');
END;
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