table truncated, but the segments have not been cleaned.

Hello

I am running oracle 11g 11.2.0.1.0 version on ASM.

I truncated a table partitioned 3.5 GB, but extensions are not getting deleted and space is not to be released.

the table have all lines now, but the dba_extents and dba_segments show still 3.5 GB in size.

Please suggest what could be the possible reason.

Please let me know if additional information is required to answer my qustion.

concerning

Here is a demo that shows when a table is created with a FIRST, a TRUNCATE only retractable initial size.  A BLOW with a STORAGE clause can.

SQL > create table hkc_test_99 (id_column number, data_column varchar2 (10)) storage (initial 64M);

Table created.

SQL > insert into hkc_test_99 select 1, 'A' from dual;

1 line of creation.

SQL > commit;

Validation complete.

SQL > select extent_id, bytes/1024 to user_Extents where nom_segment = 'HKC_TEST_99 ';

EXTENT_ID BYTES/1024
---------- ----------
0 65536

1 selected line.

SQL >

SQL > truncate table hkc_test_99;

Table truncated.

SQL > select extent_id, bytes/1024 to user_Extents where nom_segment = 'HKC_TEST_99 ';

EXTENT_ID BYTES/1024
---------- ----------
0 65536

1 selected line.

SQL >

SQL > alter table hkc_test_99 moving storage (initial 64K);

Modified table.

SQL > select extent_id, bytes/1024 to user_Extents where nom_segment = 'HKC_TEST_99 ';

EXTENT_ID BYTES/1024
---------- ----------
0 64

1 selected line.

SQL >

Hemant K Collette

Tags: Database

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