Re: small bug related to deferred_segment_creation parameter

I'm not surprised that you didn't get a response in less than 3 hours - especially since you were talking about 11.2.0.4 and 12.1.0.2.

However, it may be a little more interesting to point out that this example does the same thing in 19.11.0.0 - and still creates the segments even if you include the "segment creation deferred" option with each of the listed partitions in the split.

Regards
Jonathan Lewis

On Thu, 22 Jul 2021 at 12:53, ahmed.fikri_at_t-online.de < ahmed.fikri_at_t-online.de> wrote:

> Hi everyone,
>
>
> it seems that the deferred_segment_creation parameter does not work
> properly when splitting a table partition that contains a clob field.
>
> If the partition is empty and has no segment, splitting it creates two
> segments for the old and new partitions.
>
> I tested this using this block in 11.2.0.4 and 12.1.0.2 (also attached and
> run with a non dba user):
>
>
>
> DECLARE
> PROCEDURE ex(cmd VARCHAR2) IS BEGIN dbms_output.put_line(cmd); EXECUTE
> IMMEDIATE cmd; END;
> PROCEDURE ex_ignore_error(cmd VARCHAR2) IS BEGIN ex(cmd); EXCEPTION WHEN
> OTHERS THEN NULL; END;
> PROCEDURE split_part(tbl VARCHAR2,p_part_val VARCHAR2) IS BEGIN
> ex('alter table '||tbl||' split partition maxvalue at
> (to_date('''||p_part_val||''',''yyyymmdd''))
> into (partition part_'||p_part_val||' tablespace users, partition
> maxvalue tablespace users)') ;END;
> BEGIN
> ex('alter session set deferred_segment_creation = true');
> ex_ignore_error('drop table tbl_test purge');
> ex_ignore_error('drop table tbl_test2 purge');
> /* create range-partitioned table without clob field */
> ex('create table tbl_test(id number, part_key date) tablespace users
> partition by range(part_key) (partition maxvalue values less than
> (maxvalue))');
> /* create range-partitoned table having a clob field */
> ex('create table tbl_test2(id number, part_key date, clob_col clob)
> tablespace users partition by range(part_key) (partition maxvalue values
> less than (maxvalue))');
> /* the table is empty. Splitting the maxvalue partition for the table
> without clob */
> split_part('tbl_test','20200101');
> /* until here no segments is generated for tbl_test and tbl_test2 tables
> spltting the maxvalue partition for the table having clob field */
> split_part('tbl_test2','20200101');
> -- two segments are created for the table having clob field
>
> /* SELECT * FROM user_segments WHERE segment_name IN
> ('TBL_TEST','TBL_TEST2')
> TBL_TEST2 PART_20200101 TABLE PARTITION ASSM USERS
> TBL_TEST2 MAXVALUE TABLE PARTITION ASSM USERS
>
> */
>
>
> END;
>
>
>
> Is this already known? Any Idea?
> For me, this behavior is annoying and is considered a bug.
>
>
>
> Best regards
>
> Ahmed
>
>
> 
>

--
http://www.freelists.org/webpage/oracle-l