Parallel insert with noappend hint

Hello

I have a question about parallel to insert with the noappend indicator. Oracle Documentation says that:

Append mode is the default for a parallel insert operation: data are always inserted in a new block, which is allocated to the table. Therefore, the APPEND is optional. You must use Add method to increase the speed of INSERT operations, but not when the use of space must be optimized. You can use NOAPPEND to void append mode.


When I delete (all) and insert (parallel use noappend) and I see the number of blocks used by my table always increases. The blocks must not be reused due to remove it before insert?


Version; Oracle Database 11g Enterprise Edition Release 11.2.0.4.0


Here is the script I used:


drop table all_objs;

create the table all_objs in select * from object where rownum < 10000;

Start

DBMS_STATS.gather_table_stats (User, 'ALL_OBJS');

end;

Select the blocks of all_tables where table_name = 'ALL_OBJS ';

ALTER session enable parallel dml.

Start

I'm in 1.5

loop

delete from all_objs;

Insert / * + NOAPPEND PARALLEL (8 O) * /.

in all_objs O

Select * from object where rownum < 10000;

end loop;

end;

commit;

Start

DBMS_STATS.gather_table_stats (User, 'ALL_OBJS');

end;

Select blocks of all_tables

where table_name = 'ALL_OBJS ';

Output:

Deleted table.

Table created.

PL/SQL procedure successfully completed.

BLOCKS

----------

142

1 selected line.

Modified session.

PL/SQL procedure successfully completed.

Validation complete.

PL/SQL procedure successfully completed.

BLOCKS

----------

634

1 selected line.



Why block increase of 142 to 634 even with the noappend trick?


Thank you.

Well, looks like the expected result:

Repeated insertions PARALLELS - a lot of direct path writes, table size increases as the lines are added above the HWM, final size after ten iterations = 10 x original size

NOAPPEND PARALLEL repeated inserts - no direct path did not write, size of the table increases do not significantly, lines inserted under the HWM

The NOAPPEND PARALLEL insert clearly is re-use of space released by the deletion. However, I wonder why there is an overload of 3,000 blocks? It would be interesting to see how the overhead varies according to the degree of parallelism.

Tags: Database

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