big_table of sqlplus

Create an empty table based on all_objects, this dictionary view is used to populate big_table

create table big_table as
select rownum id, a.*
from all_objects a
where 1=0
/

Set this table to NOLOGGING to improve performance. It is safe to use NOLOGGING mode for test tables.

Since the production system will not use such a test table, features such as oracle data guard will not be enabled

alter table big_table nologging;

Fills the table with the contents of all_objects, then inserts into itself iteratively, nearly doubling the size of the table with each iteration.

declare
l_cnt number;
l_rows number := &1;
begin
insert /*+ APPEND */ into big_table
select rownum id, a.*
from all_objects a;
l_cnt := sql%rowcount;
commit;
while (l_cnt < l_rows)
loop
insert /*+ APPEND */ into big_table
select rownum+l_cnt  id,
 OWNER,
 OBJECT_NAME,
 SUBOBJECT_NAME,
 OBJECT_ID,
 DATA_OBJECT_ID,
 OBJECT_TYPE,
 CREATED,
 LAST_DDL_TIME,
 TIMESTAMP,
 STATUS,
 TEMPORARY,
 GENERATED,
 SECONDARY,
 NAMESPACE,
 EDITION_NAME
from big_table
where rownum <= l_rows-l_cnt;
l_cnt := l_cnt + sql%rowcount;
commit;
end loop;
end;
/

Create a primary key constraint on this table.

alter table big_table add constraint
big_table_pk primary key(id)
/

collect statistics

begin
dbms_stats.gather_table_stats
( ownname => 'scott',
tabname => 'BIG_TABLE',
method_opt => 'for all indexed columns',
cascade => TRUE );
end;
/

Display the number of rows in the table

select count(*) from big_table;

result:

scott@ORCL>@D:\app\Administrator\product\11.2.0\big_table.sql;

Table has been created.


Table has been changed.

Enter a value of 1: 100000
Original value 3: l_rows number := &1;
new value 3: l_rows number := 100000;

PL/SQL procedure completed successfully.


Table has been changed.


PL/SQL procedure completed successfully.


  COUNT(*)
----------
    100000