JDBC: send batch of SQL commands as anonymous PL/SQL block

Question

Hi All,
I did a little measurement to see if I can improve jdbc
applications by batching dissimilar SQL commands into one
anonymous PL/SQL block and execute it once. To my surprise, for
a batch of 5 SQL commands, it take 60% more time than execute
each of the 5 SQL commands separately.
The same JDBC code, using similar SQL text batching, running
against Sybase or MSSQL shows 60%-300% improvement.
Is there any other way to batch dynamic dissimilar SQL commands
in Oracle other than using anonymous PL/SQL block? Here is an
example of how the "text-batching" PL/SQL block looks like:
"begin insert into testtab1(col1, col2) values(1, 'row1');
insert into testtab2(col1, col2) values(100, 1);....; end;"
Thanks,
Nam Nguyen
null

Answer 1

If you do:
declare
l_sql varchar2(32767);
l_value varchar2(32767);
begin
select query_sql into l_sql from lov where lov_id = 100;
dbms_output.put_line(l_sql);
end;
You'll see something like that:
SELECT
l.DESCRIPTION || decode(l2.DESCRIPTION,null,'',l2.description, '-' || l2.description) || decode(a.DT,'Y',' - Distributed Training','N',null,null) as value1
FROM ACTIVITY a
,MOUNTAINEERING m
,LOV l
,LOV l2
WHERE a.JSATFA_ID = 82
AND a.SPECIFIC_ACTIVITY_LOV_ID = l.LOV_ID
AND m.ACTIVITY_ID(+) = a.ACTIVITY_ID
AND m.CLASSIFICATION_LOV_ID = l2.LOV_ID(+);
you need to duplicate the '
you can do many things like:
CTH@> select * from sqls;
C
select first_name || ' ' || last_name as value1 from employees where rownum=1
1 fila seleccionada.
CTH@>
CTH@> ;
1 declare
2 l_sql varchar2(32767);
3 l_value varchar2(32767);
4 type generic_cursor is ref cursor;
5
6 c generic_cursor;
7
8 begin
9 select replace(c, ''', ''''') into l_sql from sqls;
10
11 execute immediate l_sql into l_value;
12 dbms_output.put_line(l_value);
13* end;
CTH@> /
Ellen Abel
Procedimiento PL/SQL terminado correctamente.
CTH@>