Stored procedure for exec. multiple insert queries

Question

Hello everybody,
I am running on
select banner from v$version;
Output:
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
I am a new to oracle and I need some help.
I have to populate a table on monthly basis, for which I am required to run 20 queries.
All queries retrieve data from the same table in another schema.
I need to schedule a SP in order to be able to run all these queries.
Till now, I have built separate SPs for the queries Proc_1, Proc_2, Proc_3, ..., Proc_20 and a final big SP (*main_sp*) which calls these SPs.
Being that I have to change the date value for every month (I am doing it manually every single month), for every single query,
I was wondering if there is a way to include all these queries in a single stored procedure.
I am reading here execute parallel queries
but I do not want to create 20 jobs.
I found this topic, which seems to be interesting too, but I have never done this before:
Executing multiple SQL scripts in a batch
Moreover, how can I manage to insert the value of date only once (e.g in the main_sp) and every queries gets this value automatically.
P.S.
All queries retrieve data from the same table in another schema and fill in with data the same table in actual schema.
insert into destin_tbl
select from source_tbl@dbb_link
Here is how my actual work looks like:
First, I have built 20 sp, for each and every query:
CREATE OR REPLACE PROCEDURE "SP_1" (
START_DATE out DATE,
IS
BEGIN
START_DATE := SYSDATE;
insert /*+ append nologging parallel(x,4)*/into destin_tbl x
select /*+ parallel(a,4)*/ field_1, field_2, field_3
from source_tbl@dbb_link a
where a.date_key >= 20101201 and a.date_key < 20100101 -- full month (december 2010) here
and other conditions
commit;
END SP_1;
= = = = = =
CREATE OR REPLACE PROCEDURE "SP_2" (
START_DATE out DATE,
IS
BEGIN
START_DATE := SYSDATE;
insert /*+ append nologging parallel(x,4)*/into destin_tbl x
select /*+ parallel(a,4)*/ field_1, field_2, field_3
from source_tbl@dbb_link a
where a.date_key >= 20101201 and a.date_key < 20100101 -- full month (december 2010) here
and other conditions
commit;
END SP_2;
CREATE OR REPLACE PROCEDURE "SP_20" (
START_DATE out DATE,
IS
BEGIN
START_DATE := SYSDATE;
insert /*+ append nologging parallel(x,4)*/into destin_tbl x
select /*+ parallel(a,4)*/ field_1, field_2, field_3
from source_tbl@dbb_link a
where a.date_key >= 20101201 and a.date_key < 20100101 -- full month (december 2010) here
and other conditions
commit;
END SP_20;
I change the values for the date_key field every month I need to insert data, before I run the main_sp:
CREATE OR REPLACE PROCEDURE "main_sp" (
START_DATE out DATE
IS
BEGIN
sp_1(START_DATE);
sp_2(START_DATE);
sp_3(START_DATE);
sp_20(START_DATE);
END main_sp;
/

Answer 1

You would need to pass a parameter to the main procedure and to all of the sub procedures. I would do it somethign like this. The main procedure takes a single date parameter the way I have structured it here, any date in the month you are interested in will do
PROCEDURE main_sp(p_date IN DATE)
   l_st_dt  VARCHAR2(8);
   l_end_dt VARCHAR2(8);
BEGIN
   l_st_dt := TO_CHAR(TRUNC(p_date, 'Mon'), 'yyyymmdd');
   l_end_dt := TO_CHAR(LAST_DAY(p_date) + 1, 'yyyymmdd');
   sp_1 (l_st_dt, l_end_dt);
   sp_2 (l_st_dt, l_end_dt);
END;Then your individual procedures would look something like:
PROCEDURE SP_1 (p_st_dt  IN VARCHAR2,
                p_end_dt IN VARCHAR2) IS
BEGIN
   insert /*+ append nologging parallel(x,4)*/into destin_tbl x
   select /*+ parallel(a,4)*/ field_1, field_2, field_3
   from source_tbl@dbb_link a
   where a.date_key >= p_st_dt and a.date_key < p_end_dt -- full month (december 2010) here
     and other conditions
   commit;
END;
Regarding the queries...they do not change only in the conditions statement, but also in the retrieve.
I have 2 constant fields, whose value changes based on conditions (e.g. query_1 retrieves data regarding diesel car >speed => constant_field_1 = 'Diesel|_Car_Speed' ... query_2 retrieves data related to motorbike unleaded speed >=> constant_field_1 = 'MotorB_UL_Speed'.
These makes the grouping of these queries impossible.Without seeing actual queries, it is impossible to say, but my guess would be that the 20 queries could be reduced to a single query, or at least less than 20. Something like:
insert into destin_tbl x
select CASE WHEN condition that indicates car THEN 'Diesel|_Car_Speed'
            WHEN condition that indicates motor bike THEN 'MotorB_UL_Speed'
            WHEN other conditions THEN other field1 values END
       field_2, field_3
from source_tbl@dbb_link a
where a.date_key >= p_st_dt and
      a.date_key < p_end_dt
  and other conditionsThe conditions for the CASE statement could be pulled out of the where caluses for the individual queries.
John
Edited by: John Spencer on Jan 24, 2011 9:37 AM