Creating collection vs. materialized view - better performance?

Question

Hi, I am trying to improve the performance of our application and am looking at everything possible. I am wondering if the use of multiple, complex collections is slowing down our application. Would the use of materialized views, as opposed to collections improve things? thanks Karen

Answer 1

to provide more info....
here is the process which creates the list of species based on favorite species identified (and followed by the query to select from this collection)
declare
yes_are NUMBER;
pCount NUMBER;
l_seq_id NUMBER;
yes_hms NUMBER;
found_area NUMBER;
found_unit NUMBER;
unitmeasure VARCHAR2(2);
pbCount NUMBER;
pbPrice NUMBER;
begin
--create license collection so that if error on a submit the information retains
if apex_collection.collection_exists('LICENSE_COLLECTION') then
apex_collection.delete_collection('LICENSE_COLLECTION');
end if;
--create vessel collection so that if error on a submit the information retains
if apex_collection.collection_exists('SUPVES_COLLECTION') then
apex_collection.delete_collection('SUPVES_COLLECTION');
end if;
apex_collection.create_or_truncate_collection('FP_COLLECTION');
--create collection to save landings
apex_collection.create_or_truncate_collection('SPECIES_COLLECTION');
--loop through the favorite species and populate with pre-existing data
for rec IN (select *
from frequent_species
where permit_id = :G_PERMIT_ID
order by fav_order)
LOOP
-- check to see if there is a priceboard entry for the favorite species
select count(*) into pbCount
from price_board
where permit_id = :G_PERMIT_ID and
species_itis = rec.species_itis and
grade_code = rec.grade_code and
market_code = rec.market_code and
unit_of_measure = rec.unit_measure and
price is not null;
-- if there is a price board entry
if pbCount = 1 then
--get the default price for that species combination
select price into pbPrice
from price_board
where permit_id = :G_PERMIT_ID and
species_itis = rec.species_itis and
grade_code = rec.grade_code and
market_code = rec.market_code and
unit_of_measure = rec.unit_measure and
price is not null;
--add landings row with price board data
l_seq_id := apex_collection.add_member('SPECIES_COLLECTION',
null,
null,
null,
rec.species_itis,
rec.grade_code,
rec.market_code,
rec.unit_measure,
nvl(rec.disposition_code,:G_FIRST_DISPOSITION),
0, null,pbPrice,null);
-- no price board entry
else
-- add landings row without any priceboard data
l_seq_id := apex_collection.add_member('SPECIES_COLLECTION',
null,
null,
null,
rec.species_itis,
rec.grade_code,
rec.market_code,
rec.unit_measure,
nvl(rec.disposition_code,:G_FIRST_DISPOSITION),
0, null,null,null);
end if;
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>14,
p_attr_value => 'ERROR');
--set first disposition
:G_FIRST_DISPOSITION := nvl(rec.disposition_code,:G_FIRST_DISPOSITION);
found_area:=0;
-- All rows need to be checked to determine if additional info is needed based on partner_options table
-- check if AREA will be needed
select count(*) into found_area
from partner_options
where partner_id = :G_ISSUING_AGENCY and
substr(species_itis,1,6) = rec.species_itis and
option_type = 'ARE' and
nvl(inactivate_option_date, sysdate) >= sysdate;
-- landing row requires AREA data
if found_area > 0 then
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>13,
p_attr_value => 'Y');
-- landing row does NOT require AREA data
else
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>13,
p_attr_value => 'N');
end if;
found_unit := 0;
-- check if COUNT will be needed
select count(*) into found_unit
from partner_options
where partner_id = :G_ISSUING_AGENCY and
substr(species_itis,1,6) = rec.species_itis and
option_type = 'LBC' and
nvl(inactivate_option_date, sysdate) >= sysdate;
-- landing row requires UNIT data
if found_unit > 0 then
select unit_measure into unitmeasure
from partner_options
where partner_id = :G_ISSUING_AGENCY and
substr(species_itis,1,6) = rec.species_itis and
option_type = 'LBC' and nvl(inactivate_option_date, sysdate) >= sysdate;
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>17,
p_attr_value => 'Y');
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>19,
p_attr_value => unitmeasure);
--landing row does NOT require UNIT data
else
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq => l_seq_id,
p_attr_number =>17,
p_attr_value => 'N');
end if;
-- check if HMS
SELECT count(*) into yes_hms
FROM HMSSpecies a
where hmsspeciesitis = rec.species_itis;
-- landing row requires HMS data
if yes_hms > 0 and rec.grade_code = '10' then
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq=> l_seq_id,
p_attr_number=>20,
p_attr_value=>'Y');
else
-- landing row does NOT require HMS data
apex_collection.update_member_attribute(p_collection_name=>'SPECIES_COLLECTION',
p_seq=> l_seq_id,
p_attr_number=>20,
p_attr_value=>'N');
end if;
end loop;
end;
and the query for the region:
SELECT
apex_item.text(1,seq_id,'','','id="f01_#ROWNUM#"','','') "DeleteRow",
apex_item.text_from_LOV(c004,'SPECIES')||'-'||apex_item.text_from_LOV(c005,'GRADE')||'-'||apex_item.text_from_LOV(c006,'MARKETCODE')||'-'||apex_item.text_from_LOV_query(c007,'select unit_of_measure d, unit_of_measure r from species_qc') unit,
apex_item.select_list_from_LOV(6,c008,'DISPOSITIONS','onchange="getAllDisposition(#ROWNUM#)"','YES','0',' -- Select Favorite -- ','f06_#ROWNUM#','') Disposition,
apex_item.select_list_from_LOV(7,c009,'GEARS','style="background-color:#FBEC5D; "onFocus="checkGearPreviousFocus(#ROWNUM#);"onchange="getAllGears(#ROWNUM#)"','YES','0','-- Select Favorite --','f07_#ROWNUM#','') Gear,
apex_item.text(8,TO_NUMBER(c010),5,null,'onchange="setTotal(#ROWNUM#)"','f08_#ROWNUM#','') Quantity,
apex_item.text(9,TO_NUMBER(c011),5,null,'onchange="getPriceBoundaries(#ROWNUM#)"','f09_#ROWNUM#','') Price,
apex_item.text(10, TO_NUMBER(c012),5,null, 'onchange="changePrice(#ROWNUM#)" onKeyPress="selectDollarsFocus(#ROWNUM#);"','f10_#ROWNUM#','') Dollars,
apex_item.select_list_from_LOV_XL(11, c014,'AREAFISHED','style="background-color:#FBEC5D; "onchange="getAllAreaFished(#ROWNUM#)"','YES','ERROR','-- Select Area Fished --','f11_#ROWNUM#','') Area_Fished,
apex_item.text(12, c018,4,null,'style="background-color:#FBEC5D; "onBlur="setUnitQuantity(#ROWNUM#)"','f12_#ROWNUM#','') UNIT_QUANTITY,
apex_item.text(13, 'CN',3,null,'readOnly=readOnly','f13_#ROWNUM#','') UNIT_COUNT,
apex_item.checkbox(14,'Y','id="f14_#ROWNUM#" style="background-color:#FBEC5D; " onClick="alterYes(#ROWNUM#);" onKeyPress="alterYes(#ROWNUM#);"',c021) FinsAttached,
apex_item.checkbox(15,'N','id="f15_#ROWNUM#" style="background-color:#FBEC5D; " onClick="alterNo(#ROWNUM#);" onKeyPress="alterNo(#ROWNUM#);"',c022) FinsNotAttached,
apex_item.checkbox(16,'U','id="f16_#ROWNUM#" style="background-color:#FBEC5D; " onClick="alterUnk(#ROWNUM#);" onKeyPress="alterUnk(#ROWNUM#);"',c023) FinsUnknown
from apex_collections
where collection_name = 'SPECIES_COLLECTION' order by seq_id
/