Looking for ways to optimize DB2 query - db2

Question

I have a DB2 query as below. I am looking for ways to improve the speed of this one. I have tried visual explain but no indexes were advised by the index advisor. Can somebody have a look at this and advise if something can be done?
There is
CREATE OR REPLACE VIEW PSCMPORDVW
AS
WITH INPROGRESS AS
(
SELECT
DIODR#
, DIDISP
, DIUNIT
, DISTST
, DIAPRV
, DIETAD
, DITRLR AS TRAILER_ID
, DIDR1
, DIETAT
FROM
LOAD
WHERE
DIETAD <> 0
AND DIETAT <> '0000'
ORDER BY
1
)
, STOPGROUP AS
(
SELECT
SOORD STOPORDER
, COUNT(*) STOPSREMAIN
, MIN(SOSTP#) NEXTSTOP
, MAX(SOAPPR) APPTREQ
FROM
STOPOFF
INNER JOIN
INPROGRESS
ON
DIODR# = SOORD
WHERE
SOARDT = 0
GROUP BY
SOORD
ORDER BY
1
)
, STOPAPPTS AS
(
SELECT
SOORD APPTORDER
, SOCUST STOPCUST
, SOEDA ETADATE
, SOETA ETATIME
, SOADT1 EARLYDATE
, SOATM1 EARLYTIME
, SOADT2 LATEDATE
, SOATM2 LATETIME
, SOCTYC NEXTCITY
, SOSTP# APPTSTOP
, SOST NEXTSTATE
FROM
STOPOFF
INNER JOIN
STOPGROUP
ON
STOPORDER = SOORD
AND NEXTSTOP = SOSTP#
)
SELECT
ORDER_NUMBER
, SHIPPER_ID
, SHIPPER_NAME
, SHIPPER_ADDRESS_1
, SHIPPER_ADDRESS_2
, SHIPPER_CITY
, SHIPPER_ST
, SHIPPER_ZIP
, SHIPPER_ZIP_EXT
, LOAD_AT_ID
, LOAD_AT_NAME
, LOAD_AT_ADDRESS_1
, LOAD_AT_ADDRESS_2
, LOAD_AT_CITY
, LOAD_AT_ST
, LOAD_AT_ZIP
, LOAD_AT_ZIP_EXT
, LOAD_AT_LATITUDE
, LOAD_AT_LONGITUDE
, EARLY_PU_DATE_TIME
, LATE_PU_DATE_TIME
, EARLY_DELV_DATE_TIME
, EST_REVENUE
, ORDER_DIV
, CONSIGNEE_ID
, CONSIGNEE_NAME
, CONSIGNEE_ADDRESS_1
, CONSIGNEE_ADDRESS_2
, CONSIGNEE_CITY
, CONSIGNEE_ST
, CONSIGNEE_ZIP
, CONSIGNEE_ZIP_EXT
, CONSIGNEE_LATITUDE
, CONSIGNEE_LONGITUDE
, TRAILER_TYPE
, ORDER_MESSAGE
, ADDITIONAL_STOPS
, CMDTY_CODE
, CMDTY_DESCRIPTION
, ORDER_MILES
, ORDER_WGT
, ORIGIN_CITY_CODE
, ORIGIN_CITY
, ORIGIN_ST
, DEST_CITY_CODE
, DEST_CITY_NAME
, DEST_ST
, PICK_UP_AREA
, PLAN_INFO
, NUMBER_LDS
, NUMBER_DISP
, SHIP_DATE_TIME
, NEW_PICKUP_AREA
, EQUIPMENT_NUMBER
, APPT_REQ
, APPT_MADE
, PRE_T_SEQ
, PRE_T_AREA
, LOAD_DISPATCHED
, CUST_SERV_REP
, NEGOTIATIONS
,
(
CASE
WHEN UNUNIT IS NOT NULL
THEN UNUNIT
ELSE ' '
END
)
UNIT_DISPATCHED
,
(
CASE
WHEN UNSUPR IS NOT NULL
THEN UNSUPR
ELSE ' '
END
)
DRIVER_MGR_CODE
, COALESCE(SUPNAM, ' ') DRIVER_MGR_NAME
,
(
CASE
WHEN UNFMGR IS NOT NULL
THEN UNFMGR
ELSE ' '
END
)
FLEET_MGR_CODE
, COALESCE(FLTNAM, ' ') FLEET_MGR_NAME
,
(
CASE
WHEN UNTRL1 IS NOT NULL
THEN UNTRL1
ELSE ' '
END
)
TRAILER_ID
, DIDISP DISPATCH_NUMBER
, (COALESCE(BCMCNEW, ' ')) FED_MC_ID
, DIUNIT DISPATCHED_UNIT
, CASE
WHEN UNETAD <> 0
AND UNETAT = ''
THEN CVTDATETIM(CHAR(UNETAD),'0000', (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN UNETAD <> 0
THEN CVTDATETIM(CHAR(UNETAD),UNETAT, (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN UNETAD = 0
THEN '0000-00-00T00:00:00-00:00'
END AS ETA_DATE_TIME
, NEXTSTOP
, CASE
WHEN SOARDT <> 0
AND SOARTM = ''
THEN CVTDATETIM(CHAR(SOARDT),'0000', (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN SOARDT <> 0
THEN CVTDATETIM(CHAR(SOARDT),SOARTM, (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN SOARDT = 0
THEN '0000-00-00T00:00:00-00:00'
END AS STOP_ARRIVAL_DATE_TIME
, CASE
WHEN SOLUDT <> 0
AND SOLUTM = ''
THEN CVTDATETIM(CHAR(SOLUDT),'0000', (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN SOLUDT <> 0
THEN CVTDATETIM(CHAR(SOLUDT),SOLUTM, (
SELECT
SUBSTR(DATA_AREA_VALUE, 1109, 2) AS TIMEZONE
FROM
TABLE(QSYS2.DATA_AREA_INFO('COMPAN', '*LIBL'))
)
)
WHEN SOLUDT = 0
THEN '0000-00-00T00:00:00-00:00'
END AS STOP_DEPART_DATE_TIME
, ORBAMT ORDER_INV_AMT
, ORARST AR_STATUS_FLAG
, DISTST SETTLEMENT_FLAG
, DIAPRV APPROVED_FOR_PAY
, BCCARR CARRIER_CODE
, BCNAME CARRIER_NAME
, BCADDR CARRIER_ADDRESS_1
, BCADR2 CARRIER_ADDRESS_2
, BCCITY CARRIER_CITY
, BCST CARRIER_ST
, BCZIP CARRIER_ZIP
FROM
INPROGRESS
INNER JOIN
PSMAINORVW A
ON
DIODR# = ORDER_NUMBER
AND DIDISP = NUMBER_DISP
AND
(
SUBSTR(ORDER_NUMBER, 1, 2) <> 'DH'
AND SUBSTR(ORDER_NUMBER, 1, 1) <> 'M'
)
LEFT OUTER JOIN
STOPOFF
ON
DIODR# = SOORD
AND SOSTP# = 90
LEFT OUTER JOIN
LMCARR
ON
DIUNIT = BCCARR
LEFT OUTER JOIN
MMILES
ON
MMORD# = DIODR#
AND MMRECTYPE = 'D'
AND MMDSP# = DIDISP
EXCEPTION JOIN
ORDBILL B
ON
B.ORODR# = DIODR#
AND B.ORSEQ = ' '
AND ORARST = '1'
LEFT OUTER JOIN
STOPGROUP
ON
STOPORDER = DIODR#
LEFT OUTER JOIN
STOPAPPTS
ON
APPTORDER = STOPORDER
AND APPTSTOP = NEXTSTOP
LEFT OUTER JOIN
UNITS
ON
UNUNIT = DIUNIT
AND UNORD# = ORDER_NUMBER
LEFT OUTER JOIN
SUPMAST
ON
SUPCDE = UNSUPR
LEFT OUTER JOIN
FLTMAST
ON
UNFMGR = FLTCDE
WHERE
DIETAD <> 0
AND DIETAT <> '0000'
RCDFMT PSCMPORDVW ;
I suspect that the below part might be slowing it up. Can someone advise what can be done here?
STOPGROUP AS
(
SELECT
SOORD STOPORDER
, COUNT(*) STOPSREMAIN
, MIN(SOSTP#) NEXTSTOP
, MAX(SOAPPR) APPTREQ
FROM
STOPOFF
INNER JOIN
INPROGRESS
ON
DIODR# = SOORD
WHERE
SOARDT = 0
GROUP BY
SOORD
ORDER BY
1
)

Answer 1

Even though Visual Explain (VE) doesn't advise any indexes ... it can still be used to see how long various parts of your query are taking.
If the
SELECT
SOORD STOPORDER
, COUNT(*) STOPSREMAIN
, MIN(SOSTP#) NEXTSTOP
, MAX(SOAPPR) APPTREQ
Turns out to really be any issue, I'd look at using an Encoded Vector Index (EVI) with aggregate values to speed that up.
I'd suggest breaking it down and building back up while using VE to see where the issues lie.
The only magic wand I might suggest is putting code into a user defined table function (UDTF); assuming you currently plan to use the view like so:
select *
from myview
where something = 'somevalue';
A UDTF would allow for you to explicitly push the selection into the query
select *
from table ( myudtf('somevalue'));