|
MTI (Maintained Temporary Indexes) are system generated temporary indexes,
that exist as long as there is any access plan stored in the SQE Plan Cache.
... the MTI will disappear in either way if you run IPL.
After IPL, the next time these Indexes are needed they will generated
again which is time consuming (takes as much time as generating permanent
indexes).
If you generate (permanent) indexes for the MTIs they will stay available
and not disappear (unless they get deleted).
Also you should check if there are indexes built over the join fields and
where conditions with =
Mit freundlichen Grüßen / Best regards
Birgitta Hauser
"Shoot for the moon, even if you miss, you'll land among the stars." (Les
Brown)
"If you think education is expensive, try ignorance." (Derek Bok)
"What is worse than training your staff and losing them? Not training them
and keeping them!"
„Train people well enough so they can leave, treat them well enough so
they don't want to.“ (Richard Branson)
-----Original Message-----
From: MIDRANGE-L <midrange-l-bounces@xxxxxxxxxxxxxxxxxx> On Behalf Of
Richard Reeve
Sent: Mittwoch, 13. Oktober 2021 14:44
To: Midrange Systems Technical Discussion <midrange-l@xxxxxxxxxxxxxxxxxx>
Subject: Re: SQL optimization
This is my first shot at visual explain. It shows the creation of 4
temporary indexes. Does that indicate that I should create those 4 indexes?
All the best,
Richard Reeve
On Wed, Oct 13, 2021 at 7:38 AM Jim Oberholtzer <
midrangel@xxxxxxxxxxxxxxxxx>
wrote:
What has the optimizer suggested? Have you put this into visual explain--
to see how the optimizer is actually running the statement?
Jim Oberholtzer
Agile Technology Architects
On Oct 13, 2021, at 7:11 AM, Richard Reeve <rjrjr64@xxxxxxxxx> wrote:WHS.DBWHS_CUST_SHIP_TO=SHP.DBSHP_SHIP_TO
All,
I have this SQL statement that runs quite slow. Any idea how I
might speed this up?
SELECT
WHS.DBWHS_SHIPMENT_NBR
,WHS.DBWHS_DOC_NBR
,COR.DBCOR_ORDER_NBR
,COR.DBCOR_ORDER_TYPE
,WHL.DBWHL_DESCRIPTION
---,' ' AS sggroup
---,' ' AS sold_to-pt
,COR.DBCOR_CUST_PO_NBR
---, ' ' as fol-doc
,WHS.DBWHS_BOL_NBR
,WHS.DBWHS_WEIGHT
,WHS.DBWHS_CARTONS
,WHS.DBWHS_SHIP_DATE
,WHS.DBWHS_TRANS_ID
---,' ' as proc-id
,WHS.DBWHS_METHOD
,SHP.DBSHP_CUSTOMER
,SHP.DBSHP_NAME
,SHP.DBSHP_NAME
,SHP.DBSHP_ADDR1
,SHP.DBSHP_ADDR2
,SHP.DBSHP_CITY
,SHP.DBSHP_STATE
,SHP.DBSHP_ZIP
---,DBBLSHP.''COST CENTER
,SPC.DBSPC_COMMENT
---,'' as whn
,WDH.DBWDH_DESTINATION
,WDH.DBWDH_DEST_NAME
,SHP.DBSHP_TAX_CODE ---,' ' as tax_juris ,WDH.DBWDH_DEST_STATE
,WDH.DBWDH_DEST_CNTRY ,WDH.DBWDH_DEST_ZIP ,WHS.DBWHS_CARRIER
,VEN.DBVEN_VENDOR_VNAME---,'v' as carrier name
,WHS.DBWHS_FREIGHT_CODE---', as incoterm code ---,' ' as incoterm
description ,WHS.DBWHS_FRT_CHG_CURR ,ARH.DBARH_TRAN_AMT ---,' ' as
acct ,ACM.DBACM_CREDIT_LIM ---,' ' as pint ,WHS.DBWHS_COMPANY
,COR.DBCOR_ORDER_DATE ---,WDM.DBWDM_UPDATE_DATE ,WHS.DBWHS_STATUS
,WHS.DBWHS_SHIP_DATE ---,'LAW' as ERP-IDENTIFIER
FROM LAWDBF7B.DBWHWHS WHS
LEFT JOIN LAWDBF7B.DBWHWHL WHL ON
WHS.DBWHS_DOC_NBR=WHL.DBWHL_DOC_NBR
LEFT JOIN LAWDBF7B.DBWHWDH WDH ON
WHS.DBWHS_DOC_NBR=WDH.DBWDH_DOC_NBR
LEFT JOIN LAWDBF7B.DBBLSHP SHP ON
LEFT JOIN LAWDBF7B.DBAPVEN VEN ON WHS.DBWHS_VENDOR=VEN.DBVEN_VENDORlist
LEFT JOIN LAWDBF7B.DBBLSPC SPC ON
SHP.DBSHP_CUSTOMER=SPC.DBSPC_CUSTOMER
LEFT JOIN LAWDBF7B.DBARARH ARH ON
ARH.DBARH_CUSTOMER=SHP.DBSHP_CUSTOMER
LEFT JOIN LAWDBF7B.DBARACM ACM ON
ACM.DBACM_CUSTOMER=SHP.DBSHP_CUSTOMER
LEFT JOIN LAWDBF7B.DBBLCOR COR ON
COR.DBCOR_CUSTOMER=SHP.DBSHP_CUSTOMER
WHERE WHS.DBWHS_SHIP_DATE>='20210930' AND WHS.DBWHS_STATUS='3'
All the best,
Richard Reeve
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