DB2 for z/OS V8 - Guide Share France

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Datawarehouse Need to improve per<strong>for</strong>mance of critical query Query: 10 tables involved in a multiple join can be improved by the use of a MQT Validate the REFRESH needs <strong>for</strong> the MQT and schedule it The created MQT needs to be validated need to determine which part of the query is fix and which part is variable (local predicates) © 2007 MConsulting - cristian@molaro.be 52
Original query: SELECT DISTINCT(REP.REPID) representativeId, REP_LOC.LOCATIONID locationId, REP_PROD.PRODUCTID productId FROM EIS.REP_REPRESENTATIVE REP join EIS.REP_LOCATION REP_LOC on REP.REPID=REP_LOC.REPID AND REP_LOC.STATUSID=1 AND REP_LOC.PRODUCTDIFFERENTIATIONFLAG = 1 left join EIS.GEN_CITY CITY on CITY.cityId = REP_LOC.cityId join EIS.REPPRODUCTCONFIG REP_PROD on REP.REPID = REP_PROD.REPID AND REP_PROD.STATUSID=1 join EIS.LOCPRODUCTCONFIG REP_LOC_PROD on REP_PROD.PRODUCTCONFIGID = REP_LOC_PROD.PRODUCTCONFIGID AND REP_LOC.LOCATIONID = REP_LOC_PROD.LOCATIONID AND REP_LOC_PROD.STATUSID=1 AND REP_LOC_PROD.CURRENCYDIFFFLAG=2 join EIS.PRDCURRENCYCONFIG REP_LOC_CURR on REP_LOC_CURR.STATUSID=1 AND REP_LOC_PROD.PRODUCTCONFIGID = REP_LOC_CURR.PRODUCTCONFIGID AND REP_LOC_CURR.LOCATIONCONFIGID IS NULL AND REP_LOC_CURR.OPERATORCONFIGID IS NULL join EIS.MTCURRENCYCONFIG REP_MT_CURR on REP_LOC_CURR.PRODUCTCURRENCYID=REP_MT_CURR.PRODUCTCURRENCYID join EIS.GEN_PRODUCT GEN_SERVICE on GEN_SERVICE.PARENTPRODUCTID=REP_PROD.PRODUCTID join EIS.REPPRODUCTSERVICES REP_SERV on REP_PROD.PRODUCTCONFIGID = REP_SERV.PRODUCTCONFIGID AND REP_SERV.SERVICEID=GEN_SERVICE.PRODUCTID AND REP_SERV.STATUSID=1 join EIS.LOCPRODUCTSERVICES REP_LOC_SERV on REP_SERV.SERVICEID=REP_LOC_SERV.SERVICEID AND REP_LOC_PROD.LOCATIONCONFIGID=REP_LOC_SERV.LOCATIONCONFIGID AND REP_LOC_SERV.STATUSID=1 WHERE REP.STATUSID=1 AND REP_MT_CURR.DIRECTION IN (2,3) AND REP_LOC.COUNTRYID=32 AND REP_PROD.PRODUCTID=2 AND CITY.NAME LIKE 'CONCEI%O DO ARAGUAIA%' AND GEN_SERVICE.productid IN (102) GROUP BY REP.REPID, REP_LOC.LOCATIONID, REP_PROD.PRODUCTID HAVING count(*)=1 ORDER BY REP.REPID, REP_LOC.LOCATIONID, REP_PROD.PRODUCTID © 2007 MConsulting - cristian@molaro.be 53
Page 1 and 2: Cristian Molaro MConsulting BELGIUM
Page 3 and 4: © 2007 MConsulting - cristian@mola
Page 5 and 6: Critical APAR: ====================
Page 9 and 10: DFSORT is mandatory for IBM utiliti
Page 11 and 12: SPAS stored procedures not longer s
Page 13 and 14: WLM address space fails at start: D
Page 17 and 18: CM EN FM NF M CM EN FM NF M NF M CM
Page 19 and 20: DSN TRKS CYLS DB TS CI Size RECORDS
Page 21 and 22: Total elapsed time = 5 min Copies
Page 23 and 24: Compare EXPLAIN tables V7 vs. V8:
Page 27 and 28: 64 bits addressing is NOT the solut
Page 29 and 30: STATISTICS EXEC REPORT DDNAME(STATS
Page 31 and 32: Paul Fletcher’s REXX for READS an
Page 33 and 34: IBM published CPU expected changes
Page 35 and 36: Rebind all packages/plans Multi-ro
Page 37 and 38: New in V8: BACKUP SYSTEM RESTORE
Page 39 and 40: Define separate ICF Catalogs User
Page 41 and 42: Creates full volume dasd copies of
Page 43 and 44: Restores DB2 system to specified po
Page 45 and 46: Good news: sliding secondary alloca
Page 47 and 48: Default PRIQTY 1 cylinder for non-
Page 49 and 50: INSTALL DB2 - SIZES PANEL 2 ===> Ch
Page 51: Materialized Query Tables = MQTs T
Page 55 and 56: MQT creation: CREATE TABLE MQT.TEST
Page 57 and 58: New access path: © 2007 MConsultin
Page 59 and 60: New in V8: Statistics Advisor Lis
Page 63 and 64: zIIPs NOT PADDED Indexes Backwards
Page 65 and 66: Moving to V8 is good Take document

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