DB2 for z/OS V8 - Guide Share France

Cristian Molaro 

MConsulting BELGIUM 

Réunion du Guide DB2 pour z/OS 

France 

Jeudi 22 novembre 2007 

Immeuble CA, Paris-La Défense

Cristian Molaro is a DB2 System engineer who 

works as a consultant in Belgium. 

His main activity is linked to the DB2 for z/OS 

administration and performance monitoring and 

tuning. 

He is an IBM Certified Professional, graduated in 

Chemical Engineering and has a Postgraduate in 

Management Sciences. 

Cristian is a former IDUG and GSE speaker. 

© 2007 MConsulting - cristian@molaro.be 2


As much as you can 

http://www.ibm.com/software/data/db2/zos 

Installation Guide 

Migration Informational APAR II13695 

Unicode Informational APAR II13048 & II13049 

DB2 UDB for z/OS V8 Migration: An Ironman® event 

SG24-6465: DB2 for z/OS Performance Topics 

SG24-6079: DB2 V8, Everything you ever wanted to know... 

IDUG DB2LIST 

... 


Critical APAR: 

============================================================ 

SECTION 1: Toleration, Coexistance and Compatibility PTFs. 

============================================================ 

5740XYR00 R810 

DB2 V7.1 MIGRATION/FALLBACK INFOAPAR TO/FROM DB2 V8.1 

AND UPGRADE V710 

FOLLOWING PTFS ARE REQUIRED FOR DB2 V7.1 & V8.1 BEFORE 

MIGRATION: 

DB2 system administrator should take a back up from DB2 

environment (SMP/E, Active logs, BSDSs, DB2 Catalog/Directory) 

before applying maintenance. 

Remove any ZAPed (modified) DB2 module/s (lmod) by OEM from 

load libraries of a single DB2 subsystem or entire DataSharing 

group before starting DB2 with following maintenance. 

Vanilla IBM DB2 load modules are needed for processing. 

PQ48486/UQ81009(0310) Toleration of fallback from DB2 Version 8 

...... 

PQ84421/UQ85439(0403) adds a new job DSNTIJP8 to V7. 





DFSORT is mandatory for IBM utilities 

DSNU000I 

DSNU1044I 

DSNU1640I 

DSNUGUTC - OUTPUT START FOR UTILITY, UTILID = PRD.REORGUP 

DSNUGTIS - PROCESSING SYSIN AS EBCDIC 

DSNUGUTC - Z/OS DFSORT LOAD MODULE NOT LOADED. 

DSNU012I DSNUGBAC - UTILITY EXECUTION TERMINATED, HIGHEST RETURN CODE=8 

If missing, it will not work 

Special licence for DB2 usage 

Shipped with z/OS 

May need to add a STEPLIB to JCL IBM utilities 

Does not affect non IBM utilities 


Use alias in PROCs, JCLs, etc 

Simplifies next migration and fallback 

Target library must be APF (when applicable) 

Security applied on target library 

DSLIST - Data Sets Matching DWA1LIB.* Row 1 of 10 

Command ===> 

Scroll ===> PAGE 

Command - Enter "/" to select action Message Volume 

------------------------------------------------------------------------------- 

DWA1LIB.SDSNEXIT 

*ALIAS 

DWA1LIB.SDSNLOAD 

*ALIAS 

DWA1LIB.SDSNLOD2 

*ALIAS 

DWA1LIB.V7.SDSNEXIT 

IC23A3 

DWA1LIB.V7.SDSNLOAD 

IC23A3 

DWA1LIB.V7.SDSNLOD2 

IC23A3 

DWA1LIB.V8.SDSNEXIT 

IC23AA 

DWA1LIB.V8.SDSNLOAD 

IC23AA 

DWA1LIB.V8.SDSNLOD2 

IC23AA 

***************************** End of Data Set list **************************** 


SPAS stored procedures not longer supported 

In CM use V7 version or get -4700 

JDBC & ODBC: DSNTIJMS 

Best performance: NUMTCB > 1 

Control Center: DSNTIJCC 

Tools: Only SP part of DSNTIJSG 

Care on distributing SP to WLM Environments 

XML SP 

MQ Series SP 


WLM ENV 

NAME NUMTCB 

APF 

Authorized Pourpose Origin Description Notes 

WLMENV1 40 YES DB2DEBUG.SYS* 

SQLJ.INSTALL_JAR 

SQLJ.REPLACE_JAR 

SQLJ.REMOVE_JAR 

SYSIBM.SQL* 

SYSPROC.WLM_REFRESH 

SYSPROC.DSNTJSPP + STORED 

PROCEDURES + Control Center 

DSNTIJSD 

DSNTIJSG 

DSNTIJSG 

DSNTIJSG 

DSNTIJSG 

DSNTIJSG 

DSNTIJSG + 

DSNTIJMS + 

DSNTIJCC 

DB2 Supplied stored procedures Must be autorized for 

WLM_REFRESH 

WLMENV2 1 NO SYSPROC.DSNTPSMP 

SYSPROC.DSNTBIND 

SYSPROC.DSNACCTS 

DSNTIJSG 

DSNTIJSG 

REXX requires NUMTCB=1 

WLMENV3 40 NO User SQL stored procedures Created manually 

or by using DB2 

Development Center or 

Stored Procedure 

Builder 

WLMENV4 8 NO User Java stored procedures Created manually 

or by using DB2 

Development Center or 

Stored Procedure 

Builder 

Check for DSNX993I error 

message in case of problems 

SHOULD have at least ONE 

unauthorized data set 

SHOULD have at least ONE 

unauthorized data set. 

One JVM is loaded for each 

NUMTCB 

specified. The presence of 

the //JAVAENV in the JCL 

causes the JVM to be loaded 

WLMENV5 1 YES DSNUTILS Allows the execution of DB2 

utilities 

NTMTCB=1 is mandatory 


WLM address space fails at start: 

DMA1WLM IEF403I DMA1WLM - STARTED - TIME=15.14.45 

CNTEROC #IEF403I (J1WLM) DMA1WLM - STARTED - TIME=15.14.45 

DMA1WLM DSNX967I DSNX9WLM ATTEMPT TO PERFORM WLM FUNCTION IWMCONN FAILED 

DMA1WLM WITH WLM RC = 0000000C RSN = 11580C1A SSN = 

Missing WLM environment definition: 

EJES510 USER-ESAMIL--/VARY WLM,APPLENV=WLMENV1,REFRESH 

WLMENV1,REFRESH 

IWM030I VARY REFRESH FOR WLMENV1 REJECTED, APPLICATION ENVIRONMENT NOT 

DEFINED 

Missing RRS: 

CNTEROC #IEF403I (J1WLM) DMA1WLM - STARTED - TIME=16.01.32 

DMA1WLM DSNX982I DSNX9WLM ATTEMPT TO PERFORM RRS ATTACH FUNCTION SPAS_I 

DMA1WLM 

FAILED WITH RRS RC = 00000008 RSN = 00F30091 SSN = DMA1 

DMA1WLM PROC= DMA1WLM ASID = 013D WLM_ENV = DMA1WLM 

..... 

DSN3029I -DMA1 DSN3RRRS RRS ATTACH PROCESSING IS AVAILABLE 


DSNUTILS: 

//DDA1WLM PROC RGN=0K,APPLENV=WLMDDA1ENV5,DB2SSN=DDA1,NUMTCB=1 

//IEFPROC EXEC PGM=DSNX9WLM,REGION=&RGN,TIME=NOLIMIT, 

// PARM='&DB2SSN,&NUMTCB,&APPLENV' 

//STEPLIB DD DISP=SHR,DSN=DDA1SOFT.RUNLIB.LOAD 

// DD DISP=SHR,DSN=DDA1LIB.SDSNLOAD 

//UTPRINT DD SYSOUT=* 

//RNPRIN01 DD SYSOUT=* 

//DSSPRINT DD SYSOUT=* 

//SYSIN DD UNIT=SYSDA,SPACE=(4000,(20,20),,,ROUND) 

//SYSPRINT DD UNIT=SYSDA,SPACE=(4000,(20,20),,,ROUND) 

REXX: 

//DDA1WLM PROC RGN=0K,APPLENV=WLMDDA1ENV2,DB2SSN=DDA1,NUMTCB=1 

//IEFPROC EXEC PGM=DSNX9WLM,REGION=&RGN,TIME=NOLIMIT, 

// PARM='&DB2SSN,&NUMTCB,&APPLENV' 

//SYSEXEC DD DISP=SHR,DSN=DDA1SOFT.V8.SDSNCLST 

//STEPLIB DD DISP=SHR,DSN=DDA1SOFT.RUNLIB.LOAD 

// DD DISP=SHR,DSN=DDA1LIB.SDSNLOAD 

//SYSTSPRT DD SYSOUT=* 




CM 

EN 

FM 

NF 

M 

CM 

EN 

FM 

NF 

M 

NF 

M 

CM 

EN 

FM 

NF 

M 

NF 

M 

CM 

EN 

FM 

NF 

M 

NF 

M 

CM 

EN 

FM 

NF 

M 


FUNCTION = ENABLE NEW FUNCTION 

MODE PROCESSING 

It is the longest job in ENFM 

REORG Catalog and Directory 

Critical: verify number of RECORDS in 

VSAM definitions 

Will fail if user defined indexes on Catalog 

but missing SHADOW dataset in JCL 


DSN TRKS CYLS DB TS CI Size RECORDS 

CAT.DSNDBD.DSNDB06.SYSPKAGE.I0001.A001 2250 150 DSNDB06 SYSPKAGE 4096 27000 

CAT.DSNDBD.DSNDB01.SYSLGRNX.I0001.A001 1500 100 DSNDB01 SYSLGRNX 4096 18000 

CAT.DSNDBD.DSNDB06.DSNKSX01.I0001.A001 1125 75 DSNDB06 DSNKSX01 4096 13500 

CAT.DSNDBD.DSNDB01.DSNSPT02.I0001.A001 750 50 DSNDB01 DSNSPT02 4096 9000 

CAT.DSNDBD.DSNDB06.SYSDBASE.I0001.A001 750 50 DSNDB06 SYSDBASE 4096 9000 

CAT.DSNDBD.DSNDB06.SYSCOPY.I0001.A001 450 30 DSNDB06 SYSCOPY 4096 5400 

CAT.DSNDBD.DSNDB01.DBD01.I0001.A001 375 25 DSNDB01 DBD01 4096 4500 

CAT.DSNDBD.DSNDB01.DSNLLX01.I0001.A001 375 25 DSNDB01 DSNLLX01 4096 4500 

CAT.DSNDBD.DSNDB01.DSNSPT01.I0001.A001 375 25 DSNDB01 DSNSPT01 4096 4500 

CAT.DSNDBD.DSNDB01.SCT02.I0001.A001 375 25 DSNDB01 SCT02 4096 4500 

CAT.DSNDBD.DSNDB06.SYSPLAN.I0001.A001 375 25 DSNDB06 SYSPLAN 4096 4500 

RECORDS = (CI Size/4096)*12*Trks 


Verify and eventually update RECORDS 

Special attention to SYSSPT01 

//ENFM0113 EXEC PGM=IDCAMS,COND=(2,LE,ENFM0110) 

//DATADEV DD UNIT=3390,DISP=OLD,VOL=SER=PR23A3 

//INDEXDEV DD UNIT=3390,DISP=OLD,VOL=SER=PR23A3 

//SYSPRINT DD SYSOUT=* 

//SYSUDUMP DD SYSOUT=* 

//SYSIN DD * 

DEFINE CLUSTER - 

( NAME(DPA1CAT.DSNDBC.DSNDB06.SYSPKAGE.J0001.A001) - 

FILE(DATADEV) - 

LINEAR - 

REUSE - 

VOLUMES(PR23A3) - 

RECORDS(27000 27000) - 

SHAREOPTIONS(3 3) ) - 

DATA - 

( NAME(DPA1CAT.DSNDBD.DSNDB06.SYSPKAGE.J0001.A001) - 

) CATALOG(DPA1CAT) 


Total elapsed time = 5 min 

Copies were done on TAPE 

RC = 1 [CHECK THE NFM STATUS OF SYSSPT01] 


Why? 

SPROC are invalidated in V8 before rebind 

Get V8 optimizer benefits 

Data types mismatches become stage 1 

Need to perform a controlled REBIND process 

No need to REBIND in NFM 

Have a list of critical packages to verify 

Must see the difference of an access path change 

because an application change 

A single worse statement avoids package rebind 


Compare EXPLAIN tables V7 vs. V8: 

If Cost increases: 

If Cost stays the same: 

If Cost decreases: 

investigate 

rebind 

rebind 

Create a baseline in V7 in dummy collection if not 

EXPLAIN = YES 

Use DSNTESC to create tables: 

PLAN_TABLE 

DSN_FUNCTION_TABLE 

DSN_STATEMNT_TABLE 

DSN_STATEMENT_CACHE_TABLE 


Execution statistics 

-------------------- 

Total number of impacted plan_table rows 362953 

Number of processed packages 2994 

Number of changed plan_table rows 6607 

Number of cost changes 23143 

---------------------- 

Cost increases 3001 

Cost decreases/is the same 20142 



V7 

For logged user (TSO/SDSF): id passed through for 

console commands = SYSOPR 

Zparm SYSOPRn=SYSOPR allows any user to enter 

commands from console 

V8 

For logged on user: id passed through for console 

commands is now the user and not SYSOPR 

Console operator could be unable to operate DB2 

RACF groups and secondary authids supported in 

V8 


64 bits addressing is NOT the solution to ALL the VS 

problems Still need to work on VSCR 

Some structures remain under the bar or the line 

Only IRLM and DBM1 address spaces exploit 64-bit 

addressing 

Several critical storage pools above 2GB bar, i.e. BPOOLS 

Thread related storage stays below the bar & Thread 

footprint increases 30% - 70% 

Look after REAL storage, not only VIRTUAL storage 

Observed increase about 3% depends on usage 

 

ftp://ftp.software.ibm.com/software/data/db2zos/DB2VSTORprez.pdf 


V7: Start IFCID 225 destination SMF if not yet done 

-START TRACE(STAT) DEST(SMF) CLASS(6) IFCID(225) 

DSNW127I -DAC1 CURRENT TRACE ACTIVITY IS - 

TNO TYPE CLASS DEST QUAL 

01 STAT 01,03,04,05, SMF NO 

01 06 

02 ACCTG 01,02,03 SMF NO 

*********END OF DISPLAY TRACE SUMMARY DATA********* 

Tiny overhead 

PQ99658: 

System parameter STATIME default time is reduced from 30 

minutes to 5 

IFCID 225 is added to STATISTICS trace class 1 


STATISTICS 

EXEC 

REPORT 

DDNAME(STATSDD) 

LAYOUT(LONG) 

LOCATION: DBGP DB2 PERFORMANCE MONITOR (V4 ) PAGE: 2-10 

GROUP: N/P STATISTICS REPORT - LONG REQUESTED FROM: NOT SPECIFIED 

MEMBER: N/P 

TO: NOT SPECIFIED 

SUBSYSTEM: DBPX INTERVAL FROM: 11/16/07 

DB2 VERSION: V8 SCOPE: MEMBER TO: 11/18/07 

DBM1 AND MVS STORAGE BELOW 2 GB QUANTITY DBM1 AND MVS STORAGE BELOW 2 GB QUANTITY 

---------------------------------------- ---------- --------------------------------------- ----------- 

TOTAL DBM1 STORAGE BELOW 2 GB (MB) 126.39 24 BIT LOW PRIVATE (MB) 0.21 

TOTAL GETMAINED STORAGE (MB) 118.22 24 BIT HIGH PRIVATE (MB) 0.34 

VIRTUAL BUFFER POOLS (MB) N/A 31 BIT EXTENDED LOW PRIVATE (MB) 31.41 

VIRTUAL POOL CONTROL BLOCKS (MB) N/A 31 BIT EXTENDED HIGH PRIVATE (MB) 142.20 

EDM POOL (MB) 117.19 EXTENDED REGION SIZE (MAX) (MB) 1643.00 

COMPRESSION DICTIONARY (MB) N/A EXTENDED CSA SIZE (MB) 244.28 

… 

DBM1 STORAGE ABOVE 2 GB QUANTITY REAL AND AUXILIARY STORAGE QUANTITY 

--------------------------------------- ----------- --------------------------------------- ----------- 

FIXED STORAGE (MB) 0.01 REAL STORAGE IN USE (MB) 115.68 

GETMAINED STORAGE (MB) 164.21 AUXILIARY STORAGE IN USE (MB) 0.00 

COMPRESSION DICTIONARY (MB) 0.12 

CACHED DYNSQL STATEMENTS (MAX) (MB) 52.89 

DBD CACHE (MAX) (MB) 52.89 

PAGES HELD BY DBDS 216.20 

… 


WARNING: check activity @ snapshot 

Should consider trends 


Paul Fletcher’s REXX for READS and gather IFC225 

fletchpl@uk.ibm.com 

Can be used for long term monitoring 


500MB = GREEN 

200-500MB = AMBER 

IBM published CPU expected changes considering 

no use of new V8 features 

-20% -10% 

0% 

+10% +20% 


IBM objective for regression is less than 10% 

Not only Acctg Class 2 increase expected 

Must consider CPU reduction in DB2 system 

address spaces 


Rebind all packages/plans 

Multi-row FETCH and INSERT 

MQTs 

Increase size of buffer pools 

Long term page fix buffer pools 

Fix the buffer pages once in memory and keep them fixed in real 

storage 

0% to 8% CPU savings 

Only if enough real storage to back bpools 100% 

Activated by -ALTER BPOOL(x) PGFIX(YES) 

Performance benefit is inversely proportional to the buffer hit ratio: 

○ The higher the hit ratio, the lower the benefit 

○ Apply to small buffer pools with lots of I/Os 



New in V8: 

BACKUP SYSTEM 

RESTORE SYSTEM 

Not supported in CM 

Scenarios: 

Backup entire DB2 system. 

System-level PITR for logical DR: BACKUP SYSTEM DATA ONLY 

Physical DR: BACKUP SYSTEM FULL 

System cloning 

Backup outside of DB2 using DFSMShsm commands 

New in V9 + z/OS 1.8: Restore DB2 objects from volume 

dumps you can prepare now to get advantage 


The migration process is a good opportunity for preparing 

to Backup and Restore System 

Consider to apply systematicly to new DB2s 

Has impact on Storage Management 

Requires: 

Definition of 2 SMS Copy Pools for data and logs 

○ DSN$locn-name$DB for data 

○ DSN$locn-name$LG for log 

Definition of SMS Copy Pool Backup storage group 

SMS managed datasets: including DB2 catalog & 

directory + logs 

○ Log placement: use Guaranteed Space for volume allocation + 

EF for striping 


Define separate ICF Catalogs 

User data, DB2 catalog and directory 

Logs (optionally system load libraries) 

Define SMS Storage Groups 

For user data 

For the DB2 Catalog & Directory and the ICFCTLG 

For the DB2 logs, BSDS and the ICFCTLG 


VLG001 VLG002 VLG00n 

DB2 Logs and BSDS 

ICFCTLG 

UCAT.PC1.DB2LG 

VSY001 VSY002 VSY00n 

DB2 Catalog and Directory 

DSNDB04 

DSNDB07 

ICFCTLG 

UCAT.PC1.DB2SY 

VDB001 VDB002 VDB00n 

Bussiness Data 

Defined on ICFCTLG 

UCAT.PC1.DB2SY 

Storage group 

SGP1LG 

Storage group 

SGP1SY 

Storage group 

SGP1UD 

Copy pool 

DSN$DPC1$LG 

Copy pool 

DSN$DPC1$DB 

CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn 

CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn CPVnnn 

Copy pool backup storage group 


Creates full volume dasd copies of the DB2 

subsystem 

Replaces the –set log suspend + –set 

log resume method 

BACKUP SYSTEM FULL or BACKUP SYSTEM DATA 

ONLY 

SYSCTRL or SYSADM authority required 

DB2 does not take any quiesce points 

BSDS Backup History is updated 

DB2 keeps track of 50 backups in the BSDS 


DSNU000I DSNUGUTC -OUTPUT START FOR UTILITY, UTILID = PRD.BKUPSYS 

DSNU1044I DSNUGTIS -PROCESSING SYSIN AS EBCDIC 

DSNU050I DSNUGUTC -BACKUP SYSTEM FULL 

DSNU1600I DSNUVBBD -BACKUP SYSTEM UTILITY FOR DATA STARTING, 

COPYPOOL = DSN$PRD$DB 

TOKEN = X'E7F9F6C1BAAF725F60A7E106001C3D582090'. 

DSNU1614I DSNUVBBD -BACKUP SYSTEM UTILITY FOR DATA COMPLETED SUCCESSFULLY, 


TOKEN = X'E7F9F6C1BAAF725F60A7E106001C3D582090' 

ELAPSED TIME = 00:00:23. 

BACKUP SYSTEM UTILITY HISTORY 

SUBSYSTEM ID PRD 

20:03:12 JANUARY 30, 1999 

START STCK DATA COMPLETE DATA/LOG 

DATA LOG RBLP LRSN DATE 

----------------------------------------------------------------- 

BAAF725F60A7E106 BAAF7275EF9EF603 001C3D582090001C3D582090 2004/01/27 

TOKEN = E7F9F6C1BAAF725F60A7E106001C3D582090 

BAA928EADE2A7E26 BAA92904E3FE8D66 001C3A22B090 001C3A22B090 2004/01/22 

TOKEN = E7F9F6C1BAA928EADE2A7E26001C3A22B090 

COMPLETE 

LTIME LOCATION NAME 

---------------------- 

08:40:47 PRD 

08:40:17 PRD 


Restores DB2 system to specified point-in-time 

RESTORE SYSTEM or RESTORE SYSTEM LOGONLY 

Use for logical or for physical DR 

Needs to conditionally restart DB2 prior to 

running RESTORE SYSTEM 

–DSNJU003, CRESTART CREATE SYSPITR=logpoint 

INSTALL SYSADM authority required 

Handles CREATE, DROP and LOG NO events… 

…but some LOG NO operations not supported: 

LOAD LOG NO, REORG, CREATE INDEX 


DSNJU003: 

CRESTART CREATE SYSPITR=log-point 

SYSOUT: 

DSNU000I DSNUGUTC -OUTPUT START FOR UTILITY, UTILID = PRD.SRESTORE 

DSNU1044I DSNUGTIS -PROCESSING SYSIN AS EBCDIC 

DSNU050I DSNUGUTC -RESTORE SYSTEM 

DSNU1606I DSNUVBRD -RESTORE SYSTEM UTILITY STARTING, 


TOKEN = X'E7F9F6C1BAAF725F60A7E106001C3D582090'. 

DSNU1627I DSNUVBRD -RESTORE SYSTEM PRE-LOG APPLY COMPLETED 

SUCCESSFULLY, COPYPOOL = DSN$PRD$DB 

TOKEN = X'E7F9F6C1BAAF725F60A7E106001C3D582090' 

ELAPSED TIME = 00:00:15. 

... 

DSNU1604I -X96A DSNUVARL -RESTORE SYSTEM PHASE LOG APPLY STARTED AT LOG POINT = 

X’001C3D582090’ 

DSNU1629I -X96A DSNUVARL -DB2 PUT ONE OR MORE OBJECTS INTO THE RECOVER-PENDING 

STATE, THE REBUILD-PENDING STATE OR THE LOGICAL PAGE LIST 

DURING THE LOG APPLY PHASE. 

DSNU1628I DSNUVBRD -RESTORE SYSTEM PHASE LOG APPLY COMPLETED, ELAPSED TIME = 

00:01:42. 

DSNU010I DSNUGBAC -UTILITY EXECUTION COMPLETE, HIGHEST RETURN CODE=4 


Good news: sliding secondary allocation quantity 

size 

DB2 calculates the secondary extents size by using 

a sliding scale algorithm 

Applies to DB2 managed pagesets only 

Tries to avoid VSAM maximum extent limit errors 

Scenarios: 

No need for PRIQTY/SECQTY values 

Don’t know space requirements or are volatile 

Test environment: SET and FORGET 


Some advantages: 

It minimizes the potential for wasted space by increasing the 

size of secondary extents slowly at first 

It prevents very large allocations for the remaining extents, 

which would likely cause fragmentation 

It does not require users to specify SECQTY values when 

creating and altering table spaces and index spaces 

It is theoretically possible to always reach maximum data set 

size without running out of secondary extents 

WARNING: DB2 uses the value of the SECQTY option 

to allocate a secondary extent only if the value of the 

option is larger than the value that is derived from the 

sliding scale algorithm 


Default PRIQTY 

1 cylinder for non-LOB tablespaces and indexes 

10 cylinders for LOB tablespaces 

First 127 extents are allocated in increasing size, 

and the remaining extents are allocated based on 

the initial size of the data set: 

For 32 GB and 64 GB data sets, each extent is allocated 

with a size of 559 cylinders 

For data sets that range in size from less than 1 GB to 

16 GB, each extent is allocated with a size of 127 

cylinders 


16GB: 127 CYLs 

< 64GB: 559 CYLs 


INSTALL DB2 - SIZES PANEL 2 

===> 

Check numbers and reenter to change: 

1 USER LOB VALUE STORAGE ===> 10240 Max storage per user for LOB 

values in kilobytes 

2 SYSTEM LOB VALUE STORAGE ===> 2048 Max storage per system for LOB 

values in megabytes 

3 MAXIMUM LE TOKENS ===> 20 Maximum tokens at any time. 0-50 

4 TABLE SPACE ALLOCATION ===> 0 Default space allocation in KB for 

table spaces 

(0 for DB2 default or 1-4194304) 

5 INDEX SPACE ALLOCATION ===> 0 Default space allocation in KB for 

index spaces 

(0 for DB2 default or 1-4194304) 

6 VARY DS CONTROL INTERVAL ===> YES Optimize VSAM CONTROL INTERVAL to 

page size for data set allocation 

7 OPTIMIZE EXTENT SIZING ===> YES Use sliding secondary quantity 

for DB2-managed data sets 

 

 

 

Can be activated online 

Zparm MGEXTSZ=YES (default = NO) 

Existing pagesets: ALTER PRIQTY/SECQTY to -1 + REORG 


Is it working? 

------------------------------------------------------------------------- 

DPA1CAT.DSNDBC.DSN8D81A.DSN8SBIN.I0001.A001 

listcat ent(/) all NDBD.DSN8D81A.DSN8SBIN.I0001.A001 540 ? 8 33 

VOLUME 

***************************** End of Data Set list ********************** 

VOLSER------------PR23A3 PHYREC-SIZE---------8192 HI-A-RBA--------26542080 

EXTENT-NUMBER----------8 

DEVTYPE------X'3010200F' PHYRECS/TRK------------6 HI-U-RBA--------25804800 

EXTENT-TYPE--------X'40' 

VOLFLAG------------PRIME TRACKS/CA-------------15 

EXTENTS: 

LOW-CCHH-----X'03C80000' LOW-RBA----------------0 TRACKS----------------15 

HIGH-CCHH----X'03C8000E' HIGH-RBA----------737279 

LOW-CCHH-----X'04680000' LOW-RBA-----------737280 TRACKS----------------30 

HIGH-CCHH----X'0469000E' HIGH-RBA---------2211839 

LOW-CCHH-----X'046A0000' LOW-RBA----------2211840 TRACKS----------------45 

HIGH-CCHH----X'046C000E' HIGH-RBA---------4423679 

LOW-CCHH-----X'046D0000' LOW-RBA----------4423680 TRACKS----------------60 

HIGH-CCHH----X'0470000E' HIGH-RBA---------7372799 

LOW-CCHH-----X'04740000' LOW-RBA----------7372800 TRACKS----------------75 

HIGH-CCHH----X'0478000E' HIGH-RBA--------11059199 

LOW-CCHH-----X'04790000' LOW-RBA---------11059200 TRACKS----------------90 

HIGH-CCHH----X'047E000E' HIGH-RBA--------15482879 

LOW-CCHH-----X'0A280000' LOW-RBA---------15482880 TRACKS---------------105 

HIGH-CCHH----X'0A2E000E' HIGH-RBA--------20643839 

LOW-CCHH-----X'0A3F0000' LOW-RBA---------20643840 TRACKS---------------120 

© 2007 MConsulting - cristian@molaro.be 50 

HIGH-CCHH----X'0A46000E' HIGH-RBA--------26542079

Materialized Query Tables = MQTs 

Table containing materialized data derived from one 

or more source tables specified by a fullselect 

Similar to automatic summary tables 

Query rewrite for dynamic SQL 

Can be accessed directly by static and dynamic SQL 

System-maintained MQTs (default) are populated with 

REFRESH TABLE 

User-maintained MQTs can be populated by REFRESH 

TABLE, load, insert, update and delete 


Datawarehouse 

Need to improve performance of critical query 

Query: 

10 tables involved in a multiple join can be 

improved by the use of a MQT 

Validate the REFRESH needs for 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) 


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 


Original access path: 


MQT creation: 

CREATE TABLE MQT.TEST3 AS 

(SELECT DISTINCT(REP.REPID) REPRESENTATIVEID, REP_LOC.LOCATIONID LOCATIONID, 

REP_PROD.PRODUCTID PRODUCTID, CITY.NAME AS CITY, REP.STATUSID AS REP_STATUSID, 

REP_MT_CURR.DIRECTION AS REP_MT_CURR_DIRECTION, REP_LOC.COUNTRYID AS 

REP_LOC_COUNTRYID, REP_PROD.PRODUCTID AS REP_PROD_PRODUCTID, 

GEN_SERVICE.PRODUCTID AS GEN_SERVICE_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) ; 


A daily REFRESH TABLE process was scheduled 

Query rewrite: 

SELECT representativeId, 

locationId, 

productId 

FROM mqt.test3 

WHERE 

REP_STATUSID=1 AND 

REP_MT_CURR_DIRECTION IN (2,3) AND 

REP_LOC_COUNTRYID=32 AND 

REP_PROD_PRODUCTID=2 AND 

CITY LIKE 'CONCEI%O DO ARAGUAIA%' AND 

GEN_SERVICE_productid IN (102) 

GROUP BY representativeId, 

LOCATIONID, 

PRODUCTID 

HAVING count(*)=1 ORDER BY 1,2,3 


New access path: 



New in V8: 

Statistics Advisor 

List cached statements and explain from statement 

cache 

Detailed explain information (incomplete list): 

○ Qualified rows estimates 

○ Detailed index costing information 

○ Parallelism details 

○ Sort details 


RedBook SG24-7421 

Not fully activated in V8 

V8 NFM only 

Full support in V9 




zIIPs 

NOT PADDED Indexes 

Backwards Index Scanning 

Unlike Types are now Indexable 

Non-Uniform Distribution Statistics on Non-Indexed Columns 

Partitioning and clustering separated 

Parallel Sorting 

 

 

 

 

 

 

 

 

 

 

64-bit Exploitation 

Data Partitioned Secondary Indexes 

4096 Partitions 

2000 byte Keys 

Long Object Names 

2 MB SQL Statements 

225 Table Joins 

Multi-row FETCH and INSERT 

More log space 

Online schema change… 



Moving to V8 is good 

Take documentation seriously 

Planning is key in the migration process 

A lot of improvements and new features 

Plan to get value of the new V8 features 

Educate yourself and others 


Questions? 

cristian@molaro.be

DB2 for z/OS V8 - Guide Share France

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