Example 2 — Unloading columns in clustering order


This example unloads from the same partitioned table space that was used in example 1 but unloads the data in clustering order.

This job achieves optimum performance through multitasking.

The SYSPRINT shows the following information:

  • Message BMC51701I reports that four tasks can run concurrently and that each task can use up to 32 sort work data sets.
  • UNLOAD PLUS generates Db2 LOAD control cards by default (because the job does not include a CNTLCARDS option, but the JCL includes an SYSCNTL DD statement).
  • Message 50041I indicates the status of zIIP processing. For this example, the ZIIP installation option is ENABLED, but an SUF (also known as XBM) subsystem was not specified. UNLOAD PLUS automatically located an available SUF (also known as XBM) subsystem to provide zIIP processing.

The following table describes the key command options for this job:

Command options used in JCL

Description

ORDER YES

Sorts output records in data-sorting key sequence

LIMIT 2

Unloads two records from each partition

FIXEDVARCHAR YES

Tells UNLOAD PLUS to convert output records that would normally be variable-length to fixed length by padding variable-length columns with spaces

SELECT

Specifies columns to unload and the order in which to unload them

INTO

Specifies names and characteristics of output fields

IF NULL VALUE ('xx')

Eliminates NULL indicator fields and replaces nulls with the value that you specify

FROM

Names the table to unload

The following figure shows the JCL for example 2:

//    JOBCARD
//********************** ADUEX02 **************************************
//*********************************************************************
//******        Unloading columns in clustering order        **********
//*********************************************************************
//*  Replace "DB2SYS" by your DB2 subsystem name.                     *
//*  Use your DB2 product install libraries for STEPLIBS :            *
//*     PRODUCT.LIBRARIES                                             *
//*     DB2.DSNEXIT                                                   *
//*     DB2.DSNLOAD                                                   *
//*********************************************************************
//UNLOAD02 EXEC PGM=ADUUMAIN,REGION=0M,
//         PARM=(DB2SYS,'ADUEX02','NEW ',,'MSGLEVEL(1)')
//*********************************************************************
//STEPLIB  DD DISP=SHR,DSN=PRODUCT.LIBRARIES
//         DD DSN=DB2.DSNEXIT,DISP=SHR
//         DD DSN=DB2.DSNLOAD,DISP=SHR
//*
//SYSIN    DD   *
*
 UNLOAD
        ORDER YES
        SORTNUM 2
        LIMIT 2
        FIXEDVARCHAR YES
        SELECT DEPT_NO,
               EMPL_LNAME,
               SSN,
               HIRE_DATE,
               JOB_CODE,
               SALARY_HRLY,
               PART_401K
        INTO
                 ,
                 ,
                 ,
               HIRE_DATE IF NULL VALUE('01/01/1991'),
               JOB_CODE CHARACTER(2) IF NULL VALUE(' '),
               SALARY_HRLY DECIMAL EXTERNAL(9,2) IF NULL VALUE(999.99),
               PART_401K
                 IF PART_401K ='0' VALUE('N')
                 IF PART_401K ='1' VALUE('Y')
                 IF PART_401K = NULL VALUE ('N')
        FROM BMC.EMPLS
*
//SYSREC   DD   DSN=ADU.EXAMPL02.SYSREC,
//         DISP=(,CATLG),SPACE=(TRK,(1,1)),UNIT=SYSDA
//SYSCNTL  DD   DSN=ADU.EXAMPL02.SYSCNTL,
//         DISP=(,CATLG),SPACE=(TRK,(1,1)),UNIT=SYSDA
//SYSPRINT DD   DSN=ADU.EXAMPL02.SYSPRINT,
//         DISP=(,CATLG),SPACE=(TRK,(1,1)),UNIT=SYSDA

The following table shows the records that the job stream in example 2 produced. UNLOAD PLUS sorts output records by the clustering key, DEPT_NO. The numbers given for POS indicate the start and end positions for each field.

Although UNLOAD PLUS unloads the same table as in example 1, this output does not include NULL indicator fields because the UNLOAD command includes IF NULL clauses for all nullable fields. Also, because FIXEDVARCHAR YES is specified, EMPL_LNAME in the output is a VARCHAR field with a length indicator, but the character part of the field is always 20 bytes long. UNLOAD PLUS pads the character part of this field with blanks.

Record type

Record 1

Record 2

Record 3

Record 4

Record 5

Record 6

Record 7

Record 8

DEPT_NO POS(1,4)

1100

1300

3200

3300

5100

5100

8200

8200

EMPL_LNAME POS(5,*)

Johnson

Broderick

Bronson

Doe

Williamson

George

Kennedy

Wilson

SSN POS(22,30)

490287572

387628543

837625104

463762574

828382664

182864652

583872386

283846563

HIRE_DATE POS(31,40)

01/16/1993

08/23/1992

03/05/1990

01/01/1991

04/03/1992

05/19/1989

03/31/1993

04/25/1992

JOB_CODE POS(41,42)

13

13

44

84

13

24

82

84

SALARY_HRLY POS(43,51)

9.00

44000.00

6.25

32000.00

5.75

7.50

36000.00

45000.00

PART_401K POS(52,52)

N

Y

N

Y

Y

N

Y

N

SYSPRINT for example 2

The following figure shows the SYSPRINT for example 2:

1                               *****  B M C   U N L O A D   P L U S   F O R   D B 2    V13R1.00 *****
                                             (C) COPYRIGHT 1991 - 2022 BMC SOFTWARE, INC.
-BMC50001I UTILITY EXECUTION STARTING    1/25/2022    8:12:27 ...
 BMC50002I UTILITY ID = 'ADUXM02'.  DB2 SUBSYSTEM ID = 'DEMO'.  OPTION MODULE = 'ADU$OPTS'.
 BMC50471I z/OS 2.4.0,PID=HBB77C0,DFSMS FOR Z/OS=2.4.0,DB2=13.1.501
 BMC50471I REGION=0M,BELOW 16M=8.6M,ABOVE 16M=1,004.3M,IEFUSI=NO,CPUs=7,GPs=5,zIIPs=2
 BMC50471I MEMLIMIT=15.9E,AVAILABLE=15.9E,MEMLIMIT SET BY:REGION=0
 BMC50471I SMFID=DB2B,JOBID=J0940357,JOB=ADUEX02,STEP=UNLOAD02,CPU=8561-615 (z15)/1.71,72.0G
0
 BMC50471I UNLOAD PLUS FOR DB2--V13.01.00 BASE
 BMC50471I   NO MAINTENANCE TO REPORT
 BMC50471I DB2 UTILITIES COMMON CODE--V13.01.00 BASE
 BMC50471I   NO MAINTENANCE TO REPORT
 BMC50471I SOLUTION COMMON CODE--V13.01.00 BASE
 BMC50471I   MAINT: BPJ1541  BPJ1713  BPJ2211
 BMC50471I BMCSORT ENGINE--V02.04.01
 BMC50471I   MAINT: BPJ0691  BPJ0718  BPJ0881  BPJ0922  BPJ0996  BPJ1164  BPJ1309  BPJ1386  BPJ1497  BPJ1594  BPJ1724  BPJ1809
 BMC50471I          BPJ1833  BPJ1891  BPJ1905  BPJ2109  BPJ2232  BPJ2297
 BMC50471I BMC STATS API--V13.01.00 BASE
 BMC50471I   NO MAINTENANCE TO REPORT
 BMC50471I EXTENDED BUFFER MANAGER--V06.02.01
 BMC50471I   MAINT: BPE0443  BPE0445  BPE0447  BPE0449  BPE0450  BPE0451  BPE0452  BPE0455  BPE0456  BPE0457  BPE0460  BPE0463
 BMC50471I          BPE0467  BPE0468  BPE0469  BPE0473  BPE0474  BPE0475  BPE0479  BPE0480  BPE0482  BPE0487  BPE0488  BPE0489
 BMC50471I          BPE0493  BPE0497  BPE0498  BPE0501  BPE0503  BPE0507  BPE0512  BPE0513  BPE0517  BPE0518  BPE0519  BPE0523
 BMC50471I          BPE0524  BPE0527  BPE0528  BPE0530  BPE0531  BPE0534  BPE0535  BPE0540  BPE0541  BPE0542  BPE0545  BPE0549
 BMC50471I          BPE0551  BPE0552  BPE0555  BPE0557  BPE0560
0
 BMC50471I ANALYZE=(DB2STATS,NOLIMIT)              FORCE=NONE                              SORTNUM=32
 BMC50471I CENTURY=(1950,2049)                     HISTORY=YES                             SQLDELAY=3
 BMC50471I CHANGE_CONSISTENT=NO                    IBUFFS=25                               SQLRETRY=100
 BMC50471I CHANGE_QUIESCE=NO                       INLINE=NO                               SSREPORT=REPORT_SWITCH
 BMC50471I CMAX=16                                 LOADDECP=NO                             TAPEDISP=DELETE
 BMC50471I CMRATIO=50                              LOCKROW=YES                             TASKMAX=200%
 BMC50471I CONSTRULES=BMC                          MAXP=5                                  UBUFFS=25
 BMC50471I CURRENTDEGREE=NONE                      MSGLEVEL=1                              UNLDMAX=200%
 BMC50471I DELFILES=NO                             NULLCHAR=X'6F'                          UNLOADDN_ACTIVE=(NO,NO)
 BMC50471I DRNDELAY=3                              NULLTYPE=T1                             UNLOADDN=(SYSREC,SYSRED)
 BMC50471I DRNRETRY=10                             OPNDB2ID=YES                            USELRECL=NO
 BMC50471I DRNWAIT=UTIL                            PLAN=ADU1310T                           UXSTATE=SUP
 BMC50471I DSPLOCKS=NONE                           RECFM=AUTO                              WORKUNIT=SYSALLDA
 BMC50471I EXCLDUMP=(X37,X22,X06)                  ROWSETSZ=100                            XBMID=XBMDB2V
 BMC50471I FILEREFDN=SYSREF                        SDUMP=YES                               ZIIP=ENABLED
 BMC50471I FILL=NO                                 SHRLEVEL=REFERENCE                      ZONEDDECOVP=(C,D)
 BMC50471I FORCE_AT=(START,3)                      SMAX=16
 BMC50471I FORCE_RPT=NO                            SMCORE=(0K,0K)
0
0
 BMC50471I TAPES=NONE
0
 BMC50470I OUTPUT   = SYSREC                             SYSRED                               SYSREF
 BMC50470I UNIT     = SYSALLDA                           SYSALLDA                             SYSALLDA
 BMC50470I VOLCNT   = 25                                 25                                   25
 BMC50470I GDGLIMIT = 5                                  5                                    5
 BMC50470I GDGEMPTY = NO                                 NO                                   NO
 BMC50470I GDGSCRAT = NO                                 NO                                   NO
 BMC50470I STORCLAS = NONE                               NONE                                 NONE
 BMC50470I DATACLAS = NONE                               NONE                                 NONE
 BMC50470I MGMTCLAS = NONE                               NONE                                 NONE
 BMC50470I UNITCNT  = 0                                  0                                    0
 BMC50470I SPACE    = CYL                                CYL                                  CYL
 BMC50470I PCTPRIM  = AUTO                               AUTO                                 AUTO
 BMC50470I MAXPRIM  = 0                                  0                                    0
 BMC50470I MAXSECD  = 0                                  0                                    0
 BMC50470I FILESZPCT  100                                100                                  100
 BMC50470I NBRSECD  = AUTO                               AUTO                                 AUTO
 BMC50470I DISKRETN = NONE                               NONE                                 NONE
 BMC50470I DISKEXPD = NONE                               NONE                                 NONE
 BMC50470I RETPD    = NONE                               NONE                                 NONE
 BMC50470I EXPDT    = 99000                              99000                                99000
 BMC50470I TRTCH    = NONE                               NONE                                 NONE
 BMC50470I DSNTYPE  = NONE                               NONE                                 PDS
 BMC50483I SYSREC     VOLUMES=NONE
 BMC50483I SYSRED     VOLUMES=NONE
 BMC50483I SYSREF     VOLUMES=NONE
0
 BMC50483I SYSREC     DSNAME=&USERID.&TYPE.S&SELNUM
 BMC50483I SYSRED     DSNAME=&USERID.&TYPE.S&SELNUM
 BMC50483I SYSREF     DSNAME=&USERID.&TYPE.S&SELNUM.P&POSNUM
0

 BMC50471I DB2 DSNHDECP MODULE SETTINGS:
 BMC50471I VERSION                 = 1310
 BMC50471I SUBSYSTEM DEFAULT       = DEMO
 BMC50471I CHARACTER SET           = ALPHANUM
 BMC50471I DATE FORMAT             = USA
 BMC50471I TIME FORMAT             = USA
 BMC50471I LOCAL DATE LENGTH       = 0
 BMC50471I LOCAL TIME LENGTH       = 0
 BMC50471I DECIMAL POINT           = PERIOD
 BMC50471I DECIMAL ARITHMETIC      = 15
 BMC50471I DELIMITER               = DEFAULT
 BMC50471I SQL DELIMITER           = DEFAULT
 BMC50471I ENCODING SCHEME         = EBCDIC
 BMC50471I APPL. ENCODING SCHEME   = EBCDIC
 BMC50471I MIXED                   = NO
 BMC50471I EBCDIC CCSID            = (37,65534,65534)
 BMC50471I ASCII CCSID             = (819,65534,65534)
 BMC50471I UNICODE CCSID           = (367,1208,1200)
 BMC50471I IMPLICIT TIME ZONE      = CURRENT (-06:00)


 BMC50658I DB2 CURRENT FUNCTION LEVEL IS V13R1M501
 BMC50659I DB2 CATALOG LEVEL IS V13R1M501
 BMC50660I DB2 HIGHEST ACTIVATED FUNCTION LEVEL IS V13R1M501
 BMC50661I DB2 CODE LEVEL IS V13R1M501

 BMC50471I BMC_BMCUTIL       ='BMCUTIL.CMN_BMCUTIL'
 BMC50471I BMC_BMCSYNC       ='BMCUTIL.CMN_BMCSYNC'
 BMC50471I BMC_BMCHIST       ='BMCUTIL.CMN_BMCHIST'
 BMC50471I BMC_BMCXCOPY      ='BMCUTIL.CMN_BMCXCOPY'
 BMC50471I BMC_BMCSMARTSWITCH='BMCUTIL.CMN_BMCSWITCH'
 BMC50471I BMC_BMCSSTRACKING ='BMCUTIL.CMN_BMCSSTRACK'
0
0
 BMC50102I *
 BMC50102I  UNLOAD
 BMC50102I         ORDER YES
 BMC50102I         SORTNUM 2
 BMC50102I         LIMIT 2
 BMC50102I         FIXEDVARCHAR YES
 BMC50102I         SELECT DEPT_NO,
 BMC50102I                EMPL_LNAME,
 BMC50102I                SSN,
 BMC50102I                HIRE_DATE,
 BMC50102I                JOB_CODE,
 BMC50102I                SALARY_HRLY,
 BMC50102I                PART_401K
 BMC50102I         INTO
 BMC50102I                  ,
 BMC50102I                  ,
 BMC50102I                  ,
 BMC50102I                HIRE_DATE IF NULL VALUE('01/01/1991'),
 BMC50102I                JOB_CODE CHARACTER(2) IF NULL VALUE(' '),
 BMC50102I                SALARY_HRLY DECIMAL EXTERNAL(9,2) IF NULL VALUE(999.99),
 BMC50102I                PART_401K
 BMC50102I                  IF PART_401K ='0' VALUE('N')
 BMC50102I                  IF PART_401K ='1' VALUE('Y')
 BMC50102I                  IF PART_401K = NULL VALUE ('N')
 BMC50102I         FROM BMC.EMPLS
 BMC50102I *

 BMC51654I DIRECT YES IN EFFECT

 BMC51687I ESTIMATED ROWS FOR TABLE SPACE BMCEXDB.BMCEXATS PART 1 IS 110 FROM HURBA
 BMC51687I ESTIMATED ROWS FOR TABLE SPACE BMCEXDB.BMCEXATS PART 2 IS 110 FROM HURBA
 BMC51687I ESTIMATED ROWS FOR TABLE SPACE BMCEXDB.BMCEXATS PART 3 IS 110 FROM HURBA
 BMC51687I ESTIMATED ROWS FOR TABLE SPACE BMCEXDB.BMCEXATS PART 4 IS 110 FROM HURBA
 BMC51688I ESTIMATED ROWS FOR TABLE     BMC.EMPLS IS 440 FROM TABLESPACE
 BMC50004I UTILINIT PHASE COMPLETE.  ELAPSED TIME = 00:00:00


 BMC54000I SMARTSWITCH NOT SUPPORTED - NO BMC AMI UTILITIES VERSION FOUND
 BMC54003I SMARTSWITCH RULE: FORCE_NO_SWITCH  COMMENT: SMARTSWITCH NOT ACTIVATED, TABLE/ALIAS DOES NOT EXIST

 BMC50199I UNLOAD PLUS PROCESSING CONTINUES

 BMC51689I ESTIMATED ROWS FOR SELECT 1 IS 8

 BMC51639I FOR DDNAME 'SYSREC' DSN=ADU.EXAMPLE2.SYSREC,DCB=(RECFM=FB,BLKSIZE=27984,LRECL=53)
 BMC50394I UNABLE TO LOCATE SORT WORK DATASETS, DDNAME = 'SORTWKNN'

 BMC50894I PAGE EXTERNALIZATION PROCESS STARTING AT   1/25/2022   8:12:28
 BMC50651I SPACE BMCEXDB.BMCEXATS PART(0) PSID(0002)

 BMC50895I PAGE EXTERNALIZATION PROCESS COMPLETE.  ELAPSED TIME =  00:00:00

 BMC50877I POINT OF CONSISTENCY ESTABLISHED AT RBA/LRSN = 0000000003C2F5A7C500

 BMC50041I 0: ZIIP  ENABLED (0) USING XBM SUBSYSTEM XV2B
 BMC50474I BELOW 16M = 8332K, ABOVE 16M = 1017864K, CPUS = 5
 BMC51701I MAX TASKS = 4, MAX PARTITIONS PER TASK = 1, SORTWKS PER TASK = 2, MAX OPEN PARTITIONS PER TASK = 1
 BMC51680I UNLOAD LIMIT OF 2 REACHED FOR PARTITION 3
 BMC50477I 3: PARTITION =    3, ROWS/KEYS = 2, I/O WAITS = 2 ,DDNAME = SYS00008
 BMC51680I UNLOAD LIMIT OF 2 REACHED FOR PARTITION 4
 BMC50477I 4: PARTITION =    4, ROWS/KEYS = 2, I/O WAITS = 2 ,DDNAME = SYS00010
 BMC51680I UNLOAD LIMIT OF 2 REACHED FOR PARTITION 2
 BMC50477I 2: PARTITION =    2, ROWS/KEYS = 2, I/O WAITS = 2 ,DDNAME = SYS00009
 BMC51680I UNLOAD LIMIT OF 2 REACHED FOR PARTITION 1
 BMC50477I 1: PARTITION =    1, ROWS/KEYS = 2, I/O WAITS = 2 ,DDNAME = SYS00007
 BMC50478I 1: RDB LOCK WAITS = 0
 BMC50478I 2: RDB LOCK WAITS = 0
 BMC50478I 3: RDB LOCK WAITS = 0
 BMC50478I 4: RDB LOCK WAITS = 0
 BMC50476I DDNAME = SYSREC, I/OS = 4, I/O WAITS = 4, RDB LOCK WAITS = 0
 BMC51671I UNLOAD STATISTICS:  2 ROWS PROCESSED FROM PARTITION 1
 BMC51686I UNLOADING OF DATASET 'DEMOCAT.DSNDBD.BMCEXDB.BMCEXATS.I0001.A001' READ 4 PAGES
 BMC51671I UNLOAD STATISTICS:  2 ROWS PROCESSED FROM PARTITION 2
 BMC51686I UNLOADING OF DATASET 'DEMOCAT.DSNDBD.BMCEXDB.BMCEXATS.I0001.A002' READ 4 PAGES
 BMC51671I UNLOAD STATISTICS:  2 ROWS PROCESSED FROM PARTITION 3
 BMC51686I UNLOADING OF DATASET 'DEMOCAT.DSNDBD.BMCEXDB.BMCEXATS.I0001.A003' READ 4 PAGES
 BMC51671I UNLOAD STATISTICS:  2 ROWS PROCESSED FROM PARTITION 4
 BMC51686I UNLOADING OF DATASET 'DEMOCAT.DSNDBD.BMCEXDB.BMCEXATS.I0001.A004' READ 4 PAGES
 BMC51672I UNLOAD STATISTICS:  8 ROWS PROCESSED FROM SPACE 'BMCEXDB.BMCEXATS', 0 NOT SELECTED, 0 DISCARDED
 BMC51674I UNLOAD STATISTICS:  8 RECORDS WRITTEN TO DDNAME 'SYSREC'
 BMC51675I UNLOAD STATISTICS:  0 RECORDS DISCARDED DUE TO ERRORS
 BMC50041I 0: ZIIP NOT ENABLED (0) USING XBM SUBSYSTEM XV2B
 BMC50004I UNLOAD PHASE COMPLETE.  ELAPSED TIME = 00:00:04


 BMC51639I FOR DDNAME 'SYSCNTL' DSN=ADU.EXAMPLE2.SYSCNTL,DCB=(RECFM=FB,BLKSIZE=3120,LRECL=80)
 BMC51801I LOAD TABLE STATEMENTS WRITTEN TO DDNAME 'SYSCNTL'
0
 BMC51810I LOAD DATA INDDN SYSREC
 BMC51940I      EBCDIC CCSID(37,65534,65534)
 BMC51811I   INTO TABLE
 BMC51809I BMC.EMPLS
 BMC51815I (DEPT_NO POSITION(1:4) CHAR  (4)
 BMC51813I ,EMPL_LNAME POSITION(5:*) VARCHAR
 BMC51815I ,SSN POSITION(22:30) CHAR  (9)
 BMC51815I ,HIRE_DATE POSITION(31:40) DATE  EXTERNAL(10)
 BMC51815I ,JOB_CODE POSITION(41:42) CHAR  (2)
 BMC51816I ,SALARY_HRLY POSITION(43:51) DECIMAL EXTERNAL(9,2)
 BMC51815I ,PART_401K POSITION(52:52) CHAR  (1)
 BMC51814I       NULLIF BMC_NULL1=X'6F'
 BMC51819I     ,     BMC_NULL1 POSITION(53) CHAR(1)
 BMC51809I )
0
 BMC50476I DDNAME = SYSCNTL, I/OS = 1, I/O WAITS = 1, RDB LOCK WAITS = 0
0BMC50006I UTILITY EXECUTION COMPLETE, RETURN CODE = 0

 

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