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From this document we can easily have the broad concept of AS/400 Server.
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AS400 Introduction
In AS400, AS stands for "Application System”.
It is multiuser, multitasking and very secure system and hence is used for the industry
which requires sensitive data to be stored and processed simultaneously.
It has integrated the DB2 database management system, menu-driven interfaces, multi-
user support, security, communications, client–server and web-based applications.
It is best suited for mid-level industry and hence is used in pharmaceutical industry,
banking, malls, hospital administration, manufacturing, distribution industry, financial
organization, e-commerce etc.
The AS/400 (Application System/400) was first introduced by IBM on June 21st, 1988
and later renamed to as eServer iSeries in 2000, then in 2006, it was renamed as System
i . In 2008 System i got unified with System p to become Power system.
The operating system for AS400 also got renamed with the rebranding. Initially, it
was OS/400 then i5/OSand then iBM i (Power system).
OS/400 Version 4, introduced a feature LPAR (Logical PARtitioning) which facilitates
running multiple operating systems simultaneously on one IBM System i unit ensuring that
one OS doesn’t interfere other’s system resources/memory.
Programming languages available for the AS/400 include RPG, assembly language, C, C+
+, Pascal, Java,Perl, Smalltalk, COBOL, SQL, BASIC, PHP, Python.
AS400 is based on Layered machine architecture. It enables user to move to new hardware
technology at any time, without disrupting their application programs.
It has Object orientation i.e. everything that can be stored or retrieved on the system is
known as an“objects”. AS400 can recognize only the object types that have been defined
for it. It cannot identify any unknown objects that don’t seem to be known. It adds extra
security to the system.
It provides contiguous memory between main storage and disk storage. It provides
authority to add any disk space so that use.
Another feature of AS400 is that it is very secure system making it to store sensitive data.
It incorporates security at various levels. Any user can be limited to access/process only
particular information on thesystem.
Library
When we execute a command or call a program, the AS/400 must know where to find
the command or program and the answer is library.
A Library is a collection of objects.
QSYS is the only library that contains other library.
A library contain the object name, type, and the address
QSYS is the root library where the entire user defined/ system defined library is created.
System library is the library that contains the objects that was created at the time OS400
was installed.
System supplied libraries begin with the letter "Q" or "#".
When you logon the first library to be load is QSYS. The system library is loaded at the
first time.
Library list types: System library: All IBM supplied library e.g. QSYS, QHLPSYS, QUSRSYS…
Product Library: Whenever Ibm product is used it is added to the library automatically
and is removed itself when the job completes.
Current Library: Current library is the working library i.e. all the work done by you is
stored in current library. If you want that all the things done by you should be stored in
your personal library ‘AMINEM’ , then just change the current library as your personal
library.
To change current library to your personal library AMINEM: CHGCURLIB AMINEM
User Library: Non-IBM supplied i.e. created by the user.
Related commands:
I. Display Library List (DSPLIBL)
To display all types of libraries, we can use the command:
In the below snapshot we can see different types of library in the library list
e.g. SYS(system), CUR(current), USR(user) library.
Display Library List
System: USALID09
Type options, press Enter.
5=Display objects in library
ASP
Opt Library Type Device Text
QSYS SYS System Library
QSYS2 SYS System Library for CPI's
QHLPSYS SYS
QUSRSYS SYS System Library for Users
AMINEM CUR
QGPL USR General Purpose Library
QTEMP USR
LOAD USR Future Three - LOAD Procedure & Update
More...
F3=Exit F12=Cancel F17=Top F18=Bottom
II. Create Library (CRTLIB)
To create library the command is: CRTLIB IROBO1 Press F4
Type choices, press Enter.
Library . . . . . . . . . . . . IROBO1 Name
Library type . . . . . . . . . . *TEST (*PROD, *TEST)
Text 'description' . . . . . . . THIS IS IROBO'S TEST LIBRARY
Bottom
F3=Exit F4=Prompt F5=Refresh F10=Additional parameters F12=Cancel
F13=How to use this display F24=More keys
Library type (TYPE)
*PROD
Database files in production libraries cannot be opened for updating if a user is in debug mode and
he requested that production libraries be protected.
A user can protect all database files in production libraries from
updates by specifying *NO for the Update production files (UPDPROD) parameter on the Start
Debug (STRDBG) command to begin testing. However, this protection does not prevent the program
from deleting database files or from changing other objects (such as data areas) in the library.
*TEST
This is a test library. All objects in a test library can be updated during testing, even if special
protection is requested for production libraries.
III. Display library (DSPLIB)
DSPLIB IROBO1
It gives you the information of all objects that resides in the library with its size.
Display Library
Library . . . . . . : IROBO1 Number of objects . : 8
Type . . . . . . . . : PROD Library ASP number . : 1
Create authority . . : *EXCLUDE Library ASP device . : *SYSBAS
Type options, press Enter.
5=Display full attributes 8=Display service attributes
Opt Object Type Attribute Size Text
PRINT1PGM *PGM RPGLE 131072 rpgle program for pri
ACCOUNT *FILE PF 49152 ACCOUNT RELATED INFOR
PRINT1 *FILE PRTF 4096 PRINTER DDS RLU GENER
QCLSRC *FILE PF 8192 Sources CL-Programs
QDDSSRC *FILE PF 8192 DDS-Sourcen
QRPGLESRC *FILE PF 69632
QRPGLESRC2 *FILE PF 65536
QRPGSRC *FILE PF 8192 SOURCE PHYSICAL FILE
Bottom
F3=Exit F12=Cancel F17=Top F18=Bottom
IV. Edit Library List (EDTLIBL)
You can add your personal library to any position just update the sequence no. “0” with the required where you want your library to be and the corresponding library name.
Edit Library List System: PUB1
Type new/changed information, press Enter. Sequence Sequence SequenceNumber Library Number Library Number Library 0 150 30010 GAMES400 160 31020 QGPL 170 32030 QTEMP 180 33040 190 34050 200 35060 210 36070 220 37080 230 38090 240 390
V. Add Library List Entry (ADDLIBLE) ADDLIBLE LIB(IROBO1) POSITION(*First)
It adds your personal library at the first position in the library list.
VI. Work With Libraries Using PDM (WRKLIBPDM)
Sourcephysical file
Source physical file is a filewhich contains the sources of different types of objects.
Command used is CRTSRCPF.CRTSRCPFFILE(IROBO1/QRPGSRC) RCDLEN(112) TEXT('SOURCE PHYSICAL FILE’)
There can be up to 32767 members.
Source physical file is anobject. But the source member is not an object. When we
compile the member, theobject is created for that source.
To see all thesource members of a source physical file, the command used is WRKMBRPDM. Work with MembersUsing PDM PUB1 File .. . . . . QRPGLESRC Library . . . . IROBO1 Position
to . . . . . Type options, press
Enter. 2=Edit 3=Copy 4=Delete 5=Display 6=Print 7=Rename 8=Display description 9=Save 13=Change text 14=Compile 15=Create
module... Opt Member Type Text ACCOUNT PF ACCOUNT RELATED INFORMATION PRINT1 PRTF PRINTER DDS RLU GENERATED PRINT1PGM RPGLE rpgle program for print1
Bottom Parameters or
command ===>
_______________________________________________________________________________________________________________________________________________________
_ F3=Exit F4=Prompt F5=Refresh F6=Create F9=Retrieve F10=Command entry F23=More options F24=More
keys
To add source ofany type of object in a source physical file we use the
command WRKMBRPDMand then F6.
Structure of the source physical file:
12 80 12
Serial no./Date Source of the member
Comment
If you want tocheck the structure do the runqry to check it:
RUNQRY QRYFILE ((QRPGLESRC *LAST))
Display
Report
Position to line . . . . . Shift to
column
Line ....
+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8....+....9....+...1
SRCSEQ SRCDAT SRCDTA
000001 1.00 121,019 FPRINT1 o E PRINTEROFLIND(*IN90)
000002 2.00 121,019 FACCOUNT IF E K
DISK
000003 3.00 121,019 C Z-ADD *ZEROS COUNT 2
0
000004 4.00 121,019 C WRITE HEADER1
000005 5.00 121,019 C WRITE HEADER2
000006 6.00 121,019 C READ REC1
80
000007 7.00 121,019 C DOW *IN80=*OFF
000008 8.00 121,019 C WRITE DETAIL
90
000009 9.00 121,019 C 90 WRITE HEADER2
000010 10.00 121,019 C EVAL COUNT=COUNT+1
000011 11.00 121,019 C READ REC1
80
000012 12.00 121,019 C ENDDO
000013 13.00 121,019 C EVAL TOTAL=COUNT
000014 14.00 121,019 C WRITE FOOTER
000015 15.00 121,019 C SETON LR
****** ******** End of
report ********
System defaultlength of Source physical file92
Recommendedlength of Source physical file112
**Note: If we are copying thesource code from one source file of length 112, we must assure that
the targetsource file must be of length 112, else the source code will be truncated.
Other than WRKMBRPDM, we can get the detail of Source physical fileby command DSPFD.
Related commands I. Display FileDescription (DSPFD) DSPFD IROBO1/QRPGLESRC
The command given information:
It is a source physical file in library IROBO1.
It’s creation date.
Detail of each and every member(ACCOUNT,PRINT1,PRINTPGM) as in abovesnapshot.
File Level Identifier: It is actually the timestamp that relate to creation date/time ofsource
file.
Member Level Identifier: It is actually the timestamp that relate to creation date/time
ofMembers.
File/Member Level Identifiers are used by operations such as
RSTOBJ tohelp avoid restoring files that are the wrong versions.
Record FormatLevel Identifiers: are hashes ofattributes of all of the fields in the format.
Attributes such as lengths andbuffer positions are hashed in order to generate a nearly
unique value.
A difference betweenFormat Level Identifiers in a program
and in a file will result in a "levelcheck" exception when the program attempts to open
the file.
Initial no. of records: Initially what is the no. of records(Here it is 10000)
Increment no. of record: Indicates, what should be the number of times the increment
willhappen.(Here it is 1000)
Maximum no. of increment: Indicates, what should be the increment factor by which
the record will increase.(Here it is 499)
Record capacity: Hence, on the basis of above three, themaximum no. of record could be
10000+499*1000=509000 i.e. given as recordcapacity below.
Current number of records: Current no.of record for each member.
No. of format=01
Total record length : 112
In the bottom summary of all members.
Display Spooled File
File .. . . . : QPDSPFD
Control . . . . .
Find .. . . . .
*...+....1....+....2....+....3....+....4....+....5....+....6....+....7....+.
12/31/12 Display File Description
DSPFD Command Input
File . . . . . . . . . . . . . . . . . . . : FILE QRPGLESRC
Library . . . . . . . . . . . . . . . . .: *LIBL
File Description Header
File . . . . . . . . . . . . . . . . . . . : FILE QRPGLESRC
Library . . . . . . . . . . . . . . . . . .: IROBO1
Type of file . . . . . . . . . . . . . . . : Physical
File type . . . . . . . . . . . . . . . . .: FILETYPE *SRC
Auxiliary storage pool ID . . . . . . . . .: 00001
Data Base File Attributes
Externally described file . . . . . . . . .: Yes
File level identifier . . . . . . . . . . .: 1121019191538
Creation date . . . . . . . . . . . . . . .: 10/19/12
Maximum members . . . . . . . . . . . . . .: MAXMBRS *NOMAX
Number of constraints . . . . . . . . . . .: 0
Number of triggers . . . . . . . . . . . . : 0
Number of members . . . . . . . . . . . . .: 3
Member size SIZE
Initial number of records . . . . . . . .: 10000
Increment number of records . . . . . . .: 1000
Maximum number of increments . . . . . . : 499
Record capacity . . . . . . . . . . . . . .: 509000
Coded character set identifier . . . . . . : CCSID 273
Initial number of records . . . . . . .: 10000
Increment number of records . . . . . .: 1000
Maximum number of increments . . . . . : 499
Current number of increments . . . . . . : 0
Record capacity . . . . . . . . . . . . .: 509000
Current number of records . . . . . . . .: 8
Number of deleted records . . . . . . . .: 0
Starting journal receiver for apply . . .:
Member . . . . . . . . . . . . . . . . . . : MBR PRINT1
Member level identifier . . . . . . . . .: 1121019191550
Member creation date . . . . . . . . . . : 10/19/12
Text 'description' . . . . . . . . . . . : TEXT PRINTER DDS RLU GENERATED
Expiration date for member . . . . . . . : EXPDATE *NONE
Member size SIZE
Initial number of records . . . . . . .: 10000
Increment number of records . . . . . .: 1000
Maximum number of increments . . . . . : 499
Current number of increments . . . . . . : 0
Record capacity . . . . . . . . . . . . .: 509000
Current number of records . . . . . . . .: 66
Number of deleted records . . . . . . . .: 0
Record Format List
Record Format Level
Format Fields Length Identifier
QRPGLESRC 3 112 2A4BA13FFF687
Text . . . . . . . . . . . . . . . . . . .:
Total number of formats . . . . . . . . . . : 1
Total number of fields . . . . . . . . . . .: 3
Total record length . . . . . . . . . . . . : 112
Member List
SourceCreation Last Change Deleted
Member Size Type Date Date Time Records Records
ACCOUNT 8192 PF 10/19/12 10/19/12 19:15:50 8 0
Text: ACCOUNT RELATED INFORMATION
PRINT1 16384 PRTF 10/19/12 10/19/12 19:17:53 66 0
Text: PRINTER DDS RLU GENERATED
PRINT1PGM 8192 RPGLE 10/19/12 10/19/12 19:15:50 15 0
Text: rpgle program for print1
Total number of members . . . . . . . . . : 3
Total number of members not available . . : 0
Total records . . . . . . . . . . . . . . : 89
Total deleted records . . . . . . . . . . : 0
Total of member
sizes . . . . . . . . . . : 32768
Note: The information can be filtered based on the TYPE
attribute: *MBR,*ACCPTH,*MBRLIST,*RCDFMT,*MBR.
DSPFD FILE(IROBO1/QRPGLESRC) TYPE(*MBRLIST)
Display Spooled
File
File . . . . .
: QPDSPFD
Control . .. .
.
Find . . . . .
.
*...
+....1....+....2....+....3....+....4....+....5....+....6....+....7....+....8....+.
12/31/12 DisplayFile
Description
DSPFDCommand
Input
File . . . . . . . . . . . . . .. . . . . :
FILE QRPGLESRC
Library . . . . . . . . . . . . . . . . .
: IROBO1
Type ofinformation . . . . . . . . . . . . :
TYPE *MBRLIST
Fileattributes . . . . . . . . . . . . . . :
FILEATR *ALL
System . . . . . . . . . . . . .. . . . . :
SYSTEM *LCL
FileDescription
Header
File . . . . . . . . . . . . . .. . . . . :
FILE QRPGLESRC
Library. . . . . . . . . . . . . . . . . .
: IROBO1
Type
offile . . . . . . . . . . . . . . .: Physical
Filetype . . . . . . . . . . . . . . . . . :
FILETYPE *SRC
Auxiliary storage pool
ID . . . . . . . . . : 00001
MemberList
SourceCreation Last
Change Deleted
Member Size Type Date Date Time Records Recor
ds
ACCOUNT 8192PF 10/19/12 10/19/12
19:15:50 8 0
Text: ACCOUNT
RELATEDINFORMATION
PRINT1 16384PRTF 10/19/12 10/19/12
19:17:53 66 0
Text: PRINTER DDS
RLUGENERATED
PRINT1PGM 8192RPGLE 10/19/12 10/19/12
19:15:50 15 0
Text: rpgle program
forprint1
Totalnumber of
members . . . . . . . . .: 3
Totalnumber of members not
available . .: 0
Totalrecords . . . . . . . . . . . . . .
: 89
Totaldeleted
records . . . . . . . . . .: 0
Total ofmember
sizes . . . . . . . . . . : 32768
Physical file It is a file which. Contains the data in predefined structured format.
It’s type PF. By using CRTPF command to create PF.
Maximum number of fields included in a PF is 8000.
Maximum no of key fields included is 120.
The structure of the PF is given below:
PHYSICAL FILE INTERNAL STRUCTURE
TYPE SPECIFIC ATTRIBUTE: Specific to its type
TYPE INDEPENDENT ATTRIBUTE: Creation date, author, size, expiration detail
KEYED ACCESS PATH: An area within a physical file obj where key field data is stored in the order along
with their RRN
Levels of entries in physical fileColumns . . .
: 1 71 Browse AMINEM/DDSSRCSEU==> A
CCOUNTFMT PF .....A..........T.Name++++++RLen++TDpB......Functions+++++++++++++
+++++*************** Beginning of data *****************************
0001.00 A UNIQUE >>>>> FILE LEVEL0002.00 A R ACCOUNT >>>>> RECORD
FORMAT LEVEL0003.00 A ACLEVELID 2P 00004.00 A ACORGCOD 3P 0 >>>>> FIELD LEVEL0005.00 A ACCOUNTNUM 12P 0
TYPE SPECIFIC ATTRITIBUTE
TYPE INDEPENDENT ATTRIBUTE
RECORD FORMAT
KEYED ACCESS PATH
RECORDS
0006.00 A ACCURRENCY 3A0007.00 A ACNAME 20A0009.00 A K ACLEVELID0010.00 A K ACORGCOD >>>>> KEYFIELD
LEVEL0011.00 A K ACCOUNTNUM0012.00 A K ACCURRENCY****************** End of data ********************************
I. File level entries (optional): File level entries give the system information of the
entire file. UNIQUE, LIFO, FIFO, FCFO, REF are the keywords used at file level.
UNIQUE: A record cannot be entered or copied into a file if its key value is same as the key value
of a record already existing in the file.
FIFO: The duplicate key records will retrieved in first in first out order.
LIFO: The duplicate key records will retrieved in last in first out order.
FCFO: The duplicate key records will retrieved in first changed first out order.
REF: This keyword is used to specify the name of the file from which the fields are taking
definition.
II. Record format level entries: For a PF the record format name is specified along
with an optional text description. The record level entries can be FORMAT, TEXT.
FORMAT:
This record-level keyword specifies that the record format being define is to share the field specifications of a previously defined record format. The name of the record format being defined must be the name of the previously defined record format.
The format of this keyword is:
FORMAT (LIB-NAME / FILE-NAME)
TEXT:
This record level keyword is used to supply a text description of the record format and it is used
for documentation purposes only.
The format of this keyword is:
TEXT (‘description’)
III. Field level entries: The field names and field lengths are specified along with and
optional text description for each field. (ALIAS, ALWNULL, CCSID, CHECK,
CHKMSGID, CMP, COLHDG, COMP, DATFMT, DATSEP, DFT, EDTCDE, EDTWRD,
REFFLD, REFSHIFT, TEXT, TIMEFMT, TIMESEP, VALUES, VARLEN)
IV. Key field level entries: The field names used as key fields are specified. (DESCEND,
SIGNED, ABSVAL, UNSIGNED, ZONE, NOALTSEQ, DIGIT)
File level keywords FIFO, LIFO, FCFO
FIFO: The duplicate key records will retrieved in first in first out order.
LIFO: The duplicate key records will retrieved in last in first out order.
FCFO: The duplicate key records will retrieved in first changed first out order.
When the FIFO, FCFO, or LIFO keyword is not specified, no guaranteed order is specified for
retrieving records with duplicate keys.
No specific order for duplicate key fields allows more access path sharing, which can improve
performance.
Arranging duplicate keys:
If you do not specify the Unique (UNIQUE) keyword in data description specifications (DDS),
you can specify how the system stores records with duplicate key values.
You specify that records with duplicate key values are stored in the access path in one of the
following ways:
Last-in-first-out (LIFO): When the LIFO keyword is specified, records with duplicate key
values are retrieved in LIFO order by the physical sequence of the records. Here is an example of
DDS using the LIFO keyword.
A LIFO A R REC2 A . A . A . A K EMPNO
Assume that a physical file has the FIFO keyword specified (records with duplicate keys are in
FIFO order), and that the following table shows the order in which records were added to the
file.
Order in which records were added to file
Key value
1 A
2 B
3 C
4 C
5 D
The sequence of the access path is FIFO, with ascending key values.
Records 3 and 4, which have duplicate key values, are in FIFO order. That is, because record 3
was added to the file before record 4, it is read before record 4.
This would become apparent if the records were read
in descending order. This can be done by creating a logical file based on this physical file, with
the DESCEND keyword specified in the logical file.
The sequence of the access path is FIFO, with descending key values.
Record number Key value access order
5 D
3 C
4 C
2 B
1 A
If the key value of physical record 1 is changed to C, the sequence of the access path for the
physical file is FIFO, with ascending key values.
Record number Key value access order
2 B
1 C
3 C
4 C
5 D
Finally, changing to descending order, the new sequence of the access path for the logical file is
FIFO, with descending key values.
Record number Key value access order
5 D
1 C
Record number Key value access order
3 C
4 C
2 B
After the change, record 1 does not appear after record 4, even though the contents of the key
field were updated after record 4 was added.
The FCFO order of records with duplicate key values is determined by the sequence of updates
made to the contents of the key fields. In the preceding example, after record 1 is changed such
that the key value is C, the sequence of the access path is FCFO, with ascending key values only.
Record number Key value access order
2 B
3 C
4 C
1 C
5 D
File level keywords REFUSE OF REFERENCE
Columns . . .
: 1 71 Browse AMINEM/DDSSRC
SEU==>
REFER
FMT PF .....A..........T.Name++++++RLen++TDpB......Functions+++++++++++++
+++++
*************** Beginning of data
*************************************
0002.00 A R REF
0003.00 A RAC1 2P 0 COLHDG('LEVEL ID')
0004.00 A RAC2 3P 0 COLHDG('ORG CODE')
0005.00 A RAC3 12P 0 COLHDG('ACCOUNT NUM')
0006.00 A RAC4 3A COLHDG('ACCOUNT
CURRENCY')
0007.00 A RPOSTCODE 2P 0 COLHDG('POST CODE')
0008.00 A RCOUNTRY 3P 0 COLHDG('COUNTRY
CODE')
0009.00 A RNAME 20A COLHDG('NAME')
0010.00 A RDATE 3P 0 COLHDG('DATE')
****************** End of data
****************************************
Now we can refer the file ‘REFER’ to take the field definition in the new file.
Columns . . . : 1 71 Browse AMINEM/DDSSRC
SEU==> USEREF
FMT PF .....A..........T.Name++++++RLen++TDpB......Functions+++++++++++++++++
+
*************** Beginning of data *************************************
0002.00 A REF(REFER)
0003.00 A R USEREF
0004.00 A ACCLVL R REFFLD(RAC1 REFER) >>>>>> field
name and
0005.00 ALIAS(ACC_LVL_ID) referred
file name
0007.00 A ACCORG R REFFLD(RAC2 REFER)
0008.00 ALIAS(ACC_ORG_CODE)
0009.00 A ACCNUM R REFFLD(RAC3 REFER)
0010.00 ALIAS(ACC_NUM)
0011.00 A ACCCUR R REFFLD(RAC4 REFER)
0012.00 ALIAS(ACC_CUR)
0013.00 A ACCNAME R REFFLD(RNAME REFER)
0014.00 ALIAS(ACC_NAME)
****************** End of data ****************************************
Both(COLHDG & ALIAS) are used to identify fields. COLHDG & ALIAS is the Description of fields. The
difference is that in ALIAS we can access data based on that ALIAS name, while COLHDG is not allowed.
Suppose in PF field name as DES78, give ALIAS as Description78, then user can access data from using
Description78.
Related Command
Create Physical File (CRTPF)
CRTPF FILE(AMITNEM/OBJ) SRCFILE(AMINEM/QDDSSRC) SRCMBR(OBJ_SRC)
The above command is similar to taking option-14 against the source member in member PDM(WRKMBRPDM).
If there is any data in the physical file and you are using CRTPF/option-14, then all the data in the physical file will be lost.
Change Physical File (CHGPF)
CHGPF FILE(AMITNEM/OBJ) SRCFILE(AMINEM/QDDSSRC) SRCMBR(OBJ_SRC)
If you don’t want to lose the data, but you want to compile the source member, then you can achieve this by CHGPF command.
We generally use CHGPF to change the attribute which are highlighted below.
Change Physical File
(CHGPF)
Type choices, press
Enter.
Physical
file . . . . . . . . . Name
Library . . . . . . . . . . . *LIBL Name, *LIBL,
*CURLIB
System . . . . . . . . . . . . . *LCL *LCL, *RMT,
*FILETYPE
Source file . . . . . . . . . . *NONE Name,
*NONE
Library . . . . . . . . . . . Name, *LIBL,
*CURLIB
Expiration date for member . . . *SAME Date, *SAME,
*NONE
Maximum members . . . . . . . . *SAME Number, *SAME,
*NOMAX
Access path size . . . . . . . . *SAME *SAME, *MAX4GB,
*MAX1TB
Access path maintenance . . . . *SAME *SAME, *IMMED, *REBLD,
*DLY
Access path recovery . . . . . . *SAME *SAME, *NO, *AFTIPL,
*IPL
Force keyed access path . . . . *SAME *SAME, *NO,
*YES
Member
size:
Initial number of records . . *SAME 1-2147483646, *NOMAX,
*SAME
Increment number of records . *SAME 0-32767,
*SAME
Maximum increments . . . . . . *SAME 0-32767,
*SAME
Maximum file wait time . . . . . 30 Number, *SAME, *IMMED,
*CLS
Maximum record wait time . . . . 60 Number, *SAME, *IMMED,
*NOMAX
Share open data path . . . . . . *SAME *SAME, *NO,
*YES
Max % deleted records allowed . *NONE 1-100, *NONE,
*SAME
Reuse deleted records . . . . . *YES *SAME, *YES,
*NO
Sort sequence . . . . . . . . . *HEX Name, *SAME, *SRC,
*JOB...
Bottom
F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this
display
F24=More
keys
Can LEVEL CHECK ERROR occur if we do CHGPF? It depends on the value that we have set for LVLCHK (Record format level check) attribute.
If its value is *YES then the record format level identifier is checked when the file is opened and if it doesn’t match it throws the error.
If its value is *NO, then the record format level identifier is not checked, hence no error.
CHGPFM
Change Physical File Member (CHGPFM)
Type choices, press
Enter.
Physical file . . . . . . . . . >
MASTER Name
Library . . . . . . . . . . . > AMINEM Name, *LIBL,
*CURLIB
Member . . . . . . . . . . . . . > *FIRST Name,
*FIRST
Source type . . . . . . . . . . *NONE Name, *SAME,
*NONE
Expiration date for member . . . *NONE Date, *SAME,
*NONE
Share open data path . . . . . . *NO *SAME, *YES,
*NO
Text 'description' . . . . . . . 'ACCOUNT RELATED
INFORMATION
'
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F3=Exit F4=Prompt F5=Refresh F12=Cancel F13=How to use this
display
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keys
Display file description(DSPFD)
It is used to display the details about the file.
Display file field description(DSPFFD) It is used for listing details about individual fields.
Reorganize physical file member(RGZPFM) We generally use RGZPFM to reuse the deleted records of a file for future insert operation.
The data in a file in inserted sequentially. If we delete some in between records, then
those freed spaces won’t be used for inserting new record. Like this, the toll of space
accumulated by deleted records goes on and we cannot use them until and unless we run
RGZPFM command to reorganize the space.
Once we delete the records the relative record number of the records gets changed due to
reorganization of file.
Suppose a file is used in most of the programs based on its key value. If we want to change
the access path of this file from sequential to keyed or from one key value to another key
value, then we can go for RGZPFM.
Example:
Below records are according to arrival sequence.
ACCOUNT ORG ACC CCY PARTY 000001 190 A00000000001 CCY P00000000001 000002 191 A00000000002 EUR P00000000002 000003 192 A00000000003 USD P00000000003 000004 192 A00000000004 TRY P00000000004 000005 190 A00000000005 INR P00000000005 000006 190 A00000000006 TRY P00000000006 000007 192 A00000000007 INR P00000000007 000008 191 A00000000008 GBP P00000000002 000009 191 A00000000009 USD P00000000001 000010 195 A00000000010 EUR P00000000003 000011 193 A00000000011 TRY P00000000005 000012 192 A00000000012 EUR P00000000002 000013 190 A00000000013 EUR P00000000009 000014 191 P00000000014 USD P00000000004 000015 192 A00000000015 INR P00000000010 000016 192 A00000000016 GBP P00000000011 000017 192 A00000000017 AZK P00000000017 000018 191 A00000000018 EUR P00000000014 000019 190 P00000000019 EUR P00000000015
Now we want to arrange the records according to the key value(ORG/ACC/CCY) of file
ACCOUNT. For this we set the KEYFILE = *FILE.
If we want to arrange the records based on some other key value then we can give the logical file
name containing that key value.
Reorganize Physical File Mbr (RGZPFM) Type choices, press Enter. Data base file . . . . . . . . . FILE > ACCOUNT
Library . . . . . . . . . . . > QGPL Member . . . . . . . . . . . . . MBR > ACCOUNT Key file: KEYFILE Logical file . . . . . . . . . > *FILE >>>>>>>>>>> Library . . . . . . . . . . Member . . . . . . . . . . . . Rebuild access paths . . . . . . RBDACCPTH *YES Allow cancel . . . . . . . . . . ALWCANCEL > *NO Additional Parameters Source update options . . . . . SRCOPT *SAME
After reorganizing, the records in ACCOUNT get arranged as per the key value of ACCOUNT. ORG ACC CCY PARTY 000001 190 A00000000001 CCY P00000000001000002 190 A00000000005 INR P00000000005000003 190 A00000000006 TRY P00000000006000004 190 A00000000013 EUR P00000000009000005 190 P00000000019 EUR P00000000015000006 191 A00000000002 EUR P00000000002000007 191 A00000000008 GBP P00000000002000008 191 A00000000009 USD P00000000001000009 191 A00000000018 EUR P00000000014000010 191 P00000000014 USD P00000000004000011 192 A00000000003 USD P00000000003000012 192 A00000000004 TRY P00000000004000013 192 A00000000007 INR P00000000007000014 192 A00000000012 EUR P00000000002000015 192 A00000000015 INR P00000000010000016 192 A00000000016 GBP P00000000011000017 192 A00000000017 AZK P00000000017000018 193 A00000000011 TRY P00000000005000019 195 A00000000010 EUR P00000000003