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sangiah
New User
Joined: 10 Jun 2005
Posts: 62
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what are the possible RECFM ?
RECFM=FB
RECFM=VB |
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shinjini_t
New User
Joined: 11 May 2005
Posts: 14
Location: Bangalore, India
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RECFM=F/FB/V/VB/U/T are the various record formats.
U indicates that the records are undefined length.
V indicates that the records are variable length.
VS indicates that the records are variable length and spanned.
VBS indicates that the records are variable length, blocked, and spanned, and that the problem program must block and segment the records.
F indicates that the records are fixed length.
FB Indicates blocked fixed-length records.
T indicates that the records may be written using the track-overflow feature. |
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kanak
Moderator
Joined: 12 Mar 2005
Posts: 252
Location: India
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Possible Value for RECFM
| Code: |
RECFM
Value
------
F
FB
FBS
FBT
FBST
FS
FT
V
VB
VBS
VBT
VBST
VS
VT
U
UT |
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superk
Global Moderator
Joined: 26 Apr 2004
Posts: 4652
Location: Raleigh, NC, USA
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You forgot to mention:
FA
FBA
VA
VBA
FM
FBM
VM
VBM
where A is ANSI Print Control and M is Machine Print Control. |
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chakrimf
New User
Joined: 16 Jun 2005
Posts: 3
Location: bangalore
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F - Fixed
FB - Fixed Blocked
V - Variable
VB - Variable Blocked
FBA - Fixed Block with carriage control as first character
VBA - Variable Block with carriage control as first character
U - Undefined |
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i413678
Currently Banned
Active User
Joined: 19 Feb 2005
Posts: 112
Location: chennai
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Hi,
Normally U-undefined is used for load libraries.
pavan |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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can someone please tell me,
what is the relation between the LRECL and BLKSIZE
for various RECFM's discussed here..?
Thanks in advance. |
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swapnakotar
New User
Joined: 03 Oct 2007
Posts: 2
Location: bangalore
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| sudhakar_lendave wrote: |
can someone please tell me,
what is the relation between the LRECL and BLKSIZE
for various RECFM's discussed here..?
Thanks in advance. |
Hai,
all
LRECL is the logical record lengt it willbe 80 for fixed record length ,
BLKSIZE is the block size it will be the LRECL*100
THANKS,
swapna. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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Hello Swapna and welcome to the forums,
| Quote: |
| BLKSIZE is the block size it will be the LRECL*100 |
Not necessarily. For fixed lentgh records, BLKZISE should be a multiple of lrecl.
Once upon a time it was important to calculate an efficient block size so the least amojnt of dasd space would be wasted. These days the system will generate an effecisnt blocksize, so the jcl need not specify one. |
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murmohk1
Senior Member
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Joined: 29 Jun 2006
Posts: 1436
Location: Bangalore,India
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Swapna,
| Quote: |
| LRECL is the logical record lengt it willbe 80 for fixed record length , |
I want LRECL to be 32000 (say)..... how can I achive this?
| Quote: |
| BLKSIZE is the block size it eill be the LRECL*100 |
Why can't block size be in multiples of 30 (say). |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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Still i am searching for the answer..
Dick,
If system finds the eficient Blksize, then what is the meaning of
F(fixed length records).
FB (blocked fixed-length records.)
and FBA ....
so as for V, VB, VBA
in context of BLKSIZE?
Plz let me know if i am on wrong track! |
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khamarutheen
Active Member
Joined: 23 Aug 2005
Posts: 677
Location: NJ
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Hi,
I see a JCL with below DCB ... Is it mean that Blocksize is recognized by system??? If not if it is 0 then how does it work??
DCB=(RECFM=FB,LRECL=20,BLKSIZE=0)
I have thought in my training that if it is VB the we should mention the BLKSIZE where 4 bytes will be allocated if it is VB ..
Can any one clear me !!! |
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murmohk1
Senior Member
Joined: 29 Jun 2006
Posts: 1436
Location: Bangalore,India
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khamaurutheen,
| Quote: |
| Is it mean that Blocksize is recognized by system |
As Dick highlighted, System generates the efficient block size. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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Hello,
| Quote: |
then what is the meaning of
F(fixed length records).
FB (blocked fixed-length records.)
and FBA ....
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F would be fixed-length, unblocked. It is rarely used, but if specified, lrecl will equal blksize.
FB would be fixed-length, blocked. This puts multiple logical records in a physical block, greatly reducing input/output operations. When blocking records, a blksize should be used that wastes little space. As mentioned previously, the system will generate an efficient blksize.
FBA is basically the same ad FB except that printer control characters are in the first byte of each record.
The Vs asre similar. |
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sudhakar_lendave
New User
Joined: 21 Nov 2006
Posts: 48
Location: mumbai
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Thanks Dick.
That's what i was searching for. |
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dick scherrer
Moderator Emeritus
Joined: 23 Nov 2006
Posts: 19243
Location: Inside the Matrix
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You're welcome  |
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