Change of size and format, statistics, properties

See file statistics:

     jstat -v F.SAMPLE
      
     File C:\r11\bnk\bnk.run\F.SAMPLE
     Type=J4 , Hash method = 5
     Created at Tue Nov 20 19:38:25 2012
     Groups = 101 , Frame size = 4096 bytes , Secondary Record Size = 8192 bytes
     Restore re-size parameters : (none)
     File size = 417792 bytes , Inode = 29838 , Device = Id 24915
     Last Accessed Tue Nov 20 19:50:30 2012 , Last Modified Tue Nov 20 19:50:30 2012
     Backup = YES , Log = YES , Rollback = YES , Network = NO
     Record Count = 1 , Record Bytes = 45
     Bytes/Record = 45 , Bytes/Group = 0
     Primary file space:   Total Frames = 101 , Total Bytes = 45
     Secondary file space: Total Frames = 0 , Total Bytes = 0

NOTE

101 - number of groups - was defined when file was created.

Add more records:

     COPY FROM F.SAMPLE REC1,REC2
      
     1 records copied

Try to resize the file:

     jrf -V F.SAMPLE
      
     ...
     Downsizing skipped from modulo 101 to 3.

Resize it anyway:

     jrf -VD F.SAMPLE
      
     ...
     Downsizing from modulo 101 to 3

Change file type to JR:

     jrf -H6 F.SAMPLE

See statistics now:

     jstat -v F.SAMPLE
      
     File Type       = JR,        Hash method = 5, Created = Tue Nov 20 19:56:00 2012
     Frame size      = 4096,        OOG Threshold   = 2048
     File size       = 8192, Freespace       = 0 frames
     Internal Modulo = 3/7/11,      External Modulo = 13
     Inode no.       = 29838,       Device no.      = 24915
     Accessed        = Tue Nov 20 19:56:13 2012, Modified  = Tue Nov 20 19:56:13 2012
     Backup  = YES, Log      = YES, Rollback        = YES,  Secure updates  = NO
     Deallocate pointers : NO       Deallocate frames NO
     Revision level  = 2
     Record Bytes    = 82,   Record Count    = 2
     Bytes/Record    = 41,   Bytes/Group     = 82
     Data Frames     = 1,    Ptr Frames      = 0
     OOG Bytes       = 0,    OOG Frames      = 0
     Sum Squares     = 3362, Std Dev Mean    = 41

Turn on secure updates:

     jchmod +S F.SAMPLE

Check the result:

     jstat -v F.SAMPLE
      
     ...
     Backup  = YES, Log      = YES,  Rollback        = YES,  Secure updates  = YES
     ...

Delete a record:

     DELETE F.SAMPLE REC2
      
     1 record(s) deleted.

Add data sections:

     CREATE-FILE F.SAMPLE,TWO TYPE=JR
      
     [ 417 ] File F.SAMPLE]MTWO created , type = JR

     CREATE-FILE F.SAMPLE,THREE TYPE=JR
      
     [ 417 ] File F.SAMPLE]MTHREE created , type = JR

Create a record in a section:

     JED F.SAMPLE,TWO REC5
      
     0001 Section 2/1
     0002 Section 2/2
     0003 Section 2/3

See that all sections use the same dictionary:

     LIST F.SAMPLE,TWO
      
     F.SAMPLE,TWO..    ID..................    FIELD 1 HEADER
      
     REC5              REC5                    Section 2/1

     LIST F.SAMPLE,THREE
      
     F.SAMPLE,THREE    ID..................    FIELD 1 HEADER
      
      No Records Listed

NOTE

File F.SAMPLE still reports 1 record in it; here's the difference between having several data sections and a distributed file.