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A graphical overview of the format of a general log, showing the format of a
complete block, is shown in Figure 71.
Format of COMPAT41 journal control label header
Each log block starts with a journal control label header. There is one journal
control label header per log block. It is 42 bytes long, and comprises a length field,
label header, and label prefix. The format of the journal control label header is
shown in Figure 72.
The label header part of the journal control label header is 10 bytes long, and its
format is shown in Figure 73 on page 647.
Log block Log block Log block
Journal
control
label
header
Journal
record
1
Journal
record
2
Journal
record
nn
Log block
Figure 71. Format of general log formatted using the COMPAT41 option
32
Fixed length
Label prefixLabel header
104
Length of block
Not presented unless the
caller is reading data blocks
rather than records
Figure 72. Format of journal control label header
journaling
646
CICS TS for OS/390: CICS Customization Guide