Format Of General Log Block Header - IBM SC34-6814-04 Customization Manual

System logs are always presented in CICS Transaction Server for z/OS format..
Each general log comprises a stream of contiguous blocks of journaled data. Each
block comprises a block header followed by a variable number of CICS journal
records. Each CICS journal record comprises a record header followed by caller
data.
Figure 73 gives a graphical overview of a general log, showing the format of a
complete block, and the format of a complete journal record.
The format of the caller data depends on the CICS component that is issuing the
journal record, and also on the function being journaled at the time. Thus, for
example, the format of caller data in journal records issued by file control differs
from that of caller data in journal records issued by FEPI.
Log block
CICS
Block Journal
header record
Record Caller
header data
Figure 73. Layout of a general log

Format of general log block header

The log block header contains information of a general system-wide nature such as
the CICS applid writing the journal block. Figure 74 on page 714 shows the format
of the log block header.
Log block Log block
CICS
Journal
record
Log block
Chapter 27. CICS logging and journaling
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