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Server for OS/390 Release 1. Each journal record in these logs, if presented in the
newer format, contains more information than in the equivalent journal record
presented in the CICS/ESA 4.1 format.
System logs are always presented in CICS Transaction Server for OS/390 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 55 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.
Block
header
CICS
Journal
record
CICS
Journal
record
Record
header
Caller
data
Log block Log block Log block Log block
Figure 55. Layout of a general log
journaling
Chapter 23. CICS logging and journaling 633