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Figure 114 illustrates the relationship between the dictionary record, the field
connectors, and the performance records.
How the string of field connectors is constructed
When CICS is initialized, a unique connector value is assigned to every dictionary
entry. CICS then examines the MCT entries for this run to see if you have excluded
any system-defined performance data. If you have, the offset values for their
corresponding dictionary entries are set to X'FFFF'. CICS then constructs a
sequence of field connectors that excludes those with offsets of X'FFFF'. In this
way, the connectors tell you which system- and user-data fields are going to occur
in your performance records for this run. If you have not excluded any
system-defined performance data, there is one field connector for every dictionary
entry.
Note the difference between field connectors, field identifiers, and field offsets:
Field connectors
link the fields in a performance record with their dictionary entries. They are
unique values that are assigned at initialization time. They may, therefore,
change from one run of CICS to the next.
Field identifiers
allow you to exclude specific system-defined performance data from being
collected during a CICS run. They are unique within a group name and
Dictionary Record
Dictionary Dictionary Dictionary Dictionary Dictionary
Entry 1 Entry 2 Entry 3 Entry 4 Entry n
Field 001 002 004 nnn
Connectors
Performance Data for Data for Data for Data for
Record 1 field 1 field 2 field 4 field n
Performance Data for Data for Data for Data for
Record 2 field 1 field 2 field 4 field n
Performance Data for Data for Data for Data for
Record 3 field1 field2 field4 fieldn
Performance Data for Data for Data for Data for
Record 4 field 1 field 2 field 4 field n
Figure 114. Relationship between the dictionary record and the performance records. In this example, the data that is
defined by Dictionary Entry 3 has been excluded, so there is no field connector value for it and it does not appear in
the performance records.
Chapter 28. CICS monitoring 763