Understanding change accumulation sequencing
The first time a change accumulation batch job is run with the ONLY keyword specified for a change accumulation group, CICS® VR consolidates log records from the beginning of the specified log stream up to the time the job was submitted.
The next time the same change accumulation job is run, CICS VR consolidates log records from the time that the last change accumulation job stopped, up to the time the current job was submitted. The table Table 1 summarizes change accumulation sequencing for a sample CA group:
| Job run | First consolidated log record | Last consolidated log record |
|---|---|---|
| First run | First log record on the log stream | Last log record with a time stamp earlier than or equal to current job's submission time |
| All other runs | First log record with a time stamp later than previous job's submission time | Last log record with a time stamp earlier than or equal to current job's submission time |
Note: A date and time can be entered as a parameter of the BACKUPTIME
keyword in the SPHERE command. If BACKUPTIME is specified, CICS VR
uses the entered data and time when determining the first log record
to consolidate. Only log records that have a time stamp equal to or
later than the specified date and time are consolidated. A separate
BACKUPTIME keyword can be added for the ALL keyword and each NAME
keyword in the SPHERE command if desired.