LOGPOLLINTERVAL

This keyword specifies how often CDC for Db2® for z/OS® polls the Db2 log for new changes to replicate.

seconds is an integer value between 1 and 600, inclusive. This is the time in seconds that must pass since Db2 reported that there was no additional data in the log before CDC Replication polls the Db2 log for data again.

INCREASE, if specified or defaulted, indicates that the value of seconds can be automatically increased. After 10 consecutive unsuccessful requests for Db2 log data, the number of seconds that is specified by the first parameter is increased by a factor of 10, and this new value is used for the log polling interval from that point forward, while more data is not available from Db2. When Db2 log data is retrieved, the specified value of seconds is restored and used again to begin the next log polling cycle. This method can help to reduce the number of unproductive log requests during low workload periods, saving CPU resources. On the other hand, it can cause short instances of higher latency, up to 10 times higher than the value of seconds, if the log polling cycle ends in one of the extended intervals of seconds multiplied by 10.

NOINCREASE causes the value of seconds to be used indefinitely for log polling cycles, without any adjustment. This setting might be preferable where an unmodified polling interval must be used, such as when working to a service level agreement.

This keyword is optional.

Default Setting—5, INCREASE

Minimum Setting—1 second

Maximum Setting—600 seconds