AVEVA Global User Guide
Global Scheduler
: Schedule Set Up
Schedule Set Up
The Administrator needs to consider how and when items should be transferred. There are two types of commands that can be scheduled:
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Non-transfer makes sure that the remote location is updated to see all modifications.
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Transfer not only updates the remote location but also transfers the location where elements are to be modified.
As there are two directions (Master to Extract / Extract to Master) there are a total of four modes of transfer to consider when setting up schedules (these map to traditional extract functionality):
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Transfer to Child - (Extract Claim to the child extract)
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Transfer to Parent - (Extract Issue to Master)
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Non-Transfer to Child - (Extract Refresh to child extract)
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Non-Transfer to Parent - (Extract Flush to Master)
Schedule implementation would depend on the time zones but it is recommended that the Administrators set regular schedules for keeping the remote locations up to date with changes (non-transfer) for example every hour, and less regular item transfer schedules (for example once or twice a day).
To make the schedule process most efficient it is best to precede schedule commands with an update command. Although each of the commands include a database propagation operation running the update keeps the transfer process light.
An example of schedules for a location would be:
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Run Update every hour on the hour - 00:00
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Refresh child extracts at 10 minutes past the hour - 00:10
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Flush child extracts at 15 past the hour - 00:15
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Claim Data in the child twice a day, lunch time 12:30 and evening 19:00
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Issue Data twice a day, lunch time 13:00 and Evening 19:30
When locations reside in different time-zones the schedules need to be synchronised to allow for the shift in the time difference. In the example below there are three locations in Asia, Europe and the Americas. The diagram provides a possible set-up that makes sure data is shared between all locations regularly, with items location being transferred twice a day. The transfers try to follow the sun. The flow is to make sure that items are relocated on a half daily basis.
A Schedule can be created between 00:01 and 23:58 hours, from Monday to Sunday.
For example, a Non Transfer schedule which starts at 11 am from Monday to Sunday with an interval of 30 minutes, would always start at 11 am and would run till 23:30. For Scheduler, 00:01 is new day and hence it will run this schedule on 11 am the same day.
If the user wants to create a 24 hours working schedule, it is recommended that the user must create a Schedule starting at 00:10 running at given intervals from that start time from Monday to Sunday.
1974 to current year.
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