Effect of SAP R/3 upgrade on Delta Queue

Hi Gurus,
We have our SAP upgrade scheduled to go-live in some time. My problem is that we have 2 loads based on Direct Delta queue concept.
As per my understanding, the approach that we need to follow is that we should get all the users locked and then load the data into BW system from delta queue. Once this is done and the delta queue is cleared, we can bring the R/3 system down for upgrade.
The approach adopted for Upgrade is Downtime minimised, wherein for most part of upgrade, system will be down and for some part of upgrade the production will be up and running. In such a scenario where system will be up and upgrade will be running simultaneously, will there be any impact on the delta queues or rather shall I say that 'Will the delta queues affect upgrade process'

Hey. In my experience, you never want the system to be "up" during an upgrade. You will, or have, probably run accross the problem in dev or QC with doing the upgrade while the delta queues are populated. You will often get an error message that queues still have data to be transfered.
So I guess the simplest answer is that you do run the risk of having problems with the upgrade. If thre is no choice but to do the upgrade partially doing productive hours, I would just clear all the queues and hope for the best. Not a great answer, but not sure what the best answer would be in your scenario.
Thanks

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Delta queues during support package upgrade
Its always better to drain the delta queues before an upgrade.
As a standard practice we drain the delta queues by running the IP/ chain multiple times.
As a prerequiste we cancel/reschedule the V3 jobs to a future date during this activity.
The V3 extraction delta queues must be emptied prior to the upgrade to avoid any possible data loss.
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https://www.sdn.sap.com/irj/sdn/go/portal/prtroot/docs/library/uuid/472443f2-0c01-0010-20ab-fbd380d45881
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OSS notes 328181 and 762951 as a prerequisites.
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https://websmp207.sap-ag.de/~form/sapnet?_FRAME=CONTAINER&_OBJECT=011000358700002662832005E
/thread/804820
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Effect of SAP R/3 upgrade on Delta Queue

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