Here's a brief steps for accomplishing a near zero downtime upgrade.
1) A golden client is built with ERP 6.0 built. SPAU/SPDD is done and is relaible
2) Table logging in turned on in the source release since that date.
3) The tools keeps flushing the delta between the two systems. Here the tool manages the strucure changes and others for standard SAP objects. For custom tables or any special add on's, you have to provide the list.
4) A 2 - 6 hour outage for the last delta to be flushed out.
But this is still in testing phase in SAP Labs.
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