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I will detail here some notes made during OS/DB migration of a large SAP system.

I will be focusing on one key part – using a large PSAPTEMP tablespace vs using a smaller one (less h/w resources) and using unsorted exports for large tables.

I’m starting out with a viewpoint of going for a very large PSAPTEMP TS’ – especially if the resources for such are available and only temporarily needed.

However I also read that export times are longer – though index creation on the target take less time and data is better organised post import (giving better performance having essentially REORG’d the whole DB).

Also I will also be making some small reference to the export and import of our largest table. It doesn’t have the most rows – only 30 million (ish) – however it includes a BLOB field and itself takes up over 800 GB on it’s own. It has caused us difficulties in non-production migrations of this system – especially as the PL/SQL table splitter failed a few times until we changed the field we were splitting it on.

That’s it for now – I wanted to make a start so that I can continue this little diary later on……

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  1. Jamie Neilan Post author

    A couple of years down the line with no update. But I find that now my general policy is to increase PSAPTEMP as much as possible where disk space is available and then to sort as much as possible unless source hardware isn’t up to the task (i.e. if the target is a LOT more powerful run unsorted where you can).

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