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IBM Data and AI Ideas Portal for Customers


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We invite you to shape the future of IBM, including product roadmaps, by submitting ideas that matter to you the most. Here's how it works:

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Status Not under consideration
Workspace Db2
Components Serviceability
Created by Guest
Created on Dec 18, 2014

New access path for faster first fetch with a good global time

Firstly, I don't know if it is possible. We can encounter this following performance issue : select on a big table with an order by. Depending on the statistics, we can have list prefetchs on an index. If the index is very big, we have to wait a long time to sort all the rids although it could be interesting to fetch so that the next steps in the program logic are executed during the rids sort.

We can disable the list prefetch to have fastly the first fetched rows but the total time of the request could increase. So the idea should to have a new access path to sort the rids in background but to fetch frequently some rows so that the program executes in parallel.