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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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Post ideas and requests to enhance a product or service. Take a look at ideas others have posted and upvote them if they matter to you,

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Status Not under consideration
Workspace Db2
Components Other/Unknown
Created by Guest
Created on Nov 22, 2017

Differentiate between Read and Write IO performance (Overhead and TransferRate) and optimise accordingly

Background: Db2 is sensitive to IO performance, and compiles access plans accordingly to optimise IO versus CPU costs. At the tablespace level, average Overhead and TransferRate are configured in units of milliseconds.

Issue: customers such as ourselves have very different Read and Write IO performance. In our case, the underlying disks are mirrored using MetroMirror (synchronous PPRC) which means that reads occur at normal speeds but writes take much longer.

Db2 should be made aware of both Read and Write performance, and should optimize access plans (and other internal functions) accordingly to minimise total CPU, read and write costs.

Note: in Db2 9.7, columns WRITEOVERHEAD and WRITETRANSFERRATE were added to SYSCAT.TABLESPACES, temptingly making it look like Db2 was about to introduce the requested functionality; however these columns are still flagged "Reserved for future use."