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IBM Data and AI Ideas Portal for Customers

This portal is to open public enhancement requests against products and services offered by the IBM Data & AI organization. To view all of your ideas submitted to IBM, create and manage groups of Ideas, or create an idea explicitly set to be either visible by all (public) or visible only to you and IBM (private), use the IBM Unified Ideas Portal (

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Status Not under consideration
Created by Guest
Created on Mar 3, 2020

Improve AOT backup performance

We're using IDAA loader V 2.1 to run backups for very huge AOTs. When IDAA loader takes a backup from an IDAA AOT it uses SQL multirow fetch to transfer the data from IDAA into a z/OS sequential file. This may work fine for small AOTs. But in our environment the AOTs are very big and the SQL fetch mechanism to backup the data is not a good choice since this leads to very high CPU usage and very long elapse times. For example we determine a 70 time longer elapse time, 35 time higher CPU usage, 2.8 time higher I/O-Count and 46 time higher SU count (including zIIP-SU for the IDAA loader Backup Utility) compared to a full DSNUTILB IC for a table containing the same data in Db2 for z/OS and on IDAA. (51'239'384'238 Rows)

From a product like the IDAA loader we expect a much better backup performance. There should be another mechanism than SQL fetch to transfer the data from IDAA to z/OS. For example DSNUTILB uses direct access paths to the VSAM Cluster to read the data instead of fetching it.

Needed by Date Mar 31, 2020
  • Guest
    Mar 3, 2020

    Good to know, thanks for sharing