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IBM Data and AI Ideas Portal for Customers

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Created by Guest
Created on Aug 22, 2019

ANSI SQL-99 Support in DVM

A customer recently conducted a PoC using DVM and z/OS Connect as an alternative to an existing ETL based system which does nightly offloads of IMS data from the mainframe into a SQL Server database which is accessed by client applications.

The existing SQL Server ETL solution uses Common Table Expressions (CTE), which are part of the ANSI SQL-99 support. When attempting to recreate those queries against a DVM Virtual Table backed by an IMS Datasource, the customer was not able to duplicate their existing queries in DVM due to lack of CTE support, since DVM does not support ANSI SQL-99.

The workaround for the PoC was to use the Db2 for z/OS SQL engine via UDTF’s, but the inability to pass the SQL WHERE predicate properly resulted in poor performance.

  • Guest
    Apr 15, 2021

    New SQL 99 support is coming in a release of DVM in 1H 2021. We will continue to add more capability in this area QtQ and if any customer has the interest to provide early validation prior to delivery into the product, please contact me directly to enroll in our continuous early program.

  • Guest
    Mar 31, 2020

    IBM recognizes the value of an updated ANSI SQL base to better service newer SQL function. IBM will be working to identify specific SQL scenarios and work to support those, as opposed to a complete ANSI SQL compliance for the latest release. Customers can leverage Db2 for z/OS to leverage ANSI SQL 2016 compliance by leveraging DVM for z/OS ability to create UDTFs/Views in a Db2 for z/OS database server to establish mappings to z/OS sources.

    This approach would redirect applications through Db2 for z/OS to access DVM for z/OS generated UDTF/Views that would then traverse through DVM for z/OS to access data. Inbound client applications would be able to parse more currency with SQL through the Db2 for z/OS parser and send along execution strings to DVM for z/OS for access to underlying z/OS data sources.

    Alternatively, IBM is targeting specific high use case SQL statement requirements and addressing these individually, as we work to consider a more complete leveling of currency to ANSI SQL 2016.