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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.
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