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Watson Query (WQ) is based on IBM's decades-old federation technology (DataJoiner, et al). In Federation Indexes on remote objects are propagated back to Db2 and populate SYSCAT.INDEXES. These Index specifications help inform the federated server optimizer of the most efficient access path to retrieve data from the remote server.
https://www.ibm.com/docs/en/db2/11.5?topic=specifications-index-in-federated-system
This is not currently happening in WQ. The most likely reason is that WQ uses a single Wrapper rather than individual Wrappers for each type of remote data source (e.g. Oracle, SQL Server, MySQL, etc.) and a single Server (QPLEX).
I would like to see the legacy functionality of federation in this regard be incorporated into WQ for more efficient query processing.
Needed By | Quarter |
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