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MQTs with REFRESH IMMEDIATE need to allow more flexible definitions(RIMS)
1. MQTs with REFRESH IMMEDIATE need to allow more flexible definitions. To make MQTs feasible for an environment where quick ingest and low data latency is a priority, they cant be REFRESH DEFERRED because of the excessive locking that occurs during either REFRESH TABLE or a user-managed load process. However, in order to define an MQT as REFRESH IMMEDIATE, a number of restrictions apply. These include the requirement to remove duplicate rows, the lack of support for inner joins, and the requirement to do aggregation. In many cases, we have had to break one MQT into multiple MQTs, for the sole purpose of avoiding the overhead of a REFRESH TABLE process. We have also had to add a number of otherwise unnecessary columns to the MQT definition just to guarantee uniqueness. Most frustrating of all, when MQTs are developed, we are nearly always playing reason code ping pong between all the various SQL20058N errors. Our requirement is to remove as many restrictions from REFRESH IMMEDIATE as possible in order to make MQTs a fully functional performance technique. PRIORITY: HIGH Angie Richey
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