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DB2 does not identify the tables as collocated even though they exist on the same set of db partitions because they reside in different database partition groups. The optimizer doesn't always make a good choice when comparing plans in DPF. With th...
Why isn't CLIENT_USERID special register populated correctly by default(RIMS)
The customer was looking to create a table trigger using the CLIENT_USERID special register in order to populate a column that would indicate the actual OS user that last updated or inserted a row in a table. He later found out that this special r...
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 dur...
Calisto suggested if the MOD function FF issue is pervasive in the customer's environment, we could do an enhancement(under regvar maybe), so please ask for it. I will ask Satya to collect the stats across the partitions. The current stats shows a...
new optimizer guideline to break CSE for a specific query or as a global guideline(RIMS)
Customer encountered scenario where use of CSE resulted in degradation in query performance (details below). This requirement is to implement a new optimizer guideline that will allow customer to break CSE for a specific query or as a global guide...
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