Tag Archives: process skew

A Method for Handling Process Skew with Unknown Defaults

Back in the post Distributed Joins, Process Skew I mentioned a common cause of process skew were default values such as -1 for an “Unknown” customer creating skew when a redistribution happened on that customer key and there was a significant … Continue reading

Posted in Performance Tuning for Netezza | Tagged , , | Leave a comment

Distributed Joins, Process Skew

This post will build on concepts introduced in the Distributed Joins, The Basics and Distributed Joins, Modeling for Colocation posts.  I’m assuming some familiarity with table skew, where a distribution key is chosen where some key values has significantly more rows than … Continue reading

Posted in Best Practices, Performance Tuning for Netezza | Tagged , , , , | 8 Comments