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My favorite Oracle articles and websites on Oracle performance tuning:

Websites:

• Jonathan Lewis scratchpad
• EvDBT.com (Tim Gorman/Jeff Maresh) papers
• Centrex Consulting (Wolfgang Breitling)
• Hotsos (Cary Millsap)
• The oaktable network

Papers

• Fallacies of the Cost Based optimizer (Wolfgang Breitling)
• A Look under the Hood of CBO: The 10053 Event  (Wolfgang Breitling)
• Histograms - Myths and Facts (Wolfgang Breitling)
• Tuning by Cardinality Feedback (Wolfgang Breitling)
• Joins, skew and histograms (Wolfgang Breitling)
• Scaling to infinity - Partitioning in Oracle Data Warehouses (Tim Gorman)

Links

Some of my favorite books on Oracle performance tuning:

My Oracle blog: