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 www.bobbydurrettdba.com
Cardinality errors across joins | Bobby Durrett's DBA Blog
| | oracle-randolf.blogspot.com
Oracle related stuff: Getting first rows of a large sorted result set quickly - NOSORT issues
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| | When attempting to display only the first n rows of a result set that is ordered the Oracle optimizer offers special optimizations for these...
| | www.dbaglobe.com
Donghua's Blog - DBAGlobe: Subquery Performance Tuning (Part 2, NOT IN and NOT EXISTS))
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| | A blog about on new technologie. Hands-on note about Hadoop, Cloudera, Hortonworks, NoSQL, Cassandra, Neo4j, MongoDB, Oracle, SQL Server, Linux, etc.
| | blog.sqlora.com
Fix Optimizer Estimate Issues from Implicit Conversions #JoelKallmanDay
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| | Learn how implicit RAW-to-VARCHAR2 conversions in Oracle break histograms, hurt optimizer estimates, and how to fix them safely.
| | blog.tanelpoder.com
About index range scans, disk re-reads and how your new car can go 600 miles per hour! | Tanel Poder Consulting
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| Despite the title, this is actually a technical postabout Oracle, disk I/O and Exadata & Oracle In-Memory Database Optionperformance. Read on :) If a car dealertells you that this fancy new car on display goes 10 times (or 100 or 1000) faster than any of your previous ones, then either the salesman is lying or this new car is doing something radically differentfrom all the old ones. You don't just get orders of magnitude performance improvements by making small changes. Perhaps the car bends space around...