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You are here		tanelpoder.com Alter session force parallel query doesn't really force anything \| Tanel Poder Blog
\|	\|	blog.tanelpoder.com Optimizer statistics-driven direct path read decision for full table scans (_direct_read_decision_statistics_driven) \| Tanel Poder Blog Hello all fellow Oracle geeks and technology enthusiasts! Long time no see ;-) In the hacking session about Oracle full table scans and direct path reads I explained how the direct path read decision is not done by the optimizer, but instead during every execution, separately for every single segment (partition) scanned in the query. I also explained how the _small_table_thresholdparameter and theX$KCBOQH.NUM_BUF(which keeps track of how many buffers of any segment are currently cached) are used for determining whether to scan using direct path reads or not. - Linux, Oracle, SQL performance tuning and troubleshooting training & writing.	1.7 parsecs Travel
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\|	\|	www.dbaglobe.com Donghua's Blog - DBAGlobe: Subquery Performance Tuning (Part 1, IN, EXISTS and COUNT >0) A blog about on new technologie. Hands-on note about Hadoop, Cloudera, Hortonworks, NoSQL, Cassandra, Neo4j, MongoDB, Oracle, SQL Server, Linux, etc.	1.5 parsecs Travel
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\|	\|	leonotes.wordpress.com (transitive closure)?(Constraint-Generated Predicates) \| LEO Notes transitive closure?Wiki?Oracle?...	1.7 parsecs Travel
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\|	\|	www.dbaglobe.com Donghua's Blog - DBAGlobe: Subquery Performance Tuning (Part 2, NOT IN and NOT EXISTS)) A blog about on new technologie. Hands-on note about Hadoop, Cloudera, Hortonworks, NoSQL, Cassandra, Neo4j, MongoDB, Oracle, SQL Server, Linux, etc.	15.7 parsecs Travel
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