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 dincosman.com
Direct Path Read Decision in Oracle: Beyond the Optimizer - Osman's DBlog
| | blog.tanelpoder.com
Optimizer statistics-driven direct path read decision for full table scans (_direct_read_decision_statistics_driven) | Tanel Poder Blog
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| 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.