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antognini.ch | ||
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jonathanlewis.wordpress.com
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| | | | | There is some confusion about the expression "clean" in Oracle circles, so I thought I'd write a short note to explain the different ways in which the word may be applied to Oracle blocks. There are five terms to consider: clean commit cleanout block cleanout delayed block cleanout delayed logging block cleanout Clean: A block... | |
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blog.tanelpoder.com
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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. | |
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dincosman.com
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| | | | | The performance issue with an SQL query was resolved by using the /*+ PARALLEL(2) */ hint, reducing execution time from 180-200 seconds to milliseconds. The decision to perform a direct read from disk to memory instead of reading blocks from disk was made by the database engine and is controlled by the hidden "_serial_direct_read" parameter.... | |
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karenmorton.blogspot.com
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| | | Becoming an Everyday Oracle Pro (2013 November 12) SQL Tuning Fundamentals - Execution Plans (2013 September 17) Visual SQL Tun... | ||
