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iggyfernandez.wordpress.com | ||
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hourim.wordpress.com
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| | | | | The last Jonathan Lewis post on RAC Planswhich finished by the following phrases: "If you're going to hard-code hints into a query then take a look at the outline it generates when it does the right thing, and that will tell you about the 15 or so hints you've missed out. (Better still, consider generating... | |
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optimizermagic.blogspot.com
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| | | | | This blog post has moved here http://blogs.oracle.com/optimizer/entry/whats_changed_between_my_new_query_plan_and_the_old_one | |
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alexzeng.wordpress.com
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| | | | | I am reading Expert Oracle Practices by Oracle Database Administration from the Oak Table. I'd like to summary and share what I learned. This chapter PL/SQL and the CBO by Jo?e Senega?nik is pretty interesting. It tells how to use oracle extensible optimizer to set the selectivity and the cost of PL/SQL functions. This will... | |
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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. | ||
