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nenadnoveljic.com | ||
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dioncho.wordpress.com
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| | | | | One of my colleagues sent following test case, of which he couldn't control the join order with hints. 1. Create objects - table t1, t2 and t3 2. Now Let's set the join order as T1->T2->T3, using global hints convention. But it seems that Oracle does not work as expected. It really seems that the... | |
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mauro-pagano.com
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| | | | | 12c brought several new features in the SQL performance area and the most advertised one is probablyAdaptive Query Optimization. The Adaptive Plans feature has been described in a lot of details (specially the adaptive join methods part) and most of the focus in Adaptive Statistics has been on SQL Plan Directives and Automatic Re-optimization, not... | |
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hourim.wordpress.com
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| | | | | I like very much Tanel Poder snapper and Carlos Sierra SQLTXPLAIN. They represent valuable performance diagnostic tools. Unfortunately I am still waiting to find a customer site where I will be allowed or granted necessary privileges to install and to use them. There are client sites where I have been asked to tune queries without... | |
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nenadnoveljic.com
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| | | Oracle's heuristics previously avoided considering fixed tables for Join Predicate Pushdown (JPPD) transformation, leading to suboptimal plans. Enforcing predicate pushing into the view with the PUSH_PRED hint was a workaround. Oracle addressed this in the 21c release, evaluating fixed tables for JPPD. | ||
