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www.xt-r.com | ||
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chandlerdba.com
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| | | | | In my previous post, I wrote about the time I made a mistake specifying a hint via a SQL Patch, meaning it "didn't work". This leads to an understanding about the classification of hints - some hints are used for the Optimizer/CBO, but other hints have different reasons for being used. For example APPEND is... | |
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jonathanlewis.wordpress.com
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| | | | | Jump to summary. A new optimizer feature that appears in 23c (probably not 21c) was the ability to push group by clauses into union all set operations. This will happen unhinted, but can be hinted with the highly memorable [no_]push_gby_into_union_all() hint that appeared in 23.1.0.0 according to v$sql_hint. and the feature can be disabled by... | |
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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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rwijk.blogspot.com
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