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savvinov.com | ||
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dioncho.wordpress.com
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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kerryosborne.oracle-guy.com
[AI summary] A technical investigation into whether Oracle SQL Plan Baselines store actual execution plans or rely on hidden hints, analyzing database trace files and data dictionary views. |
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jonathanlewis.wordpress.com
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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blog.yannickjaquier.com
Automatic SQL Tuning Sets (ASTS) can be of great help to auto repair SQL queries that have diverged from their ideal execution plan |
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