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hourim.wordpress.com | ||
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orastory.wordpress.com
There have been some interesting posts from Marcin Przepiorowski and Kerry Osborne about mapping sql plan management (spm) baselines to a corresponding sql id. The key to sql plan baselines (DBA_SQL_PLAN_BASELINES) is SIGNATURE. And why signature? It's not just another change to the key to identifying sql statements (HASH_VALUE -> (NEW_)HASH_VALUE / OLD_HASH_VALUE -> SQL_ID).... |
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blog.toadworld.com
Why my execution plan has not been shared - Part I |
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kerryosborne.oracle-guy.com
[AI summary] The article discusses techniques for using SQL Profiles to influence query optimization in Oracle databases, building on previous methods like outline switching. |
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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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