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savvinov.com | ||
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iggyfernandez.wordpress.com
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| | | | | Dear NoCOUG members and friends, The golden rule of not tuning SQL is "operate with as little information as possible." Not only will this increase your chances of failure but it will make it difficult for others to help you. Every exercise in problem solving - no matter how little - has exactly six stages:... | |
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jonathanlewis.wordpress.com
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| | | | | [More on dbms_xplan.display_cursor()] If you're using 9i and haven't learned about the dbms_xplan package, then you should take a good look atit right away. It's(usually) a much better wayof getting execution plans from your system thanwriting yourown queries against the plan_table. If you'vebeen using dbms_xplan, and upgraded from 9i to 10g, make sure that you... | |
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jonathanlewis.wordpress.com
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| | | | | In an earlier articleI described how dbms_xplan.display_cursor() could be used to query memory to find the execution plans (and row source statistics) of recently executed SQL. In 9i, you have to use your own SQL to get the equivalent results. If you do, you should avoid using the "traditional" hierarchical type of query that you... | |
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www.bobbydurrettdba.com
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| | | We have been discussing query tuning at work and I've come back to an example of the Oracle optimizer choosing the wrong plan due to an error in its calculation of the number of rows returned... | ||
