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 jonathanlewis.wordpress.com
Heisenberg | Oracle Scratchpad
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About Oracle: dbms_xplan.display_cursor
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| | About Oracle
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??????? ??????: FIRST_ROWS ? CURSOR_SHARING_EXACT | Oracle mechanics
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| | ??????? ?????? ?? ??????? ??????????? 465 ??????! SELECT A.ID, A.LOGIN, A.NAME, A.LASTNAME, A.EMAIL FROM ACCOUNT A WHERE (A.LOGIN LIKE '%%') AND (A.NAME LIKE '%????????%' OR A.LASTNAME LIKE '%????????%') AND A.COMPANY_ID = 1 ORDER BY A.LOGIN ??? ???????, ????????? ???? ?? ??????? A.COMPANY_ID = 1 ???????? ??????? ???????????????? SQL> SELECT 'ALL' as "Condition", count(*) FROM ACCOUNT...
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Kerry Osborne's Oracle Blog » Blog Archive » GATHER_PLAN_STATISTICS
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A Data Model Fix for Suboptimal Semi-Join and Anti-Join Cardinality Estimates - All-round Database Topics
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| Analysis of dataset properties leading to a bad performance problem with a simple fix.