Sql Query Optimization Techniques In Oracle
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Sql Query Optimization Techniques In Oracle
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Best Ways To Fine Tune Your SQL Queries MyTechMint
4 This is a massive area of expertise aka a black art The approach I generally take is Run the SQL statement in question Get the actual plan look up dbms xplan Compare the estimated number of rows cardinality vs actual number of rows A big difference indicates a problem to be fixed e g index histogram Optimize access structures Database design and normalization Tables heap or index organized tables and table or indexed clusters Indexes Constraints Materialized views Partitioning schemes Statistics including a comprehensive refresh strategy Rewrite SQL statements Exclude projections that are not required
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