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Don Burleson Blog 







Oracle Analytic Functions tips

Oracle Tips by Burleson Consulting

Oracle SQL provides analytic functions and Oracle allows you to define your own analytic functions using PL/SQL.

By creating your own Oracle analytic functions you can extend your dialect of SQL and add your own special data transformations. 

Oracle Analytic Functions are explained here in this Tuning Tip.  Also see these tips on analytic functions:

Oracle Guru Steve Callan notes that in some cases an analytic function can run a hundred times faster than regular SQL that does the analytic with a subquery:

-- Using Analytic Function
select    id,
    sum(salary) over (order by id) cume_salary
    order by id;  

Using AF: 0.84 seconds

           1  recursive calls
           0  db block gets
         290  consistent gets
           0  physical reads
           0  redo size

-- ********************************
-- Using regular SQL
-- ********************************
       emp e2   
    where <=
    AS cume_salary
    emp e1
    order by id;

-- ********************************
-- Using regular SQL: over 8 minutes
-- ********************************

       1  recursive calls
       0  db block gets
11200335  consistent gets –over 38,000 times as many
     255  physical reads
       0  redo size

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