Re: Problem with database performance, Debian 4gb ram ?

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Please keep the list copied.
 
Grant Masan <grant.massan@xxxxxxxxx> wrote:
 
> CREATE FUNCTION ... RETURNS SETOF ...
 
> FOR ... IN SELECT ... LOOP
 
>     FOR ... IN SELECT ... LOOP
 
> FOR ... IN SELECT ... LOOP
> 
>                 RETURN NEXT text_output;
> 
>             END LOOP;
>     END LOOP;
>     END LOOP;
 
I don't have time to work through the logic of all this to try to
discern what your goal is; but in my experience, such procedural code
can usually be rewritten as a single query.  The results are typically
orders of magnitude better.
 
> SELECT * FROM info_tool(linest,date,date)
 
> "Function Scan on info_tool  (cost=0.00..260.00 rows=1000 width=108)
> (actual time=437712.611..437712.629 rows=14 loops=1)"
> "Total runtime: 437712.686 ms"
 
To get useful information you need EXPLAIN ANALYZE from statements
inside the function, not of the execution of the function.
 
-Kevin

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