| From: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com> |
|---|---|
| To: | Matheus de Oliveira <matioli(dot)matheus(at)gmail(dot)com> |
| Cc: | pgsql-performance <pgsql-performance(at)postgresql(dot)org>, Charles Gomes <charlesrg(at)outlook(dot)com> |
| Subject: | Re: Partition insert trigger using C language |
| Date: | 2013-01-10 18:54:57 |
| Message-ID: | 50EF0E81.1010808@vmware.com |
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| Lists: | pgsql-performance |
On 10.01.2013 20:45, Matheus de Oliveira wrote:
> Inspired by Charles' thread and the work of Emmanuel [1], I have made some
> experiments trying to create a trigger to make partitioning using C
> language.
>
> The first attempt was not good, I tried to use SPI [2] to create a query to
> insert into the correct child table, but it took almost no improvement
> compared with the PL/pgSQL code.
The right way to do this with SPI is to prepare each insert-statement on
first invocation (SPI_prepare + SPI_keepplan), and reuse the plan after
that (SPI_execute_with_args).
If you construct and plan the query on every invocation, it's not
surprising that it's no different from PL/pgSQL performance.
- Heikki
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