Re: PostgreSQL intenal scheduler?

On 05/09/18 16:06, Thiemo Kellner wrote:
>
> Hi all
>
> I am designing a framework for historisation implementation (SCD). One
> feature I would like to provide is a table in that the actual state of
> an entity is put and if this is complete, this history table is
> "updated":
>
>       ------------         -------------
> ==>  | ENTITY_ACT |  ==>  | ENTITY_HIST |
>       ------------         -------------
>
> I plan to use instead-of-triggers on the hist table that read the
> actual table and perfoms all necessary inserts und updates on the
> history table. If I want the termination of a record version (actually
> the record of a specific business key with a specific payload) to get
> propagated up and/or down referential integrities (no overlapping
> validities) I have to make sure that only one of those processes is
> modifying a table. I was thinking of a scheduler queue where the
> trigger would put a process request and PostgreSQL would work through.
> Is there a scheduler within PostgreSQL? I read the documentation and
> searched the web but could not find a hint. But before going another
> road or implementing something myself, I ask. Maybe this design is no
> good at all.
>
> Kind regards
>
> Thiemo
>
>

Why not just call your "do a scheduled run" code from cron?

Tim Clarke