Re: ShmemAlloc errors

On Sun, 19 Oct 2003, Greg Stark wrote:

>
> Holger Marzen <holger@marzen.de> writes:
>
> > I use PostgreSQL for counting network traffic, I use a sample every five
> > minutes. Because my queries became too slow I simply added another table
> > that holds the data per day. Every day, yesterday's data get added,
> > inserted into the "day"-table and deleted from the 5-minutes-table. I
> > don't need the 5 minutes accuracy for all of the data.
>
> The original poster said he needed the 5 minute data.

Yes, but how long? Really for months? The above way of compressing data
can be altered, e.g. he could keep the 5 minutes data for a week or a
month and use the daily data for billing.

> However, perhaps a combination could be a good compromise. We used to keep raw
> one-record-per-hit data in a table and queried that for statistics. Later we
> aggregated the data once per hour but kept the raw data as well. The reports
> used the aggregate data for speed but the raw data was still available for
> debugging or auditing.

Yes, exactly.

> This was very handy when the database became too large, we started purging the
> raw data after 30 days but the reports were all still fine as we could keep
> the aggregate data indefinitely.

Yup.

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