Re: Why our counters need to be time-based WAS: WIP: cross column correlation ...

On Mon, Feb 28, 2011 at 1:50 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Josh Berkus <josh@agliodbs.com> writes:
>> On 2/28/11 10:24 AM, Robert Haas wrote:
>>> On Mon, Feb 28, 2011 at 1:04 PM, Josh Berkus <josh@agliodbs.com> wrote:
>>>> On the other hand, anything which increases the size of pg_statistic
>>>> would be a nightmare.
>
>>> Hmm?
>
>> Like replacing each statistic with a series of time-based buckets, which
>> would then increase the size of the table by 5X to 10X.  That was the
>> first solution I thought of, and rejected.
>
> I think Josh is thinking of the stats collector's dump file, not
> pg_statistic.

Yeah.

> Ultimately we need to think of a reporting mechanism that's a bit
> smarter than "rewrite the whole file for any update" ...

Well, we have these things called "tables".  Any chance of using those?

--
Robert Haas
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