Re: PG as in-memory db? How to warm up and re-populate buffers? How to read in all tuples into memory?

2012/2/26 Andy Colson <andy@squeakycode.net> wrote:
> On 02/25/2012 06:16 PM, Stefan Keller wrote:
>> 1. How can I warm up or re-populate shared buffers of Postgres?
>> 2. Are there any hints on how to tell Postgres to read in all table
>> contents into memory?
>>
>> Yours, Stefan
>
> How about after you load the data, vacuum freeze it, then do something like:
>
> SELECT count(*) FROM osm_point WHERE tags @> 'tourism=>junk'
>
> -Andy

That good idea is what I proposed elsewhere on one of the PG lists and
got told that this does'nt help.

I can accept this approach that users should'nt directly interfere
with the optimizer. But I think it's still worth to discuss a
configuration option (per table) or so which tells PG that this table
contents should fit into memory so that it tries to load a table into
memory and keeps it there. This option probably only makes sense in
combination with unlogged tables.

Yours, Stefan