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

2012/2/29 Jeff Janes <jeff.janes@gmail.com>:
>> It's quite possible the vacuum full is thrashing your disk cache due
>> to maintainance_work_mem. You can overcome this issue with the tar
>> trick, which is more easily performed as:
>>
>> tar cf /dev/null $PG_DATA/base
>
> But on many implementations, that will not work.  tar detects the
> output is going to the bit bucket, and so doesn't bother to actually
> read the data.

Right.
But what about the commands cp $PG_DATA/base /dev/null or cat
$PG_DATA/base > /dev/null ?
They seem to do something.

-Stefan