On 2015-06-12 13:21:33 +0000, polpot78@gmail.com wrote:
> When a seq scan is performed, but no real disk reads is performed, then
> postgreSQL still reports that disk-reads are performed. iostat reports that
> no Blocks are read.
Note that postgres' reports everything as a disk read that goes to the
OS. Which then does it's own level of caching.
Greetings,
Andres Freund