Re: WAL being written during SELECT * query

2017-04-10 16:49 GMT+02:00 Bill Moran <wmoran(at)potentialtech(dot)com>:

>
> > >> On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo <t(dot)dalpozzo(at)gmail(dot)com>
> > >> wrote:
> > >> > Hi,
> > >> > I have a very big table (10GB).
> > >> > I noticed that many WAL segments are being written when elaborating
> read
> > >> > only transactions like this:
> > >> > select * from dati25600000000 where id >43000000 limit 1000000;
> > >> > I don't understand why are there WAL writings during read only
> > >> transactions.
>
> These are hint bits. The mechanism and behavior are known and documented:
> https://wiki.postgresql.org/wiki/Hint_Bits
>
> --
> Bill Moran <wmoran(at)potentialtech(dot)com>
>

Hi, OK! Thank you very much
Pupillo