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Re: WAL being written during SELECT * query

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2017-04-10 16:49 GMT+02:00 Bill Moran <wmoran@xxxxxxxxxxxxxxxxx>:

> >> On Tue, Apr 4, 2017 at 9:46 AM, Tom DalPozzo <t.dalpozzo@xxxxxxxxx>
> >> 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@xxxxxxxxxxxxxxxxx>

Hi, OK! Thank you very much
Pupillo


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