Re: Will modifications to unlogged tables also be flused to disk?

Clemens Eisserer <linuxhippy@gmail.com> wrote:

> Hi,
>
> I would like to use postgresql's unlogged tables on an embedded system
> to avoid frequent writes to flash memory.
> While documentation clearly states that unlogged tables don't have to
> go through the WAL, it doesn't mention what happens to the data when
> it is written directly to the database.
>
> Will unlogged tables also cause sync/fsync calls, or will they stay in
> the page cache of the system as they will be lost anyway after a
> recovery?
>
> Thank you in advance, Clemens

They will lost after a crash, but after a regular shutdown / restart all
data in the table.


Andreas
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