Michael Paquier <michael.paquier@gmail.com> writes: > On Thu, Jan 22, 2015 at 11:06 PM, Andrey Lizenko <lizenko79@gmail.com> wrote: >> 3. They are not WAL-logged. >> Whats wrong with it in my case?
> Nothing. Temporary tables are not WAL-logged, but transaction commit is.
Right. I think there is some optimization for transactions that only wrote temp-table data, but it could at most be skipping fsync of the transaction commit record, not omitting generating it entirely.
Also, changes to the system catalogs are always WAL-logged; so creation and deletion of a temp table cause some amount of WAL output, even if manipulation of the table's contents does not.