Re: WAL format

Tom Lane wrote:
> Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com> writes:
>> In particular I wonder why we bother with the page headers. A much
>> simpler format would be:
>
>> - get rid of page headers, except for the header at the beginning of
>> each WAL segment
>> - get rid of continuation records
>> - at the end of WAL segment, when there's not enough space to write the
>> next WAL record, always write an XLOG SWITCH record to fill the rest of
>> the segment.
>
> What do you do with a WAL record that doesn't fit in a segment? (They
> do exist.) I don't think you can eliminate continuation records.
> You could maybe use them only at segment boundaries but I doubt that
> makes things any simpler than they are now.

Hmm, yeah, it doesn't make it that much simpler then.

--
Heikki Linnakangas
EnterpriseDB http://www.enterprisedb.com