On 19 January 2017 at 09:37, Kyotaro HORIGUCHI
<horiguchi.kyotaro@lab.ntt.co.jp> wrote:
>
> Though I haven't look closer to how a modification is splitted
> into WAL records. A tuple cannot be so long. As a simple test, I
> observed rechder->xl_tot_len at the end of XLogRecordAssemble
> inserting an about 400KB not-so-compressable string into a text
> column, but I saw a series of many records with shorter than
> several thousand bytes.
I think the case to check is a commit record with many thousands of
subtransactions. I'm not sure you can fill a whole segment though.
--
greg