On 19 January 2017 at 09:37, Kyotaro HORIGUCHI <horiguchi.kyot...@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
