Am 06.04.22 um 17:49 schrieb Robert Haas: > I feel like if you want to know whether externalization made a > difference, you can look at the size of the TOAST table. And by > selecting directly from that table, you can even see how many chunks > it contains, and how many are full-sized chunks vs. partial chunks, > and stuff like that. And for compression, how about looking at > pg_column_size(col1) vs. pg_column_size(col1||'') or something like > that? You might get a 1-byte varlena header on the former and a 4-byte > varlena header on the latter even if there's no compression, but any > gains beyond 3 bytes have to be due to compression.
I'll probably give that a shot! It does feel a bit like noting your mileage on fuel receipts though, as I've done until I got my first decent car; works and will work perfectly well up to the day, but certainly is a bit out-of-time (and requires some basic math skills ;-). Best, -- Gunnar "Nick" Bluth Eimermacherweg 106 D-48159 Münster Mobil +49 172 8853339 Email: gunnar.bl...@pro-open.de __________________________________________________________________________ "Ceterum censeo SystemD esse delendam" - Cato
