On 2017-12-01 16:14:58 -0500, Robert Haas wrote: > Honestly, if we can give everybody a 4% space reduction by switching > to lz4, I think that's totally worth doing -- but let's not make > people choose it, let's make it the default going forward, and keep > pglz support around so we don't break pg_upgrade compatibility (and so > people can continue to choose it if for some reason it works better in > their use case). That kind of improvement is nothing special in a > specific workload, but TOAST is a pretty general-purpose mechanism. I > have become, through a few bitter experiences, a strong believer in > the value of trying to reduce our on-disk footprint, and knocking 4% > off the size of every TOAST table in the world does not sound > worthless to me -- even though context-aware compression can doubtless > do a lot better.
+1. It's also a lot faster, and I've seen way way to many workloads with 50%+ time spent in pglz. Greetings, Andres Freund
