On Sat, Feb 25, 2023 at 01:44:36PM +0900, Michael Paquier wrote: > On Fri, Feb 24, 2023 at 01:18:40PM -0600, Justin Pryzby wrote: > > This is a draft patch - review is welcome and would help to get this > > ready to be considererd for v16, if desired. > > > > I'm going to add this thread to the old CF entry. > > https://commitfest.postgresql.org/31/2888/ > > Patch 0003 adds support for the --long option of zstd, meaning that it > "enables long distance matching with #windowLog". What's the benefit > of that when it is applied to dumps and base backup contents?
It (can) makes it smaller. + The <literal>long</literal> keyword enables long-distance matching + mode, for improved compression ratio, at the expense of higher memory + use. Long-distance mode is supported only for + With zstd compression, <literal>long</literal> mode may allow dumps + to be significantly smaller, but it might not reduce the size of + custom or directory format dumps, whose fields are separately compressed. Note that I included that here as 003, but I also have an pre-existing patch for adding that just to basebackup. -- Justin