On 28 May 2014 15:34, Fujii Masao <masao.fu...@gmail.com> wrote: >> Also, compress_backup_block GUC needs to be merged with full_page_writes. > > Basically I agree with you because I don't want to add new GUC very similar to > the existing one. > > But could you imagine the case where full_page_writes = off. Even in this > case, > FPW is forcibly written only during base backup. Such FPW also should be > compressed? Which compression algorithm should be used? If we want to > choose the algorithm for such FPW, we would not be able to merge those two > GUCs. IMO it's OK to always use the best compression algorithm for such FPW > and merge them, though.
I'd prefer a new name altogether torn_page_protection = 'full_page_writes' torn_page_protection = 'compressed_full_page_writes' torn_page_protection = 'none' this allows us to add new techniques later like torn_page_protection = 'background_FPWs' or torn_page_protection = 'double_buffering' when/if we add those new techniques -- Simon Riggs http://www.2ndQuadrant.com/ PostgreSQL Development, 24x7 Support, Training & Services -- Sent via pgsql-hackers mailing list (firstname.lastname@example.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers