>-----Original Message----- >From: Nico Williams [mailto:n...@cryptonector.com] >On Tue, Jun 12, 2018 at 09:05:23AM +0000, Ideriha, Takeshi wrote: >> >From: Surafel Temesgen [mailto:surafel3...@gmail.com] >> >Subject: ON CONFLICT DO NOTHING on pg_dump >> >> >Sometimes I have to maintain two similar database and I have to update one >> >from >the other and notice having the option to add ON CONFLICT DO NOTHING clause to >>INSERT command in the dump data will allows pg_restore to be done with free of >ignore error. >> >> Hi, >> I feel like that on-conflict-do-nothing support is useful especially coupled >> with >--data-only option. >> Only the difference of data can be restored. > >But that's additive-only. Only missing rows are restored this way, and >differences are >not addressed. > >If you want restore to restore data properly and concurrently (as opposed to >renaming >a new database into place or whatever) then you'd want a) MERGE, b) dump to >generate MERGE statements. A concurrent data restore operation would be rather >neat.
I agree with you though supporting MERGE or ON-CONFLICT-DO-UPDATE seems hard work. Only ON-CONCLICT-DO-NOTHING use case may be narrow. -- Takeshi