There is a significant amount of code supporting the changing of full_page_writes while the server is running, including an XLOG_FPW_CHANGE wal record. But I don't see the use-case; surely almost nobody changes this on a running server, because either your filesystem guarantees atomic page writes for you or not.
I'd like to submit a patch to just make it into a PGC_POSTMASTER and remove the code to support changing it. Then, I intend to write another patch to make the full-page writes for checksums honor the full_page_writes setting. That will be easier to write once it's a PGC_POSTMASTER. Any reason to keep the setting as a PGC_SIGHUP? Regards, Jeff Davis -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers