On Sun, Jun 10, 2012 at 11:41 PM, Amit Kapila <amit.kap...@huawei.com> wrote: >>>Uh... no. The whole point of doing things in shared buffers is that >>>you don't have to write and fsync the buffers immediately. Instead, >>>buffer evicting handles that stuff for you. > > So you mean to say that there exists operations where Xlog is not required > even though it marks the buffer as dirty for later eviction.
Correct. >>>I don't see why it's any different from log_newpage() in that regard. >>>That data is initialized before being written, as well, but someone >>>contemplated the possible need to write a page of all zeros. > > The comment above the code indicates that "the page is uninitialized". > Does the code consider page with all zero's as uninitialized or the comment > is not > appropriate. Yes, all zeroes = uninitialized. -- Robert Haas EnterpriseDB: http://www.enterprisedb.com The Enterprise PostgreSQL Company -- Sent via pgsql-hackers mailing list (pgsql-hackers@postgresql.org) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers
