On 09/24/2017 11:03 AM, Vladimir Mihailenco wrote: > Thanks for your response. Ss I understand it now the difference is > that checkpoints are synchronous but dirty pages eviction from shared > buffers are asynchronous, correct? How then Postgres ensures that OS > writes data to the disk so WAL can be deleted? > The last step in a checkpoin is fsync() on the files. Without that, the checkpoint is considered incomplete and the database won't rely on it. regards -- Tomas Vondra http://www.2ndQuadrant.com PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services -- Sent via pgsql-general mailing list (pgsql-general@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-general
