On 9/15/15 11:04 PM, Fujii Masao wrote: > If --slot option is specified, pg_receivexlog reports a flush position to > the server even though --synchronous is not specified. So users might think > that --synchrnous option is not necessary for synchronous pg_receivexlog > setting. But that's not true. If --synchronous option is not specified, the > received WAL data is flushed to the disk only when WAL segment is switched. > So the transactions on the master need to wait for a long time, i.e., > we can think that synchronous pg_receivexlog doesn't work smoothly. > To avoid such situation, --synchronous option also needs to be specified and > which makes pg_receivexlog flush WAL data immediately after receiving it.
Thank you for this information. I hope to have clarified this in the documentation now. -- Sent via pgsql-hackers mailing list (email@example.com) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-hackers