Hello:
Thank you all for kindly replying my question. I read the documentation about pg_basebackup. The description says: The server must also be configured with max_wal_senders set high enough to leave at least one session available for the backup. Dose it mean: If I am building a one master -- one slave environment, I need the max_wal_sender to be at least 2. But I think pg_basebackup just use the one sender process temporarily, Is that right? Best Regards 2013/10/7 Adrian Klaver <adrian.kla...@gmail.com> > On 10/06/2013 09:53 PM, Amit Langote wrote: > >> Hi, >> >> On Mon, Oct 7, 2013 at 12:02 PM, 高健 <luckyjack...@gmail.com> wrote: >> >>> Hello : >>> >>> >>> I found that for PG9.2.4, there is parameter max_wal_senders, >>> >>> But there is no parameter of max_wal_receivers. >>> >>> >>> >> max_wal_senders is the maximum number of WAL sender processes that a >> primary server can create in response to requests from the standby >> servers. One WAL sender process is created on the primary server for >> each standby which would running the corresponding WAL receiver. So >> there is one-to-one mapping between WAL senders and WAL receivers >> (standbys). >> > > Just to add, pg_basebackup also counts against the total of receivers: > > http://www.postgresql.org/**docs/9.3/interactive/app-**pgbasebackup.html<http://www.postgresql.org/docs/9.3/interactive/app-pgbasebackup.html> > > > >> -- >> Amit Langote >> >> >> > > -- > Adrian Klaver > adrian.kla...@gmail.com >
